Tech ENABLE_TRANSFORMATIONS_BY_MATRICES - 1st installment. Geometry::Transformation modified to store data in a single matrix, without store the matrix components

Fixed conflicts during rebase with master

23 files changed, 9768 insertions, 9095 deletions

diff --git a/src/libslic3r/Geometry.cpp b/src/libslic3r/Geometry.cpp
index 58c90d9bc..fba1b2378 100644
--- a/src/libslic3r/Geometry.cpp
+++ b/src/libslic3r/Geometry.cpp
@@ -313,6 +313,34 @@ Transform3d assemble_transform(const Vec3d& translation, const Vec3d& rotation,
     return transform;
 }
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+void rotation_transform(Transform3d& transform, const Vec3d& rotation)
+{
+    transform = Transform3d::Identity();
+    transform.rotate(Eigen::AngleAxisd(rotation.z(), Vec3d::UnitZ()) * Eigen::AngleAxisd(rotation.y(), Vec3d::UnitY()) * Eigen::AngleAxisd(rotation.x(), Vec3d::UnitX()));
+}
+
+Transform3d rotation_transform(const Vec3d& rotation)
+{
+    Transform3d transform;
+    rotation_transform(transform, rotation);
+    return transform;
+}
+
+void scale_transform(Transform3d& transform, const Vec3d& scale)
+{
+    transform = Transform3d::Identity();
+    transform.scale(scale);
+}
+
+Transform3d scale_transform(const Vec3d& scale)
+{
+    Transform3d transform;
+    scale_transform(transform, scale);
+    return transform;
+}
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+
 Vec3d extract_euler_angles(const Eigen::Matrix<double, 3, 3, Eigen::DontAlign>& rotation_matrix)
 {
     // reference: http://eecs.qmul.ac.uk/~gslabaugh/publications/euler.pdf
@@ -363,6 +391,46 @@ Vec3d extract_euler_angles(const Transform3d& transform)
     return extract_euler_angles(m);
 }
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+Transform3d Transformation::get_offset_matrix() const
+{
+    return assemble_transform(get_offset());
+}
+
+static Transform3d extract_rotation(const Transform3d& trafo)
+{
+    Matrix3d rotation;
+    Matrix3d scale;
+    trafo.computeRotationScaling(&rotation, &scale);
+    return Transform3d(rotation);
+}
+
+static Transform3d extract_scale(const Transform3d& trafo)
+{
+    Matrix3d rotation;
+    Matrix3d scale;
+    trafo.computeRotationScaling(&rotation, &scale);
+    return Transform3d(scale);
+}
+
+static std::pair<Transform3d, Transform3d> extract_rotation_scale(const Transform3d& trafo)
+{
+    Matrix3d rotation;
+    Matrix3d scale;
+    trafo.computeRotationScaling(&rotation, &scale);
+    return { Transform3d(rotation), Transform3d(scale) };
+}
+
+Vec3d Transformation::get_rotation() const
+{
+    return extract_euler_angles(extract_rotation(m_matrix));
+}
+
+Transform3d Transformation::get_rotation_matrix() const
+{
+    return extract_rotation(m_matrix);
+}
+#else
 bool Transformation::Flags::needs_update(bool dont_translate, bool dont_rotate, bool dont_scale, bool dont_mirror) const
 {
     return (this->dont_translate != dont_translate) || (this->dont_rotate != dont_rotate) || (this->dont_scale != dont_scale) || (this->dont_mirror != dont_mirror);
@@ -400,12 +468,19 @@ void Transformation::set_offset(Axis axis, double offset)
         m_dirty = true;
     }
 }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
 void Transformation::set_rotation(const Vec3d& rotation)
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    const Vec3d offset = get_offset();
+    m_matrix = rotation_transform(rotation) * extract_scale(m_matrix);
+    m_matrix.translation() = offset;
+#else
     set_rotation(X, rotation.x());
     set_rotation(Y, rotation.y());
     set_rotation(Z, rotation.z());
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
 void Transformation::set_rotation(Axis axis, double rotation)
@@ -414,32 +489,106 @@ void Transformation::set_rotation(Axis axis, double rotation)
     if (is_approx(std::abs(rotation), 2.0 * double(PI)))
         rotation = 0.0;
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    auto [curr_rotation, scale] = extract_rotation_scale(m_matrix);
+    Vec3d angles = extract_euler_angles(curr_rotation);
+    angles[axis] = rotation;
+
+    const Vec3d offset = get_offset();
+    m_matrix = rotation_transform(angles) * scale;
+    m_matrix.translation() = offset;
+#else
     if (m_rotation(axis) != rotation) {
         m_rotation(axis) = rotation;
         m_dirty = true;
     }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+}
+
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+Vec3d Transformation::get_scaling_factor() const
+{
+    const Transform3d scale = extract_scale(m_matrix);
+    return { scale(0, 0), scale(1, 1), scale(2, 2) };
 }
 
+Transform3d Transformation::get_scaling_factor_matrix() const
+{
+    return extract_scale(m_matrix);
+}
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+
 void Transformation::set_scaling_factor(const Vec3d& scaling_factor)
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    assert(scaling_factor.x() > 0.0 && scaling_factor.y() > 0.0 && scaling_factor.z() > 0.0);
+
+    const Vec3d offset = get_offset();
+    m_matrix = extract_rotation(m_matrix) * scale_transform(scaling_factor);
+    m_matrix.translation() = offset;
+#else
     set_scaling_factor(X, scaling_factor.x());
     set_scaling_factor(Y, scaling_factor.y());
     set_scaling_factor(Z, scaling_factor.z());
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
 void Transformation::set_scaling_factor(Axis axis, double scaling_factor)
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    assert(scaling_factor > 0.0);
+    auto [rotation, scale] = extract_rotation_scale(m_matrix);
+    scale(axis, axis) = scaling_factor;
+
+    const Vec3d offset = get_offset();
+    m_matrix = rotation * scale;
+    m_matrix.translation() = offset;
+#else
     if (m_scaling_factor(axis) != std::abs(scaling_factor)) {
         m_scaling_factor(axis) = std::abs(scaling_factor);
         m_dirty = true;
     }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+Vec3d Transformation::get_mirror() const
+{
+    const Transform3d scale = extract_scale(m_matrix);
+    return { scale(0, 0) / std::abs(scale(0, 0)), scale(1, 1) / std::abs(scale(1, 1)), scale(2, 2) / std::abs(scale(2, 2)) };
+}
+
+Transform3d Transformation::get_mirror_matrix() const
+{
+    const Vec3d scale = get_scaling_factor();
+    return scale_transform({ scale.x() / std::abs(scale.x()), scale.y() / std::abs(scale.y()), scale.z() / std::abs(scale.z()) });
+}
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+
 void Transformation::set_mirror(const Vec3d& mirror)
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Vec3d copy(mirror);
+    const Vec3d abs_mirror = copy.cwiseAbs();
+    for (int i = 0; i < 3; ++i) {
+        if (abs_mirror(i) == 0.0)
+            copy(i) = 1.0;
+        else if (abs_mirror(i) != 1.0)
+            copy(i) /= abs_mirror(i);
+    }
+
+    const Vec3d curr_scale = get_scaling_factor();
+    const Vec3d signs = curr_scale.cwiseProduct(copy);
+    set_scaling_factor({
+        signs.x() < 0.0 ? std::abs(curr_scale.x()) * copy.x() : curr_scale.x(),
+        signs.y() < 0.0 ? std::abs(curr_scale.y()) * copy.y() : curr_scale.y(),
+        signs.z() < 0.0 ? std::abs(curr_scale.z()) * copy.z() : curr_scale.z()
+        });
+#else
     set_mirror(X, mirror.x());
     set_mirror(Y, mirror.y());
     set_mirror(Z, mirror.z());
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
 void Transformation::set_mirror(Axis axis, double mirror)
@@ -450,12 +599,19 @@ void Transformation::set_mirror(Axis axis, double mirror)
     else if (abs_mirror != 1.0)
         mirror /= abs_mirror;
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    const double curr_scale = get_scaling_factor(axis);
+    const double sign = curr_scale * mirror;
+    set_scaling_factor(axis, sign < 0.0 ? std::abs(curr_scale) * mirror : curr_scale);
+#else
     if (m_mirror(axis) != mirror) {
         m_mirror(axis) = mirror;
         m_dirty = true;
     }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
+#if !ENABLE_TRANSFORMATIONS_BY_MATRICES
 void Transformation::set_from_transform(const Transform3d& transform)
 {
     // offset
@@ -493,17 +649,38 @@ void Transformation::set_from_transform(const Transform3d& transform)
 //    if (!m_matrix.isApprox(transform))
 //        std::cout << "something went wrong in extracting data from matrix" << std::endl;
 }
+#endif // !ENABLE_TRANSFORMATIONS_BY_MATRICES
 
 void Transformation::reset()
 {
+#if !ENABLE_TRANSFORMATIONS_BY_MATRICES
     m_offset = Vec3d::Zero();
     m_rotation = Vec3d::Zero();
     m_scaling_factor = Vec3d::Ones();
     m_mirror = Vec3d::Ones();
+#endif // !ENABLE_TRANSFORMATIONS_BY_MATRICES
     m_matrix = Transform3d::Identity();
+#if !ENABLE_TRANSFORMATIONS_BY_MATRICES
     m_dirty = false;
+#endif // !ENABLE_TRANSFORMATIONS_BY_MATRICES
+}
+
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+Transform3d Transformation::get_matrix_no_offset() const
+{
+    Transformation copy(*this);
+    copy.reset_offset();
+    return copy.get_matrix();
 }
 
+Transform3d Transformation::get_matrix_no_scaling_factor() const
+{
+    Transformation copy(*this);
+    copy.reset_scaling_factor();
+    copy.reset_mirror();
+    return copy.get_matrix();
+}
+#else
 const Transform3d& Transformation::get_matrix(bool dont_translate, bool dont_rotate, bool dont_scale, bool dont_mirror) const
 {
     if (m_dirty || m_flags.needs_update(dont_translate, dont_rotate, dont_scale, dont_mirror)) {
@@ -520,6 +697,7 @@ const Transform3d& Transformation::get_matrix(bool dont_translate, bool dont_rot
 
     return m_matrix;
 }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
 Transformation Transformation::operator * (const Transformation& other) const
 {
@@ -533,7 +711,11 @@ Transformation Transformation::volume_to_bed_transformation(const Transformation
     if (instance_transformation.is_scaling_uniform()) {
         // No need to run the non-linear least squares fitting for uniform scaling.
         // Just set the inverse.
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        out = instance_transformation.get_matrix_no_offset().inverse();
+#else
         out.set_from_transform(instance_transformation.get_matrix(true).inverse());
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
     }
     else if (is_rotation_ninety_degrees(instance_transformation.get_rotation())) {
         // Anisotropic scaling, rotation by multiples of ninety degrees.
diff --git a/src/libslic3r/Geometry.hpp b/src/libslic3r/Geometry.hpp
index 2ca4ef884..ffe96cd3a 100644
--- a/src/libslic3r/Geometry.hpp
+++ b/src/libslic3r/Geometry.hpp
@@ -334,6 +334,26 @@ void assemble_transform(Transform3d& transform, const Vec3d& translation = Vec3d
 // 6) translate
 Transform3d assemble_transform(const Vec3d& translation = Vec3d::Zero(), const Vec3d& rotation = Vec3d::Zero(), const Vec3d& scale = Vec3d::Ones(), const Vec3d& mirror = Vec3d::Ones());
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+// Sets the given transform by assembling the given rotations in the following order:
+// 1) rotate X
+// 2) rotate Y
+// 3) rotate Z
+void rotation_transform(Transform3d& transform, const Vec3d& rotation);
+
+// Returns the transform obtained by assembling the given rotations in the following order:
+// 1) rotate X
+// 2) rotate Y
+// 3) rotate Z
+Transform3d rotation_transform(const Vec3d& rotation);
+
+// Sets the given transform by assembling the given scale factors
+void scale_transform(Transform3d& transform, const Vec3d& scale);
+
+// Returns the transform obtained by assembling the given scale factors
+Transform3d scale_transform(const Vec3d& scale);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+
 // Returns the euler angles extracted from the given rotation matrix
 // Warning -> The matrix should not contain any scale or shear !!!
 Vec3d extract_euler_angles(const Eigen::Matrix<double, 3, 3, Eigen::DontAlign>& rotation_matrix);
@@ -344,6 +364,9 @@ Vec3d extract_euler_angles(const Transform3d& transform);
 
 class Transformation
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Transform3d m_matrix{ Transform3d::Identity() };
+#else
     struct Flags
     {
         bool dont_translate{ true };
@@ -363,42 +386,104 @@ class Transformation
     mutable Transform3d m_matrix{ Transform3d::Identity() };
     mutable Flags m_flags;
     mutable bool m_dirty{ false };
+#endif // !ENABLE_TRANSFORMATIONS_BY_MATRICES
 
 public:
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Transformation() = default;
+    explicit Transformation(const Transform3d & transform) : m_matrix(transform) {}
+#else
     Transformation();
-    explicit Transformation(const Transform3d& transform);
+    explicit Transformation(const Transform3d & transform);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Transformation& operator = (const Transform3d& transform) { m_matrix = transform; return *this; }
+
+    Vec3d get_offset() const { return m_matrix.translation(); }
+    double get_offset(Axis axis) const { return get_offset()[axis]; }
 
+    Transform3d get_offset_matrix() const;
+
+    void set_offset(const Vec3d& offset) { m_matrix.translation() = offset; }
+    void set_offset(Axis axis, double offset) { m_matrix.translation()[axis] = offset; }
+#else
     const Vec3d& get_offset() const { return m_offset; }
     double get_offset(Axis axis) const { return m_offset(axis); }
 
     void set_offset(const Vec3d& offset);
     void set_offset(Axis axis, double offset);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Vec3d get_rotation() const;
+    double get_rotation(Axis axis) const { return get_rotation()[axis]; }
 
+    Transform3d get_rotation_matrix() const;
+#else
     const Vec3d& get_rotation() const { return m_rotation; }
     double get_rotation(Axis axis) const { return m_rotation(axis); }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     void set_rotation(const Vec3d& rotation);
     void set_rotation(Axis axis, double rotation);
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Vec3d get_scaling_factor() const;
+    double get_scaling_factor(Axis axis) const { return get_scaling_factor()[axis]; }
+
+    Transform3d get_scaling_factor_matrix() const;
+
+    bool is_scaling_uniform() const {
+        const Vec3d scale = get_scaling_factor();
+        return std::abs(scale.x() - scale.y()) < 1e-8 && std::abs(scale.x() - scale.z()) < 1e-8;
+    }
+#else
     const Vec3d& get_scaling_factor() const { return m_scaling_factor; }
     double get_scaling_factor(Axis axis) const { return m_scaling_factor(axis); }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     void set_scaling_factor(const Vec3d& scaling_factor);
     void set_scaling_factor(Axis axis, double scaling_factor);
+
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Vec3d get_mirror() const;
+    double get_mirror(Axis axis) const { return get_mirror()[axis]; }
+
+    Transform3d get_mirror_matrix() const;
+
+    bool is_left_handed() const {
+        const Vec3d mirror = get_mirror();
+        return mirror.x() * mirror.y() * mirror.z() < 0.0;
+    }
+#else
     bool is_scaling_uniform() const { return std::abs(m_scaling_factor.x() - m_scaling_factor.y()) < 1e-8 && std::abs(m_scaling_factor.x() - m_scaling_factor.z()) < 1e-8; }
 
     const Vec3d& get_mirror() const { return m_mirror; }
     double get_mirror(Axis axis) const { return m_mirror(axis); }
     bool is_left_handed() const { return m_mirror.x() * m_mirror.y() * m_mirror.z() < 0.; }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     void set_mirror(const Vec3d& mirror);
     void set_mirror(Axis axis, double mirror);
 
+#if !ENABLE_TRANSFORMATIONS_BY_MATRICES
     void set_from_transform(const Transform3d& transform);
+#endif // !ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     void reset();
-
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    void reset_offset() { set_offset(Vec3d::Zero()); }
+    void reset_rotation() { set_rotation(Vec3d::Zero()); }
+    void reset_scaling_factor() { set_scaling_factor(Vec3d::Ones()); }
+    void reset_mirror() { set_mirror(Vec3d::Ones()); }
+
+    const Transform3d& get_matrix() const { return m_matrix; }
+    Transform3d get_matrix_no_offset() const;
+    Transform3d get_matrix_no_scaling_factor() const;
+#else
     const Transform3d& get_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false, bool dont_mirror = false) const;
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     Transformation operator * (const Transformation& other) const;
 
@@ -408,15 +493,26 @@ public:
     static Transformation volume_to_bed_transformation(const Transformation& instance_transformation, const BoundingBoxf3& bbox);
 
 private:
-	friend class cereal::access;
-	template<class Archive> void serialize(Archive & ar) { ar(m_offset, m_rotation, m_scaling_factor, m_mirror); }
-	explicit Transformation(int) : m_dirty(true) {}
-	template <class Archive> static void load_and_construct(Archive &ar, cereal::construct<Transformation> &construct)
-	{
-		// Calling a private constructor with special "int" parameter to indicate that no construction is necessary.
-		construct(1);
-		ar(construct.ptr()->m_offset, construct.ptr()->m_rotation, construct.ptr()->m_scaling_factor, construct.ptr()->m_mirror);
-	}
+    friend class cereal::access;
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    template<class Archive> void serialize(Archive& ar) { ar(m_matrix); }
+    explicit Transformation(int) {}
+    template <class Archive> static void load_and_construct(Archive& ar, cereal::construct<Transformation>& construct)
+    {
+        // Calling a private constructor with special "int" parameter to indicate that no construction is necessary.
+        construct(1);
+        ar(construct.ptr()->m_matrix);
+    }
+#else
+    template<class Archive> void serialize(Archive& ar) { ar(m_offset, m_rotation, m_scaling_factor, m_mirror); }
+    explicit Transformation(int) : m_dirty(true) {}
+    template <class Archive> static void load_and_construct(Archive& ar, cereal::construct<Transformation>& construct)
+    {
+        // Calling a private constructor with special "int" parameter to indicate that no construction is necessary.
+        construct(1);
+        ar(construct.ptr()->m_offset, construct.ptr()->m_rotation, construct.ptr()->m_scaling_factor, construct.ptr()->m_mirror);
+    }
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 };
 
 // For parsing a transformation matrix from 3MF / AMF.
diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index 0f48f2bb2..7fb7ed9f1 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -945,7 +945,11 @@ const BoundingBoxf3& ModelObject::raw_bounding_box() const
         if (this->instances.empty())
             throw Slic3r::InvalidArgument("Can't call raw_bounding_box() with no instances");
 
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        const Transform3d inst_matrix = this->instances.front()->get_transformation().get_matrix_no_offset();
+#else
         const Transform3d& inst_matrix = this->instances.front()->get_transformation().get_matrix(true);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
         for (const ModelVolume *v : this->volumes)
             if (v->is_model_part())
                 m_raw_bounding_box.merge(v->mesh().transformed_bounding_box(inst_matrix * v->get_matrix()));
@@ -957,9 +961,15 @@ const BoundingBoxf3& ModelObject::raw_bounding_box() const
 BoundingBoxf3 ModelObject::instance_bounding_box(size_t instance_idx, bool dont_translate) const
 {
     BoundingBoxf3 bb;
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    const Transform3d inst_matrix = dont_translate ? 
+        this->instances[instance_idx]->get_transformation().get_matrix_no_offset() :
+        this->instances[instance_idx]->get_transformation().get_matrix();
+
+#else
     const Transform3d& inst_matrix = this->instances[instance_idx]->get_transformation().get_matrix(dont_translate);
-    for (ModelVolume *v : this->volumes)
-    {
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+    for (ModelVolume *v : this->volumes) {
         if (v->is_model_part())
             bb.merge(v->mesh().transformed_bounding_box(inst_matrix * v->get_matrix()));
     }
@@ -1368,9 +1378,12 @@ void ModelObject::split(ModelObjectPtrs* new_objects)
                 new_object->add_instance(*model_instance);
             ModelVolume* new_vol = new_object->add_volume(*volume, std::move(mesh));
 
-            for (ModelInstance* model_instance : new_object->instances)
-            {
+            for (ModelInstance* model_instance : new_object->instances) {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+                Vec3d shift = model_instance->get_transformation().get_matrix_no_offset() * new_vol->get_offset();
+#else
                 Vec3d shift = model_instance->get_transformation().get_matrix(true) * new_vol->get_offset();
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
                 model_instance->set_offset(model_instance->get_offset() + shift);
             }
 
@@ -1434,8 +1447,18 @@ void ModelObject::bake_xy_rotation_into_meshes(size_t instance_idx)
 
     // Adjust the meshes.
     // Transformation to be applied to the meshes.
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Geometry::Transformation reference_trafo_mod = reference_trafo;
+    reference_trafo_mod.reset_offset();
+    if (uniform_scaling)
+        reference_trafo_mod.reset_scaling_factor();
+    if (!has_mirrorring)
+        reference_trafo_mod.reset_mirror();
+    Eigen::Matrix3d mesh_trafo_3x3 = reference_trafo_mod.get_matrix().matrix().block<3, 3>(0, 0);
+#else
     Eigen::Matrix3d mesh_trafo_3x3           = reference_trafo.get_matrix(true, false, uniform_scaling, ! has_mirrorring).matrix().block<3, 3>(0, 0);
-	Transform3d     volume_offset_correction = this->instances[instance_idx]->get_transformation().get_matrix().inverse() * reference_trafo.get_matrix();
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+    Transform3d     volume_offset_correction = this->instances[instance_idx]->get_transformation().get_matrix().inverse() * reference_trafo.get_matrix();
     for (ModelVolume *model_volume : this->volumes) {
         const Geometry::Transformation volume_trafo = model_volume->get_transformation();
         bool   volume_left_handed        = volume_trafo.is_left_handed();
@@ -1444,7 +1467,17 @@ void ModelObject::bake_xy_rotation_into_meshes(size_t instance_idx)
                                            std::abs(volume_trafo.get_scaling_factor().x() - volume_trafo.get_scaling_factor().z()) < EPSILON;
         double volume_new_scaling_factor = volume_uniform_scaling ? volume_trafo.get_scaling_factor().x() : 1.;
         // Transform the mesh.
-		Matrix3d volume_trafo_3x3 = volume_trafo.get_matrix(true, false, volume_uniform_scaling, !volume_has_mirrorring).matrix().block<3, 3>(0, 0);
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        Geometry::Transformation volume_trafo_mod = volume_trafo;
+        volume_trafo_mod.reset_offset();
+        if (volume_uniform_scaling)
+            volume_trafo_mod.reset_scaling_factor();
+        if (!volume_has_mirrorring)
+            volume_trafo_mod.reset_mirror();
+        Eigen::Matrix3d volume_trafo_3x3 = volume_trafo_mod.get_matrix().matrix().block<3, 3>(0, 0);
+#else
+        Matrix3d volume_trafo_3x3 = volume_trafo.get_matrix(true, false, volume_uniform_scaling, !volume_has_mirrorring).matrix().block<3, 3>(0, 0);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
         // Following method creates a new shared_ptr<TriangleMesh>
 		model_volume->transform_this_mesh(mesh_trafo_3x3 * volume_trafo_3x3, left_handed != volume_left_handed);
         // Reset the rotation, scaling and mirroring.
@@ -1491,7 +1524,11 @@ double ModelObject::get_instance_min_z(size_t instance_idx) const
     double min_z = DBL_MAX;
 
     const ModelInstance* inst = instances[instance_idx];
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    const Transform3d& mi = inst->get_matrix_no_offset();
+#else
     const Transform3d& mi = inst->get_matrix(true);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     for (const ModelVolume* v : volumes) {
         if (!v->is_model_part())
@@ -1512,7 +1549,11 @@ double ModelObject::get_instance_max_z(size_t instance_idx) const
     double max_z = -DBL_MAX;
 
     const ModelInstance* inst = instances[instance_idx];
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    const Transform3d& mi = inst->get_matrix_no_offset();
+#else
     const Transform3d& mi = inst->get_matrix(true);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     for (const ModelVolume* v : volumes) {
         if (!v->is_model_part())
@@ -1938,14 +1979,22 @@ void ModelVolume::convert_from_meters()
 
 void ModelInstance::transform_mesh(TriangleMesh* mesh, bool dont_translate) const
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    mesh->transform(dont_translate ? get_matrix_no_offset() : get_matrix());
+#else
     mesh->transform(get_matrix(dont_translate));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
 BoundingBoxf3 ModelInstance::transform_mesh_bounding_box(const TriangleMesh& mesh, bool dont_translate) const
 {
     // Rotate around mesh origin.
     TriangleMesh copy(mesh);
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    copy.transform(get_transformation().get_rotation_matrix());
+#else
     copy.transform(get_matrix(true, false, true, true));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
     BoundingBoxf3 bbox = copy.bounding_box();
 
     if (!empty(bbox)) {
@@ -1970,12 +2019,20 @@ BoundingBoxf3 ModelInstance::transform_mesh_bounding_box(const TriangleMesh& mes
 
 BoundingBoxf3 ModelInstance::transform_bounding_box(const BoundingBoxf3 &bbox, bool dont_translate) const
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    return bbox.transformed(dont_translate ? get_matrix_no_offset() : get_matrix());
+#else
     return bbox.transformed(get_matrix(dont_translate));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
 Vec3d ModelInstance::transform_vector(const Vec3d& v, bool dont_translate) const
 {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    return dont_translate ? get_matrix_no_offset() * v : get_matrix() * v;
+#else
     return get_matrix(dont_translate) * v;
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 }
 
 void ModelInstance::transform_polygon(Polygon* polygon) const
diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index 0c95d98c0..f2844abcb 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -1,1212 +1,1254 @@
-#ifndef slic3r_Model_hpp_
-#define slic3r_Model_hpp_
-
-#include "libslic3r.h"
-#include "enum_bitmask.hpp"
-#include "Geometry.hpp"
-#include "ObjectID.hpp"
-#include "Point.hpp"
-#include "PrintConfig.hpp"
-#include "Slicing.hpp"
-#include "SLA/SupportPoint.hpp"
-#include "SLA/Hollowing.hpp"
-#include "TriangleMesh.hpp"
-#include "Arrange.hpp"
-#include "CustomGCode.hpp"
-#include "enum_bitmask.hpp"
-
-#include <map>
-#include <memory>
-#include <string>
-#include <utility>
-#include <vector>
-
-namespace cereal {
-	class BinaryInputArchive;
-	class BinaryOutputArchive;
-	template <class T> void load_optional(BinaryInputArchive &ar, std::shared_ptr<const T> &ptr);
-	template <class T> void save_optional(BinaryOutputArchive &ar, const std::shared_ptr<const T> &ptr);
-	template <class T> void load_by_value(BinaryInputArchive &ar, T &obj);
-	template <class T> void save_by_value(BinaryOutputArchive &ar, const T &obj);
-}
-
-namespace Slic3r {
-enum class ConversionType;
-
-class BuildVolume;
-class Model;
-class ModelInstance;
-class ModelMaterial;
-class ModelObject;
-class ModelVolume;
-class ModelWipeTower;
-class Print;
-class SLAPrint;
-class TriangleSelector;
-
-namespace UndoRedo {
-	class StackImpl;
-}
-
-class ModelConfigObject : public ObjectBase, public ModelConfig
-{
-private:
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	friend class ModelObject;
-	friend class ModelVolume;
-	friend class ModelMaterial;
-
-    // Constructors to be only called by derived classes.
-    // Default constructor to assign a unique ID.
-    explicit ModelConfigObject() = default;
-    // Constructor with ignored int parameter to assign an invalid ID, to be replaced
-    // by an existing ID copied from elsewhere.
-    explicit ModelConfigObject(int) : ObjectBase(-1) {}
-    // Copy constructor copies the ID.
-	explicit ModelConfigObject(const ModelConfigObject &cfg) = default;
-    // Move constructor copies the ID.
-	explicit ModelConfigObject(ModelConfigObject &&cfg) = default;
-
-    Timestamp          timestamp() const throw() override { return this->ModelConfig::timestamp(); }
-    bool               object_id_and_timestamp_match(const ModelConfigObject &rhs) const throw() { return this->id() == rhs.id() && this->timestamp() == rhs.timestamp(); }
-
-    // called by ModelObject::assign_copy()
-	ModelConfigObject& operator=(const ModelConfigObject &rhs) = default;
-    ModelConfigObject& operator=(ModelConfigObject &&rhs) = default;
-
-    template<class Archive> void serialize(Archive &ar) {
-        ar(cereal::base_class<ModelConfig>(this));
-    }
-};
-
-namespace Internal {
-	template<typename T>
-	class StaticSerializationWrapper
-	{
-	public:
-		StaticSerializationWrapper(T &wrap) : wrapped(wrap) {}
-	private:
-		friend class cereal::access;
-		friend class UndoRedo::StackImpl;
-		template<class Archive> void load(Archive &ar) { cereal::load_by_value(ar, wrapped); }
-		template<class Archive> void save(Archive &ar) const { cereal::save_by_value(ar, wrapped); }
-		T&	wrapped;
-	};
-}
-
-typedef std::string t_model_material_id;
-typedef std::string t_model_material_attribute;
-typedef std::map<t_model_material_attribute, std::string> t_model_material_attributes;
-
-typedef std::map<t_model_material_id, ModelMaterial*> ModelMaterialMap;
-typedef std::vector<ModelObject*> ModelObjectPtrs;
-typedef std::vector<ModelVolume*> ModelVolumePtrs;
-typedef std::vector<ModelInstance*> ModelInstancePtrs;
-
-#define OBJECTBASE_DERIVED_COPY_MOVE_CLONE(TYPE) \
-    /* Copy a model, copy the IDs. The Print::apply() will call the TYPE::copy() method */ \
-    /* to make a private copy for background processing. */ \
-    static TYPE* new_copy(const TYPE &rhs)  { auto *ret = new TYPE(rhs); assert(ret->id() == rhs.id()); return ret; } \
-    static TYPE* new_copy(TYPE &&rhs)       { auto *ret = new TYPE(std::move(rhs)); assert(ret->id() == rhs.id()); return ret; } \
-    static TYPE  make_copy(const TYPE &rhs) { TYPE ret(rhs); assert(ret.id() == rhs.id()); return ret; } \
-    static TYPE  make_copy(TYPE &&rhs)      { TYPE ret(std::move(rhs)); assert(ret.id() == rhs.id()); return ret; } \
-    TYPE&        assign_copy(const TYPE &rhs); \
-    TYPE&        assign_copy(TYPE &&rhs); \
-    /* Copy a TYPE, generate new IDs. The front end will use this call. */ \
-    static TYPE* new_clone(const TYPE &rhs) { \
-        /* Default constructor assigning an invalid ID. */ \
-        auto obj = new TYPE(-1); \
-        obj->assign_clone(rhs); \
-        assert(obj->id().valid() && obj->id() != rhs.id()); \
-        return obj; \
-	} \
-    TYPE         make_clone(const TYPE &rhs) { \
-        /* Default constructor assigning an invalid ID. */ \
-        TYPE obj(-1); \
-        obj.assign_clone(rhs); \
-        assert(obj.id().valid() && obj.id() != rhs.id()); \
-        return obj; \
-    } \
-    TYPE&        assign_clone(const TYPE &rhs) { \
-        this->assign_copy(rhs); \
-        assert(this->id().valid() && this->id() == rhs.id()); \
-        this->assign_new_unique_ids_recursive(); \
-        assert(this->id().valid() && this->id() != rhs.id()); \
-		return *this; \
-    }
-
-// Material, which may be shared across multiple ModelObjects of a single Model.
-class ModelMaterial final : public ObjectBase
-{
-public:
-    // Attributes are defined by the AMF file format, but they don't seem to be used by Slic3r for any purpose.
-    t_model_material_attributes attributes;
-    // Dynamic configuration storage for the object specific configuration values, overriding the global configuration.
-    ModelConfigObject config;
-
-    Model* get_model() const { return m_model; }
-    void apply(const t_model_material_attributes &attributes)
-        { this->attributes.insert(attributes.begin(), attributes.end()); }
-
-private:
-    // Parent, owning this material.
-    Model *m_model;
-
-    // To be accessed by the Model.
-    friend class Model;
-	// Constructor, which assigns a new unique ID to the material and to its config.
-	ModelMaterial(Model *model) : m_model(model) { assert(this->id().valid()); }
-	// Copy constructor copies the IDs of the ModelMaterial and its config, and m_model!
-	ModelMaterial(const ModelMaterial &rhs) = default;
-	void set_model(Model *model) { m_model = model; }
-	void set_new_unique_id() { ObjectBase::set_new_unique_id(); this->config.set_new_unique_id(); }
-
-	// To be accessed by the serialization and Undo/Redo code.
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	// Create an object for deserialization, don't allocate IDs for ModelMaterial and its config.
-	ModelMaterial() : ObjectBase(-1), config(-1), m_model(nullptr) { assert(this->id().invalid()); assert(this->config.id().invalid()); }
-	template<class Archive> void serialize(Archive &ar) { 
-		assert(this->id().invalid()); assert(this->config.id().invalid());
-		Internal::StaticSerializationWrapper<ModelConfigObject> config_wrapper(config);
-		ar(attributes, config_wrapper);
-		// assert(this->id().valid()); assert(this->config.id().valid());
-	}
-
-	// Disabled methods.
-	ModelMaterial(ModelMaterial &&rhs) = delete;
-	ModelMaterial& operator=(const ModelMaterial &rhs) = delete;
-    ModelMaterial& operator=(ModelMaterial &&rhs) = delete;
-};
-
-class LayerHeightProfile final : public ObjectWithTimestamp {
-public:
-    // Assign the content if the timestamp differs, don't assign an ObjectID.
-    void assign(const LayerHeightProfile &rhs) { if (! this->timestamp_matches(rhs)) { m_data = rhs.m_data; this->copy_timestamp(rhs); } }
-    void assign(LayerHeightProfile &&rhs) { if (! this->timestamp_matches(rhs)) { m_data = std::move(rhs.m_data); this->copy_timestamp(rhs); } }
-
-    std::vector<coordf_t> get() const throw() { return m_data; }
-    bool                  empty() const throw() { return m_data.empty(); }
-    void                  set(const std::vector<coordf_t> &data) { if (m_data != data) { m_data = data; this->touch(); } }
-    void                  set(std::vector<coordf_t> &&data) { if (m_data != data) { m_data = std::move(data); this->touch(); } }
-    void                  clear() { m_data.clear(); this->touch(); }
-
-    template<class Archive> void serialize(Archive &ar)
-    {
-        ar(cereal::base_class<ObjectWithTimestamp>(this), m_data);
-    }
-
-private:
-    // Constructors to be only called by derived classes.
-    // Default constructor to assign a unique ID.
-    explicit LayerHeightProfile() = default;
-    // Constructor with ignored int parameter to assign an invalid ID, to be replaced
-    // by an existing ID copied from elsewhere.
-    explicit LayerHeightProfile(int) : ObjectWithTimestamp(-1) {}
-    // Copy constructor copies the ID.
-    explicit LayerHeightProfile(const LayerHeightProfile &rhs) = default;
-    // Move constructor copies the ID.
-    explicit LayerHeightProfile(LayerHeightProfile &&rhs) = default;
-
-    // called by ModelObject::assign_copy()
-    LayerHeightProfile& operator=(const LayerHeightProfile &rhs) = default;
-    LayerHeightProfile& operator=(LayerHeightProfile &&rhs) = default;
-
-    std::vector<coordf_t> m_data;
-
-    // to access set_new_unique_id() when copy / pasting an object
-    friend class ModelObject;
-};
-
-// Declared outside of ModelVolume, so it could be forward declared.
-enum class ModelVolumeType : int {
-    INVALID = -1,
-    MODEL_PART = 0,
-    NEGATIVE_VOLUME,
-    PARAMETER_MODIFIER,
-    SUPPORT_BLOCKER,
-    SUPPORT_ENFORCER,
-};
-
-enum class ModelObjectCutAttribute : int { KeepUpper, KeepLower, FlipLower }; 
-using ModelObjectCutAttributes = enum_bitmask<ModelObjectCutAttribute>;
-ENABLE_ENUM_BITMASK_OPERATORS(ModelObjectCutAttribute);
-
-// A printable object, possibly having multiple print volumes (each with its own set of parameters and materials),
-// and possibly having multiple modifier volumes, each modifier volume with its set of parameters and materials.
-// Each ModelObject may be instantiated mutliple times, each instance having different placement on the print bed,
-// different rotation and different uniform scaling.
-class ModelObject final : public ObjectBase
-{
-public:
-    std::string             name;
-    std::string             input_file;    // XXX: consider fs::path
-    // Instances of this ModelObject. Each instance defines a shift on the print bed, rotation around the Z axis and a uniform scaling.
-    // Instances are owned by this ModelObject.
-    ModelInstancePtrs       instances;
-    // Printable and modifier volumes, each with its material ID and a set of override parameters.
-    // ModelVolumes are owned by this ModelObject.
-    ModelVolumePtrs         volumes;
-    // Configuration parameters specific to a single ModelObject, overriding the global Slic3r settings.
-    ModelConfigObject 		config;
-    // Variation of a layer thickness for spans of Z coordinates + optional parameter overrides.
-    t_layer_config_ranges   layer_config_ranges;
-    // Profile of increasing z to a layer height, to be linearly interpolated when calculating the layers.
-    // The pairs of <z, layer_height> are packed into a 1D array.
-    LayerHeightProfile      layer_height_profile;
-    // Whether or not this object is printable
-    bool                    printable;
-
-    // This vector holds position of selected support points for SLA. The data are
-    // saved in mesh coordinates to allow using them for several instances.
-    // The format is (x, y, z, point_size, supports_island)
-    sla::SupportPoints      sla_support_points;
-    // To keep track of where the points came from (used for synchronization between
-    // the SLA gizmo and the backend).
-    sla::PointsStatus       sla_points_status = sla::PointsStatus::NoPoints;
-
-    // Holes to be drilled into the object so resin can flow out
-    sla::DrainHoles         sla_drain_holes;
-
-    /* This vector accumulates the total translation applied to the object by the
-        center_around_origin() method. Callers might want to apply the same translation
-        to new volumes before adding them to this object in order to preserve alignment
-        when user expects that. */
-    Vec3d                   origin_translation;
-
-    Model*                  get_model() { return m_model; }
-    const Model*            get_model() const { return m_model; }
-
-    ModelVolume*            add_volume(const TriangleMesh &mesh);
-    ModelVolume*            add_volume(TriangleMesh &&mesh, ModelVolumeType type = ModelVolumeType::MODEL_PART);
-    ModelVolume*            add_volume(const ModelVolume &volume, ModelVolumeType type = ModelVolumeType::INVALID);
-    ModelVolume*            add_volume(const ModelVolume &volume, TriangleMesh &&mesh);
-    void                    delete_volume(size_t idx);
-    void                    clear_volumes();
-    void                    sort_volumes(bool full_sort);
-    bool                    is_multiparts() const { return volumes.size() > 1; }
-    // Checks if any of object volume is painted using the fdm support painting gizmo.
-    bool                    is_fdm_support_painted() const;
-    // Checks if any of object volume is painted using the seam painting gizmo.
-    bool                    is_seam_painted() const;
-    // Checks if any of object volume is painted using the multi-material painting gizmo.
-    bool                    is_mm_painted() const;
-
-    ModelInstance*          add_instance();
-    ModelInstance*          add_instance(const ModelInstance &instance);
-    ModelInstance*          add_instance(const Vec3d &offset, const Vec3d &scaling_factor, const Vec3d &rotation, const Vec3d &mirror);
-    void                    delete_instance(size_t idx);
-    void                    delete_last_instance();
-    void                    clear_instances();
-
-    // Returns the bounding box of the transformed instances.
-    // This bounding box is approximate and not snug.
-    // This bounding box is being cached.
-    const BoundingBoxf3& bounding_box() const;
-    void invalidate_bounding_box() { m_bounding_box_valid = false; m_raw_bounding_box_valid = false; m_raw_mesh_bounding_box_valid = false; }
-
-    // A mesh containing all transformed instances of this object.
-    TriangleMesh mesh() const;
-    // Non-transformed (non-rotated, non-scaled, non-translated) sum of non-modifier object volumes.
-    // Currently used by ModelObject::mesh() and to calculate the 2D envelope for 2D plater.
-    TriangleMesh raw_mesh() const;
-    // The same as above, but producing a lightweight indexed_triangle_set.
-    indexed_triangle_set raw_indexed_triangle_set() const;
-    // A transformed snug bounding box around the non-modifier object volumes, without the translation applied.
-    // This bounding box is only used for the actual slicing.
-    const BoundingBoxf3& raw_bounding_box() const;
-    // A snug bounding box around the transformed non-modifier object volumes.
-    BoundingBoxf3 instance_bounding_box(size_t instance_idx, bool dont_translate = false) const;
-	// A snug bounding box of non-transformed (non-rotated, non-scaled, non-translated) sum of non-modifier object volumes.
-	const BoundingBoxf3& raw_mesh_bounding_box() const;
-	// A snug bounding box of non-transformed (non-rotated, non-scaled, non-translated) sum of all object volumes.
-    BoundingBoxf3 full_raw_mesh_bounding_box() const;
-
-    // Calculate 2D convex hull of of a projection of the transformed printable volumes into the XY plane.
-    // This method is cheap in that it does not make any unnecessary copy of the volume meshes.
-    // This method is used by the auto arrange function.
-    Polygon       convex_hull_2d(const Transform3d &trafo_instance) const;
-
-    void center_around_origin(bool include_modifiers = true);
-    void ensure_on_bed(bool allow_negative_z = false);
-
-    void translate_instances(const Vec3d& vector);
-    void translate_instance(size_t instance_idx, const Vec3d& vector);
-    void translate(const Vec3d &vector) { this->translate(vector(0), vector(1), vector(2)); }
-    void translate(double x, double y, double z);
-    void scale(const Vec3d &versor);
-    void scale(const double s) { this->scale(Vec3d(s, s, s)); }
-    void scale(double x, double y, double z) { this->scale(Vec3d(x, y, z)); }
-    /// Scale the current ModelObject to fit by altering the scaling factor of ModelInstances.
-    /// It operates on the total size by duplicating the object according to all the instances.
-    /// \param size Sizef3 the size vector
-    void scale_to_fit(const Vec3d &size);
-    void rotate(double angle, Axis axis);
-    void rotate(double angle, const Vec3d& axis);
-    void mirror(Axis axis);
-
-    // This method could only be called before the meshes of this ModelVolumes are not shared!
-    void scale_mesh_after_creation(const float scale);
-    void convert_units(ModelObjectPtrs&new_objects, ConversionType conv_type, std::vector<int> volume_idxs);
-
-    size_t materials_count() const;
-    size_t facets_count() const;
-    size_t parts_count() const;
-    ModelObjectPtrs cut(size_t instance, coordf_t z, ModelObjectCutAttributes attributes);
-    void split(ModelObjectPtrs* new_objects);
-    void merge();
-    // Support for non-uniform scaling of instances. If an instance is rotated by angles, which are not multiples of ninety degrees,
-    // then the scaling in world coordinate system is not representable by the Geometry::Transformation structure.
-    // This situation is solved by baking in the instance transformation into the mesh vertices.
-    // Rotation and mirroring is being baked in. In case the instance scaling was non-uniform, it is baked in as well.
-    void bake_xy_rotation_into_meshes(size_t instance_idx);
-
-    double get_min_z() const;
-    double get_max_z() const;
-    double get_instance_min_z(size_t instance_idx) const;
-    double get_instance_max_z(size_t instance_idx) const;
-
-    // Print object statistics to console.
-    void print_info() const;
-
-    std::string get_export_filename() const;
-
-    // Get full stl statistics for all object's meshes
-    TriangleMeshStats get_object_stl_stats() const;
-    // Get count of errors in the mesh( or all object's meshes, if volume index isn't defined)
-    int         get_repaired_errors_count(const int vol_idx = -1) const;
-
-private:
-    friend class Model;
-    // This constructor assigns new ID to this ModelObject and its config.
-    explicit ModelObject(Model* model) : m_model(model), printable(true), origin_translation(Vec3d::Zero()),
-        m_bounding_box_valid(false), m_raw_bounding_box_valid(false), m_raw_mesh_bounding_box_valid(false)
-    { 
-        assert(this->id().valid());
-        assert(this->config.id().valid());
-        assert(this->layer_height_profile.id().valid());
-    }
-    explicit ModelObject(int) : ObjectBase(-1), config(-1), layer_height_profile(-1), m_model(nullptr), printable(true), origin_translation(Vec3d::Zero()), m_bounding_box_valid(false), m_raw_bounding_box_valid(false), m_raw_mesh_bounding_box_valid(false)
-    { 
-        assert(this->id().invalid()); 
-        assert(this->config.id().invalid());
-        assert(this->layer_height_profile.id().invalid());
-    }
-	~ModelObject();
-	void assign_new_unique_ids_recursive() override;
-
-    // To be able to return an object from own copy / clone methods. Hopefully the compiler will do the "Copy elision"
-    // (Omits copy and move(since C++11) constructors, resulting in zero - copy pass - by - value semantics).
-    ModelObject(const ModelObject &rhs) : ObjectBase(-1), config(-1), layer_height_profile(-1), m_model(rhs.m_model) { 
-    	assert(this->id().invalid()); 
-        assert(this->config.id().invalid()); 
-        assert(this->layer_height_profile.id().invalid());
-        assert(rhs.id() != rhs.config.id());
-        assert(rhs.id() != rhs.layer_height_profile.id());
-    	this->assign_copy(rhs);
-    	assert(this->id().valid()); 
-        assert(this->config.id().valid()); 
-        assert(this->layer_height_profile.id().valid()); 
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->layer_height_profile.id());
-    	assert(this->id() == rhs.id()); 
-        assert(this->config.id() == rhs.config.id());
-        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());
-    }
-    explicit ModelObject(ModelObject &&rhs) : ObjectBase(-1), config(-1), layer_height_profile(-1) { 
-    	assert(this->id().invalid()); 
-        assert(this->config.id().invalid()); 
-        assert(this->layer_height_profile.id().invalid());
-        assert(rhs.id() != rhs.config.id());
-        assert(rhs.id() != rhs.layer_height_profile.id());
-    	this->assign_copy(std::move(rhs));
-    	assert(this->id().valid());
-        assert(this->config.id().valid());
-        assert(this->layer_height_profile.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->layer_height_profile.id());
-    	assert(this->id() == rhs.id());
-        assert(this->config.id() == rhs.config.id());
-        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());
-    }
-    ModelObject& operator=(const ModelObject &rhs) {
-    	this->assign_copy(rhs); 
-    	m_model = rhs.m_model;
-    	assert(this->id().valid()); 
-        assert(this->config.id().valid()); 
-        assert(this->layer_height_profile.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->layer_height_profile.id());
-    	assert(this->id() == rhs.id()); 
-        assert(this->config.id() == rhs.config.id());
-        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());
-    	return *this;
-    }
-    ModelObject& operator=(ModelObject &&rhs) {
-    	this->assign_copy(std::move(rhs)); 
-    	m_model = rhs.m_model;
-    	assert(this->id().valid()); 
-        assert(this->config.id().valid());
-        assert(this->layer_height_profile.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->layer_height_profile.id());
-    	assert(this->id() == rhs.id());
-        assert(this->config.id() == rhs.config.id());
-        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());
-    	return *this;
-    }
-	void set_new_unique_id() { 
-        ObjectBase::set_new_unique_id(); 
-        this->config.set_new_unique_id();
-        this->layer_height_profile.set_new_unique_id();
-    }
-
-    OBJECTBASE_DERIVED_COPY_MOVE_CLONE(ModelObject)
-
-    // Parent object, owning this ModelObject. Set to nullptr here, so the macros above will have it initialized.
-    Model                *m_model = nullptr;
-
-    // Bounding box, cached.
-    mutable BoundingBoxf3 m_bounding_box;
-    mutable bool          m_bounding_box_valid;
-    mutable BoundingBoxf3 m_raw_bounding_box;
-    mutable bool          m_raw_bounding_box_valid;
-    mutable BoundingBoxf3 m_raw_mesh_bounding_box;
-    mutable bool          m_raw_mesh_bounding_box_valid;
-
-    // Called by Print::apply() to set the model pointer after making a copy.
-    friend class Print;
-    friend class SLAPrint;
-    void        set_model(Model *model) { m_model = model; }
-
-    // Undo / Redo through the cereal serialization library
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	// Used for deserialization -> Don't allocate any IDs for the ModelObject or its config.
-	ModelObject() : 
-        ObjectBase(-1), config(-1), layer_height_profile(-1),
-        m_model(nullptr), m_bounding_box_valid(false), m_raw_bounding_box_valid(false), m_raw_mesh_bounding_box_valid(false) {
-		assert(this->id().invalid()); 
-        assert(this->config.id().invalid());
-        assert(this->layer_height_profile.id().invalid());
-	}
-	template<class Archive> void serialize(Archive &ar) {
-		ar(cereal::base_class<ObjectBase>(this));
-		Internal::StaticSerializationWrapper<ModelConfigObject> config_wrapper(config);
-        Internal::StaticSerializationWrapper<LayerHeightProfile> layer_heigth_profile_wrapper(layer_height_profile);
-        ar(name, input_file, instances, volumes, config_wrapper, layer_config_ranges, layer_heigth_profile_wrapper, 
-            sla_support_points, sla_points_status, sla_drain_holes, printable, origin_translation,
-            m_bounding_box, m_bounding_box_valid, m_raw_bounding_box, m_raw_bounding_box_valid, m_raw_mesh_bounding_box, m_raw_mesh_bounding_box_valid);
-	}
-
-    // Called by Print::validate() from the UI thread.
-    unsigned int update_instances_print_volume_state(const BuildVolume &build_volume);
-};
-
-enum class EnforcerBlockerType : int8_t {
-    // Maximum is 3. The value is serialized in TriangleSelector into 2 bits.
-    NONE      = 0,
-    ENFORCER  = 1,
-    BLOCKER   = 2,
-    // Maximum is 15. The value is serialized in TriangleSelector into 6 bits using a 2 bit prefix code.
-    Extruder1 = ENFORCER,
-    Extruder2 = BLOCKER,
-    Extruder3,
-    Extruder4,
-    Extruder5,
-    Extruder6,
-    Extruder7,
-    Extruder8,
-    Extruder9,
-    Extruder10,
-    Extruder11,
-    Extruder12,
-    Extruder13,
-    Extruder14,
-    Extruder15,
-};
-
-enum class ConversionType : int {
-    CONV_TO_INCH,
-    CONV_FROM_INCH,
-    CONV_TO_METER,
-    CONV_FROM_METER,
-};
-
-class FacetsAnnotation final : public ObjectWithTimestamp {
-public:
-    // Assign the content if the timestamp differs, don't assign an ObjectID.
-    void assign(const FacetsAnnotation& rhs) { if (! this->timestamp_matches(rhs)) { m_data = rhs.m_data; this->copy_timestamp(rhs); } }
-    void assign(FacetsAnnotation&& rhs) { if (! this->timestamp_matches(rhs)) { m_data = std::move(rhs.m_data); this->copy_timestamp(rhs); } }
-    const std::pair<std::vector<std::pair<int, int>>, std::vector<bool>>& get_data() const throw() { return m_data; }
-    bool set(const TriangleSelector& selector);
-    indexed_triangle_set get_facets(const ModelVolume& mv, EnforcerBlockerType type) const;
-    indexed_triangle_set get_facets_strict(const ModelVolume& mv, EnforcerBlockerType type) const;
-    bool has_facets(const ModelVolume& mv, EnforcerBlockerType type) const;
-    bool empty() const { return m_data.first.empty(); }
-
-    // Following method clears the config and increases its timestamp, so the deleted
-    // state is considered changed from perspective of the undo/redo stack.
-    void reset();
-
-    // Serialize triangle into string, for serialization into 3MF/AMF.
-    std::string get_triangle_as_string(int i) const;
-
-    // Before deserialization, reserve space for n_triangles.
-    void reserve(int n_triangles) { m_data.first.reserve(n_triangles); }
-    // Deserialize triangles one by one, with strictly increasing triangle_id.
-    void set_triangle_from_string(int triangle_id, const std::string& str);
-    // After deserializing the last triangle, shrink data to fit.
-    void shrink_to_fit() { m_data.first.shrink_to_fit(); m_data.second.shrink_to_fit(); }
-
-private:
-    // Constructors to be only called by derived classes.
-    // Default constructor to assign a unique ID.
-    explicit FacetsAnnotation() = default;
-    // Constructor with ignored int parameter to assign an invalid ID, to be replaced
-    // by an existing ID copied from elsewhere.
-    explicit FacetsAnnotation(int) : ObjectWithTimestamp(-1) {}
-    // Copy constructor copies the ID.
-    explicit FacetsAnnotation(const FacetsAnnotation &rhs) = default;
-    // Move constructor copies the ID.
-    explicit FacetsAnnotation(FacetsAnnotation &&rhs) = default;
-
-    // called by ModelVolume::assign_copy()
-    FacetsAnnotation& operator=(const FacetsAnnotation &rhs) = default;
-    FacetsAnnotation& operator=(FacetsAnnotation &&rhs) = default;
-
-    friend class cereal::access;
-    friend class UndoRedo::StackImpl;
-
-    template<class Archive> void serialize(Archive &ar)
-    {
-        ar(cereal::base_class<ObjectWithTimestamp>(this), m_data);
-    }
-
-    std::pair<std::vector<std::pair<int, int>>, std::vector<bool>> m_data;
-
-    // To access set_new_unique_id() when copy / pasting a ModelVolume.
-    friend class ModelVolume;
-};
-
-// An object STL, or a modifier volume, over which a different set of parameters shall be applied.
-// ModelVolume instances are owned by a ModelObject.
-class ModelVolume final : public ObjectBase
-{
-public:
-    std::string         name;
-    // struct used by reload from disk command to recover data from disk
-    struct Source
-    {
-        std::string input_file;
-        int object_idx{ -1 };
-        int volume_idx{ -1 };
-        Vec3d mesh_offset{ Vec3d::Zero() };
-        Geometry::Transformation transform;
-        bool is_converted_from_inches{ false };
-        bool is_converted_from_meters{ false };
-        bool is_from_builtin_objects{ false };
-
-        template<class Archive> void serialize(Archive& ar) { 
-            //FIXME Vojtech: Serialize / deserialize only if the Source is set.
-            // likely testing input_file or object_idx would be sufficient.
-            ar(input_file, object_idx, volume_idx, mesh_offset, transform, is_converted_from_inches, is_converted_from_meters, is_from_builtin_objects);
-        }
-    };
-    Source              source;
-
-    // The triangular model.
-    const TriangleMesh& mesh() const { return *m_mesh.get(); }
-    void                set_mesh(const TriangleMesh &mesh) { m_mesh = std::make_shared<const TriangleMesh>(mesh); }
-    void                set_mesh(TriangleMesh &&mesh) { m_mesh = std::make_shared<const TriangleMesh>(std::move(mesh)); }
-    void                set_mesh(const indexed_triangle_set &mesh) { m_mesh = std::make_shared<const TriangleMesh>(mesh); }
-    void                set_mesh(indexed_triangle_set &&mesh) { m_mesh = std::make_shared<const TriangleMesh>(std::move(mesh)); }
-    void                set_mesh(std::shared_ptr<const TriangleMesh> &mesh) { m_mesh = mesh; }
-    void                set_mesh(std::unique_ptr<const TriangleMesh> &&mesh) { m_mesh = std::move(mesh); }
-	void				reset_mesh() { m_mesh = std::make_shared<const TriangleMesh>(); }
-    // Configuration parameters specific to an object model geometry or a modifier volume, 
-    // overriding the global Slic3r settings and the ModelObject settings.
-    ModelConfigObject	config;
-
-    // List of mesh facets to be supported/unsupported.
-    FacetsAnnotation    supported_facets;
-
-    // List of seam enforcers/blockers.
-    FacetsAnnotation    seam_facets;
-
-    // List of mesh facets painted for MMU segmentation.
-    FacetsAnnotation    mmu_segmentation_facets;
-
-    // A parent object owning this modifier volume.
-    ModelObject*        get_object() const { return this->object; }
-    ModelVolumeType     type() const { return m_type; }
-    void                set_type(const ModelVolumeType t) { m_type = t; }
-	bool                is_model_part()         const { return m_type == ModelVolumeType::MODEL_PART; }
-    bool                is_negative_volume()    const { return m_type == ModelVolumeType::NEGATIVE_VOLUME; }
-	bool                is_modifier()           const { return m_type == ModelVolumeType::PARAMETER_MODIFIER; }
-	bool                is_support_enforcer()   const { return m_type == ModelVolumeType::SUPPORT_ENFORCER; }
-	bool                is_support_blocker()    const { return m_type == ModelVolumeType::SUPPORT_BLOCKER; }
-	bool                is_support_modifier()   const { return m_type == ModelVolumeType::SUPPORT_BLOCKER || m_type == ModelVolumeType::SUPPORT_ENFORCER; }
-    t_model_material_id material_id() const { return m_material_id; }
-    void                set_material_id(t_model_material_id material_id);
-    ModelMaterial*      material() const;
-    void                set_material(t_model_material_id material_id, const ModelMaterial &material);
-    // Extract the current extruder ID based on this ModelVolume's config and the parent ModelObject's config.
-    // Extruder ID is only valid for FFF. Returns -1 for SLA or if the extruder ID is not applicable (support volumes).
-    int                 extruder_id() const;
-
-    bool                is_splittable() const;
-
-    // Split this volume, append the result to the object owning this volume.
-    // Return the number of volumes created from this one.
-    // This is useful to assign different materials to different volumes of an object.
-    size_t              split(unsigned int max_extruders);
-    void                translate(double x, double y, double z) { translate(Vec3d(x, y, z)); }
-    void                translate(const Vec3d& displacement);
-    void                scale(const Vec3d& scaling_factors);
-    void                scale(double x, double y, double z) { scale(Vec3d(x, y, z)); }
-    void                scale(double s) { scale(Vec3d(s, s, s)); }
-    void                rotate(double angle, Axis axis);
-    void                rotate(double angle, const Vec3d& axis);
-    void                mirror(Axis axis);
-
-    // This method could only be called before the meshes of this ModelVolumes are not shared!
-    void                scale_geometry_after_creation(const Vec3f &versor);
-    void                scale_geometry_after_creation(const float scale) { this->scale_geometry_after_creation(Vec3f(scale, scale, scale)); }
-
-    // Translates the mesh and the convex hull so that the origin of their vertices is in the center of this volume's bounding box.
-    // Attention! This method may only be called just after ModelVolume creation! It must not be called once the TriangleMesh of this ModelVolume is shared!
-    void                center_geometry_after_creation(bool update_source_offset = true);
-
-    void                calculate_convex_hull();
-    const TriangleMesh& get_convex_hull() const;
-    const std::shared_ptr<const TriangleMesh>& get_convex_hull_shared_ptr() const { return m_convex_hull; }
-    // Get count of errors in the mesh
-    int                 get_repaired_errors_count() const;
-
-    // Helpers for loading / storing into AMF / 3MF files.
-    static ModelVolumeType type_from_string(const std::string &s);
-    static std::string  type_to_string(const ModelVolumeType t);
-
-    const Geometry::Transformation& get_transformation() const { return m_transformation; }
-    void set_transformation(const Geometry::Transformation& transformation) { m_transformation = transformation; }
-    void set_transformation(const Transform3d &trafo) { m_transformation.set_from_transform(trafo); }
-
-    const Vec3d& get_offset() const { return m_transformation.get_offset(); }
-    double get_offset(Axis axis) const { return m_transformation.get_offset(axis); }
-
-    void set_offset(const Vec3d& offset) { m_transformation.set_offset(offset); }
-    void set_offset(Axis axis, double offset) { m_transformation.set_offset(axis, offset); }
-
-    const Vec3d& get_rotation() const { return m_transformation.get_rotation(); }
-    double get_rotation(Axis axis) const { return m_transformation.get_rotation(axis); }
-
-    void set_rotation(const Vec3d& rotation) { m_transformation.set_rotation(rotation); }
-    void set_rotation(Axis axis, double rotation) { m_transformation.set_rotation(axis, rotation); }
-
-    Vec3d get_scaling_factor() const { return m_transformation.get_scaling_factor(); }
-    double get_scaling_factor(Axis axis) const { return m_transformation.get_scaling_factor(axis); }
-
-    void set_scaling_factor(const Vec3d& scaling_factor) { m_transformation.set_scaling_factor(scaling_factor); }
-    void set_scaling_factor(Axis axis, double scaling_factor) { m_transformation.set_scaling_factor(axis, scaling_factor); }
-
-    const Vec3d& get_mirror() const { return m_transformation.get_mirror(); }
-    double get_mirror(Axis axis) const { return m_transformation.get_mirror(axis); }
-    bool is_left_handed() const { return m_transformation.is_left_handed(); }
-
-    void set_mirror(const Vec3d& mirror) { m_transformation.set_mirror(mirror); }
-    void set_mirror(Axis axis, double mirror) { m_transformation.set_mirror(axis, mirror); }
-    void convert_from_imperial_units();
-    void convert_from_meters();
-
-    const Transform3d& get_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false, bool dont_mirror = false) const { return m_transformation.get_matrix(dont_translate, dont_rotate, dont_scale, dont_mirror); }
-
-	void set_new_unique_id() { 
-        ObjectBase::set_new_unique_id();
-        this->config.set_new_unique_id();
-        this->supported_facets.set_new_unique_id();
-        this->seam_facets.set_new_unique_id();
-        this->mmu_segmentation_facets.set_new_unique_id();
-    }
-
-    bool is_fdm_support_painted() const { return !this->supported_facets.empty(); }
-    bool is_seam_painted() const { return !this->seam_facets.empty(); }
-    bool is_mm_painted() const { return !this->mmu_segmentation_facets.empty(); }
-
-protected:
-	friend class Print;
-    friend class SLAPrint;
-    friend class Model;
-	friend class ModelObject;
-    friend void model_volume_list_update_supports(ModelObject& model_object_dst, const ModelObject& model_object_new);
-
-	// Copies IDs of both the ModelVolume and its config.
-	explicit ModelVolume(const ModelVolume &rhs) = default;
-    void     set_model_object(ModelObject *model_object) { object = model_object; }
-	void 	 assign_new_unique_ids_recursive() override;
-    void     transform_this_mesh(const Transform3d& t, bool fix_left_handed);
-    void     transform_this_mesh(const Matrix3d& m, bool fix_left_handed);
-
-private:
-    // Parent object owning this ModelVolume.
-    ModelObject*                    	object;
-    // The triangular model.
-    std::shared_ptr<const TriangleMesh> m_mesh;
-    // Is it an object to be printed, or a modifier volume?
-    ModelVolumeType                 	m_type;
-    t_model_material_id             	m_material_id;
-    // The convex hull of this model's mesh.
-    std::shared_ptr<const TriangleMesh> m_convex_hull;
-    Geometry::Transformation        	m_transformation;
-
-    // flag to optimize the checking if the volume is splittable
-    //     -1   ->   is unknown value (before first cheking)
-    //      0   ->   is not splittable
-    //      1   ->   is splittable
-    mutable int               		m_is_splittable{ -1 };
-
-	ModelVolume(ModelObject *object, const TriangleMesh &mesh, ModelVolumeType type = ModelVolumeType::MODEL_PART) : m_mesh(new TriangleMesh(mesh)), m_type(type), object(object)
-    {
-		assert(this->id().valid()); 
-        assert(this->config.id().valid()); 
-        assert(this->supported_facets.id().valid()); 
-        assert(this->seam_facets.id().valid());
-        assert(this->mmu_segmentation_facets.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->supported_facets.id());
-        assert(this->id() != this->seam_facets.id());
-        assert(this->id() != this->mmu_segmentation_facets.id());
-        if (mesh.facets_count() > 1)
-            calculate_convex_hull();
-    }
-    ModelVolume(ModelObject *object, TriangleMesh &&mesh, TriangleMesh &&convex_hull, ModelVolumeType type = ModelVolumeType::MODEL_PART) :
-		m_mesh(new TriangleMesh(std::move(mesh))), m_convex_hull(new TriangleMesh(std::move(convex_hull))), m_type(type), object(object) {
-		assert(this->id().valid()); 
-        assert(this->config.id().valid());
-        assert(this->supported_facets.id().valid());
-        assert(this->seam_facets.id().valid());
-        assert(this->mmu_segmentation_facets.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->supported_facets.id());
-        assert(this->id() != this->seam_facets.id());
-        assert(this->id() != this->mmu_segmentation_facets.id());
-	}
-
-    // Copying an existing volume, therefore this volume will get a copy of the ID assigned.
-    ModelVolume(ModelObject *object, const ModelVolume &other) :
-        ObjectBase(other),
-        name(other.name), source(other.source), m_mesh(other.m_mesh), m_convex_hull(other.m_convex_hull),
-        config(other.config), m_type(other.m_type), object(object), m_transformation(other.m_transformation),
-        supported_facets(other.supported_facets), seam_facets(other.seam_facets), mmu_segmentation_facets(other.mmu_segmentation_facets)
-    {
-		assert(this->id().valid()); 
-        assert(this->config.id().valid()); 
-        assert(this->supported_facets.id().valid());
-        assert(this->seam_facets.id().valid());
-        assert(this->mmu_segmentation_facets.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->supported_facets.id());
-        assert(this->id() != this->seam_facets.id());
-        assert(this->id() != this->mmu_segmentation_facets.id());
-		assert(this->id() == other.id());
-        assert(this->config.id() == other.config.id());
-        assert(this->supported_facets.id() == other.supported_facets.id());
-        assert(this->seam_facets.id() == other.seam_facets.id());
-        assert(this->mmu_segmentation_facets.id() == other.mmu_segmentation_facets.id());
-        this->set_material_id(other.material_id());
-    }
-    // Providing a new mesh, therefore this volume will get a new unique ID assigned.
-    ModelVolume(ModelObject *object, const ModelVolume &other, TriangleMesh &&mesh) :
-        name(other.name), source(other.source), config(other.config), object(object), m_mesh(new TriangleMesh(std::move(mesh))), m_type(other.m_type), m_transformation(other.m_transformation)
-    {
-		assert(this->id().valid()); 
-        assert(this->config.id().valid()); 
-        assert(this->supported_facets.id().valid());
-        assert(this->seam_facets.id().valid());
-        assert(this->mmu_segmentation_facets.id().valid());
-        assert(this->id() != this->config.id());
-        assert(this->id() != this->supported_facets.id());
-        assert(this->id() != this->seam_facets.id());
-        assert(this->id() != this->mmu_segmentation_facets.id());
-		assert(this->id() != other.id());
-        assert(this->config.id() == other.config.id());
-        this->set_material_id(other.material_id());
-        this->config.set_new_unique_id();
-        if (m_mesh->facets_count() > 1)
-            calculate_convex_hull();
-		assert(this->config.id().valid()); 
-        assert(this->config.id() != other.config.id()); 
-        assert(this->supported_facets.id() != other.supported_facets.id());
-        assert(this->seam_facets.id() != other.seam_facets.id());
-        assert(this->mmu_segmentation_facets.id() != other.mmu_segmentation_facets.id());
-        assert(this->id() != this->config.id());
-        assert(this->supported_facets.empty());
-        assert(this->seam_facets.empty());
-        assert(this->mmu_segmentation_facets.empty());
-    }
-
-    ModelVolume& operator=(ModelVolume &rhs) = delete;
-
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	// Used for deserialization, therefore no IDs are allocated.
-	ModelVolume() : ObjectBase(-1), config(-1), supported_facets(-1), seam_facets(-1), mmu_segmentation_facets(-1), object(nullptr) {
-		assert(this->id().invalid());
-        assert(this->config.id().invalid());
-        assert(this->supported_facets.id().invalid());
-        assert(this->seam_facets.id().invalid());
-        assert(this->mmu_segmentation_facets.id().invalid());
-	}
-	template<class Archive> void load(Archive &ar) {
-		bool has_convex_hull;
-        ar(name, source, m_mesh, m_type, m_material_id, m_transformation, m_is_splittable, has_convex_hull);
-        cereal::load_by_value(ar, supported_facets);
-        cereal::load_by_value(ar, seam_facets);
-        cereal::load_by_value(ar, mmu_segmentation_facets);
-        cereal::load_by_value(ar, config);
-		assert(m_mesh);
-		if (has_convex_hull) {
-			cereal::load_optional(ar, m_convex_hull);
-			if (! m_convex_hull && ! m_mesh->empty())
-				// The convex hull was released from the Undo / Redo stack to conserve memory. Recalculate it.
-				this->calculate_convex_hull();
-		} else
-			m_convex_hull.reset();
-	}
-	template<class Archive> void save(Archive &ar) const {
-		bool has_convex_hull = m_convex_hull.get() != nullptr;
-        ar(name, source, m_mesh, m_type, m_material_id, m_transformation, m_is_splittable, has_convex_hull);
-        cereal::save_by_value(ar, supported_facets);
-        cereal::save_by_value(ar, seam_facets);
-        cereal::save_by_value(ar, mmu_segmentation_facets);
-        cereal::save_by_value(ar, config);
-		if (has_convex_hull)
-			cereal::save_optional(ar, m_convex_hull);
-	}
-};
-
-inline void model_volumes_sort_by_id(ModelVolumePtrs &model_volumes)
-{
-    std::sort(model_volumes.begin(), model_volumes.end(), [](const ModelVolume *l, const ModelVolume *r) { return l->id() < r->id(); });
-}
-
-inline const ModelVolume* model_volume_find_by_id(const ModelVolumePtrs &model_volumes, const ObjectID id)
-{
-    auto it = lower_bound_by_predicate(model_volumes.begin(), model_volumes.end(), [id](const ModelVolume *mv) { return mv->id() < id; });
-    return it != model_volumes.end() && (*it)->id() == id ? *it : nullptr;
-}
-
-enum ModelInstanceEPrintVolumeState : unsigned char
-{
-    ModelInstancePVS_Inside,
-    ModelInstancePVS_Partly_Outside,
-    ModelInstancePVS_Fully_Outside,
-    ModelInstanceNum_BedStates
-};
-
-// A single instance of a ModelObject.
-// Knows the affine transformation of an object.
-class ModelInstance final : public ObjectBase
-{
-private:
-    Geometry::Transformation m_transformation;
-
-public:
-    // flag showing the position of this instance with respect to the print volume (set by Print::validate() using ModelObject::check_instances_print_volume_state())
-    ModelInstanceEPrintVolumeState print_volume_state;
-    // Whether or not this instance is printable
-    bool printable;
-
-    ModelObject* get_object() const { return this->object; }
-
-    const Geometry::Transformation& get_transformation() const { return m_transformation; }
-    void set_transformation(const Geometry::Transformation& transformation) { m_transformation = transformation; }
-
-    const Vec3d& get_offset() const { return m_transformation.get_offset(); }
-    double get_offset(Axis axis) const { return m_transformation.get_offset(axis); }
-    
-    void set_offset(const Vec3d& offset) { m_transformation.set_offset(offset); }
-    void set_offset(Axis axis, double offset) { m_transformation.set_offset(axis, offset); }
-
-    const Vec3d& get_rotation() const { return m_transformation.get_rotation(); }
-    double get_rotation(Axis axis) const { return m_transformation.get_rotation(axis); }
-
-    void set_rotation(const Vec3d& rotation) { m_transformation.set_rotation(rotation); }
-    void set_rotation(Axis axis, double rotation) { m_transformation.set_rotation(axis, rotation); }
-
-    const Vec3d& get_scaling_factor() const { return m_transformation.get_scaling_factor(); }
-    double get_scaling_factor(Axis axis) const { return m_transformation.get_scaling_factor(axis); }
-
-    void set_scaling_factor(const Vec3d& scaling_factor) { m_transformation.set_scaling_factor(scaling_factor); }
-    void set_scaling_factor(Axis axis, double scaling_factor) { m_transformation.set_scaling_factor(axis, scaling_factor); }
-
-    const Vec3d& get_mirror() const { return m_transformation.get_mirror(); }
-    double get_mirror(Axis axis) const { return m_transformation.get_mirror(axis); }
-	bool is_left_handed() const { return m_transformation.is_left_handed(); }
-    
-    void set_mirror(const Vec3d& mirror) { m_transformation.set_mirror(mirror); }
-    void set_mirror(Axis axis, double mirror) { m_transformation.set_mirror(axis, mirror); }
-
-    // To be called on an external mesh
-    void transform_mesh(TriangleMesh* mesh, bool dont_translate = false) const;
-    // Calculate a bounding box of a transformed mesh. To be called on an external mesh.
-    BoundingBoxf3 transform_mesh_bounding_box(const TriangleMesh& mesh, bool dont_translate = false) const;
-    // Transform an external bounding box.
-    BoundingBoxf3 transform_bounding_box(const BoundingBoxf3 &bbox, bool dont_translate = false) const;
-    // Transform an external vector.
-    Vec3d transform_vector(const Vec3d& v, bool dont_translate = false) const;
-    // To be called on an external polygon. It does not translate the polygon, only rotates and scales.
-    void transform_polygon(Polygon* polygon) const;
-
-    const Transform3d& get_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false, bool dont_mirror = false) const { return m_transformation.get_matrix(dont_translate, dont_rotate, dont_scale, dont_mirror); }
-
-    bool is_printable() const { return object->printable && printable && (print_volume_state == ModelInstancePVS_Inside); }
-
-    // Getting the input polygon for arrange
-    arrangement::ArrangePolygon get_arrange_polygon() const;
-    
-    // Apply the arrange result on the ModelInstance
-    void apply_arrange_result(const Vec2d& offs, double rotation)
-    {
-        // write the transformation data into the model instance
-        set_rotation(Z, rotation);
-        set_offset(X, unscale<double>(offs(X)));
-        set_offset(Y, unscale<double>(offs(Y)));
-        this->object->invalidate_bounding_box();
-    }
-
-protected:
-    friend class Print;
-    friend class SLAPrint;
-    friend class Model;
-    friend class ModelObject;
-
-    explicit ModelInstance(const ModelInstance &rhs) = default;
-    void     set_model_object(ModelObject *model_object) { object = model_object; }
-
-private:
-    // Parent object, owning this instance.
-    ModelObject* object;
-
-    // Constructor, which assigns a new unique ID.
-    explicit ModelInstance(ModelObject* object) : print_volume_state(ModelInstancePVS_Inside), printable(true), object(object) { assert(this->id().valid()); }
-    // Constructor, which assigns a new unique ID.
-    explicit ModelInstance(ModelObject *object, const ModelInstance &other) :
-        m_transformation(other.m_transformation), print_volume_state(ModelInstancePVS_Inside), printable(other.printable), object(object) { assert(this->id().valid() && this->id() != other.id()); }
-
-    explicit ModelInstance(ModelInstance &&rhs) = delete;
-    ModelInstance& operator=(const ModelInstance &rhs) = delete;
-    ModelInstance& operator=(ModelInstance &&rhs) = delete;
-
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	// Used for deserialization, therefore no IDs are allocated.
-	ModelInstance() : ObjectBase(-1), object(nullptr) { assert(this->id().invalid()); }
-	template<class Archive> void serialize(Archive &ar) {
-        ar(m_transformation, print_volume_state, printable);
-    }
-};
-
-
-class ModelWipeTower final : public ObjectBase
-{
-public:
-	Vec2d		position;
-	double 		rotation;
-
-private:
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	friend class Model;
-
-    // Constructors to be only called by derived classes.
-    // Default constructor to assign a unique ID.
-    explicit ModelWipeTower() {}
-    // Constructor with ignored int parameter to assign an invalid ID, to be replaced
-    // by an existing ID copied from elsewhere.
-    explicit ModelWipeTower(int) : ObjectBase(-1) {}
-    // Copy constructor copies the ID.
-	explicit ModelWipeTower(const ModelWipeTower &cfg) = default;
-
-	// Disabled methods.
-	ModelWipeTower(ModelWipeTower &&rhs) = delete;
-	ModelWipeTower& operator=(const ModelWipeTower &rhs) = delete;
-    ModelWipeTower& operator=(ModelWipeTower &&rhs) = delete;
-
-    // For serialization / deserialization of ModelWipeTower composed into another class into the Undo / Redo stack as a separate object.
-    template<typename Archive> void serialize(Archive &ar) { ar(position, rotation); }
-};
-
-// The print bed content.
-// Description of a triangular model with multiple materials, multiple instances with various affine transformations
-// and with multiple modifier meshes.
-// A model groups multiple objects, each object having possibly multiple instances,
-// all objects may share mutliple materials.
-class Model final : public ObjectBase
-{
-public:
-    // Materials are owned by a model and referenced by objects through t_model_material_id.
-    // Single material may be shared by multiple models.
-    ModelMaterialMap    materials;
-    // Objects are owned by a model. Each model may have multiple instances, each instance having its own transformation (shift, scale, rotation).
-    ModelObjectPtrs     objects;
-    // Wipe tower object.
-    ModelWipeTower	    wipe_tower;
-
-    // Extensions for color print
-    CustomGCode::Info custom_gcode_per_print_z;
-    
-    // Default constructor assigns a new ID to the model.
-    Model() { assert(this->id().valid()); }
-    ~Model() { this->clear_objects(); this->clear_materials(); }
-
-    /* To be able to return an object from own copy / clone methods. Hopefully the compiler will do the "Copy elision" */
-    /* (Omits copy and move(since C++11) constructors, resulting in zero - copy pass - by - value semantics). */
-    Model(const Model &rhs) : ObjectBase(-1) { assert(this->id().invalid()); this->assign_copy(rhs); assert(this->id().valid()); assert(this->id() == rhs.id()); }
-    explicit Model(Model &&rhs) : ObjectBase(-1) { assert(this->id().invalid()); this->assign_copy(std::move(rhs)); assert(this->id().valid()); assert(this->id() == rhs.id()); }
-    Model& operator=(const Model &rhs) { this->assign_copy(rhs); assert(this->id().valid()); assert(this->id() == rhs.id()); return *this; }
-    Model& operator=(Model &&rhs) { this->assign_copy(std::move(rhs)); assert(this->id().valid()); assert(this->id() == rhs.id()); return *this; }
-
-    OBJECTBASE_DERIVED_COPY_MOVE_CLONE(Model)
-
-    enum class LoadAttribute : int {
-        AddDefaultInstances,
-        CheckVersion
-    };
-    using LoadAttributes = enum_bitmask<LoadAttribute>;
-
-    static Model read_from_file(
-        const std::string& input_file, 
-        DynamicPrintConfig* config = nullptr, ConfigSubstitutionContext* config_substitutions = nullptr,
-        LoadAttributes options = LoadAttribute::AddDefaultInstances);
-    static Model read_from_archive(
-        const std::string& input_file, 
-        DynamicPrintConfig* config, ConfigSubstitutionContext* config_substitutions,
-        LoadAttributes options = LoadAttribute::AddDefaultInstances);
-
-    // Add a new ModelObject to this Model, generate a new ID for this ModelObject.
-    ModelObject* add_object();
-    ModelObject* add_object(const char *name, const char *path, const TriangleMesh &mesh);
-    ModelObject* add_object(const char *name, const char *path, TriangleMesh &&mesh);
-    ModelObject* add_object(const ModelObject &other);
-    void         delete_object(size_t idx);
-    bool         delete_object(ObjectID id);
-    bool         delete_object(ModelObject* object);
-    void         clear_objects();
-
-    ModelMaterial* add_material(t_model_material_id material_id);
-    ModelMaterial* add_material(t_model_material_id material_id, const ModelMaterial &other);
-    ModelMaterial* get_material(t_model_material_id material_id) {
-        ModelMaterialMap::iterator i = this->materials.find(material_id);
-        return (i == this->materials.end()) ? nullptr : i->second;
-    }
-
-    void          delete_material(t_model_material_id material_id);
-    void          clear_materials();
-    bool          add_default_instances();
-    // Returns approximate axis aligned bounding box of this model
-    BoundingBoxf3 bounding_box() const;
-    // Set the print_volume_state of PrintObject::instances, 
-    // return total number of printable objects.
-    unsigned int  update_print_volume_state(const BuildVolume &build_volume);
-    // Returns true if any ModelObject was modified.
-    bool 		  center_instances_around_point(const Vec2d &point);
-    void 		  translate(coordf_t x, coordf_t y, coordf_t z) { for (ModelObject *o : this->objects) o->translate(x, y, z); }
-    TriangleMesh  mesh() const;
-    
-    // Croaks if the duplicated objects do not fit the print bed.
-    void duplicate_objects_grid(size_t x, size_t y, coordf_t dist);
-
-    bool 		  looks_like_multipart_object() const;
-    void 		  convert_multipart_object(unsigned int max_extruders);
-    bool          looks_like_imperial_units() const;
-    void          convert_from_imperial_units(bool only_small_volumes);
-    bool          looks_like_saved_in_meters() const;
-    void          convert_from_meters(bool only_small_volumes);
-    int           removed_objects_with_zero_volume();
-
-    // Ensures that the min z of the model is not negative
-    void 		  adjust_min_z();
-
-    void 		  print_info() const { for (const ModelObject *o : this->objects) o->print_info(); }
-
-    // Propose an output file name & path based on the first printable object's name and source input file's path.
-    std::string   propose_export_file_name_and_path() const;
-    // Propose an output path, replace extension. The new_extension shall contain the initial dot.
-    std::string   propose_export_file_name_and_path(const std::string &new_extension) const;
-
-    // Checks if any of objects is painted using the fdm support painting gizmo.
-    bool          is_fdm_support_painted() const;
-    // Checks if any of objects is painted using the seam painting gizmo.
-    bool          is_seam_painted() const;
-    // Checks if any of objects is painted using the multi-material painting gizmo.
-    bool          is_mm_painted() const;
-
-private:
-    explicit Model(int) : ObjectBase(-1) { assert(this->id().invalid()); }
-	void assign_new_unique_ids_recursive();
-	void update_links_bottom_up_recursive();
-
-	friend class cereal::access;
-	friend class UndoRedo::StackImpl;
-	template<class Archive> void serialize(Archive &ar) {
-		Internal::StaticSerializationWrapper<ModelWipeTower> wipe_tower_wrapper(wipe_tower);
-		ar(materials, objects, wipe_tower_wrapper);
-    }
-};
-
-ENABLE_ENUM_BITMASK_OPERATORS(Model::LoadAttribute)
-
-#undef OBJECTBASE_DERIVED_COPY_MOVE_CLONE
-#undef OBJECTBASE_DERIVED_PRIVATE_COPY_MOVE
-
-// Test whether the two models contain the same number of ModelObjects with the same set of IDs
-// ordered in the same order. In that case it is not necessary to kill the background processing.
-bool model_object_list_equal(const Model &model_old, const Model &model_new);
-
-// Test whether the new model is just an extension of the old model (new objects were added
-// to the end of the original list. In that case it is not necessary to kill the background processing.
-bool model_object_list_extended(const Model &model_old, const Model &model_new);
-
-// Test whether the new ModelObject contains a different set of volumes (or sorted in a different order)
-// than the old ModelObject.
-bool model_volume_list_changed(const ModelObject &model_object_old, const ModelObject &model_object_new, const ModelVolumeType type);
-bool model_volume_list_changed(const ModelObject &model_object_old, const ModelObject &model_object_new, const std::initializer_list<ModelVolumeType> &types);
-
-// Test whether the now ModelObject has newer custom supports data than the old one.
-// The function assumes that volumes list is synchronized.
-bool model_custom_supports_data_changed(const ModelObject& mo, const ModelObject& mo_new);
-
-// Test whether the now ModelObject has newer custom seam data than the old one.
-// The function assumes that volumes list is synchronized.
-bool model_custom_seam_data_changed(const ModelObject& mo, const ModelObject& mo_new);
-
-// Test whether the now ModelObject has newer MMU segmentation data than the old one.
-// The function assumes that volumes list is synchronized.
-extern bool model_mmu_segmentation_data_changed(const ModelObject& mo, const ModelObject& mo_new);
-
-// If the model has multi-part objects, then it is currently not supported by the SLA mode.
-// Either the model cannot be loaded, or a SLA printer has to be activated.
-bool model_has_multi_part_objects(const Model &model);
-// If the model has advanced features, then it cannot be processed in simple mode.
-bool model_has_advanced_features(const Model &model);
-
-#ifndef NDEBUG
-// Verify whether the IDs of Model / ModelObject / ModelVolume / ModelInstance / ModelMaterial are valid and unique.
-void check_model_ids_validity(const Model &model);
-void check_model_ids_equal(const Model &model1, const Model &model2);
-#endif /* NDEBUG */
-
-static const float SINKING_Z_THRESHOLD = -0.001f;
-static const double SINKING_MIN_Z_THRESHOLD = 0.05;
-
-} // namespace Slic3r
-
-namespace cereal
-{
-	template <class Archive> struct specialize<Archive, Slic3r::ModelVolume, cereal::specialization::member_load_save> {};
-	template <class Archive> struct specialize<Archive, Slic3r::ModelConfigObject, cereal::specialization::member_serialize> {};
-}
-
-#endif /* slic3r_Model_hpp_ */
+#ifndef slic3r_Model_hpp_

+#define slic3r_Model_hpp_

+

+#include "libslic3r.h"

+#include "enum_bitmask.hpp"

+#include "Geometry.hpp"

+#include "ObjectID.hpp"

+#include "Point.hpp"

+#include "PrintConfig.hpp"

+#include "Slicing.hpp"

+#include "SLA/SupportPoint.hpp"

+#include "SLA/Hollowing.hpp"

+#include "TriangleMesh.hpp"

+#include "Arrange.hpp"

+#include "CustomGCode.hpp"

+#include "enum_bitmask.hpp"

+

+#include <map>

+#include <memory>

+#include <string>

+#include <utility>

+#include <vector>

+

+namespace cereal {

+	class BinaryInputArchive;

+	class BinaryOutputArchive;

+	template <class T> void load_optional(BinaryInputArchive &ar, std::shared_ptr<const T> &ptr);

+	template <class T> void save_optional(BinaryOutputArchive &ar, const std::shared_ptr<const T> &ptr);

+	template <class T> void load_by_value(BinaryInputArchive &ar, T &obj);

+	template <class T> void save_by_value(BinaryOutputArchive &ar, const T &obj);

+}

+

+namespace Slic3r {

+enum class ConversionType;

+

+class BuildVolume;

+class Model;

+class ModelInstance;

+class ModelMaterial;

+class ModelObject;

+class ModelVolume;

+class ModelWipeTower;

+class Print;

+class SLAPrint;

+class TriangleSelector;

+

+namespace UndoRedo {

+	class StackImpl;

+}

+

+class ModelConfigObject : public ObjectBase, public ModelConfig

+{

+private:

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	friend class ModelObject;

+	friend class ModelVolume;

+	friend class ModelMaterial;

+

+    // Constructors to be only called by derived classes.

+    // Default constructor to assign a unique ID.

+    explicit ModelConfigObject() = default;

+    // Constructor with ignored int parameter to assign an invalid ID, to be replaced

+    // by an existing ID copied from elsewhere.

+    explicit ModelConfigObject(int) : ObjectBase(-1) {}

+    // Copy constructor copies the ID.

+	explicit ModelConfigObject(const ModelConfigObject &cfg) = default;

+    // Move constructor copies the ID.

+	explicit ModelConfigObject(ModelConfigObject &&cfg) = default;

+

+    Timestamp          timestamp() const throw() override { return this->ModelConfig::timestamp(); }

+    bool               object_id_and_timestamp_match(const ModelConfigObject &rhs) const throw() { return this->id() == rhs.id() && this->timestamp() == rhs.timestamp(); }

+

+    // called by ModelObject::assign_copy()

+	ModelConfigObject& operator=(const ModelConfigObject &rhs) = default;

+    ModelConfigObject& operator=(ModelConfigObject &&rhs) = default;

+

+    template<class Archive> void serialize(Archive &ar) {

+        ar(cereal::base_class<ModelConfig>(this));

+    }

+};

+

+namespace Internal {

+	template<typename T>

+	class StaticSerializationWrapper

+	{

+	public:

+		StaticSerializationWrapper(T &wrap) : wrapped(wrap) {}

+	private:

+		friend class cereal::access;

+		friend class UndoRedo::StackImpl;

+		template<class Archive> void load(Archive &ar) { cereal::load_by_value(ar, wrapped); }

+		template<class Archive> void save(Archive &ar) const { cereal::save_by_value(ar, wrapped); }

+		T&	wrapped;

+	};

+}

+

+typedef std::string t_model_material_id;

+typedef std::string t_model_material_attribute;

+typedef std::map<t_model_material_attribute, std::string> t_model_material_attributes;

+

+typedef std::map<t_model_material_id, ModelMaterial*> ModelMaterialMap;

+typedef std::vector<ModelObject*> ModelObjectPtrs;

+typedef std::vector<ModelVolume*> ModelVolumePtrs;

+typedef std::vector<ModelInstance*> ModelInstancePtrs;

+

+#define OBJECTBASE_DERIVED_COPY_MOVE_CLONE(TYPE) \

+    /* Copy a model, copy the IDs. The Print::apply() will call the TYPE::copy() method */ \

+    /* to make a private copy for background processing. */ \

+    static TYPE* new_copy(const TYPE &rhs)  { auto *ret = new TYPE(rhs); assert(ret->id() == rhs.id()); return ret; } \

+    static TYPE* new_copy(TYPE &&rhs)       { auto *ret = new TYPE(std::move(rhs)); assert(ret->id() == rhs.id()); return ret; } \

+    static TYPE  make_copy(const TYPE &rhs) { TYPE ret(rhs); assert(ret.id() == rhs.id()); return ret; } \

+    static TYPE  make_copy(TYPE &&rhs)      { TYPE ret(std::move(rhs)); assert(ret.id() == rhs.id()); return ret; } \

+    TYPE&        assign_copy(const TYPE &rhs); \

+    TYPE&        assign_copy(TYPE &&rhs); \

+    /* Copy a TYPE, generate new IDs. The front end will use this call. */ \

+    static TYPE* new_clone(const TYPE &rhs) { \

+        /* Default constructor assigning an invalid ID. */ \

+        auto obj = new TYPE(-1); \

+        obj->assign_clone(rhs); \

+        assert(obj->id().valid() && obj->id() != rhs.id()); \

+        return obj; \

+	} \

+    TYPE         make_clone(const TYPE &rhs) { \

+        /* Default constructor assigning an invalid ID. */ \

+        TYPE obj(-1); \

+        obj.assign_clone(rhs); \

+        assert(obj.id().valid() && obj.id() != rhs.id()); \

+        return obj; \

+    } \

+    TYPE&        assign_clone(const TYPE &rhs) { \

+        this->assign_copy(rhs); \

+        assert(this->id().valid() && this->id() == rhs.id()); \

+        this->assign_new_unique_ids_recursive(); \

+        assert(this->id().valid() && this->id() != rhs.id()); \

+		return *this; \

+    }

+

+// Material, which may be shared across multiple ModelObjects of a single Model.

+class ModelMaterial final : public ObjectBase

+{

+public:

+    // Attributes are defined by the AMF file format, but they don't seem to be used by Slic3r for any purpose.

+    t_model_material_attributes attributes;

+    // Dynamic configuration storage for the object specific configuration values, overriding the global configuration.

+    ModelConfigObject config;

+

+    Model* get_model() const { return m_model; }

+    void apply(const t_model_material_attributes &attributes)

+        { this->attributes.insert(attributes.begin(), attributes.end()); }

+

+private:

+    // Parent, owning this material.

+    Model *m_model;

+

+    // To be accessed by the Model.

+    friend class Model;

+	// Constructor, which assigns a new unique ID to the material and to its config.

+	ModelMaterial(Model *model) : m_model(model) { assert(this->id().valid()); }

+	// Copy constructor copies the IDs of the ModelMaterial and its config, and m_model!

+	ModelMaterial(const ModelMaterial &rhs) = default;

+	void set_model(Model *model) { m_model = model; }

+	void set_new_unique_id() { ObjectBase::set_new_unique_id(); this->config.set_new_unique_id(); }

+

+	// To be accessed by the serialization and Undo/Redo code.

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	// Create an object for deserialization, don't allocate IDs for ModelMaterial and its config.

+	ModelMaterial() : ObjectBase(-1), config(-1), m_model(nullptr) { assert(this->id().invalid()); assert(this->config.id().invalid()); }

+	template<class Archive> void serialize(Archive &ar) { 

+		assert(this->id().invalid()); assert(this->config.id().invalid());

+		Internal::StaticSerializationWrapper<ModelConfigObject> config_wrapper(config);

+		ar(attributes, config_wrapper);

+		// assert(this->id().valid()); assert(this->config.id().valid());

+	}

+

+	// Disabled methods.

+	ModelMaterial(ModelMaterial &&rhs) = delete;

+	ModelMaterial& operator=(const ModelMaterial &rhs) = delete;

+    ModelMaterial& operator=(ModelMaterial &&rhs) = delete;

+};

+

+class LayerHeightProfile final : public ObjectWithTimestamp {

+public:

+    // Assign the content if the timestamp differs, don't assign an ObjectID.

+    void assign(const LayerHeightProfile &rhs) { if (! this->timestamp_matches(rhs)) { m_data = rhs.m_data; this->copy_timestamp(rhs); } }

+    void assign(LayerHeightProfile &&rhs) { if (! this->timestamp_matches(rhs)) { m_data = std::move(rhs.m_data); this->copy_timestamp(rhs); } }

+

+    std::vector<coordf_t> get() const throw() { return m_data; }

+    bool                  empty() const throw() { return m_data.empty(); }

+    void                  set(const std::vector<coordf_t> &data) { if (m_data != data) { m_data = data; this->touch(); } }

+    void                  set(std::vector<coordf_t> &&data) { if (m_data != data) { m_data = std::move(data); this->touch(); } }

+    void                  clear() { m_data.clear(); this->touch(); }

+

+    template<class Archive> void serialize(Archive &ar)

+    {

+        ar(cereal::base_class<ObjectWithTimestamp>(this), m_data);

+    }

+

+private:

+    // Constructors to be only called by derived classes.

+    // Default constructor to assign a unique ID.

+    explicit LayerHeightProfile() = default;

+    // Constructor with ignored int parameter to assign an invalid ID, to be replaced

+    // by an existing ID copied from elsewhere.

+    explicit LayerHeightProfile(int) : ObjectWithTimestamp(-1) {}

+    // Copy constructor copies the ID.

+    explicit LayerHeightProfile(const LayerHeightProfile &rhs) = default;

+    // Move constructor copies the ID.

+    explicit LayerHeightProfile(LayerHeightProfile &&rhs) = default;

+

+    // called by ModelObject::assign_copy()

+    LayerHeightProfile& operator=(const LayerHeightProfile &rhs) = default;

+    LayerHeightProfile& operator=(LayerHeightProfile &&rhs) = default;

+

+    std::vector<coordf_t> m_data;

+

+    // to access set_new_unique_id() when copy / pasting an object

+    friend class ModelObject;

+};

+

+// Declared outside of ModelVolume, so it could be forward declared.

+enum class ModelVolumeType : int {

+    INVALID = -1,

+    MODEL_PART = 0,

+    NEGATIVE_VOLUME,

+    PARAMETER_MODIFIER,

+    SUPPORT_BLOCKER,

+    SUPPORT_ENFORCER,

+};

+

+enum class ModelObjectCutAttribute : int { KeepUpper, KeepLower, FlipLower }; 

+using ModelObjectCutAttributes = enum_bitmask<ModelObjectCutAttribute>;

+ENABLE_ENUM_BITMASK_OPERATORS(ModelObjectCutAttribute);

+

+// A printable object, possibly having multiple print volumes (each with its own set of parameters and materials),

+// and possibly having multiple modifier volumes, each modifier volume with its set of parameters and materials.

+// Each ModelObject may be instantiated mutliple times, each instance having different placement on the print bed,

+// different rotation and different uniform scaling.

+class ModelObject final : public ObjectBase

+{

+public:

+    std::string             name;

+    std::string             input_file;    // XXX: consider fs::path

+    // Instances of this ModelObject. Each instance defines a shift on the print bed, rotation around the Z axis and a uniform scaling.

+    // Instances are owned by this ModelObject.

+    ModelInstancePtrs       instances;

+    // Printable and modifier volumes, each with its material ID and a set of override parameters.

+    // ModelVolumes are owned by this ModelObject.

+    ModelVolumePtrs         volumes;

+    // Configuration parameters specific to a single ModelObject, overriding the global Slic3r settings.

+    ModelConfigObject 		config;

+    // Variation of a layer thickness for spans of Z coordinates + optional parameter overrides.

+    t_layer_config_ranges   layer_config_ranges;

+    // Profile of increasing z to a layer height, to be linearly interpolated when calculating the layers.

+    // The pairs of <z, layer_height> are packed into a 1D array.

+    LayerHeightProfile      layer_height_profile;

+    // Whether or not this object is printable

+    bool                    printable;

+

+    // This vector holds position of selected support points for SLA. The data are

+    // saved in mesh coordinates to allow using them for several instances.

+    // The format is (x, y, z, point_size, supports_island)

+    sla::SupportPoints      sla_support_points;

+    // To keep track of where the points came from (used for synchronization between

+    // the SLA gizmo and the backend).

+    sla::PointsStatus       sla_points_status = sla::PointsStatus::NoPoints;

+

+    // Holes to be drilled into the object so resin can flow out

+    sla::DrainHoles         sla_drain_holes;

+

+    /* This vector accumulates the total translation applied to the object by the

+        center_around_origin() method. Callers might want to apply the same translation

+        to new volumes before adding them to this object in order to preserve alignment

+        when user expects that. */

+    Vec3d                   origin_translation;

+

+    Model*                  get_model() { return m_model; }

+    const Model*            get_model() const { return m_model; }

+

+    ModelVolume*            add_volume(const TriangleMesh &mesh);

+    ModelVolume*            add_volume(TriangleMesh &&mesh, ModelVolumeType type = ModelVolumeType::MODEL_PART);

+    ModelVolume*            add_volume(const ModelVolume &volume, ModelVolumeType type = ModelVolumeType::INVALID);

+    ModelVolume*            add_volume(const ModelVolume &volume, TriangleMesh &&mesh);

+    void                    delete_volume(size_t idx);

+    void                    clear_volumes();

+    void                    sort_volumes(bool full_sort);

+    bool                    is_multiparts() const { return volumes.size() > 1; }

+    // Checks if any of object volume is painted using the fdm support painting gizmo.

+    bool                    is_fdm_support_painted() const;

+    // Checks if any of object volume is painted using the seam painting gizmo.

+    bool                    is_seam_painted() const;

+    // Checks if any of object volume is painted using the multi-material painting gizmo.

+    bool                    is_mm_painted() const;

+

+    ModelInstance*          add_instance();

+    ModelInstance*          add_instance(const ModelInstance &instance);

+    ModelInstance*          add_instance(const Vec3d &offset, const Vec3d &scaling_factor, const Vec3d &rotation, const Vec3d &mirror);

+    void                    delete_instance(size_t idx);

+    void                    delete_last_instance();

+    void                    clear_instances();

+

+    // Returns the bounding box of the transformed instances.

+    // This bounding box is approximate and not snug.

+    // This bounding box is being cached.

+    const BoundingBoxf3& bounding_box() const;

+    void invalidate_bounding_box() { m_bounding_box_valid = false; m_raw_bounding_box_valid = false; m_raw_mesh_bounding_box_valid = false; }

+

+    // A mesh containing all transformed instances of this object.

+    TriangleMesh mesh() const;

+    // Non-transformed (non-rotated, non-scaled, non-translated) sum of non-modifier object volumes.

+    // Currently used by ModelObject::mesh() and to calculate the 2D envelope for 2D plater.

+    TriangleMesh raw_mesh() const;

+    // The same as above, but producing a lightweight indexed_triangle_set.

+    indexed_triangle_set raw_indexed_triangle_set() const;

+    // A transformed snug bounding box around the non-modifier object volumes, without the translation applied.

+    // This bounding box is only used for the actual slicing.

+    const BoundingBoxf3& raw_bounding_box() const;

+    // A snug bounding box around the transformed non-modifier object volumes.

+    BoundingBoxf3 instance_bounding_box(size_t instance_idx, bool dont_translate = false) const;

+	// A snug bounding box of non-transformed (non-rotated, non-scaled, non-translated) sum of non-modifier object volumes.

+	const BoundingBoxf3& raw_mesh_bounding_box() const;

+	// A snug bounding box of non-transformed (non-rotated, non-scaled, non-translated) sum of all object volumes.

+    BoundingBoxf3 full_raw_mesh_bounding_box() const;

+

+    // Calculate 2D convex hull of of a projection of the transformed printable volumes into the XY plane.

+    // This method is cheap in that it does not make any unnecessary copy of the volume meshes.

+    // This method is used by the auto arrange function.

+    Polygon       convex_hull_2d(const Transform3d &trafo_instance) const;

+

+    void center_around_origin(bool include_modifiers = true);

+    void ensure_on_bed(bool allow_negative_z = false);

+

+    void translate_instances(const Vec3d& vector);

+    void translate_instance(size_t instance_idx, const Vec3d& vector);

+    void translate(const Vec3d &vector) { this->translate(vector(0), vector(1), vector(2)); }

+    void translate(double x, double y, double z);

+    void scale(const Vec3d &versor);

+    void scale(const double s) { this->scale(Vec3d(s, s, s)); }

+    void scale(double x, double y, double z) { this->scale(Vec3d(x, y, z)); }

+    /// Scale the current ModelObject to fit by altering the scaling factor of ModelInstances.

+    /// It operates on the total size by duplicating the object according to all the instances.

+    /// \param size Sizef3 the size vector

+    void scale_to_fit(const Vec3d &size);

+    void rotate(double angle, Axis axis);

+    void rotate(double angle, const Vec3d& axis);

+    void mirror(Axis axis);

+

+    // This method could only be called before the meshes of this ModelVolumes are not shared!

+    void scale_mesh_after_creation(const float scale);

+    void convert_units(ModelObjectPtrs&new_objects, ConversionType conv_type, std::vector<int> volume_idxs);

+

+    size_t materials_count() const;

+    size_t facets_count() const;

+    size_t parts_count() const;

+    ModelObjectPtrs cut(size_t instance, coordf_t z, ModelObjectCutAttributes attributes);

+    void split(ModelObjectPtrs* new_objects);

+    void merge();

+    // Support for non-uniform scaling of instances. If an instance is rotated by angles, which are not multiples of ninety degrees,

+    // then the scaling in world coordinate system is not representable by the Geometry::Transformation structure.

+    // This situation is solved by baking in the instance transformation into the mesh vertices.

+    // Rotation and mirroring is being baked in. In case the instance scaling was non-uniform, it is baked in as well.

+    void bake_xy_rotation_into_meshes(size_t instance_idx);

+

+    double get_min_z() const;

+    double get_max_z() const;

+    double get_instance_min_z(size_t instance_idx) const;

+    double get_instance_max_z(size_t instance_idx) const;

+

+    // Print object statistics to console.

+    void print_info() const;

+

+    std::string get_export_filename() const;

+

+    // Get full stl statistics for all object's meshes

+    TriangleMeshStats get_object_stl_stats() const;

+    // Get count of errors in the mesh( or all object's meshes, if volume index isn't defined)

+    int         get_repaired_errors_count(const int vol_idx = -1) const;

+

+private:

+    friend class Model;

+    // This constructor assigns new ID to this ModelObject and its config.

+    explicit ModelObject(Model* model) : m_model(model), printable(true), origin_translation(Vec3d::Zero()),

+        m_bounding_box_valid(false), m_raw_bounding_box_valid(false), m_raw_mesh_bounding_box_valid(false)

+    { 

+        assert(this->id().valid());

+        assert(this->config.id().valid());

+        assert(this->layer_height_profile.id().valid());

+    }

+    explicit ModelObject(int) : ObjectBase(-1), config(-1), layer_height_profile(-1), m_model(nullptr), printable(true), origin_translation(Vec3d::Zero()), m_bounding_box_valid(false), m_raw_bounding_box_valid(false), m_raw_mesh_bounding_box_valid(false)

+    { 

+        assert(this->id().invalid()); 

+        assert(this->config.id().invalid());

+        assert(this->layer_height_profile.id().invalid());

+    }

+	~ModelObject();

+	void assign_new_unique_ids_recursive() override;

+

+    // To be able to return an object from own copy / clone methods. Hopefully the compiler will do the "Copy elision"

+    // (Omits copy and move(since C++11) constructors, resulting in zero - copy pass - by - value semantics).

+    ModelObject(const ModelObject &rhs) : ObjectBase(-1), config(-1), layer_height_profile(-1), m_model(rhs.m_model) { 

+    	assert(this->id().invalid()); 

+        assert(this->config.id().invalid()); 

+        assert(this->layer_height_profile.id().invalid());

+        assert(rhs.id() != rhs.config.id());

+        assert(rhs.id() != rhs.layer_height_profile.id());

+    	this->assign_copy(rhs);

+    	assert(this->id().valid()); 

+        assert(this->config.id().valid()); 

+        assert(this->layer_height_profile.id().valid()); 

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->layer_height_profile.id());

+    	assert(this->id() == rhs.id()); 

+        assert(this->config.id() == rhs.config.id());

+        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());

+    }

+    explicit ModelObject(ModelObject &&rhs) : ObjectBase(-1), config(-1), layer_height_profile(-1) { 

+    	assert(this->id().invalid()); 

+        assert(this->config.id().invalid()); 

+        assert(this->layer_height_profile.id().invalid());

+        assert(rhs.id() != rhs.config.id());

+        assert(rhs.id() != rhs.layer_height_profile.id());

+    	this->assign_copy(std::move(rhs));

+    	assert(this->id().valid());

+        assert(this->config.id().valid());

+        assert(this->layer_height_profile.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->layer_height_profile.id());

+    	assert(this->id() == rhs.id());

+        assert(this->config.id() == rhs.config.id());

+        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());

+    }

+    ModelObject& operator=(const ModelObject &rhs) {

+    	this->assign_copy(rhs); 

+    	m_model = rhs.m_model;

+    	assert(this->id().valid()); 

+        assert(this->config.id().valid()); 

+        assert(this->layer_height_profile.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->layer_height_profile.id());

+    	assert(this->id() == rhs.id()); 

+        assert(this->config.id() == rhs.config.id());

+        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());

+    	return *this;

+    }

+    ModelObject& operator=(ModelObject &&rhs) {

+    	this->assign_copy(std::move(rhs)); 

+    	m_model = rhs.m_model;

+    	assert(this->id().valid()); 

+        assert(this->config.id().valid());

+        assert(this->layer_height_profile.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->layer_height_profile.id());

+    	assert(this->id() == rhs.id());

+        assert(this->config.id() == rhs.config.id());

+        assert(this->layer_height_profile.id() == rhs.layer_height_profile.id());

+    	return *this;

+    }

+	void set_new_unique_id() { 

+        ObjectBase::set_new_unique_id(); 

+        this->config.set_new_unique_id();

+        this->layer_height_profile.set_new_unique_id();

+    }

+

+    OBJECTBASE_DERIVED_COPY_MOVE_CLONE(ModelObject)

+

+    // Parent object, owning this ModelObject. Set to nullptr here, so the macros above will have it initialized.

+    Model                *m_model = nullptr;

+

+    // Bounding box, cached.

+    mutable BoundingBoxf3 m_bounding_box;

+    mutable bool          m_bounding_box_valid;

+    mutable BoundingBoxf3 m_raw_bounding_box;

+    mutable bool          m_raw_bounding_box_valid;

+    mutable BoundingBoxf3 m_raw_mesh_bounding_box;

+    mutable bool          m_raw_mesh_bounding_box_valid;

+

+    // Called by Print::apply() to set the model pointer after making a copy.

+    friend class Print;

+    friend class SLAPrint;

+    void        set_model(Model *model) { m_model = model; }

+

+    // Undo / Redo through the cereal serialization library

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	// Used for deserialization -> Don't allocate any IDs for the ModelObject or its config.

+	ModelObject() : 

+        ObjectBase(-1), config(-1), layer_height_profile(-1),

+        m_model(nullptr), m_bounding_box_valid(false), m_raw_bounding_box_valid(false), m_raw_mesh_bounding_box_valid(false) {

+		assert(this->id().invalid()); 

+        assert(this->config.id().invalid());

+        assert(this->layer_height_profile.id().invalid());

+	}

+	template<class Archive> void serialize(Archive &ar) {

+		ar(cereal::base_class<ObjectBase>(this));

+		Internal::StaticSerializationWrapper<ModelConfigObject> config_wrapper(config);

+        Internal::StaticSerializationWrapper<LayerHeightProfile> layer_heigth_profile_wrapper(layer_height_profile);

+        ar(name, input_file, instances, volumes, config_wrapper, layer_config_ranges, layer_heigth_profile_wrapper, 

+            sla_support_points, sla_points_status, sla_drain_holes, printable, origin_translation,

+            m_bounding_box, m_bounding_box_valid, m_raw_bounding_box, m_raw_bounding_box_valid, m_raw_mesh_bounding_box, m_raw_mesh_bounding_box_valid);

+	}

+

+    // Called by Print::validate() from the UI thread.

+    unsigned int update_instances_print_volume_state(const BuildVolume &build_volume);

+};

+

+enum class EnforcerBlockerType : int8_t {

+    // Maximum is 3. The value is serialized in TriangleSelector into 2 bits.

+    NONE      = 0,

+    ENFORCER  = 1,

+    BLOCKER   = 2,

+    // Maximum is 15. The value is serialized in TriangleSelector into 6 bits using a 2 bit prefix code.

+    Extruder1 = ENFORCER,

+    Extruder2 = BLOCKER,

+    Extruder3,

+    Extruder4,

+    Extruder5,

+    Extruder6,

+    Extruder7,

+    Extruder8,

+    Extruder9,

+    Extruder10,

+    Extruder11,

+    Extruder12,

+    Extruder13,

+    Extruder14,

+    Extruder15,

+};

+

+enum class ConversionType : int {

+    CONV_TO_INCH,

+    CONV_FROM_INCH,

+    CONV_TO_METER,

+    CONV_FROM_METER,

+};

+

+class FacetsAnnotation final : public ObjectWithTimestamp {

+public:

+    // Assign the content if the timestamp differs, don't assign an ObjectID.

+    void assign(const FacetsAnnotation& rhs) { if (! this->timestamp_matches(rhs)) { m_data = rhs.m_data; this->copy_timestamp(rhs); } }

+    void assign(FacetsAnnotation&& rhs) { if (! this->timestamp_matches(rhs)) { m_data = std::move(rhs.m_data); this->copy_timestamp(rhs); } }

+    const std::pair<std::vector<std::pair<int, int>>, std::vector<bool>>& get_data() const throw() { return m_data; }

+    bool set(const TriangleSelector& selector);

+    indexed_triangle_set get_facets(const ModelVolume& mv, EnforcerBlockerType type) const;

+    indexed_triangle_set get_facets_strict(const ModelVolume& mv, EnforcerBlockerType type) const;

+    bool has_facets(const ModelVolume& mv, EnforcerBlockerType type) const;

+    bool empty() const { return m_data.first.empty(); }

+

+    // Following method clears the config and increases its timestamp, so the deleted

+    // state is considered changed from perspective of the undo/redo stack.

+    void reset();

+

+    // Serialize triangle into string, for serialization into 3MF/AMF.

+    std::string get_triangle_as_string(int i) const;

+

+    // Before deserialization, reserve space for n_triangles.

+    void reserve(int n_triangles) { m_data.first.reserve(n_triangles); }

+    // Deserialize triangles one by one, with strictly increasing triangle_id.

+    void set_triangle_from_string(int triangle_id, const std::string& str);

+    // After deserializing the last triangle, shrink data to fit.

+    void shrink_to_fit() { m_data.first.shrink_to_fit(); m_data.second.shrink_to_fit(); }

+

+private:

+    // Constructors to be only called by derived classes.

+    // Default constructor to assign a unique ID.

+    explicit FacetsAnnotation() = default;

+    // Constructor with ignored int parameter to assign an invalid ID, to be replaced

+    // by an existing ID copied from elsewhere.

+    explicit FacetsAnnotation(int) : ObjectWithTimestamp(-1) {}

+    // Copy constructor copies the ID.

+    explicit FacetsAnnotation(const FacetsAnnotation &rhs) = default;

+    // Move constructor copies the ID.

+    explicit FacetsAnnotation(FacetsAnnotation &&rhs) = default;

+

+    // called by ModelVolume::assign_copy()

+    FacetsAnnotation& operator=(const FacetsAnnotation &rhs) = default;

+    FacetsAnnotation& operator=(FacetsAnnotation &&rhs) = default;

+

+    friend class cereal::access;

+    friend class UndoRedo::StackImpl;

+

+    template<class Archive> void serialize(Archive &ar)

+    {

+        ar(cereal::base_class<ObjectWithTimestamp>(this), m_data);

+    }

+

+    std::pair<std::vector<std::pair<int, int>>, std::vector<bool>> m_data;

+

+    // To access set_new_unique_id() when copy / pasting a ModelVolume.

+    friend class ModelVolume;

+};

+

+// An object STL, or a modifier volume, over which a different set of parameters shall be applied.

+// ModelVolume instances are owned by a ModelObject.

+class ModelVolume final : public ObjectBase

+{

+public:

+    std::string         name;

+    // struct used by reload from disk command to recover data from disk

+    struct Source

+    {

+        std::string input_file;

+        int object_idx{ -1 };

+        int volume_idx{ -1 };

+        Vec3d mesh_offset{ Vec3d::Zero() };

+        Geometry::Transformation transform;

+        bool is_converted_from_inches{ false };

+        bool is_converted_from_meters{ false };

+        bool is_from_builtin_objects{ false };

+

+        template<class Archive> void serialize(Archive& ar) { 

+            //FIXME Vojtech: Serialize / deserialize only if the Source is set.

+            // likely testing input_file or object_idx would be sufficient.

+            ar(input_file, object_idx, volume_idx, mesh_offset, transform, is_converted_from_inches, is_converted_from_meters, is_from_builtin_objects);

+        }

+    };

+    Source              source;

+

+    // The triangular model.

+    const TriangleMesh& mesh() const { return *m_mesh.get(); }

+    void                set_mesh(const TriangleMesh &mesh) { m_mesh = std::make_shared<const TriangleMesh>(mesh); }

+    void                set_mesh(TriangleMesh &&mesh) { m_mesh = std::make_shared<const TriangleMesh>(std::move(mesh)); }

+    void                set_mesh(const indexed_triangle_set &mesh) { m_mesh = std::make_shared<const TriangleMesh>(mesh); }

+    void                set_mesh(indexed_triangle_set &&mesh) { m_mesh = std::make_shared<const TriangleMesh>(std::move(mesh)); }

+    void                set_mesh(std::shared_ptr<const TriangleMesh> &mesh) { m_mesh = mesh; }

+    void                set_mesh(std::unique_ptr<const TriangleMesh> &&mesh) { m_mesh = std::move(mesh); }

+	void				reset_mesh() { m_mesh = std::make_shared<const TriangleMesh>(); }

+    // Configuration parameters specific to an object model geometry or a modifier volume, 

+    // overriding the global Slic3r settings and the ModelObject settings.

+    ModelConfigObject	config;

+

+    // List of mesh facets to be supported/unsupported.

+    FacetsAnnotation    supported_facets;

+

+    // List of seam enforcers/blockers.

+    FacetsAnnotation    seam_facets;

+

+    // List of mesh facets painted for MMU segmentation.

+    FacetsAnnotation    mmu_segmentation_facets;

+

+    // A parent object owning this modifier volume.

+    ModelObject*        get_object() const { return this->object; }

+    ModelVolumeType     type() const { return m_type; }

+    void                set_type(const ModelVolumeType t) { m_type = t; }

+	bool                is_model_part()         const { return m_type == ModelVolumeType::MODEL_PART; }

+    bool                is_negative_volume()    const { return m_type == ModelVolumeType::NEGATIVE_VOLUME; }

+	bool                is_modifier()           const { return m_type == ModelVolumeType::PARAMETER_MODIFIER; }

+	bool                is_support_enforcer()   const { return m_type == ModelVolumeType::SUPPORT_ENFORCER; }

+	bool                is_support_blocker()    const { return m_type == ModelVolumeType::SUPPORT_BLOCKER; }

+	bool                is_support_modifier()   const { return m_type == ModelVolumeType::SUPPORT_BLOCKER || m_type == ModelVolumeType::SUPPORT_ENFORCER; }

+    t_model_material_id material_id() const { return m_material_id; }

+    void                set_material_id(t_model_material_id material_id);

+    ModelMaterial*      material() const;

+    void                set_material(t_model_material_id material_id, const ModelMaterial &material);

+    // Extract the current extruder ID based on this ModelVolume's config and the parent ModelObject's config.

+    // Extruder ID is only valid for FFF. Returns -1 for SLA or if the extruder ID is not applicable (support volumes).

+    int                 extruder_id() const;

+

+    bool                is_splittable() const;

+

+    // Split this volume, append the result to the object owning this volume.

+    // Return the number of volumes created from this one.

+    // This is useful to assign different materials to different volumes of an object.

+    size_t              split(unsigned int max_extruders);

+    void                translate(double x, double y, double z) { translate(Vec3d(x, y, z)); }

+    void                translate(const Vec3d& displacement);

+    void                scale(const Vec3d& scaling_factors);

+    void                scale(double x, double y, double z) { scale(Vec3d(x, y, z)); }

+    void                scale(double s) { scale(Vec3d(s, s, s)); }

+    void                rotate(double angle, Axis axis);

+    void                rotate(double angle, const Vec3d& axis);

+    void                mirror(Axis axis);

+

+    // This method could only be called before the meshes of this ModelVolumes are not shared!

+    void                scale_geometry_after_creation(const Vec3f &versor);

+    void                scale_geometry_after_creation(const float scale) { this->scale_geometry_after_creation(Vec3f(scale, scale, scale)); }

+

+    // Translates the mesh and the convex hull so that the origin of their vertices is in the center of this volume's bounding box.

+    // Attention! This method may only be called just after ModelVolume creation! It must not be called once the TriangleMesh of this ModelVolume is shared!

+    void                center_geometry_after_creation(bool update_source_offset = true);

+

+    void                calculate_convex_hull();

+    const TriangleMesh& get_convex_hull() const;

+    const std::shared_ptr<const TriangleMesh>& get_convex_hull_shared_ptr() const { return m_convex_hull; }

+    // Get count of errors in the mesh

+    int                 get_repaired_errors_count() const;

+

+    // Helpers for loading / storing into AMF / 3MF files.

+    static ModelVolumeType type_from_string(const std::string &s);

+    static std::string  type_to_string(const ModelVolumeType t);

+

+    const Geometry::Transformation& get_transformation() const { return m_transformation; }

+    void set_transformation(const Geometry::Transformation& transformation) { m_transformation = transformation; }

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    void set_transformation(const Transform3d& trafo) { m_transformation = trafo; }

+#else

+    void set_transformation(const Transform3d &trafo) { m_transformation.set_from_transform(trafo); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_offset() const { return m_transformation.get_offset(); }

+#else

+    const Vec3d& get_offset() const { return m_transformation.get_offset(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_offset(Axis axis) const { return m_transformation.get_offset(axis); }

+

+    void set_offset(const Vec3d& offset) { m_transformation.set_offset(offset); }

+    void set_offset(Axis axis, double offset) { m_transformation.set_offset(axis, offset); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_rotation() const { return m_transformation.get_rotation(); }

+#else

+    const Vec3d& get_rotation() const { return m_transformation.get_rotation(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_rotation(Axis axis) const { return m_transformation.get_rotation(axis); }

+

+    void set_rotation(const Vec3d& rotation) { m_transformation.set_rotation(rotation); }

+    void set_rotation(Axis axis, double rotation) { m_transformation.set_rotation(axis, rotation); }

+

+    Vec3d get_scaling_factor() const { return m_transformation.get_scaling_factor(); }

+    double get_scaling_factor(Axis axis) const { return m_transformation.get_scaling_factor(axis); }

+

+    void set_scaling_factor(const Vec3d& scaling_factor) { m_transformation.set_scaling_factor(scaling_factor); }

+    void set_scaling_factor(Axis axis, double scaling_factor) { m_transformation.set_scaling_factor(axis, scaling_factor); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_mirror() const { return m_transformation.get_mirror(); }

+#else

+    const Vec3d& get_mirror() const { return m_transformation.get_mirror(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_mirror(Axis axis) const { return m_transformation.get_mirror(axis); }

+    bool is_left_handed() const { return m_transformation.is_left_handed(); }

+

+    void set_mirror(const Vec3d& mirror) { m_transformation.set_mirror(mirror); }

+    void set_mirror(Axis axis, double mirror) { m_transformation.set_mirror(axis, mirror); }

+    void convert_from_imperial_units();

+    void convert_from_meters();

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d& get_matrix() const { return m_transformation.get_matrix(); }

+    Transform3d get_matrix_no_offset() const { return m_transformation.get_matrix_no_offset(); }

+#else

+    const Transform3d& get_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false, bool dont_mirror = false) const { return m_transformation.get_matrix(dont_translate, dont_rotate, dont_scale, dont_mirror); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+

+	void set_new_unique_id() { 

+        ObjectBase::set_new_unique_id();

+        this->config.set_new_unique_id();

+        this->supported_facets.set_new_unique_id();

+        this->seam_facets.set_new_unique_id();

+        this->mmu_segmentation_facets.set_new_unique_id();

+    }

+

+    bool is_fdm_support_painted() const { return !this->supported_facets.empty(); }

+    bool is_seam_painted() const { return !this->seam_facets.empty(); }

+    bool is_mm_painted() const { return !this->mmu_segmentation_facets.empty(); }

+

+protected:

+	friend class Print;

+    friend class SLAPrint;

+    friend class Model;

+	friend class ModelObject;

+    friend void model_volume_list_update_supports(ModelObject& model_object_dst, const ModelObject& model_object_new);

+

+	// Copies IDs of both the ModelVolume and its config.

+	explicit ModelVolume(const ModelVolume &rhs) = default;

+    void     set_model_object(ModelObject *model_object) { object = model_object; }

+	void 	 assign_new_unique_ids_recursive() override;

+    void     transform_this_mesh(const Transform3d& t, bool fix_left_handed);

+    void     transform_this_mesh(const Matrix3d& m, bool fix_left_handed);

+

+private:

+    // Parent object owning this ModelVolume.

+    ModelObject*                    	object;

+    // The triangular model.

+    std::shared_ptr<const TriangleMesh> m_mesh;

+    // Is it an object to be printed, or a modifier volume?

+    ModelVolumeType                 	m_type;

+    t_model_material_id             	m_material_id;

+    // The convex hull of this model's mesh.

+    std::shared_ptr<const TriangleMesh> m_convex_hull;

+    Geometry::Transformation        	m_transformation;

+

+    // flag to optimize the checking if the volume is splittable

+    //     -1   ->   is unknown value (before first cheking)

+    //      0   ->   is not splittable

+    //      1   ->   is splittable

+    mutable int               		m_is_splittable{ -1 };

+

+	ModelVolume(ModelObject *object, const TriangleMesh &mesh, ModelVolumeType type = ModelVolumeType::MODEL_PART) : m_mesh(new TriangleMesh(mesh)), m_type(type), object(object)

+    {

+		assert(this->id().valid()); 

+        assert(this->config.id().valid()); 

+        assert(this->supported_facets.id().valid()); 

+        assert(this->seam_facets.id().valid());

+        assert(this->mmu_segmentation_facets.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->supported_facets.id());

+        assert(this->id() != this->seam_facets.id());

+        assert(this->id() != this->mmu_segmentation_facets.id());

+        if (mesh.facets_count() > 1)

+            calculate_convex_hull();

+    }

+    ModelVolume(ModelObject *object, TriangleMesh &&mesh, TriangleMesh &&convex_hull, ModelVolumeType type = ModelVolumeType::MODEL_PART) :

+		m_mesh(new TriangleMesh(std::move(mesh))), m_convex_hull(new TriangleMesh(std::move(convex_hull))), m_type(type), object(object) {

+		assert(this->id().valid()); 

+        assert(this->config.id().valid());

+        assert(this->supported_facets.id().valid());

+        assert(this->seam_facets.id().valid());

+        assert(this->mmu_segmentation_facets.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->supported_facets.id());

+        assert(this->id() != this->seam_facets.id());

+        assert(this->id() != this->mmu_segmentation_facets.id());

+	}

+

+    // Copying an existing volume, therefore this volume will get a copy of the ID assigned.

+    ModelVolume(ModelObject *object, const ModelVolume &other) :

+        ObjectBase(other),

+        name(other.name), source(other.source), m_mesh(other.m_mesh), m_convex_hull(other.m_convex_hull),

+        config(other.config), m_type(other.m_type), object(object), m_transformation(other.m_transformation),

+        supported_facets(other.supported_facets), seam_facets(other.seam_facets), mmu_segmentation_facets(other.mmu_segmentation_facets)

+    {

+		assert(this->id().valid()); 

+        assert(this->config.id().valid()); 

+        assert(this->supported_facets.id().valid());

+        assert(this->seam_facets.id().valid());

+        assert(this->mmu_segmentation_facets.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->supported_facets.id());

+        assert(this->id() != this->seam_facets.id());

+        assert(this->id() != this->mmu_segmentation_facets.id());

+		assert(this->id() == other.id());

+        assert(this->config.id() == other.config.id());

+        assert(this->supported_facets.id() == other.supported_facets.id());

+        assert(this->seam_facets.id() == other.seam_facets.id());

+        assert(this->mmu_segmentation_facets.id() == other.mmu_segmentation_facets.id());

+        this->set_material_id(other.material_id());

+    }

+    // Providing a new mesh, therefore this volume will get a new unique ID assigned.

+    ModelVolume(ModelObject *object, const ModelVolume &other, TriangleMesh &&mesh) :

+        name(other.name), source(other.source), config(other.config), object(object), m_mesh(new TriangleMesh(std::move(mesh))), m_type(other.m_type), m_transformation(other.m_transformation)

+    {

+		assert(this->id().valid()); 

+        assert(this->config.id().valid()); 

+        assert(this->supported_facets.id().valid());

+        assert(this->seam_facets.id().valid());

+        assert(this->mmu_segmentation_facets.id().valid());

+        assert(this->id() != this->config.id());

+        assert(this->id() != this->supported_facets.id());

+        assert(this->id() != this->seam_facets.id());

+        assert(this->id() != this->mmu_segmentation_facets.id());

+		assert(this->id() != other.id());

+        assert(this->config.id() == other.config.id());

+        this->set_material_id(other.material_id());

+        this->config.set_new_unique_id();

+        if (m_mesh->facets_count() > 1)

+            calculate_convex_hull();

+		assert(this->config.id().valid()); 

+        assert(this->config.id() != other.config.id()); 

+        assert(this->supported_facets.id() != other.supported_facets.id());

+        assert(this->seam_facets.id() != other.seam_facets.id());

+        assert(this->mmu_segmentation_facets.id() != other.mmu_segmentation_facets.id());

+        assert(this->id() != this->config.id());

+        assert(this->supported_facets.empty());

+        assert(this->seam_facets.empty());

+        assert(this->mmu_segmentation_facets.empty());

+    }

+

+    ModelVolume& operator=(ModelVolume &rhs) = delete;

+

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	// Used for deserialization, therefore no IDs are allocated.

+	ModelVolume() : ObjectBase(-1), config(-1), supported_facets(-1), seam_facets(-1), mmu_segmentation_facets(-1), object(nullptr) {

+		assert(this->id().invalid());

+        assert(this->config.id().invalid());

+        assert(this->supported_facets.id().invalid());

+        assert(this->seam_facets.id().invalid());

+        assert(this->mmu_segmentation_facets.id().invalid());

+	}

+	template<class Archive> void load(Archive &ar) {

+		bool has_convex_hull;

+        ar(name, source, m_mesh, m_type, m_material_id, m_transformation, m_is_splittable, has_convex_hull);

+        cereal::load_by_value(ar, supported_facets);

+        cereal::load_by_value(ar, seam_facets);

+        cereal::load_by_value(ar, mmu_segmentation_facets);

+        cereal::load_by_value(ar, config);

+		assert(m_mesh);

+		if (has_convex_hull) {

+			cereal::load_optional(ar, m_convex_hull);

+			if (! m_convex_hull && ! m_mesh->empty())

+				// The convex hull was released from the Undo / Redo stack to conserve memory. Recalculate it.

+				this->calculate_convex_hull();

+		} else

+			m_convex_hull.reset();

+	}

+	template<class Archive> void save(Archive &ar) const {

+		bool has_convex_hull = m_convex_hull.get() != nullptr;

+        ar(name, source, m_mesh, m_type, m_material_id, m_transformation, m_is_splittable, has_convex_hull);

+        cereal::save_by_value(ar, supported_facets);

+        cereal::save_by_value(ar, seam_facets);

+        cereal::save_by_value(ar, mmu_segmentation_facets);

+        cereal::save_by_value(ar, config);

+		if (has_convex_hull)

+			cereal::save_optional(ar, m_convex_hull);

+	}

+};

+

+inline void model_volumes_sort_by_id(ModelVolumePtrs &model_volumes)

+{

+    std::sort(model_volumes.begin(), model_volumes.end(), [](const ModelVolume *l, const ModelVolume *r) { return l->id() < r->id(); });

+}

+

+inline const ModelVolume* model_volume_find_by_id(const ModelVolumePtrs &model_volumes, const ObjectID id)

+{

+    auto it = lower_bound_by_predicate(model_volumes.begin(), model_volumes.end(), [id](const ModelVolume *mv) { return mv->id() < id; });

+    return it != model_volumes.end() && (*it)->id() == id ? *it : nullptr;

+}

+

+enum ModelInstanceEPrintVolumeState : unsigned char

+{

+    ModelInstancePVS_Inside,

+    ModelInstancePVS_Partly_Outside,

+    ModelInstancePVS_Fully_Outside,

+    ModelInstanceNum_BedStates

+};

+

+// A single instance of a ModelObject.

+// Knows the affine transformation of an object.

+class ModelInstance final : public ObjectBase

+{

+private:

+    Geometry::Transformation m_transformation;

+

+public:

+    // flag showing the position of this instance with respect to the print volume (set by Print::validate() using ModelObject::check_instances_print_volume_state())

+    ModelInstanceEPrintVolumeState print_volume_state;

+    // Whether or not this instance is printable

+    bool printable;

+

+    ModelObject* get_object() const { return this->object; }

+

+    const Geometry::Transformation& get_transformation() const { return m_transformation; }

+    void set_transformation(const Geometry::Transformation& transformation) { m_transformation = transformation; }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_offset() const { return m_transformation.get_offset(); }

+#else

+    const Vec3d& get_offset() const { return m_transformation.get_offset(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_offset(Axis axis) const { return m_transformation.get_offset(axis); }

+    

+    void set_offset(const Vec3d& offset) { m_transformation.set_offset(offset); }

+    void set_offset(Axis axis, double offset) { m_transformation.set_offset(axis, offset); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_rotation() const { return m_transformation.get_rotation(); }

+#else

+    const Vec3d& get_rotation() const { return m_transformation.get_rotation(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_rotation(Axis axis) const { return m_transformation.get_rotation(axis); }

+

+    void set_rotation(const Vec3d& rotation) { m_transformation.set_rotation(rotation); }

+    void set_rotation(Axis axis, double rotation) { m_transformation.set_rotation(axis, rotation); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_scaling_factor() const { return m_transformation.get_scaling_factor(); }

+#else

+    const Vec3d& get_scaling_factor() const { return m_transformation.get_scaling_factor(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_scaling_factor(Axis axis) const { return m_transformation.get_scaling_factor(axis); }

+

+    void set_scaling_factor(const Vec3d& scaling_factor) { m_transformation.set_scaling_factor(scaling_factor); }

+    void set_scaling_factor(Axis axis, double scaling_factor) { m_transformation.set_scaling_factor(axis, scaling_factor); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_mirror() const { return m_transformation.get_mirror(); }

+#else

+    const Vec3d& get_mirror() const { return m_transformation.get_mirror(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_mirror(Axis axis) const { return m_transformation.get_mirror(axis); }

+	bool is_left_handed() const { return m_transformation.is_left_handed(); }

+    

+    void set_mirror(const Vec3d& mirror) { m_transformation.set_mirror(mirror); }

+    void set_mirror(Axis axis, double mirror) { m_transformation.set_mirror(axis, mirror); }

+

+    // To be called on an external mesh

+    void transform_mesh(TriangleMesh* mesh, bool dont_translate = false) const;

+    // Calculate a bounding box of a transformed mesh. To be called on an external mesh.

+    BoundingBoxf3 transform_mesh_bounding_box(const TriangleMesh& mesh, bool dont_translate = false) const;

+    // Transform an external bounding box.

+    BoundingBoxf3 transform_bounding_box(const BoundingBoxf3 &bbox, bool dont_translate = false) const;

+    // Transform an external vector.

+    Vec3d transform_vector(const Vec3d& v, bool dont_translate = false) const;

+    // To be called on an external polygon. It does not translate the polygon, only rotates and scales.

+    void transform_polygon(Polygon* polygon) const;

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d& get_matrix() const { return m_transformation.get_matrix(); }

+    Transform3d get_matrix_no_offset() const { return m_transformation.get_matrix_no_offset(); }

+#else

+    const Transform3d& get_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false, bool dont_mirror = false) const { return m_transformation.get_matrix(dont_translate, dont_rotate, dont_scale, dont_mirror); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+

+    bool is_printable() const { return object->printable && printable && (print_volume_state == ModelInstancePVS_Inside); }

+

+    // Getting the input polygon for arrange

+    arrangement::ArrangePolygon get_arrange_polygon() const;

+    

+    // Apply the arrange result on the ModelInstance

+    void apply_arrange_result(const Vec2d& offs, double rotation)

+    {

+        // write the transformation data into the model instance

+        set_rotation(Z, rotation);

+        set_offset(X, unscale<double>(offs(X)));

+        set_offset(Y, unscale<double>(offs(Y)));

+        this->object->invalidate_bounding_box();

+    }

+

+protected:

+    friend class Print;

+    friend class SLAPrint;

+    friend class Model;

+    friend class ModelObject;

+

+    explicit ModelInstance(const ModelInstance &rhs) = default;

+    void     set_model_object(ModelObject *model_object) { object = model_object; }

+

+private:

+    // Parent object, owning this instance.

+    ModelObject* object;

+

+    // Constructor, which assigns a new unique ID.

+    explicit ModelInstance(ModelObject* object) : print_volume_state(ModelInstancePVS_Inside), printable(true), object(object) { assert(this->id().valid()); }

+    // Constructor, which assigns a new unique ID.

+    explicit ModelInstance(ModelObject *object, const ModelInstance &other) :

+        m_transformation(other.m_transformation), print_volume_state(ModelInstancePVS_Inside), printable(other.printable), object(object) { assert(this->id().valid() && this->id() != other.id()); }

+

+    explicit ModelInstance(ModelInstance &&rhs) = delete;

+    ModelInstance& operator=(const ModelInstance &rhs) = delete;

+    ModelInstance& operator=(ModelInstance &&rhs) = delete;

+

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	// Used for deserialization, therefore no IDs are allocated.

+	ModelInstance() : ObjectBase(-1), object(nullptr) { assert(this->id().invalid()); }

+	template<class Archive> void serialize(Archive &ar) {

+        ar(m_transformation, print_volume_state, printable);

+    }

+};

+

+

+class ModelWipeTower final : public ObjectBase

+{

+public:

+	Vec2d		position;

+	double 		rotation;

+

+private:

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	friend class Model;

+

+    // Constructors to be only called by derived classes.

+    // Default constructor to assign a unique ID.

+    explicit ModelWipeTower() {}

+    // Constructor with ignored int parameter to assign an invalid ID, to be replaced

+    // by an existing ID copied from elsewhere.

+    explicit ModelWipeTower(int) : ObjectBase(-1) {}

+    // Copy constructor copies the ID.

+	explicit ModelWipeTower(const ModelWipeTower &cfg) = default;

+

+	// Disabled methods.

+	ModelWipeTower(ModelWipeTower &&rhs) = delete;

+	ModelWipeTower& operator=(const ModelWipeTower &rhs) = delete;

+    ModelWipeTower& operator=(ModelWipeTower &&rhs) = delete;

+

+    // For serialization / deserialization of ModelWipeTower composed into another class into the Undo / Redo stack as a separate object.

+    template<typename Archive> void serialize(Archive &ar) { ar(position, rotation); }

+};

+

+// The print bed content.

+// Description of a triangular model with multiple materials, multiple instances with various affine transformations

+// and with multiple modifier meshes.

+// A model groups multiple objects, each object having possibly multiple instances,

+// all objects may share mutliple materials.

+class Model final : public ObjectBase

+{

+public:

+    // Materials are owned by a model and referenced by objects through t_model_material_id.

+    // Single material may be shared by multiple models.

+    ModelMaterialMap    materials;

+    // Objects are owned by a model. Each model may have multiple instances, each instance having its own transformation (shift, scale, rotation).

+    ModelObjectPtrs     objects;

+    // Wipe tower object.

+    ModelWipeTower	    wipe_tower;

+

+    // Extensions for color print

+    CustomGCode::Info custom_gcode_per_print_z;

+    

+    // Default constructor assigns a new ID to the model.

+    Model() { assert(this->id().valid()); }

+    ~Model() { this->clear_objects(); this->clear_materials(); }

+

+    /* To be able to return an object from own copy / clone methods. Hopefully the compiler will do the "Copy elision" */

+    /* (Omits copy and move(since C++11) constructors, resulting in zero - copy pass - by - value semantics). */

+    Model(const Model &rhs) : ObjectBase(-1) { assert(this->id().invalid()); this->assign_copy(rhs); assert(this->id().valid()); assert(this->id() == rhs.id()); }

+    explicit Model(Model &&rhs) : ObjectBase(-1) { assert(this->id().invalid()); this->assign_copy(std::move(rhs)); assert(this->id().valid()); assert(this->id() == rhs.id()); }

+    Model& operator=(const Model &rhs) { this->assign_copy(rhs); assert(this->id().valid()); assert(this->id() == rhs.id()); return *this; }

+    Model& operator=(Model &&rhs) { this->assign_copy(std::move(rhs)); assert(this->id().valid()); assert(this->id() == rhs.id()); return *this; }

+

+    OBJECTBASE_DERIVED_COPY_MOVE_CLONE(Model)

+

+    enum class LoadAttribute : int {

+        AddDefaultInstances,

+        CheckVersion

+    };

+    using LoadAttributes = enum_bitmask<LoadAttribute>;

+

+    static Model read_from_file(

+        const std::string& input_file, 

+        DynamicPrintConfig* config = nullptr, ConfigSubstitutionContext* config_substitutions = nullptr,

+        LoadAttributes options = LoadAttribute::AddDefaultInstances);

+    static Model read_from_archive(

+        const std::string& input_file, 

+        DynamicPrintConfig* config, ConfigSubstitutionContext* config_substitutions,

+        LoadAttributes options = LoadAttribute::AddDefaultInstances);

+

+    // Add a new ModelObject to this Model, generate a new ID for this ModelObject.

+    ModelObject* add_object();

+    ModelObject* add_object(const char *name, const char *path, const TriangleMesh &mesh);

+    ModelObject* add_object(const char *name, const char *path, TriangleMesh &&mesh);

+    ModelObject* add_object(const ModelObject &other);

+    void         delete_object(size_t idx);

+    bool         delete_object(ObjectID id);

+    bool         delete_object(ModelObject* object);

+    void         clear_objects();

+

+    ModelMaterial* add_material(t_model_material_id material_id);

+    ModelMaterial* add_material(t_model_material_id material_id, const ModelMaterial &other);

+    ModelMaterial* get_material(t_model_material_id material_id) {

+        ModelMaterialMap::iterator i = this->materials.find(material_id);

+        return (i == this->materials.end()) ? nullptr : i->second;

+    }

+

+    void          delete_material(t_model_material_id material_id);

+    void          clear_materials();

+    bool          add_default_instances();

+    // Returns approximate axis aligned bounding box of this model

+    BoundingBoxf3 bounding_box() const;

+    // Set the print_volume_state of PrintObject::instances, 

+    // return total number of printable objects.

+    unsigned int  update_print_volume_state(const BuildVolume &build_volume);

+    // Returns true if any ModelObject was modified.

+    bool 		  center_instances_around_point(const Vec2d &point);

+    void 		  translate(coordf_t x, coordf_t y, coordf_t z) { for (ModelObject *o : this->objects) o->translate(x, y, z); }

+    TriangleMesh  mesh() const;

+    

+    // Croaks if the duplicated objects do not fit the print bed.

+    void duplicate_objects_grid(size_t x, size_t y, coordf_t dist);

+

+    bool 		  looks_like_multipart_object() const;

+    void 		  convert_multipart_object(unsigned int max_extruders);

+    bool          looks_like_imperial_units() const;

+    void          convert_from_imperial_units(bool only_small_volumes);

+    bool          looks_like_saved_in_meters() const;

+    void          convert_from_meters(bool only_small_volumes);

+    int           removed_objects_with_zero_volume();

+

+    // Ensures that the min z of the model is not negative

+    void 		  adjust_min_z();

+

+    void 		  print_info() const { for (const ModelObject *o : this->objects) o->print_info(); }

+

+    // Propose an output file name & path based on the first printable object's name and source input file's path.

+    std::string   propose_export_file_name_and_path() const;

+    // Propose an output path, replace extension. The new_extension shall contain the initial dot.

+    std::string   propose_export_file_name_and_path(const std::string &new_extension) const;

+

+    // Checks if any of objects is painted using the fdm support painting gizmo.

+    bool          is_fdm_support_painted() const;

+    // Checks if any of objects is painted using the seam painting gizmo.

+    bool          is_seam_painted() const;

+    // Checks if any of objects is painted using the multi-material painting gizmo.

+    bool          is_mm_painted() const;

+

+private:

+    explicit Model(int) : ObjectBase(-1) { assert(this->id().invalid()); }

+	void assign_new_unique_ids_recursive();

+	void update_links_bottom_up_recursive();

+

+	friend class cereal::access;

+	friend class UndoRedo::StackImpl;

+	template<class Archive> void serialize(Archive &ar) {

+		Internal::StaticSerializationWrapper<ModelWipeTower> wipe_tower_wrapper(wipe_tower);

+		ar(materials, objects, wipe_tower_wrapper);

+    }

+};

+

+ENABLE_ENUM_BITMASK_OPERATORS(Model::LoadAttribute)

+

+#undef OBJECTBASE_DERIVED_COPY_MOVE_CLONE

+#undef OBJECTBASE_DERIVED_PRIVATE_COPY_MOVE

+

+// Test whether the two models contain the same number of ModelObjects with the same set of IDs

+// ordered in the same order. In that case it is not necessary to kill the background processing.

+bool model_object_list_equal(const Model &model_old, const Model &model_new);

+

+// Test whether the new model is just an extension of the old model (new objects were added

+// to the end of the original list. In that case it is not necessary to kill the background processing.

+bool model_object_list_extended(const Model &model_old, const Model &model_new);

+

+// Test whether the new ModelObject contains a different set of volumes (or sorted in a different order)

+// than the old ModelObject.

+bool model_volume_list_changed(const ModelObject &model_object_old, const ModelObject &model_object_new, const ModelVolumeType type);

+bool model_volume_list_changed(const ModelObject &model_object_old, const ModelObject &model_object_new, const std::initializer_list<ModelVolumeType> &types);

+

+// Test whether the now ModelObject has newer custom supports data than the old one.

+// The function assumes that volumes list is synchronized.

+bool model_custom_supports_data_changed(const ModelObject& mo, const ModelObject& mo_new);

+

+// Test whether the now ModelObject has newer custom seam data than the old one.

+// The function assumes that volumes list is synchronized.

+bool model_custom_seam_data_changed(const ModelObject& mo, const ModelObject& mo_new);

+

+// Test whether the now ModelObject has newer MMU segmentation data than the old one.

+// The function assumes that volumes list is synchronized.

+extern bool model_mmu_segmentation_data_changed(const ModelObject& mo, const ModelObject& mo_new);

+

+// If the model has multi-part objects, then it is currently not supported by the SLA mode.

+// Either the model cannot be loaded, or a SLA printer has to be activated.

+bool model_has_multi_part_objects(const Model &model);

+// If the model has advanced features, then it cannot be processed in simple mode.

+bool model_has_advanced_features(const Model &model);

+

+#ifndef NDEBUG

+// Verify whether the IDs of Model / ModelObject / ModelVolume / ModelInstance / ModelMaterial are valid and unique.

+void check_model_ids_validity(const Model &model);

+void check_model_ids_equal(const Model &model1, const Model &model2);

+#endif /* NDEBUG */

+

+static const float SINKING_Z_THRESHOLD = -0.001f;

+static const double SINKING_MIN_Z_THRESHOLD = 0.05;

+

+} // namespace Slic3r

+

+namespace cereal

+{

+	template <class Archive> struct specialize<Archive, Slic3r::ModelVolume, cereal::specialization::member_load_save> {};

+	template <class Archive> struct specialize<Archive, Slic3r::ModelConfigObject, cereal::specialization::member_serialize> {};

+}

+

+#endif /* slic3r_Model_hpp_ */

diff --git a/src/libslic3r/Point.hpp b/src/libslic3r/Point.hpp
index 84152ee9c..4fc76800c 100644
--- a/src/libslic3r/Point.hpp
+++ b/src/libslic3r/Point.hpp
@@ -1,565 +1,569 @@
-#ifndef slic3r_Point_hpp_
-#define slic3r_Point_hpp_
-
-#include "libslic3r.h"
-#include <cstddef>
-#include <vector>
-#include <cmath>
-#include <string>
-#include <sstream>
-#include <unordered_map>
-
-#include <Eigen/Geometry> 
-
-#include "LocalesUtils.hpp"
-
-namespace Slic3r {
-
-class BoundingBox;
-class BoundingBoxf;
-class Line;
-class MultiPoint;
-class Point;
-using Vector = Point;
-
-// Base template for eigen derived vectors
-template<int N, int M, class T>
-using Mat = Eigen::Matrix<T, N, M, Eigen::DontAlign, N, M>;
-
-template<int N, class T> using Vec = Mat<N, 1, T>;
-
-template<typename NumberType>
-using DynVec = Eigen::Matrix<NumberType, Eigen::Dynamic, 1>;
-
-// Eigen types, to replace the Slic3r's own types in the future.
-// Vector types with a fixed point coordinate base type.
-using Vec2crd = Eigen::Matrix<coord_t,  2, 1, Eigen::DontAlign>;
-using Vec3crd = Eigen::Matrix<coord_t,  3, 1, Eigen::DontAlign>;
-using Vec2i   = Eigen::Matrix<int,      2, 1, Eigen::DontAlign>;
-using Vec3i   = Eigen::Matrix<int,      3, 1, Eigen::DontAlign>;
-using Vec4i   = Eigen::Matrix<int,      4, 1, Eigen::DontAlign>;
-using Vec2i32 = Eigen::Matrix<int32_t,  2, 1, Eigen::DontAlign>;
-using Vec2i64 = Eigen::Matrix<int64_t,  2, 1, Eigen::DontAlign>;
-using Vec3i32 = Eigen::Matrix<int32_t,  3, 1, Eigen::DontAlign>;
-using Vec3i64 = Eigen::Matrix<int64_t,  3, 1, Eigen::DontAlign>;
-
-// Vector types with a double coordinate base type.
-using Vec2f   = Eigen::Matrix<float,    2, 1, Eigen::DontAlign>;
-using Vec3f   = Eigen::Matrix<float,    3, 1, Eigen::DontAlign>;
-using Vec2d   = Eigen::Matrix<double,   2, 1, Eigen::DontAlign>;
-using Vec3d   = Eigen::Matrix<double,   3, 1, Eigen::DontAlign>;
-
-using Points         = std::vector<Point>;
-using PointPtrs      = std::vector<Point*>;
-using PointConstPtrs = std::vector<const Point*>;
-using Points3        = std::vector<Vec3crd>;
-using Pointfs        = std::vector<Vec2d>;
-using Vec2ds         = std::vector<Vec2d>;
-using Pointf3s       = std::vector<Vec3d>;
-
-using Matrix2f       = Eigen::Matrix<float,  2, 2, Eigen::DontAlign>;
-using Matrix2d       = Eigen::Matrix<double, 2, 2, Eigen::DontAlign>;
-using Matrix3f       = Eigen::Matrix<float,  3, 3, Eigen::DontAlign>;
-using Matrix3d       = Eigen::Matrix<double, 3, 3, Eigen::DontAlign>;
-using Matrix4f       = Eigen::Matrix<float,  4, 4, Eigen::DontAlign>;
-using Matrix4d       = Eigen::Matrix<double, 4, 4, Eigen::DontAlign>;
-
-template<int N, class T>
-using Transform = Eigen::Transform<float, N, Eigen::Affine, Eigen::DontAlign>;
-
-using Transform2f    = Eigen::Transform<float,  2, Eigen::Affine, Eigen::DontAlign>;
-using Transform2d    = Eigen::Transform<double, 2, Eigen::Affine, Eigen::DontAlign>;
-using Transform3f    = Eigen::Transform<float,  3, Eigen::Affine, Eigen::DontAlign>;
-using Transform3d    = Eigen::Transform<double, 3, Eigen::Affine, Eigen::DontAlign>;
-
-// I don't know why Eigen::Transform::Identity() return a const object...
-template<int N, class T> Transform<N, T> identity() { return Transform<N, T>::Identity(); }
-inline const auto &identity3f = identity<3, float>;
-inline const auto &identity3d = identity<3, double>;
-
-inline bool operator<(const Vec2d &lhs, const Vec2d &rhs) { return lhs.x() < rhs.x() || (lhs.x() == rhs.x() && lhs.y() < rhs.y()); }
-
-// Cross product of two 2D vectors.
-// None of the vectors may be of int32_t type as the result would overflow.
-template<typename Derived, typename Derived2>
-inline typename Derived::Scalar cross2(const Eigen::MatrixBase<Derived> &v1, const Eigen::MatrixBase<Derived2> &v2)
-{
-    static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) == 2, "cross2(): first parameter is not a 2D vector");
-    static_assert(Derived2::IsVectorAtCompileTime && int(Derived2::SizeAtCompileTime) == 2, "cross2(): first parameter is not a 2D vector");
-    static_assert(! std::is_same<typename Derived::Scalar, int32_t>::value, "cross2(): Scalar type must not be int32_t, otherwise the cross product would overflow.");
-    static_assert(std::is_same<typename Derived::Scalar, typename Derived2::Scalar>::value, "cross2(): Scalar types of 1st and 2nd operand must be equal.");
-    return v1.x() * v2.y() - v1.y() * v2.x();
-}
-
-// 2D vector perpendicular to the argument.
-template<typename Derived>
-inline Eigen::Matrix<typename Derived::Scalar, 2, 1, Eigen::DontAlign> perp(const Eigen::MatrixBase<Derived> &v)
-{ 
-    static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) == 2, "perp(): parameter is not a 2D vector");
-    return { - v.y(), v.x() };
-}
-
-// Angle from v1 to v2, returning double atan2(y, x) normalized to <-PI, PI>.
-template<typename Derived, typename Derived2>
-inline double angle(const Eigen::MatrixBase<Derived> &v1, const Eigen::MatrixBase<Derived2> &v2) {
-    static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) == 2, "angle(): first parameter is not a 2D vector");
-    static_assert(Derived2::IsVectorAtCompileTime && int(Derived2::SizeAtCompileTime) == 2, "angle(): second parameter is not a 2D vector");
-    auto v1d = v1.template cast<double>();
-    auto v2d = v2.template cast<double>();
-    return atan2(cross2(v1d, v2d), v1d.dot(v2d));
-}
-
-template<class T, int N, int Options>
-Eigen::Matrix<T, 2, 1, Eigen::DontAlign> to_2d(const Eigen::MatrixBase<Eigen::Matrix<T, N, 1, Options>> &ptN) { return { ptN.x(), ptN.y() }; }
-
-template<class T, int Options>
-Eigen::Matrix<T, 3, 1, Eigen::DontAlign> to_3d(const Eigen::MatrixBase<Eigen::Matrix<T, 2, 1, Options>> & pt, const T z) { return { pt.x(), pt.y(), z }; }
-
-inline Vec2d   unscale(coord_t x, coord_t y) { return Vec2d(unscale<double>(x), unscale<double>(y)); }
-inline Vec2d   unscale(const Vec2crd &pt) { return Vec2d(unscale<double>(pt.x()), unscale<double>(pt.y())); }
-inline Vec2d   unscale(const Vec2d   &pt) { return Vec2d(unscale<double>(pt.x()), unscale<double>(pt.y())); }
-inline Vec3d   unscale(coord_t x, coord_t y, coord_t z) { return Vec3d(unscale<double>(x), unscale<double>(y), unscale<double>(z)); }
-inline Vec3d   unscale(const Vec3crd &pt) { return Vec3d(unscale<double>(pt.x()), unscale<double>(pt.y()), unscale<double>(pt.z())); }
-inline Vec3d   unscale(const Vec3d   &pt) { return Vec3d(unscale<double>(pt.x()), unscale<double>(pt.y()), unscale<double>(pt.z())); }
-
-inline std::string to_string(const Vec2crd &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + "]"; }
-inline std::string to_string(const Vec2d   &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + "]"; }
-inline std::string to_string(const Vec3crd &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + ", " + float_to_string_decimal_point(pt.z()) + "]"; }
-inline std::string to_string(const Vec3d   &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + ", " + float_to_string_decimal_point(pt.z()) + "]"; }
-
-std::vector<Vec3f> transform(const std::vector<Vec3f>& points, const Transform3f& t);
-Pointf3s transform(const Pointf3s& points, const Transform3d& t);
-
-template<int N, class T> using Vec = Eigen::Matrix<T,  N, 1, Eigen::DontAlign, N, 1>;
-
-class Point : public Vec2crd
-{
-public:
-    using coord_type = coord_t;
-
-    Point() : Vec2crd(0, 0) {}
-    Point(int32_t x, int32_t y) : Vec2crd(coord_t(x), coord_t(y)) {}
-    Point(int64_t x, int64_t y) : Vec2crd(coord_t(x), coord_t(y)) {}
-    Point(double x, double y) : Vec2crd(coord_t(lrint(x)), coord_t(lrint(y))) {}
-    Point(const Point &rhs) { *this = rhs; }
-	explicit Point(const Vec2d& rhs) : Vec2crd(coord_t(lrint(rhs.x())), coord_t(lrint(rhs.y()))) {}
-	// This constructor allows you to construct Point from Eigen expressions
-    template<typename OtherDerived>
-    Point(const Eigen::MatrixBase<OtherDerived> &other) : Vec2crd(other) {}
-    static Point new_scale(coordf_t x, coordf_t y) { return Point(coord_t(scale_(x)), coord_t(scale_(y))); }
-    static Point new_scale(const Vec2d &v) { return Point(coord_t(scale_(v.x())), coord_t(scale_(v.y()))); }
-    static Point new_scale(const Vec2f &v) { return Point(coord_t(scale_(v.x())), coord_t(scale_(v.y()))); }
-
-    // This method allows you to assign Eigen expressions to MyVectorType
-    template<typename OtherDerived>
-    Point& operator=(const Eigen::MatrixBase<OtherDerived> &other)
-    {
-        this->Vec2crd::operator=(other);
-        return *this;
-    }
-
-    Point& operator+=(const Point& rhs) { this->x() += rhs.x(); this->y() += rhs.y(); return *this; }
-    Point& operator-=(const Point& rhs) { this->x() -= rhs.x(); this->y() -= rhs.y(); return *this; }
-	Point& operator*=(const double &rhs) { this->x() = coord_t(this->x() * rhs); this->y() = coord_t(this->y() * rhs); return *this; }
-    Point operator*(const double &rhs) { return Point(this->x() * rhs, this->y() * rhs); }
-
-    void   rotate(double angle) { this->rotate(std::cos(angle), std::sin(angle)); }
-    void   rotate(double cos_a, double sin_a) {
-        double cur_x = (double)this->x();
-        double cur_y = (double)this->y();
-        this->x() = (coord_t)round(cos_a * cur_x - sin_a * cur_y);
-        this->y() = (coord_t)round(cos_a * cur_y + sin_a * cur_x);
-    }
-
-    void   rotate(double angle, const Point &center);
-    Point  rotated(double angle) const { Point res(*this); res.rotate(angle); return res; }
-    Point  rotated(double cos_a, double sin_a) const { Point res(*this); res.rotate(cos_a, sin_a); return res; }
-    Point  rotated(double angle, const Point &center) const { Point res(*this); res.rotate(angle, center); return res; }
-    int    nearest_point_index(const Points &points) const;
-    int    nearest_point_index(const PointConstPtrs &points) const;
-    int    nearest_point_index(const PointPtrs &points) const;
-    bool   nearest_point(const Points &points, Point* point) const;
-    Point  projection_onto(const MultiPoint &poly) const;
-    Point  projection_onto(const Line &line) const;
-};
-
-inline bool operator<(const Point &l, const Point &r) 
-{ 
-    return l.x() < r.x() || (l.x() == r.x() && l.y() < r.y());
-}
-
-inline Point operator* (const Point& l, const double &r)
-{
-    return {coord_t(l.x() * r), coord_t(l.y() * r)};
-}
-
-inline bool is_approx(const Point &p1, const Point &p2, coord_t epsilon = coord_t(SCALED_EPSILON))
-{
-	Point d = (p2 - p1).cwiseAbs();
-	return d.x() < epsilon && d.y() < epsilon;
-}
-
-inline bool is_approx(const Vec2f &p1, const Vec2f &p2, float epsilon = float(EPSILON))
-{
-	Vec2f d = (p2 - p1).cwiseAbs();
-	return d.x() < epsilon && d.y() < epsilon;
-}
-
-inline bool is_approx(const Vec2d &p1, const Vec2d &p2, double epsilon = EPSILON)
-{
-	Vec2d d = (p2 - p1).cwiseAbs();
-	return d.x() < epsilon && d.y() < epsilon;
-}
-
-inline bool is_approx(const Vec3f &p1, const Vec3f &p2, float epsilon = float(EPSILON))
-{
-	Vec3f d = (p2 - p1).cwiseAbs();
-	return d.x() < epsilon && d.y() < epsilon && d.z() < epsilon;
-}
-
-inline bool is_approx(const Vec3d &p1, const Vec3d &p2, double epsilon = EPSILON)
-{
-	Vec3d d = (p2 - p1).cwiseAbs();
-	return d.x() < epsilon && d.y() < epsilon && d.z() < epsilon;
-}
-
-inline Point lerp(const Point &a, const Point &b, double t)
-{
-    assert((t >= -EPSILON) && (t <= 1. + EPSILON));
-    return ((1. - t) * a.cast<double>() + t * b.cast<double>()).cast<coord_t>();
-}
-
-BoundingBox get_extents(const Points &pts);
-BoundingBox get_extents(const std::vector<Points> &pts);
-BoundingBoxf get_extents(const std::vector<Vec2d> &pts);
-
-// Test for duplicate points in a vector of points.
-// The points are copied, sorted and checked for duplicates globally.
-bool        has_duplicate_points(std::vector<Point> &&pts);
-inline bool has_duplicate_points(const std::vector<Point> &pts)
-{
-    std::vector<Point> cpy = pts;
-    return has_duplicate_points(std::move(cpy));
-}
-
-// Test for duplicate points in a vector of points.
-// Only successive points are checked for equality.
-inline bool has_duplicate_successive_points(const std::vector<Point> &pts)
-{
-    for (size_t i = 1; i < pts.size(); ++ i)
-        if (pts[i - 1] == pts[i])
-            return true;
-    return false;
-}
-
-// Test for duplicate points in a vector of points.
-// Only successive points are checked for equality. Additionally, first and last points are compared for equality.
-inline bool has_duplicate_successive_points_closed(const std::vector<Point> &pts)
-{
-    return has_duplicate_successive_points(pts) || (pts.size() >= 2 && pts.front() == pts.back());
-}
-
-namespace int128 {
-    // Exact orientation predicate,
-    // returns +1: CCW, 0: collinear, -1: CW.
-    int orient(const Vec2crd &p1, const Vec2crd &p2, const Vec2crd &p3);
-    // Exact orientation predicate,
-    // returns +1: CCW, 0: collinear, -1: CW.
-    int cross(const Vec2crd &v1, const Vec2crd &v2);
-}
-
-// To be used by std::unordered_map, std::unordered_multimap and friends.
-struct PointHash {
-    size_t operator()(const Vec2crd &pt) const {
-        return coord_t((89 * 31 + int64_t(pt.x())) * 31 + pt.y());
-    }
-};
-
-// A generic class to search for a closest Point in a given radius.
-// It uses std::unordered_multimap to implement an efficient 2D spatial hashing.
-// The PointAccessor has to return const Point*.
-// If a nullptr is returned, it is ignored by the query.
-template<typename ValueType, typename PointAccessor> class ClosestPointInRadiusLookup
-{
-public:
-    ClosestPointInRadiusLookup(coord_t search_radius, PointAccessor point_accessor = PointAccessor()) : 
-		m_search_radius(search_radius), m_point_accessor(point_accessor), m_grid_log2(0)
-    {
-        // Resolution of a grid, twice the search radius + some epsilon.
-		coord_t gridres = 2 * m_search_radius + 4;
-        m_grid_resolution = gridres;
-        assert(m_grid_resolution > 0);
-        assert(m_grid_resolution < (coord_t(1) << 30));
-		// Compute m_grid_log2 = log2(m_grid_resolution)
-		if (m_grid_resolution > 32767) {
-			m_grid_resolution >>= 16;
-			m_grid_log2 += 16;
-		}
-		if (m_grid_resolution > 127) {
-			m_grid_resolution >>= 8;
-			m_grid_log2 += 8;
-		}
-		if (m_grid_resolution > 7) {
-			m_grid_resolution >>= 4;
-			m_grid_log2 += 4;
-		}
-		if (m_grid_resolution > 1) {
-			m_grid_resolution >>= 2;
-			m_grid_log2 += 2;
-		}
-		if (m_grid_resolution > 0)
-			++ m_grid_log2;
-		m_grid_resolution = 1 << m_grid_log2;
-		assert(m_grid_resolution >= gridres);
-		assert(gridres > m_grid_resolution / 2);
-    }
-
-    void insert(const ValueType &value) {
-        const Vec2crd *pt = m_point_accessor(value);
-        if (pt != nullptr)
-            m_map.emplace(std::make_pair(Vec2crd(pt->x()>>m_grid_log2, pt->y()>>m_grid_log2), value));
-    }
-
-    void insert(ValueType &&value) {
-        const Vec2crd *pt = m_point_accessor(value);
-        if (pt != nullptr)
-            m_map.emplace(std::make_pair(Vec2crd(pt->x()>>m_grid_log2, pt->y()>>m_grid_log2), std::move(value)));
-    }
-
-    // Erase a data point equal to value. (ValueType has to declare the operator==).
-    // Returns true if the data point equal to value was found and removed.
-    bool erase(const ValueType &value) {
-        const Point *pt = m_point_accessor(value);
-        if (pt != nullptr) {
-            // Range of fragment starts around grid_corner, close to pt.
-            auto range = m_map.equal_range(Point((*pt).x()>>m_grid_log2, (*pt).y()>>m_grid_log2));
-            // Remove the first item.
-            for (auto it = range.first; it != range.second; ++ it) {
-                if (it->second == value) {
-                    m_map.erase(it);
-                    return true;
-                }
-            }
-        }
-        return false;
-    }
-
-    // Return a pair of <ValueType*, distance_squared>
-    std::pair<const ValueType*, double> find(const Vec2crd &pt) {
-        // Iterate over 4 closest grid cells around pt,
-        // find the closest start point inside these cells to pt.
-        const ValueType *value_min = nullptr;
-        double           dist_min = std::numeric_limits<double>::max();
-        // Round pt to a closest grid_cell corner.
-        Vec2crd            grid_corner((pt.x()+(m_grid_resolution>>1))>>m_grid_log2, (pt.y()+(m_grid_resolution>>1))>>m_grid_log2);
-        // For four neighbors of grid_corner:
-        for (coord_t neighbor_y = -1; neighbor_y < 1; ++ neighbor_y) {
-            for (coord_t neighbor_x = -1; neighbor_x < 1; ++ neighbor_x) {
-                // Range of fragment starts around grid_corner, close to pt.
-                auto range = m_map.equal_range(Vec2crd(grid_corner.x() + neighbor_x, grid_corner.y() + neighbor_y));
-                // Find the map entry closest to pt.
-                for (auto it = range.first; it != range.second; ++it) {
-                    const ValueType &value = it->second;
-                    const Vec2crd *pt2 = m_point_accessor(value);
-                    if (pt2 != nullptr) {
-                        const double d2 = (pt - *pt2).cast<double>().squaredNorm();
-                        if (d2 < dist_min) {
-                            dist_min = d2;
-                            value_min = &value;
-                        }
-                    }
-                }
-            }
-        }
-        return (value_min != nullptr && dist_min < coordf_t(m_search_radius) * coordf_t(m_search_radius)) ? 
-            std::make_pair(value_min, dist_min) : 
-            std::make_pair(nullptr, std::numeric_limits<double>::max());
-    }
-
-    // Returns all pairs of values and squared distances.
-    std::vector<std::pair<const ValueType*, double>> find_all(const Vec2crd &pt) {
-        // Iterate over 4 closest grid cells around pt,
-        // Round pt to a closest grid_cell corner.
-        Vec2crd      grid_corner((pt.x()+(m_grid_resolution>>1))>>m_grid_log2, (pt.y()+(m_grid_resolution>>1))>>m_grid_log2);
-        // For four neighbors of grid_corner:
-        std::vector<std::pair<const ValueType*, double>> out;
-        const double r2 = double(m_search_radius) * m_search_radius;
-        for (coord_t neighbor_y = -1; neighbor_y < 1; ++ neighbor_y) {
-            for (coord_t neighbor_x = -1; neighbor_x < 1; ++ neighbor_x) {
-                // Range of fragment starts around grid_corner, close to pt.
-                auto range = m_map.equal_range(Vec2crd(grid_corner.x() + neighbor_x, grid_corner.y() + neighbor_y));
-                // Find the map entry closest to pt.
-                for (auto it = range.first; it != range.second; ++it) {
-                    const ValueType &value = it->second;
-                    const Vec2crd *pt2 = m_point_accessor(value);
-                    if (pt2 != nullptr) {
-                        const double d2 = (pt - *pt2).cast<double>().squaredNorm();
-                        if (d2 <= r2)
-                            out.emplace_back(&value, d2);
-                    }
-                }
-            }
-        }
-        return out;
-    }
-
-private:
-    using map_type = typename std::unordered_multimap<Vec2crd, ValueType, PointHash>;
-    PointAccessor m_point_accessor;
-    map_type m_map;
-    coord_t  m_search_radius;
-    coord_t  m_grid_resolution;
-    coord_t  m_grid_log2;
-};
-
-std::ostream& operator<<(std::ostream &stm, const Vec2d &pointf);
-
-
-// /////////////////////////////////////////////////////////////////////////////
-// Type safe conversions to and from scaled and unscaled coordinates
-// /////////////////////////////////////////////////////////////////////////////
-
-// Semantics are the following:
-// Upscaling (scaled()): only from floating point types (or Vec) to either
-//                       floating point or integer 'scaled coord' coordinates.
-// Downscaling (unscaled()): from arithmetic (or Vec) to floating point only
-
-// Conversion definition from unscaled to floating point scaled
-template<class Tout,
-         class Tin,
-         class = FloatingOnly<Tin>>
-inline constexpr FloatingOnly<Tout> scaled(const Tin &v) noexcept
-{
-    return Tout(v / Tin(SCALING_FACTOR));
-}
-
-// Conversion definition from unscaled to integer 'scaled coord'.
-// TODO: is the rounding necessary? Here it is commented  out to show that
-// it can be different for integers but it does not have to be. Using
-// std::round means loosing noexcept and constexpr modifiers
-template<class Tout = coord_t, class Tin, class = FloatingOnly<Tin>>
-inline constexpr ScaledCoordOnly<Tout> scaled(const Tin &v) noexcept
-{
-    //return static_cast<Tout>(std::round(v / SCALING_FACTOR));
-    return Tout(v / Tin(SCALING_FACTOR));
-}
-
-// Conversion for Eigen vectors (N dimensional points)
-template<class Tout = coord_t,
-         class Tin,
-         int N,
-         class = FloatingOnly<Tin>,
-         int...EigenArgs>
-inline Eigen::Matrix<ArithmeticOnly<Tout>, N, EigenArgs...>
-scaled(const Eigen::Matrix<Tin, N, EigenArgs...> &v)
-{
-    return (v / SCALING_FACTOR).template cast<Tout>();
-}
-
-// Conversion from arithmetic scaled type to floating point unscaled
-template<class Tout = double,
-         class Tin,
-         class = ArithmeticOnly<Tin>,
-         class = FloatingOnly<Tout>>
-inline constexpr Tout unscaled(const Tin &v) noexcept
-{
-    return Tout(v) * Tout(SCALING_FACTOR);
-}
-
-// Unscaling for Eigen vectors. Input base type can be arithmetic, output base
-// type can only be floating point.
-template<class Tout = double,
-         class Tin,
-         int N,
-         class = ArithmeticOnly<Tin>,
-         class = FloatingOnly<Tout>,
-         int...EigenArgs>
-inline constexpr Eigen::Matrix<Tout, N, EigenArgs...>
-unscaled(const Eigen::Matrix<Tin, N, EigenArgs...> &v) noexcept
-{
-    return v.template cast<Tout>() * Tout(SCALING_FACTOR);
-}
-
-// Align a coordinate to a grid. The coordinate may be negative,
-// the aligned value will never be bigger than the original one.
-inline coord_t align_to_grid(const coord_t coord, const coord_t spacing) {
-    // Current C++ standard defines the result of integer division to be rounded to zero,
-    // for both positive and negative numbers. Here we want to round down for negative
-    // numbers as well.
-    coord_t aligned = (coord < 0) ?
-            ((coord - spacing + 1) / spacing) * spacing :
-            (coord / spacing) * spacing;
-    assert(aligned <= coord);
-    return aligned;
-}
-inline Point   align_to_grid(Point   coord, Point   spacing) 
-    { return Point(align_to_grid(coord.x(), spacing.x()), align_to_grid(coord.y(), spacing.y())); }
-inline coord_t align_to_grid(coord_t coord, coord_t spacing, coord_t base) 
-    { return base + align_to_grid(coord - base, spacing); }
-inline Point   align_to_grid(Point   coord, Point   spacing, Point   base)
-    { return Point(align_to_grid(coord.x(), spacing.x(), base.x()), align_to_grid(coord.y(), spacing.y(), base.y())); }
-
-} // namespace Slic3r
-
-// start Boost
-#include <boost/version.hpp>
-#include <boost/polygon/polygon.hpp>
-namespace boost { namespace polygon {
-    template <>
-    struct geometry_concept<Slic3r::Point> { using type = point_concept; };
-   
-    template <>
-    struct point_traits<Slic3r::Point> {
-        using coordinate_type = coord_t;
-    
-        static inline coordinate_type get(const Slic3r::Point& point, orientation_2d orient) {
-            return static_cast<coordinate_type>(point((orient == HORIZONTAL) ? 0 : 1));
-        }
-    };
-    
-    template <>
-    struct point_mutable_traits<Slic3r::Point> {
-        using coordinate_type = coord_t;
-        static inline void set(Slic3r::Point& point, orientation_2d orient, coord_t value) {
-            point((orient == HORIZONTAL) ? 0 : 1) = value;
-        }
-        static inline Slic3r::Point construct(coord_t x_value, coord_t y_value) {
-            return Slic3r::Point(x_value, y_value);
-        }
-    };
-} }
-// end Boost
-
-// Serialization through the Cereal library
-namespace cereal {
-//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2crd &v) { archive(v.x(), v.y()); }
-//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3crd &v) { archive(v.x(), v.y(), v.z()); }
-	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2i   &v) { archive(v.x(), v.y()); }
-	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3i   &v) { archive(v.x(), v.y(), v.z()); }
-//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2i64 &v) { archive(v.x(), v.y()); }
-//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3i64 &v) { archive(v.x(), v.y(), v.z()); }
-	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2f   &v) { archive(v.x(), v.y()); }
-	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3f   &v) { archive(v.x(), v.y(), v.z()); }
-	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2d   &v) { archive(v.x(), v.y()); }
-	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3d   &v) { archive(v.x(), v.y(), v.z()); }
-
-	template<class Archive> void load(Archive& archive, Slic3r::Matrix2f &m) { archive.loadBinary((char*)m.data(), sizeof(float) * 4); }
-	template<class Archive> void save(Archive& archive, Slic3r::Matrix2f &m) { archive.saveBinary((char*)m.data(), sizeof(float) * 4); }
-}
-
-// To be able to use Vec<> and Mat<> in range based for loops:
-namespace Eigen {
-template<class T, int N, int M>
-T* begin(Slic3r::Mat<N, M, T> &mat) { return mat.data(); }
-
-template<class T, int N, int M>
-T* end(Slic3r::Mat<N, M, T> &mat) { return mat.data() + N * M; }
-
-template<class T, int N, int M>
-const T* begin(const Slic3r::Mat<N, M, T> &mat) { return mat.data(); }
-
-template<class T, int N, int M>
-const T* end(const Slic3r::Mat<N, M, T> &mat) { return mat.data() + N * M; }
-} // namespace Eigen
-
-#endif
+#ifndef slic3r_Point_hpp_

+#define slic3r_Point_hpp_

+

+#include "libslic3r.h"

+#include <cstddef>

+#include <vector>

+#include <cmath>

+#include <string>

+#include <sstream>

+#include <unordered_map>

+

+#include <Eigen/Geometry> 

+

+#include "LocalesUtils.hpp"

+

+namespace Slic3r {

+

+class BoundingBox;

+class BoundingBoxf;

+class Line;

+class MultiPoint;

+class Point;

+using Vector = Point;

+

+// Base template for eigen derived vectors

+template<int N, int M, class T>

+using Mat = Eigen::Matrix<T, N, M, Eigen::DontAlign, N, M>;

+

+template<int N, class T> using Vec = Mat<N, 1, T>;

+

+template<typename NumberType>

+using DynVec = Eigen::Matrix<NumberType, Eigen::Dynamic, 1>;

+

+// Eigen types, to replace the Slic3r's own types in the future.

+// Vector types with a fixed point coordinate base type.

+using Vec2crd = Eigen::Matrix<coord_t,  2, 1, Eigen::DontAlign>;

+using Vec3crd = Eigen::Matrix<coord_t,  3, 1, Eigen::DontAlign>;

+using Vec2i   = Eigen::Matrix<int,      2, 1, Eigen::DontAlign>;

+using Vec3i   = Eigen::Matrix<int,      3, 1, Eigen::DontAlign>;

+using Vec4i   = Eigen::Matrix<int,      4, 1, Eigen::DontAlign>;

+using Vec2i32 = Eigen::Matrix<int32_t,  2, 1, Eigen::DontAlign>;

+using Vec2i64 = Eigen::Matrix<int64_t,  2, 1, Eigen::DontAlign>;

+using Vec3i32 = Eigen::Matrix<int32_t,  3, 1, Eigen::DontAlign>;

+using Vec3i64 = Eigen::Matrix<int64_t,  3, 1, Eigen::DontAlign>;

+

+// Vector types with a double coordinate base type.

+using Vec2f   = Eigen::Matrix<float,    2, 1, Eigen::DontAlign>;

+using Vec3f   = Eigen::Matrix<float,    3, 1, Eigen::DontAlign>;

+using Vec2d   = Eigen::Matrix<double,   2, 1, Eigen::DontAlign>;

+using Vec3d   = Eigen::Matrix<double,   3, 1, Eigen::DontAlign>;

+

+using Points         = std::vector<Point>;

+using PointPtrs      = std::vector<Point*>;

+using PointConstPtrs = std::vector<const Point*>;

+using Points3        = std::vector<Vec3crd>;

+using Pointfs        = std::vector<Vec2d>;

+using Vec2ds         = std::vector<Vec2d>;

+using Pointf3s       = std::vector<Vec3d>;

+

+using Matrix2f       = Eigen::Matrix<float,  2, 2, Eigen::DontAlign>;

+using Matrix2d       = Eigen::Matrix<double, 2, 2, Eigen::DontAlign>;

+using Matrix3f       = Eigen::Matrix<float,  3, 3, Eigen::DontAlign>;

+using Matrix3d       = Eigen::Matrix<double, 3, 3, Eigen::DontAlign>;

+using Matrix4f       = Eigen::Matrix<float,  4, 4, Eigen::DontAlign>;

+using Matrix4d       = Eigen::Matrix<double, 4, 4, Eigen::DontAlign>;

+

+template<int N, class T>

+using Transform = Eigen::Transform<float, N, Eigen::Affine, Eigen::DontAlign>;

+

+using Transform2f    = Eigen::Transform<float,  2, Eigen::Affine, Eigen::DontAlign>;

+using Transform2d    = Eigen::Transform<double, 2, Eigen::Affine, Eigen::DontAlign>;

+using Transform3f    = Eigen::Transform<float,  3, Eigen::Affine, Eigen::DontAlign>;

+using Transform3d    = Eigen::Transform<double, 3, Eigen::Affine, Eigen::DontAlign>;

+

+// I don't know why Eigen::Transform::Identity() return a const object...

+template<int N, class T> Transform<N, T> identity() { return Transform<N, T>::Identity(); }

+inline const auto &identity3f = identity<3, float>;

+inline const auto &identity3d = identity<3, double>;

+

+inline bool operator<(const Vec2d &lhs, const Vec2d &rhs) { return lhs.x() < rhs.x() || (lhs.x() == rhs.x() && lhs.y() < rhs.y()); }

+

+// Cross product of two 2D vectors.

+// None of the vectors may be of int32_t type as the result would overflow.

+template<typename Derived, typename Derived2>

+inline typename Derived::Scalar cross2(const Eigen::MatrixBase<Derived> &v1, const Eigen::MatrixBase<Derived2> &v2)

+{

+    static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) == 2, "cross2(): first parameter is not a 2D vector");

+    static_assert(Derived2::IsVectorAtCompileTime && int(Derived2::SizeAtCompileTime) == 2, "cross2(): first parameter is not a 2D vector");

+    static_assert(! std::is_same<typename Derived::Scalar, int32_t>::value, "cross2(): Scalar type must not be int32_t, otherwise the cross product would overflow.");

+    static_assert(std::is_same<typename Derived::Scalar, typename Derived2::Scalar>::value, "cross2(): Scalar types of 1st and 2nd operand must be equal.");

+    return v1.x() * v2.y() - v1.y() * v2.x();

+}

+

+// 2D vector perpendicular to the argument.

+template<typename Derived>

+inline Eigen::Matrix<typename Derived::Scalar, 2, 1, Eigen::DontAlign> perp(const Eigen::MatrixBase<Derived> &v)

+{ 

+    static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) == 2, "perp(): parameter is not a 2D vector");

+    return { - v.y(), v.x() };

+}

+

+// Angle from v1 to v2, returning double atan2(y, x) normalized to <-PI, PI>.

+template<typename Derived, typename Derived2>

+inline double angle(const Eigen::MatrixBase<Derived> &v1, const Eigen::MatrixBase<Derived2> &v2) {

+    static_assert(Derived::IsVectorAtCompileTime && int(Derived::SizeAtCompileTime) == 2, "angle(): first parameter is not a 2D vector");

+    static_assert(Derived2::IsVectorAtCompileTime && int(Derived2::SizeAtCompileTime) == 2, "angle(): second parameter is not a 2D vector");

+    auto v1d = v1.template cast<double>();

+    auto v2d = v2.template cast<double>();

+    return atan2(cross2(v1d, v2d), v1d.dot(v2d));

+}

+

+template<class T, int N, int Options>

+Eigen::Matrix<T, 2, 1, Eigen::DontAlign> to_2d(const Eigen::MatrixBase<Eigen::Matrix<T, N, 1, Options>> &ptN) { return { ptN.x(), ptN.y() }; }

+

+template<class T, int Options>

+Eigen::Matrix<T, 3, 1, Eigen::DontAlign> to_3d(const Eigen::MatrixBase<Eigen::Matrix<T, 2, 1, Options>> & pt, const T z) { return { pt.x(), pt.y(), z }; }

+

+inline Vec2d   unscale(coord_t x, coord_t y) { return Vec2d(unscale<double>(x), unscale<double>(y)); }

+inline Vec2d   unscale(const Vec2crd &pt) { return Vec2d(unscale<double>(pt.x()), unscale<double>(pt.y())); }

+inline Vec2d   unscale(const Vec2d   &pt) { return Vec2d(unscale<double>(pt.x()), unscale<double>(pt.y())); }

+inline Vec3d   unscale(coord_t x, coord_t y, coord_t z) { return Vec3d(unscale<double>(x), unscale<double>(y), unscale<double>(z)); }

+inline Vec3d   unscale(const Vec3crd &pt) { return Vec3d(unscale<double>(pt.x()), unscale<double>(pt.y()), unscale<double>(pt.z())); }

+inline Vec3d   unscale(const Vec3d   &pt) { return Vec3d(unscale<double>(pt.x()), unscale<double>(pt.y()), unscale<double>(pt.z())); }

+

+inline std::string to_string(const Vec2crd &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + "]"; }

+inline std::string to_string(const Vec2d   &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + "]"; }

+inline std::string to_string(const Vec3crd &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + ", " + float_to_string_decimal_point(pt.z()) + "]"; }

+inline std::string to_string(const Vec3d   &pt) { return std::string("[") + float_to_string_decimal_point(pt.x()) + ", " + float_to_string_decimal_point(pt.y()) + ", " + float_to_string_decimal_point(pt.z()) + "]"; }

+

+std::vector<Vec3f> transform(const std::vector<Vec3f>& points, const Transform3f& t);

+Pointf3s transform(const Pointf3s& points, const Transform3d& t);

+

+template<int N, class T> using Vec = Eigen::Matrix<T,  N, 1, Eigen::DontAlign, N, 1>;

+

+class Point : public Vec2crd

+{

+public:

+    using coord_type = coord_t;

+

+    Point() : Vec2crd(0, 0) {}

+    Point(int32_t x, int32_t y) : Vec2crd(coord_t(x), coord_t(y)) {}

+    Point(int64_t x, int64_t y) : Vec2crd(coord_t(x), coord_t(y)) {}

+    Point(double x, double y) : Vec2crd(coord_t(lrint(x)), coord_t(lrint(y))) {}

+    Point(const Point &rhs) { *this = rhs; }

+	explicit Point(const Vec2d& rhs) : Vec2crd(coord_t(lrint(rhs.x())), coord_t(lrint(rhs.y()))) {}

+	// This constructor allows you to construct Point from Eigen expressions

+    template<typename OtherDerived>

+    Point(const Eigen::MatrixBase<OtherDerived> &other) : Vec2crd(other) {}

+    static Point new_scale(coordf_t x, coordf_t y) { return Point(coord_t(scale_(x)), coord_t(scale_(y))); }

+    static Point new_scale(const Vec2d &v) { return Point(coord_t(scale_(v.x())), coord_t(scale_(v.y()))); }

+    static Point new_scale(const Vec2f &v) { return Point(coord_t(scale_(v.x())), coord_t(scale_(v.y()))); }

+

+    // This method allows you to assign Eigen expressions to MyVectorType

+    template<typename OtherDerived>

+    Point& operator=(const Eigen::MatrixBase<OtherDerived> &other)

+    {

+        this->Vec2crd::operator=(other);

+        return *this;

+    }

+

+    Point& operator+=(const Point& rhs) { this->x() += rhs.x(); this->y() += rhs.y(); return *this; }

+    Point& operator-=(const Point& rhs) { this->x() -= rhs.x(); this->y() -= rhs.y(); return *this; }

+	Point& operator*=(const double &rhs) { this->x() = coord_t(this->x() * rhs); this->y() = coord_t(this->y() * rhs); return *this; }

+    Point operator*(const double &rhs) { return Point(this->x() * rhs, this->y() * rhs); }

+

+    void   rotate(double angle) { this->rotate(std::cos(angle), std::sin(angle)); }

+    void   rotate(double cos_a, double sin_a) {

+        double cur_x = (double)this->x();

+        double cur_y = (double)this->y();

+        this->x() = (coord_t)round(cos_a * cur_x - sin_a * cur_y);

+        this->y() = (coord_t)round(cos_a * cur_y + sin_a * cur_x);

+    }

+

+    void   rotate(double angle, const Point &center);

+    Point  rotated(double angle) const { Point res(*this); res.rotate(angle); return res; }

+    Point  rotated(double cos_a, double sin_a) const { Point res(*this); res.rotate(cos_a, sin_a); return res; }

+    Point  rotated(double angle, const Point &center) const { Point res(*this); res.rotate(angle, center); return res; }

+    int    nearest_point_index(const Points &points) const;

+    int    nearest_point_index(const PointConstPtrs &points) const;

+    int    nearest_point_index(const PointPtrs &points) const;

+    bool   nearest_point(const Points &points, Point* point) const;

+    Point  projection_onto(const MultiPoint &poly) const;

+    Point  projection_onto(const Line &line) const;

+};

+

+inline bool operator<(const Point &l, const Point &r) 

+{ 

+    return l.x() < r.x() || (l.x() == r.x() && l.y() < r.y());

+}

+

+inline Point operator* (const Point& l, const double &r)

+{

+    return {coord_t(l.x() * r), coord_t(l.y() * r)};

+}

+

+inline bool is_approx(const Point &p1, const Point &p2, coord_t epsilon = coord_t(SCALED_EPSILON))

+{

+	Point d = (p2 - p1).cwiseAbs();

+	return d.x() < epsilon && d.y() < epsilon;

+}

+

+inline bool is_approx(const Vec2f &p1, const Vec2f &p2, float epsilon = float(EPSILON))

+{

+	Vec2f d = (p2 - p1).cwiseAbs();

+	return d.x() < epsilon && d.y() < epsilon;

+}

+

+inline bool is_approx(const Vec2d &p1, const Vec2d &p2, double epsilon = EPSILON)

+{

+	Vec2d d = (p2 - p1).cwiseAbs();

+	return d.x() < epsilon && d.y() < epsilon;

+}

+

+inline bool is_approx(const Vec3f &p1, const Vec3f &p2, float epsilon = float(EPSILON))

+{

+	Vec3f d = (p2 - p1).cwiseAbs();

+	return d.x() < epsilon && d.y() < epsilon && d.z() < epsilon;

+}

+

+inline bool is_approx(const Vec3d &p1, const Vec3d &p2, double epsilon = EPSILON)

+{

+	Vec3d d = (p2 - p1).cwiseAbs();

+	return d.x() < epsilon && d.y() < epsilon && d.z() < epsilon;

+}

+

+inline Point lerp(const Point &a, const Point &b, double t)

+{

+    assert((t >= -EPSILON) && (t <= 1. + EPSILON));

+    return ((1. - t) * a.cast<double>() + t * b.cast<double>()).cast<coord_t>();

+}

+

+BoundingBox get_extents(const Points &pts);

+BoundingBox get_extents(const std::vector<Points> &pts);

+BoundingBoxf get_extents(const std::vector<Vec2d> &pts);

+

+// Test for duplicate points in a vector of points.

+// The points are copied, sorted and checked for duplicates globally.

+bool        has_duplicate_points(std::vector<Point> &&pts);

+inline bool has_duplicate_points(const std::vector<Point> &pts)

+{

+    std::vector<Point> cpy = pts;

+    return has_duplicate_points(std::move(cpy));

+}

+

+// Test for duplicate points in a vector of points.

+// Only successive points are checked for equality.

+inline bool has_duplicate_successive_points(const std::vector<Point> &pts)

+{

+    for (size_t i = 1; i < pts.size(); ++ i)

+        if (pts[i - 1] == pts[i])

+            return true;

+    return false;

+}

+

+// Test for duplicate points in a vector of points.

+// Only successive points are checked for equality. Additionally, first and last points are compared for equality.

+inline bool has_duplicate_successive_points_closed(const std::vector<Point> &pts)

+{

+    return has_duplicate_successive_points(pts) || (pts.size() >= 2 && pts.front() == pts.back());

+}

+

+namespace int128 {

+    // Exact orientation predicate,

+    // returns +1: CCW, 0: collinear, -1: CW.

+    int orient(const Vec2crd &p1, const Vec2crd &p2, const Vec2crd &p3);

+    // Exact orientation predicate,

+    // returns +1: CCW, 0: collinear, -1: CW.

+    int cross(const Vec2crd &v1, const Vec2crd &v2);

+}

+

+// To be used by std::unordered_map, std::unordered_multimap and friends.

+struct PointHash {

+    size_t operator()(const Vec2crd &pt) const {

+        return coord_t((89 * 31 + int64_t(pt.x())) * 31 + pt.y());

+    }

+};

+

+// A generic class to search for a closest Point in a given radius.

+// It uses std::unordered_multimap to implement an efficient 2D spatial hashing.

+// The PointAccessor has to return const Point*.

+// If a nullptr is returned, it is ignored by the query.

+template<typename ValueType, typename PointAccessor> class ClosestPointInRadiusLookup

+{

+public:

+    ClosestPointInRadiusLookup(coord_t search_radius, PointAccessor point_accessor = PointAccessor()) : 

+		m_search_radius(search_radius), m_point_accessor(point_accessor), m_grid_log2(0)

+    {

+        // Resolution of a grid, twice the search radius + some epsilon.

+		coord_t gridres = 2 * m_search_radius + 4;

+        m_grid_resolution = gridres;

+        assert(m_grid_resolution > 0);

+        assert(m_grid_resolution < (coord_t(1) << 30));

+		// Compute m_grid_log2 = log2(m_grid_resolution)

+		if (m_grid_resolution > 32767) {

+			m_grid_resolution >>= 16;

+			m_grid_log2 += 16;

+		}

+		if (m_grid_resolution > 127) {

+			m_grid_resolution >>= 8;

+			m_grid_log2 += 8;

+		}

+		if (m_grid_resolution > 7) {

+			m_grid_resolution >>= 4;

+			m_grid_log2 += 4;

+		}

+		if (m_grid_resolution > 1) {

+			m_grid_resolution >>= 2;

+			m_grid_log2 += 2;

+		}

+		if (m_grid_resolution > 0)

+			++ m_grid_log2;

+		m_grid_resolution = 1 << m_grid_log2;

+		assert(m_grid_resolution >= gridres);

+		assert(gridres > m_grid_resolution / 2);

+    }

+

+    void insert(const ValueType &value) {

+        const Vec2crd *pt = m_point_accessor(value);

+        if (pt != nullptr)

+            m_map.emplace(std::make_pair(Vec2crd(pt->x()>>m_grid_log2, pt->y()>>m_grid_log2), value));

+    }

+

+    void insert(ValueType &&value) {

+        const Vec2crd *pt = m_point_accessor(value);

+        if (pt != nullptr)

+            m_map.emplace(std::make_pair(Vec2crd(pt->x()>>m_grid_log2, pt->y()>>m_grid_log2), std::move(value)));

+    }

+

+    // Erase a data point equal to value. (ValueType has to declare the operator==).

+    // Returns true if the data point equal to value was found and removed.

+    bool erase(const ValueType &value) {

+        const Point *pt = m_point_accessor(value);

+        if (pt != nullptr) {

+            // Range of fragment starts around grid_corner, close to pt.

+            auto range = m_map.equal_range(Point((*pt).x()>>m_grid_log2, (*pt).y()>>m_grid_log2));

+            // Remove the first item.

+            for (auto it = range.first; it != range.second; ++ it) {

+                if (it->second == value) {

+                    m_map.erase(it);

+                    return true;

+                }

+            }

+        }

+        return false;

+    }

+

+    // Return a pair of <ValueType*, distance_squared>

+    std::pair<const ValueType*, double> find(const Vec2crd &pt) {

+        // Iterate over 4 closest grid cells around pt,

+        // find the closest start point inside these cells to pt.

+        const ValueType *value_min = nullptr;

+        double           dist_min = std::numeric_limits<double>::max();

+        // Round pt to a closest grid_cell corner.

+        Vec2crd            grid_corner((pt.x()+(m_grid_resolution>>1))>>m_grid_log2, (pt.y()+(m_grid_resolution>>1))>>m_grid_log2);

+        // For four neighbors of grid_corner:

+        for (coord_t neighbor_y = -1; neighbor_y < 1; ++ neighbor_y) {

+            for (coord_t neighbor_x = -1; neighbor_x < 1; ++ neighbor_x) {

+                // Range of fragment starts around grid_corner, close to pt.

+                auto range = m_map.equal_range(Vec2crd(grid_corner.x() + neighbor_x, grid_corner.y() + neighbor_y));

+                // Find the map entry closest to pt.

+                for (auto it = range.first; it != range.second; ++it) {

+                    const ValueType &value = it->second;

+                    const Vec2crd *pt2 = m_point_accessor(value);

+                    if (pt2 != nullptr) {

+                        const double d2 = (pt - *pt2).cast<double>().squaredNorm();

+                        if (d2 < dist_min) {

+                            dist_min = d2;

+                            value_min = &value;

+                        }

+                    }

+                }

+            }

+        }

+        return (value_min != nullptr && dist_min < coordf_t(m_search_radius) * coordf_t(m_search_radius)) ? 

+            std::make_pair(value_min, dist_min) : 

+            std::make_pair(nullptr, std::numeric_limits<double>::max());

+    }

+

+    // Returns all pairs of values and squared distances.

+    std::vector<std::pair<const ValueType*, double>> find_all(const Vec2crd &pt) {

+        // Iterate over 4 closest grid cells around pt,

+        // Round pt to a closest grid_cell corner.

+        Vec2crd      grid_corner((pt.x()+(m_grid_resolution>>1))>>m_grid_log2, (pt.y()+(m_grid_resolution>>1))>>m_grid_log2);

+        // For four neighbors of grid_corner:

+        std::vector<std::pair<const ValueType*, double>> out;

+        const double r2 = double(m_search_radius) * m_search_radius;

+        for (coord_t neighbor_y = -1; neighbor_y < 1; ++ neighbor_y) {

+            for (coord_t neighbor_x = -1; neighbor_x < 1; ++ neighbor_x) {

+                // Range of fragment starts around grid_corner, close to pt.

+                auto range = m_map.equal_range(Vec2crd(grid_corner.x() + neighbor_x, grid_corner.y() + neighbor_y));

+                // Find the map entry closest to pt.

+                for (auto it = range.first; it != range.second; ++it) {

+                    const ValueType &value = it->second;

+                    const Vec2crd *pt2 = m_point_accessor(value);

+                    if (pt2 != nullptr) {

+                        const double d2 = (pt - *pt2).cast<double>().squaredNorm();

+                        if (d2 <= r2)

+                            out.emplace_back(&value, d2);

+                    }

+                }

+            }

+        }

+        return out;

+    }

+

+private:

+    using map_type = typename std::unordered_multimap<Vec2crd, ValueType, PointHash>;

+    PointAccessor m_point_accessor;

+    map_type m_map;

+    coord_t  m_search_radius;

+    coord_t  m_grid_resolution;

+    coord_t  m_grid_log2;

+};

+

+std::ostream& operator<<(std::ostream &stm, const Vec2d &pointf);

+

+

+// /////////////////////////////////////////////////////////////////////////////

+// Type safe conversions to and from scaled and unscaled coordinates

+// /////////////////////////////////////////////////////////////////////////////

+

+// Semantics are the following:

+// Upscaling (scaled()): only from floating point types (or Vec) to either

+//                       floating point or integer 'scaled coord' coordinates.

+// Downscaling (unscaled()): from arithmetic (or Vec) to floating point only

+

+// Conversion definition from unscaled to floating point scaled

+template<class Tout,

+         class Tin,

+         class = FloatingOnly<Tin>>

+inline constexpr FloatingOnly<Tout> scaled(const Tin &v) noexcept

+{

+    return Tout(v / Tin(SCALING_FACTOR));

+}

+

+// Conversion definition from unscaled to integer 'scaled coord'.

+// TODO: is the rounding necessary? Here it is commented  out to show that

+// it can be different for integers but it does not have to be. Using

+// std::round means loosing noexcept and constexpr modifiers

+template<class Tout = coord_t, class Tin, class = FloatingOnly<Tin>>

+inline constexpr ScaledCoordOnly<Tout> scaled(const Tin &v) noexcept

+{

+    //return static_cast<Tout>(std::round(v / SCALING_FACTOR));

+    return Tout(v / Tin(SCALING_FACTOR));

+}

+

+// Conversion for Eigen vectors (N dimensional points)

+template<class Tout = coord_t,

+         class Tin,

+         int N,

+         class = FloatingOnly<Tin>,

+         int...EigenArgs>

+inline Eigen::Matrix<ArithmeticOnly<Tout>, N, EigenArgs...>

+scaled(const Eigen::Matrix<Tin, N, EigenArgs...> &v)

+{

+    return (v / SCALING_FACTOR).template cast<Tout>();

+}

+

+// Conversion from arithmetic scaled type to floating point unscaled

+template<class Tout = double,

+         class Tin,

+         class = ArithmeticOnly<Tin>,

+         class = FloatingOnly<Tout>>

+inline constexpr Tout unscaled(const Tin &v) noexcept

+{

+    return Tout(v) * Tout(SCALING_FACTOR);

+}

+

+// Unscaling for Eigen vectors. Input base type can be arithmetic, output base

+// type can only be floating point.

+template<class Tout = double,

+         class Tin,

+         int N,

+         class = ArithmeticOnly<Tin>,

+         class = FloatingOnly<Tout>,

+         int...EigenArgs>

+inline constexpr Eigen::Matrix<Tout, N, EigenArgs...>

+unscaled(const Eigen::Matrix<Tin, N, EigenArgs...> &v) noexcept

+{

+    return v.template cast<Tout>() * Tout(SCALING_FACTOR);

+}

+

+// Align a coordinate to a grid. The coordinate may be negative,

+// the aligned value will never be bigger than the original one.

+inline coord_t align_to_grid(const coord_t coord, const coord_t spacing) {

+    // Current C++ standard defines the result of integer division to be rounded to zero,

+    // for both positive and negative numbers. Here we want to round down for negative

+    // numbers as well.

+    coord_t aligned = (coord < 0) ?

+            ((coord - spacing + 1) / spacing) * spacing :

+            (coord / spacing) * spacing;

+    assert(aligned <= coord);

+    return aligned;

+}

+inline Point   align_to_grid(Point   coord, Point   spacing) 

+    { return Point(align_to_grid(coord.x(), spacing.x()), align_to_grid(coord.y(), spacing.y())); }

+inline coord_t align_to_grid(coord_t coord, coord_t spacing, coord_t base) 

+    { return base + align_to_grid(coord - base, spacing); }

+inline Point   align_to_grid(Point   coord, Point   spacing, Point   base)

+    { return Point(align_to_grid(coord.x(), spacing.x(), base.x()), align_to_grid(coord.y(), spacing.y(), base.y())); }

+

+} // namespace Slic3r

+

+// start Boost

+#include <boost/version.hpp>

+#include <boost/polygon/polygon.hpp>

+namespace boost { namespace polygon {

+    template <>

+    struct geometry_concept<Slic3r::Point> { using type = point_concept; };

+   

+    template <>

+    struct point_traits<Slic3r::Point> {

+        using coordinate_type = coord_t;

+    

+        static inline coordinate_type get(const Slic3r::Point& point, orientation_2d orient) {

+            return static_cast<coordinate_type>(point((orient == HORIZONTAL) ? 0 : 1));

+        }

+    };

+    

+    template <>

+    struct point_mutable_traits<Slic3r::Point> {

+        using coordinate_type = coord_t;

+        static inline void set(Slic3r::Point& point, orientation_2d orient, coord_t value) {

+            point((orient == HORIZONTAL) ? 0 : 1) = value;

+        }

+        static inline Slic3r::Point construct(coord_t x_value, coord_t y_value) {

+            return Slic3r::Point(x_value, y_value);

+        }

+    };

+} }

+// end Boost

+

+// Serialization through the Cereal library

+namespace cereal {

+//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2crd &v) { archive(v.x(), v.y()); }

+//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3crd &v) { archive(v.x(), v.y(), v.z()); }

+	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2i   &v) { archive(v.x(), v.y()); }

+	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3i   &v) { archive(v.x(), v.y(), v.z()); }

+//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2i64 &v) { archive(v.x(), v.y()); }

+//	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3i64 &v) { archive(v.x(), v.y(), v.z()); }

+	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2f   &v) { archive(v.x(), v.y()); }

+	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3f   &v) { archive(v.x(), v.y(), v.z()); }

+	template<class Archive> void serialize(Archive& archive, Slic3r::Vec2d   &v) { archive(v.x(), v.y()); }

+	template<class Archive> void serialize(Archive& archive, Slic3r::Vec3d   &v) { archive(v.x(), v.y(), v.z()); }

+

+	template<class Archive> void load(Archive& archive, Slic3r::Matrix2f &m) { archive.loadBinary((char*)m.data(), sizeof(float) * 4); }

+	template<class Archive> void save(Archive& archive, Slic3r::Matrix2f &m) { archive.saveBinary((char*)m.data(), sizeof(float) * 4); }

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    template<class Archive> void load(Archive& archive, Slic3r::Transform3d& m)       { archive.loadBinary((char*)m.data(), sizeof(double) * 16); }

+    template<class Archive> void save(Archive& archive, const Slic3r::Transform3d& m) { archive.saveBinary((char*)m.data(), sizeof(double) * 16); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+}

+

+// To be able to use Vec<> and Mat<> in range based for loops:

+namespace Eigen {

+template<class T, int N, int M>

+T* begin(Slic3r::Mat<N, M, T> &mat) { return mat.data(); }

+

+template<class T, int N, int M>

+T* end(Slic3r::Mat<N, M, T> &mat) { return mat.data() + N * M; }

+

+template<class T, int N, int M>

+const T* begin(const Slic3r::Mat<N, M, T> &mat) { return mat.data(); }

+

+template<class T, int N, int M>

+const T* end(const Slic3r::Mat<N, M, T> &mat) { return mat.data() + N * M; }

+} // namespace Eigen

+

+#endif

diff --git a/src/libslic3r/PrintApply.cpp b/src/libslic3r/PrintApply.cpp
index 34e3129d9..b88ae9e50 100644
--- a/src/libslic3r/PrintApply.cpp
+++ b/src/libslic3r/PrintApply.cpp
@@ -1,1444 +1,1453 @@
-#include "Model.hpp"
-#include "Print.hpp"
-
-#include <cfloat>
-
-namespace Slic3r {
-
-// Add or remove support modifier ModelVolumes from model_object_dst to match the ModelVolumes of model_object_new
-// in the exact order and with the same IDs.
-// It is expected, that the model_object_dst already contains the non-support volumes of model_object_new in the correct order.
-// Friend to ModelVolume to allow copying.
-// static is not accepted by gcc if declared as a friend of ModelObject.
-/* static */ void model_volume_list_update_supports(ModelObject &model_object_dst, const ModelObject &model_object_new)
-{
-    typedef std::pair<const ModelVolume*, bool> ModelVolumeWithStatus;
-    std::vector<ModelVolumeWithStatus> old_volumes;
-    old_volumes.reserve(model_object_dst.volumes.size());
-    for (const ModelVolume *model_volume : model_object_dst.volumes)
-        old_volumes.emplace_back(ModelVolumeWithStatus(model_volume, false));
-    auto model_volume_lower = [](const ModelVolumeWithStatus &mv1, const ModelVolumeWithStatus &mv2){ return mv1.first->id() <  mv2.first->id(); };
-    auto model_volume_equal = [](const ModelVolumeWithStatus &mv1, const ModelVolumeWithStatus &mv2){ return mv1.first->id() == mv2.first->id(); };
-    std::sort(old_volumes.begin(), old_volumes.end(), model_volume_lower);
-    model_object_dst.volumes.clear();
-    model_object_dst.volumes.reserve(model_object_new.volumes.size());
-    for (const ModelVolume *model_volume_src : model_object_new.volumes) {
-        ModelVolumeWithStatus key(model_volume_src, false);
-        auto it = std::lower_bound(old_volumes.begin(), old_volumes.end(), key, model_volume_lower);
-        if (it != old_volumes.end() && model_volume_equal(*it, key)) {
-            // The volume was found in the old list. Just copy it.
-            assert(! it->second); // not consumed yet
-            it->second = true;
-            ModelVolume *model_volume_dst = const_cast<ModelVolume*>(it->first);
-            // For support modifiers, the type may have been switched from blocker to enforcer and vice versa.
-            assert((model_volume_dst->is_support_modifier() && model_volume_src->is_support_modifier()) || model_volume_dst->type() == model_volume_src->type());
-            model_object_dst.volumes.emplace_back(model_volume_dst);
-            if (model_volume_dst->is_support_modifier()) {
-                // For support modifiers, the type may have been switched from blocker to enforcer and vice versa.
-                model_volume_dst->set_type(model_volume_src->type());
-                model_volume_dst->set_transformation(model_volume_src->get_transformation());
-            }
-            assert(model_volume_dst->get_matrix().isApprox(model_volume_src->get_matrix()));
-        } else {
-            // The volume was not found in the old list. Create a new copy.
-            assert(model_volume_src->is_support_modifier());
-            model_object_dst.volumes.emplace_back(new ModelVolume(*model_volume_src));
-            model_object_dst.volumes.back()->set_model_object(&model_object_dst);
-        }
-    }
-    // Release the non-consumed old volumes (those were deleted from the new list).
-    for (ModelVolumeWithStatus &mv_with_status : old_volumes)
-        if (! mv_with_status.second)
-            delete mv_with_status.first;
-}
-
-static inline void model_volume_list_copy_configs(ModelObject &model_object_dst, const ModelObject &model_object_src, const ModelVolumeType type)
-{
-    size_t i_src, i_dst;
-    for (i_src = 0, i_dst = 0; i_src < model_object_src.volumes.size() && i_dst < model_object_dst.volumes.size();) {
-        const ModelVolume &mv_src = *model_object_src.volumes[i_src];
-        ModelVolume       &mv_dst = *model_object_dst.volumes[i_dst];
-        if (mv_src.type() != type) {
-            ++ i_src;
-            continue;
-        }
-        if (mv_dst.type() != type) {
-            ++ i_dst;
-            continue;
-        }
-        assert(mv_src.id() == mv_dst.id());
-        // Copy the ModelVolume data.
-        mv_dst.name   = mv_src.name;
-		mv_dst.config.assign_config(mv_src.config);
-        assert(mv_dst.supported_facets.id() == mv_src.supported_facets.id());
-        mv_dst.supported_facets.assign(mv_src.supported_facets);
-        assert(mv_dst.seam_facets.id() == mv_src.seam_facets.id());
-        mv_dst.seam_facets.assign(mv_src.seam_facets);
-        assert(mv_dst.mmu_segmentation_facets.id() == mv_src.mmu_segmentation_facets.id());
-        mv_dst.mmu_segmentation_facets.assign(mv_src.mmu_segmentation_facets);
-        //FIXME what to do with the materials?
-        // mv_dst.m_material_id = mv_src.m_material_id;
-        ++ i_src;
-        ++ i_dst;
-    }
-}
-
-static inline void layer_height_ranges_copy_configs(t_layer_config_ranges &lr_dst, const t_layer_config_ranges &lr_src)
-{
-    assert(lr_dst.size() == lr_src.size());
-    auto it_src = lr_src.cbegin();
-    for (auto &kvp_dst : lr_dst) {
-        const auto &kvp_src = *it_src ++;
-        assert(std::abs(kvp_dst.first.first  - kvp_src.first.first ) <= EPSILON);
-        assert(std::abs(kvp_dst.first.second - kvp_src.first.second) <= EPSILON);
-        // Layer heights are allowed do differ in case the layer height table is being overriden by the smooth profile.
-        // assert(std::abs(kvp_dst.second.option("layer_height")->getFloat() - kvp_src.second.option("layer_height")->getFloat()) <= EPSILON);
-        kvp_dst.second = kvp_src.second;
-    }
-}
-
-static inline bool transform3d_lower(const Transform3d &lhs, const Transform3d &rhs) 
-{
-    typedef Transform3d::Scalar T;
-    const T *lv = lhs.data();
-    const T *rv = rhs.data();
-    for (size_t i = 0; i < 16; ++ i, ++ lv, ++ rv) {
-        if (*lv < *rv)
-            return true;
-        else if (*lv > *rv)
-            return false;
-    }
-    return false;
-}
-
-static inline bool transform3d_equal(const Transform3d &lhs, const Transform3d &rhs) 
-{
-    typedef Transform3d::Scalar T;
-    const T *lv = lhs.data();
-    const T *rv = rhs.data();
-    for (size_t i = 0; i < 16; ++ i, ++ lv, ++ rv)
-        if (*lv != *rv)
-            return false;
-    return true;
-}
-
-struct PrintObjectTrafoAndInstances
-{
-    Transform3d    	trafo;
-    PrintInstances	instances;
-    bool operator<(const PrintObjectTrafoAndInstances &rhs) const { return transform3d_lower(this->trafo, rhs.trafo); }
-};
-
-// Generate a list of trafos and XY offsets for instances of a ModelObject
-static std::vector<PrintObjectTrafoAndInstances> print_objects_from_model_object(const ModelObject &model_object)
-{
-    std::set<PrintObjectTrafoAndInstances> trafos;
-    PrintObjectTrafoAndInstances           trafo;
-    for (ModelInstance *model_instance : model_object.instances)
-        if (model_instance->is_printable()) {
-            trafo.trafo = model_instance->get_matrix();
-            auto shift = Point::new_scale(trafo.trafo.data()[12], trafo.trafo.data()[13]);
-            // Reset the XY axes of the transformation.
-            trafo.trafo.data()[12] = 0;
-            trafo.trafo.data()[13] = 0;
-            // Search or insert a trafo.
-            auto it = trafos.emplace(trafo).first;
-            const_cast<PrintObjectTrafoAndInstances&>(*it).instances.emplace_back(PrintInstance{ nullptr, model_instance, shift });
-        }
-    return std::vector<PrintObjectTrafoAndInstances>(trafos.begin(), trafos.end());
-}
-
-// Compare just the layer ranges and their layer heights, not the associated configs.
-// Ignore the layer heights if check_layer_heights is false.
-static bool layer_height_ranges_equal(const t_layer_config_ranges &lr1, const t_layer_config_ranges &lr2, bool check_layer_height)
-{
-    if (lr1.size() != lr2.size())
-        return false;
-    auto it2 = lr2.begin();
-    for (const auto &kvp1 : lr1) {
-        const auto &kvp2 = *it2 ++;
-        if (std::abs(kvp1.first.first  - kvp2.first.first ) > EPSILON ||
-            std::abs(kvp1.first.second - kvp2.first.second) > EPSILON ||
-            (check_layer_height && std::abs(kvp1.second.option("layer_height")->getFloat() - kvp2.second.option("layer_height")->getFloat()) > EPSILON))
-            return false;
-    }
-    return true;
-}
-
-// Returns true if va == vb when all CustomGCode items that are not ToolChangeCode are ignored.
-static bool custom_per_printz_gcodes_tool_changes_differ(const std::vector<CustomGCode::Item> &va, const std::vector<CustomGCode::Item> &vb)
-{
-	auto it_a = va.begin();
-	auto it_b = vb.begin();
-	while (it_a != va.end() || it_b != vb.end()) {
-		if (it_a != va.end() && it_a->type != CustomGCode::ToolChange) {
-			// Skip any CustomGCode items, which are not tool changes.
-			++ it_a;
-			continue;
-		}
-		if (it_b != vb.end() && it_b->type != CustomGCode::ToolChange) {
-			// Skip any CustomGCode items, which are not tool changes.
-			++ it_b;
-			continue;
-		}
-		if (it_a == va.end() || it_b == vb.end())
-			// va or vb contains more Tool Changes than the other.
-			return true;
-		assert(it_a->type == CustomGCode::ToolChange);
-		assert(it_b->type == CustomGCode::ToolChange);
-		if (*it_a != *it_b)
-			// The two Tool Changes differ.
-			return true;
-		++ it_a;
-		++ it_b;
-	}
-	// There is no change in custom Tool Changes.
-	return false;
-}
-
-// Collect changes to print config, account for overrides of extruder retract values by filament presets.
-static t_config_option_keys print_config_diffs(
-    const PrintConfig        &current_config,
-    const DynamicPrintConfig &new_full_config,
-    DynamicPrintConfig       &filament_overrides)
-{
-    const std::vector<std::string> &extruder_retract_keys = print_config_def.extruder_retract_keys();
-    const std::string               filament_prefix       = "filament_";
-    t_config_option_keys            print_diff;
-    for (const t_config_option_key &opt_key : current_config.keys()) {
-        const ConfigOption *opt_old = current_config.option(opt_key);
-        assert(opt_old != nullptr);
-        const ConfigOption *opt_new = new_full_config.option(opt_key);
-        // assert(opt_new != nullptr);
-        if (opt_new == nullptr)
-            //FIXME This may happen when executing some test cases.
-            continue;
-        const ConfigOption *opt_new_filament = std::binary_search(extruder_retract_keys.begin(), extruder_retract_keys.end(), opt_key) ? new_full_config.option(filament_prefix + opt_key) : nullptr;
-        if (opt_new_filament != nullptr && ! opt_new_filament->is_nil()) {
-            // An extruder retract override is available at some of the filament presets.
-            bool overriden = opt_new->overriden_by(opt_new_filament);
-            if (overriden || *opt_old != *opt_new) {
-                auto opt_copy = opt_new->clone();
-                opt_copy->apply_override(opt_new_filament);
-                bool changed = *opt_old != *opt_copy;
-                if (changed)
-                    print_diff.emplace_back(opt_key);
-                if (changed || overriden) {
-                    // filament_overrides will be applied to the placeholder parser, which layers these parameters over full_print_config.
-                    filament_overrides.set_key_value(opt_key, opt_copy);
-                } else
-                    delete opt_copy;
-            }
-        } else if (*opt_new != *opt_old)
-            print_diff.emplace_back(opt_key);
-    }
-
-    return print_diff;
-}
-
-// Prepare for storing of the full print config into new_full_config to be exported into the G-code and to be used by the PlaceholderParser.
-static t_config_option_keys full_print_config_diffs(const DynamicPrintConfig &current_full_config, const DynamicPrintConfig &new_full_config)
-{
-    t_config_option_keys full_config_diff;
-    for (const t_config_option_key &opt_key : new_full_config.keys()) {
-        const ConfigOption *opt_old = current_full_config.option(opt_key);
-        const ConfigOption *opt_new = new_full_config.option(opt_key);
-        if (opt_old == nullptr || *opt_new != *opt_old)
-            full_config_diff.emplace_back(opt_key);
-    }
-    return full_config_diff;
-}
-
-// Repository for solving partial overlaps of ModelObject::layer_config_ranges.
-// Here the const DynamicPrintConfig* point to the config in ModelObject::layer_config_ranges.
-class LayerRanges
-{
-public:
-    struct LayerRange {
-        t_layer_height_range        layer_height_range;
-        // Config is owned by the associated ModelObject.
-        const DynamicPrintConfig*   config { nullptr };
-
-        bool operator<(const LayerRange &rhs) const throw() { return this->layer_height_range < rhs.layer_height_range; }
-    };
-
-    LayerRanges() = default;
-    LayerRanges(const t_layer_config_ranges &in) { this->assign(in); }
-
-    // Convert input config ranges into continuous non-overlapping sorted vector of intervals and their configs.
-    void assign(const t_layer_config_ranges &in) {
-        m_ranges.clear();
-        m_ranges.reserve(in.size());
-        // Input ranges are sorted lexicographically. First range trims the other ranges.
-        coordf_t last_z = 0;
-        for (const std::pair<const t_layer_height_range, ModelConfig> &range : in)
-            if (range.first.second > last_z) {
-                coordf_t min_z = std::max(range.first.first, 0.);
-                if (min_z > last_z + EPSILON) {
-                    m_ranges.push_back({ t_layer_height_range(last_z, min_z) });
-                    last_z = min_z;
-                }
-                if (range.first.second > last_z + EPSILON) {
-                    const DynamicPrintConfig *cfg = &range.second.get();
-                    m_ranges.push_back({ t_layer_height_range(last_z, range.first.second), cfg });
-                    last_z = range.first.second;
-                }
-            }
-        if (m_ranges.empty())
-            m_ranges.push_back({ t_layer_height_range(0, DBL_MAX) });
-        else if (m_ranges.back().config == nullptr)
-            m_ranges.back().layer_height_range.second = DBL_MAX;
-        else
-            m_ranges.push_back({ t_layer_height_range(m_ranges.back().layer_height_range.second, DBL_MAX) });
-    }
-
-    const DynamicPrintConfig* config(const t_layer_height_range &range) const {
-        auto it = std::lower_bound(m_ranges.begin(), m_ranges.end(), LayerRange{ { range.first - EPSILON, range.second - EPSILON } });
-        // #ys_FIXME_COLOR
-        // assert(it != m_ranges.end());
-        // assert(it == m_ranges.end() || std::abs(it->first.first  - range.first ) < EPSILON);
-        // assert(it == m_ranges.end() || std::abs(it->first.second - range.second) < EPSILON);
-        if (it == m_ranges.end() ||
-            std::abs(it->layer_height_range.first - range.first) > EPSILON ||
-            std::abs(it->layer_height_range.second - range.second) > EPSILON )
-            return nullptr; // desired range doesn't found
-        return it == m_ranges.end() ? nullptr : it->config;
-    }
-
-    std::vector<LayerRange>::const_iterator begin() const { return m_ranges.cbegin(); }
-    std::vector<LayerRange>::const_iterator end  () const { return m_ranges.cend(); }
-    size_t                                  size () const { return m_ranges.size(); }
-
-private:
-    // Layer ranges with their config overrides and list of volumes with their snug bounding boxes in a given layer range.
-    std::vector<LayerRange>  m_ranges;
-};
-
-// To track Model / ModelObject updates between the front end and back end, including layer height ranges, their configs,
-// and snug bounding boxes of ModelVolumes.
-struct ModelObjectStatus {
-    enum Status {
-        Unknown,
-        Old,
-        New,
-        Moved,
-        Deleted,
-    };
-
-    enum class PrintObjectRegionsStatus {
-        Invalid,
-        Valid,
-        PartiallyValid,
-    };
-
-    ModelObjectStatus(ObjectID id, Status status = Unknown) : id(id), status(status) {}
-    ~ModelObjectStatus() { if (print_object_regions) print_object_regions->ref_cnt_dec(); }
-
-    // Key of the set.
-    ObjectID                                    id;
-    // Status of this ModelObject with id on apply().
-    Status                                      status;
-    // PrintObjects to be generated for this ModelObject including their base transformation.
-    std::vector<PrintObjectTrafoAndInstances>   print_instances;
-    // Regions shared by the associated PrintObjects.
-    PrintObjectRegions                         *print_object_regions { nullptr };
-    // Status of the above.
-    PrintObjectRegionsStatus                    print_object_regions_status { PrintObjectRegionsStatus::Invalid };
-
-    // Search by id.
-    bool operator<(const ModelObjectStatus &rhs) const { return id < rhs.id; }
-};
-
-struct ModelObjectStatusDB
-{
-    void add(const ModelObject &model_object, const ModelObjectStatus::Status status) {
-        assert(db.find(ModelObjectStatus(model_object.id())) == db.end());
-        db.emplace(model_object.id(), status);
-    }
-
-    bool add_if_new(const ModelObject &model_object, const ModelObjectStatus::Status status) {
-        auto it = db.find(ModelObjectStatus(model_object.id()));
-        if (it == db.end()) {
-            db.emplace_hint(it, model_object.id(), status);
-            return true;
-        }
-        return false;
-    }
-
-    const ModelObjectStatus& get(const ModelObject &model_object) {
-        auto it = db.find(ModelObjectStatus(model_object.id()));
-        assert(it != db.end());
-        return *it;
-    }
-
-    const ModelObjectStatus& reuse(const ModelObject &model_object) {
-        const ModelObjectStatus &result = this->get(model_object);
-        assert(result.status != ModelObjectStatus::Deleted);
-        return result;
-    }
-
-    std::set<ModelObjectStatus> db;
-};
-
-struct PrintObjectStatus {
-    enum Status {
-        Unknown,
-        Deleted,
-        Reused,
-        New
-    };
-
-    PrintObjectStatus(PrintObject *print_object, Status status = Unknown) : 
-        id(print_object->model_object()->id()),
-        print_object(print_object),
-        trafo(print_object->trafo()),
-        status(status) {}
-    PrintObjectStatus(ObjectID id) : id(id), print_object(nullptr), trafo(Transform3d::Identity()), status(Unknown) {}
-
-    // ID of the ModelObject & PrintObject
-    ObjectID         id;
-    // Pointer to the old PrintObject
-    PrintObject     *print_object;
-    // Trafo generated with model_object->world_matrix(true) 
-    Transform3d      trafo;
-    Status           status;
-
-    // Search by id.
-    bool operator<(const PrintObjectStatus &rhs) const { return id < rhs.id; }
-};
-
-class PrintObjectStatusDB {
-public:
-    using iterator          = std::multiset<PrintObjectStatus>::iterator;
-    using const_iterator    = std::multiset<PrintObjectStatus>::const_iterator;
-
-    PrintObjectStatusDB(const PrintObjectPtrs &print_objects) {
-        for (PrintObject *print_object : print_objects)
-            m_db.emplace(PrintObjectStatus(print_object));
-    }
-
-    struct iterator_range : std::pair<const_iterator, const_iterator>
-    { 
-        using std::pair<const_iterator, const_iterator>::pair;
-        iterator_range(const std::pair<const_iterator, const_iterator> in) : std::pair<const_iterator, const_iterator>(in) {}
-
-        const_iterator begin() throw() { return this->first; }
-        const_iterator end() throw() { return this->second; }
-    };
-
-    iterator_range get_range(const ModelObject &model_object) const {
-        return m_db.equal_range(PrintObjectStatus(model_object.id()));
-    }
-
-    iterator_range get_range(const ModelObjectStatus &model_object_status) const {
-        return m_db.equal_range(PrintObjectStatus(model_object_status.id));
-    }
-
-    size_t count(const ModelObject &model_object) {
-        return m_db.count(PrintObjectStatus(model_object.id()));
-    }
-
-    std::multiset<PrintObjectStatus>::iterator begin() { return m_db.begin(); }
-    std::multiset<PrintObjectStatus>::iterator end()   { return m_db.end(); }
-
-    void clear() {
-        m_db.clear();
-    }
-
-private:
-    std::multiset<PrintObjectStatus> m_db;
-};
-
-static inline bool model_volume_solid_or_modifier(const ModelVolume &mv)
-{
-    ModelVolumeType type = mv.type();
-    return type == ModelVolumeType::MODEL_PART || type == ModelVolumeType::NEGATIVE_VOLUME || type == ModelVolumeType::PARAMETER_MODIFIER;
-}
-
-static inline Transform3f trafo_for_bbox(const Transform3d &object_trafo, const Transform3d &volume_trafo)
-{
-    Transform3d m = object_trafo * volume_trafo;
-    m.translation().x() = 0.;
-    m.translation().y() = 0.;
-    return m.cast<float>();
-}
-
-static inline bool trafos_differ_in_rotation_by_z_and_mirroring_by_xy_only(const Transform3d &t1, const Transform3d &t2)
-{
-    if (std::abs(t1.translation().z() - t2.translation().z()) > EPSILON)
-        // One of the object is higher than the other above the build plate (or below the build plate).
-        return false;
-    Matrix3d m1 = t1.matrix().block<3, 3>(0, 0);
-    Matrix3d m2 = t2.matrix().block<3, 3>(0, 0);
-    Matrix3d m = m2.inverse() * m1;
-    Vec3d    z = m.block<3, 1>(0, 2);
-    if (std::abs(z.x()) > EPSILON || std::abs(z.y()) > EPSILON || std::abs(z.z() - 1.) > EPSILON)
-        // Z direction or length changed.
-        return false;
-    // Z still points in the same direction and it has the same length.
-    Vec3d    x = m.block<3, 1>(0, 0);
-    Vec3d    y = m.block<3, 1>(0, 1);
-    if (std::abs(x.z()) > EPSILON || std::abs(y.z()) > EPSILON)
-        return false;
-    double   lx2 = x.squaredNorm();
-    double   ly2 = y.squaredNorm();
-    if (lx2 - 1. > EPSILON * EPSILON || ly2 - 1. > EPSILON * EPSILON)
-        return false;
-    // Verify whether the vectors x, y are still perpendicular.
-    double   d   = x.dot(y);
-    return std::abs(d * d) < EPSILON * lx2 * ly2;
-}
-
-static PrintObjectRegions::BoundingBox transformed_its_bbox2d(const indexed_triangle_set &its, const Transform3f &m, float offset)
-{
-    assert(! its.indices.empty());
-
-    PrintObjectRegions::BoundingBox bbox(m * its.vertices[its.indices.front()(0)]);
-    for (const stl_triangle_vertex_indices &tri : its.indices)
-        for (int i = 0; i < 3; ++ i)
-            bbox.extend(m * its.vertices[tri(i)]);
-    bbox.min() -= Vec3f(offset, offset, float(EPSILON));
-    bbox.max() += Vec3f(offset, offset, float(EPSILON));
-    return bbox;
-}
-
-static void transformed_its_bboxes_in_z_ranges(
-    const indexed_triangle_set                                    &its, 
-    const Transform3f                                             &m,
-    const std::vector<t_layer_height_range>                       &z_ranges,
-    std::vector<std::pair<PrintObjectRegions::BoundingBox, bool>> &bboxes,
-    const float                                                    offset)
-{
-    bboxes.assign(z_ranges.size(), std::make_pair(PrintObjectRegions::BoundingBox(), false));
-    for (const stl_triangle_vertex_indices &tri : its.indices) {
-        const Vec3f pts[3] = { m * its.vertices[tri(0)], m * its.vertices[tri(1)], m * its.vertices[tri(2)] };
-        for (size_t irange = 0; irange < z_ranges.size(); ++ irange) {
-            const t_layer_height_range                       &z_range = z_ranges[irange];
-            std::pair<PrintObjectRegions::BoundingBox, bool> &bbox    = bboxes[irange];
-            auto bbox_extend = [&bbox](const Vec3f& p) {
-                if (bbox.second) {
-                    bbox.first.extend(p);
-                } else {
-                    bbox.first.min() = bbox.first.max() = p;
-                    bbox.second = true;
-                }
-            };
-            int iprev = 2;
-            for (int iedge = 0; iedge < 3; ++ iedge) {
-                const Vec3f *p1 = &pts[iprev];
-                const Vec3f *p2 = &pts[iedge];
-                // Sort the edge points by Z.
-                if (p1->z() > p2->z())
-                    std::swap(p1, p2);
-                if (p2->z() <= z_range.first || p1->z() >= z_range.second) {
-                    // Out of this slab.
-                } else if (p1->z() < z_range.first) {
-                    if (p1->z() > z_range.second) {
-                        // Two intersections.
-                        float zspan = p2->z() - p1->z();
-                        float t1 = (z_range.first - p1->z())  / zspan;
-                        float t2 = (z_range.second - p1->z()) / zspan;
-                        Vec2f p = to_2d(*p1);
-                        Vec2f v(p2->x() - p1->x(), p2->y() - p1->y());
-                        bbox_extend(to_3d((p + v * t1).eval(), float(z_range.first)));
-                        bbox_extend(to_3d((p + v * t2).eval(), float(z_range.second)));
-                    } else {
-                        // Single intersection with the lower limit.
-                        float t = (z_range.first - p1->z()) / (p2->z() - p1->z());
-                        Vec2f v(p2->x() - p1->x(), p2->y() - p1->y());
-                        bbox_extend(to_3d((to_2d(*p1) + v * t).eval(), float(z_range.first)));
-                        bbox_extend(*p2);
-                    }
-                } else if (p2->z() > z_range.second) {
-                    // Single intersection with the upper limit.
-                    float t = (z_range.second - p1->z()) / (p2->z() - p1->z());
-                    Vec2f v(p2->x() - p1->x(), p2->y() - p1->y());
-                    bbox_extend(to_3d((to_2d(*p1) + v * t).eval(), float(z_range.second)));
-                    bbox_extend(*p1);
-                } else {
-                    // Both points are inside.
-                    bbox_extend(*p1);
-                    bbox_extend(*p2);
-                }
-                iprev = iedge;
-            }
-        }
-    }
-
-    for (std::pair<PrintObjectRegions::BoundingBox, bool> &bbox : bboxes) {
-        bbox.first.min() -= Vec3f(offset, offset, float(EPSILON));
-        bbox.first.max() += Vec3f(offset, offset, float(EPSILON));
-    }
-}
-
-// Last PrintObject for this print_object_regions has been fully invalidated (deleted).
-// Keep print_object_regions, but delete those volumes, which were either removed from new_volumes, or which rotated or scaled, so they need
-// their bounding boxes to be recalculated.
-void print_objects_regions_invalidate_keep_some_volumes(PrintObjectRegions &print_object_regions, ModelVolumePtrs old_volumes, ModelVolumePtrs new_volumes)
-{
-    print_object_regions.all_regions.clear();
-
-    model_volumes_sort_by_id(old_volumes);
-    model_volumes_sort_by_id(new_volumes);
-
-    size_t i_cached_volume      = 0;
-    size_t last_cached_volume   = 0;
-    size_t i_old                = 0;
-    for (size_t i_new = 0; i_new < new_volumes.size(); ++ i_new)
-        if (model_volume_solid_or_modifier(*new_volumes[i_new])) {
-            for (; i_old < old_volumes.size(); ++ i_old)
-                if (old_volumes[i_old]->id() >= new_volumes[i_new]->id())
-                    break;
-            if (i_old != old_volumes.size() && old_volumes[i_old]->id() == new_volumes[i_new]->id()) {
-                if (old_volumes[i_old]->get_matrix().isApprox(new_volumes[i_new]->get_matrix())) {
-                    // Reuse the volume.
-                    for (; print_object_regions.cached_volume_ids[i_cached_volume] < old_volumes[i_old]->id(); ++ i_cached_volume)
-                        assert(i_cached_volume < print_object_regions.cached_volume_ids.size());
-                    assert(i_cached_volume < print_object_regions.cached_volume_ids.size() && print_object_regions.cached_volume_ids[i_cached_volume] == old_volumes[i_old]->id());
-                    print_object_regions.cached_volume_ids[last_cached_volume ++] = print_object_regions.cached_volume_ids[i_cached_volume ++];
-                } else {
-                    // Don't reuse the volume.
-                }
-            }
-        }
-    print_object_regions.cached_volume_ids.erase(print_object_regions.cached_volume_ids.begin() + last_cached_volume, print_object_regions.cached_volume_ids.end());
-}
-
-// Find a bounding box of a volume's part intersecting layer_range. Such a bounding box will likely be smaller in XY than the full bounding box,
-// thus it will intersect with lower number of other volumes.
-const PrintObjectRegions::BoundingBox* find_volume_extents(const PrintObjectRegions::LayerRangeRegions &layer_range, const ModelVolume &volume)
-{
-    auto it = lower_bound_by_predicate(layer_range.volumes.begin(), layer_range.volumes.end(), [&volume](const PrintObjectRegions::VolumeExtents &l){ return l.volume_id < volume.id(); });
-    return it != layer_range.volumes.end() && it->volume_id == volume.id() ? &it->bbox : nullptr;
-}
-
-// Find a bounding box of a topmost printable volume referenced by this modifier given this_region_id.
-PrintObjectRegions::BoundingBox find_modifier_volume_extents(const PrintObjectRegions::LayerRangeRegions &layer_range, const int this_region_id)
-{
-    // Find the top-most printable volume of this modifier, or the printable volume itself.
-    const PrintObjectRegions::VolumeRegion &this_region = layer_range.volume_regions[this_region_id];
-    const PrintObjectRegions::BoundingBox *this_extents = find_volume_extents(layer_range, *this_region.model_volume);
-    assert(this_extents);
-    PrintObjectRegions::BoundingBox out { *this_extents };
-    if (! this_region.model_volume->is_model_part())
-        for (int parent_region_id = this_region.parent;;) {
-            assert(parent_region_id >= 0);
-            const PrintObjectRegions::VolumeRegion &parent_region  = layer_range.volume_regions[parent_region_id];
-            const PrintObjectRegions::BoundingBox  *parent_extents = find_volume_extents(layer_range, *parent_region.model_volume);
-            assert(parent_extents);
-            out.extend(*parent_extents);
-            if (parent_region.model_volume->is_model_part())
-                break;
-            parent_region_id = parent_region.parent;
-        }
-    return out;
-}
-
-PrintRegionConfig region_config_from_model_volume(const PrintRegionConfig &default_or_parent_region_config, const DynamicPrintConfig *layer_range_config, const ModelVolume &volume, size_t num_extruders);
-
-void print_region_ref_inc(PrintRegion &r) { ++ r.m_ref_cnt; }
-void print_region_ref_reset(PrintRegion &r) { r.m_ref_cnt = 0; }
-int  print_region_ref_cnt(const PrintRegion &r) { return r.m_ref_cnt; }
-
-// Verify whether the PrintRegions of a PrintObject are still valid, possibly after updating the region configs.
-// Before region configs are updated, callback_invalidate() is called to possibly stop background processing.
-// Returns false if this object needs to be resliced because regions were merged or split.
-bool verify_update_print_object_regions(
-    ModelVolumePtrs                     model_volumes,
-    const PrintRegionConfig            &default_region_config,
-    size_t                              num_extruders,
-    const std::vector<unsigned int>    &painting_extruders,
-    PrintObjectRegions                 &print_object_regions,
-    const std::function<void(const PrintRegionConfig&, const PrintRegionConfig&, const t_config_option_keys&)> &callback_invalidate)
-{
-    // Sort by ModelVolume ID.
-    model_volumes_sort_by_id(model_volumes);
-
-    for (std::unique_ptr<PrintRegion> &region : print_object_regions.all_regions)
-        print_region_ref_reset(*region);
-
-    // Verify and / or update PrintRegions produced by ModelVolumes, layer range modifiers, modifier volumes.
-    for (PrintObjectRegions::LayerRangeRegions &layer_range : print_object_regions.layer_ranges) {
-        // Each modifier ModelVolume intersecting this layer_range shall be referenced here at least once if it intersects some
-        // printable ModelVolume at this layer_range even if it does not modify its overlapping printable ModelVolume configuration yet.
-        // VolumeRegions reference ModelVolumes in layer_range.volume_regions the order they are stored in ModelObject volumes.
-        // Remember whether a given modifier ModelVolume was visited already.
-        auto it_model_volume_modifier_last = model_volumes.end();
-        for (PrintObjectRegions::VolumeRegion &region : layer_range.volume_regions)
-            if (region.model_volume->is_model_part() || region.model_volume->is_modifier()) {
-                auto it_model_volume = lower_bound_by_predicate(model_volumes.begin(), model_volumes.end(), [&region](const ModelVolume *l){ return l->id() < region.model_volume->id(); });
-                assert(it_model_volume != model_volumes.end() && (*it_model_volume)->id() == region.model_volume->id());
-                if (region.model_volume->is_modifier() && it_model_volume != it_model_volume_modifier_last) {
-                    // A modifier ModelVolume is visited for the first time.
-                    // A visited modifier may not have had parent volume_regions created overlapping with some model parts or modifiers,
-                    // if the visited modifier did not modify their properties. Now the visited modifier's configuration may have changed,
-                    // which may require new regions to be created.
-                    it_model_volume_modifier_last = it_model_volume;
-                    int next_region_id = int(&region - layer_range.volume_regions.data());
-                    const PrintObjectRegions::BoundingBox *bbox = find_volume_extents(layer_range, *region.model_volume);
-                    assert(bbox);
-                    for (int parent_region_id = next_region_id - 1; parent_region_id >= 0; -- parent_region_id) {
-                        const PrintObjectRegions::VolumeRegion &parent_region = layer_range.volume_regions[parent_region_id];
-                        assert(parent_region.model_volume != region.model_volume);
-                        if (parent_region.model_volume->is_model_part() || parent_region.model_volume->is_modifier()) {
-                            // volume_regions are produced in decreasing order of parent volume_regions ids.
-                            // Some regions may not have been generated the last time by generate_print_object_regions().
-                            assert(next_region_id == int(layer_range.volume_regions.size()) ||
-                                   layer_range.volume_regions[next_region_id].model_volume != region.model_volume ||
-                                   layer_range.volume_regions[next_region_id].parent <= parent_region_id);
-                            if (next_region_id < int(layer_range.volume_regions.size()) && 
-                                layer_range.volume_regions[next_region_id].model_volume == region.model_volume &&
-                                layer_range.volume_regions[next_region_id].parent == parent_region_id) {
-                                // A parent region is already overridden.
-                                ++ next_region_id;
-                            } else if (PrintObjectRegions::BoundingBox parent_bbox = find_modifier_volume_extents(layer_range, parent_region_id); parent_bbox.intersects(*bbox))
-                                // Such parent region does not exist. If it is needed, then we need to reslice.
-                                // Only create new region for a modifier, which actually modifies config of it's parent.
-                                if (PrintRegionConfig config = region_config_from_model_volume(parent_region.region->config(), nullptr, **it_model_volume, num_extruders);
-                                    config != parent_region.region->config())
-                                    // This modifier newly overrides a region, which it did not before. We need to reslice.
-                                    return false;
-                        }
-                    }
-                }
-                PrintRegionConfig cfg = region.parent == -1 ?
-                    region_config_from_model_volume(default_region_config, layer_range.config, **it_model_volume, num_extruders) :
-                    region_config_from_model_volume(layer_range.volume_regions[region.parent].region->config(), nullptr, **it_model_volume, num_extruders);
-                if (cfg != region.region->config()) {
-                    // Region configuration changed.
-                    if (print_region_ref_cnt(*region.region) == 0) {
-                        // Region is referenced for the first time. Just change its parameters.
-                        // Stop the background process before assigning new configuration to the regions.
-                        t_config_option_keys diff = region.region->config().diff(cfg);
-                        callback_invalidate(region.region->config(), cfg, diff);
-                        region.region->config_apply_only(cfg, diff, false);
-                    } else {
-                        // Region is referenced multiple times, thus the region is being split. We need to reslice.
-                        return false;
-                    }
-                }
-                print_region_ref_inc(*region.region);
-            }
-    }
-
-    // Verify and / or update PrintRegions produced by color painting. 
-    for (const PrintObjectRegions::LayerRangeRegions &layer_range : print_object_regions.layer_ranges)
-        for (const PrintObjectRegions::PaintedRegion &region : layer_range.painted_regions) {
-            const PrintObjectRegions::VolumeRegion &parent_region   = layer_range.volume_regions[region.parent];
-            PrintRegionConfig                       cfg             = parent_region.region->config();
-            cfg.perimeter_extruder.value    = region.extruder_id;
-            cfg.solid_infill_extruder.value = region.extruder_id;
-            cfg.infill_extruder.value       = region.extruder_id;
-            if (cfg != region.region->config()) {
-                // Region configuration changed.
-                if (print_region_ref_cnt(*region.region) == 0) {
-                    // Region is referenced for the first time. Just change its parameters.
-                    // Stop the background process before assigning new configuration to the regions.
-                    t_config_option_keys diff = region.region->config().diff(cfg);
-                    callback_invalidate(region.region->config(), cfg, diff);
-                    region.region->config_apply_only(cfg, diff, false);
-                } else {
-                    // Region is referenced multiple times, thus the region is being split. We need to reslice.
-                    return false;
-                }
-            }
-            print_region_ref_inc(*region.region);
-        }
-
-    // Lastly verify, whether some regions were not merged.
-    {
-        std::vector<const PrintRegion*> regions;
-        regions.reserve(print_object_regions.all_regions.size());
-        for (std::unique_ptr<PrintRegion> &region : print_object_regions.all_regions) {
-            assert(print_region_ref_cnt(*region) > 0);
-            regions.emplace_back(&(*region.get()));
-        }
-        std::sort(regions.begin(), regions.end(), [](const PrintRegion *l, const PrintRegion *r){ return l->config_hash() < r->config_hash(); });
-        for (size_t i = 0; i < regions.size(); ++ i) {
-            size_t hash = regions[i]->config_hash();
-            size_t j = i;
-            for (++ j; j < regions.size() && regions[j]->config_hash() == hash; ++ j)
-                if (regions[i]->config() == regions[j]->config()) {
-                    // Regions were merged. We need to reslice.
-                    return false;
-                }
-        }
-    }
-
-    return true;
-}
-
-// Update caches of volume bounding boxes.
-void update_volume_bboxes(
-    std::vector<PrintObjectRegions::LayerRangeRegions>  &layer_ranges,
-    std::vector<ObjectID>                               &cached_volume_ids,
-    ModelVolumePtrs                                      model_volumes,
-    const Transform3d                                   &object_trafo, 
-    const float                                          offset)
-{
-    // output will be sorted by the order of model_volumes sorted by their ObjectIDs.
-    model_volumes_sort_by_id(model_volumes);
-
-    if (layer_ranges.size() == 1) {
-        PrintObjectRegions::LayerRangeRegions &layer_range = layer_ranges.front();
-        std::vector<PrintObjectRegions::VolumeExtents> volumes_old(std::move(layer_range.volumes));
-        layer_range.volumes.reserve(model_volumes.size());
-        for (const ModelVolume *model_volume : model_volumes)
-            if (model_volume_solid_or_modifier(*model_volume)) {
-                if (std::binary_search(cached_volume_ids.begin(), cached_volume_ids.end(), model_volume->id())) {
-                    auto it = lower_bound_by_predicate(volumes_old.begin(), volumes_old.end(), [model_volume](PrintObjectRegions::VolumeExtents &l) { return l.volume_id < model_volume->id(); });
-                    if (it != volumes_old.end() && it->volume_id == model_volume->id())
-                        layer_range.volumes.emplace_back(*it);
-                } else
-                    layer_range.volumes.push_back({ model_volume->id(),
-                        transformed_its_bbox2d(model_volume->mesh().its, trafo_for_bbox(object_trafo, model_volume->get_matrix(false)), offset) });
-            }
-    } else {
-        std::vector<std::vector<PrintObjectRegions::VolumeExtents>> volumes_old;
-        if (cached_volume_ids.empty())
-            for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges)
-                layer_range.volumes.clear();
-        else {
-            volumes_old.reserve(layer_ranges.size());
-            for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges)
-                volumes_old.emplace_back(std::move(layer_range.volumes));
-        }
-
-        std::vector<std::pair<PrintObjectRegions::BoundingBox, bool>> bboxes;
-        std::vector<t_layer_height_range>                             ranges;
-        ranges.reserve(layer_ranges.size());
-        for (const PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges) {
-            t_layer_height_range r = layer_range.layer_height_range;
-            r.first  -= EPSILON;
-            r.second += EPSILON;
-            ranges.emplace_back(r);
-        }
-        for (const ModelVolume *model_volume : model_volumes)
-            if (model_volume_solid_or_modifier(*model_volume)) {
-                if (std::binary_search(cached_volume_ids.begin(), cached_volume_ids.end(), model_volume->id())) {
-                    for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges) {
-                        const auto &vold = volumes_old[&layer_range - layer_ranges.data()];
-                        auto it = lower_bound_by_predicate(vold.begin(), vold.end(), [model_volume](const PrintObjectRegions::VolumeExtents &l) { return l.volume_id < model_volume->id(); });
-                        if (it != vold.end() && it->volume_id == model_volume->id())
-                            layer_range.volumes.emplace_back(*it);
-                    }
-                } else {
-                    transformed_its_bboxes_in_z_ranges(model_volume->mesh().its, trafo_for_bbox(object_trafo, model_volume->get_matrix(false)), ranges, bboxes, offset);
-                    for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges)
-                        if (auto &bbox = bboxes[&layer_range - layer_ranges.data()]; bbox.second)
-                            layer_range.volumes.push_back({ model_volume->id(), bbox.first });
-                }
-            }
-    }
-
-    cached_volume_ids.clear();
-    cached_volume_ids.reserve(model_volumes.size());
-    for (const ModelVolume *v : model_volumes)
-        if (model_volume_solid_or_modifier(*v))
-            cached_volume_ids.emplace_back(v->id());
-}
-
-// Either a fresh PrintObject, or PrintObject regions were invalidated (merged, split).
-// Generate PrintRegions from scratch.
-static PrintObjectRegions* generate_print_object_regions(
-    PrintObjectRegions                          *print_object_regions_old,
-    const ModelVolumePtrs                       &model_volumes,
-    const LayerRanges                           &model_layer_ranges,
-    const PrintRegionConfig                     &default_region_config,
-    const Transform3d                           &trafo,
-    size_t                                       num_extruders,
-    const float                                  xy_size_compensation,
-    const std::vector<unsigned int>             &painting_extruders)
-{
-    // Reuse the old object or generate a new one.
-    auto out = print_object_regions_old ? std::unique_ptr<PrintObjectRegions>(print_object_regions_old) : std::make_unique<PrintObjectRegions>();
-    auto &all_regions          = out->all_regions;
-    auto &layer_ranges_regions = out->layer_ranges;
-
-    all_regions.clear();
-
-    bool reuse_old = print_object_regions_old && !print_object_regions_old->layer_ranges.empty();
-
-    if (reuse_old) {
-        // Reuse old bounding boxes of some ModelVolumes and their ranges.
-        // Verify that the old ranges match the new ranges.
-        assert(model_layer_ranges.size() == layer_ranges_regions.size());
-        for (const auto &range : model_layer_ranges) {
-            PrintObjectRegions::LayerRangeRegions &r = layer_ranges_regions[&range - &*model_layer_ranges.begin()];
-            assert(range.layer_height_range == r.layer_height_range);
-            // If model::assign_copy() is called, layer_ranges_regions is copied thus the pointers to configs are lost.
-            r.config = range.config;
-            r.volume_regions.clear();
-            r.painted_regions.clear();
-        }
-    } else {
-        out->trafo_bboxes = trafo;
-        layer_ranges_regions.reserve(model_layer_ranges.size());
-        for (const auto &range : model_layer_ranges)
-            layer_ranges_regions.push_back({ range.layer_height_range, range.config });
-    }
-
-    const bool is_mm_painted = num_extruders > 1 && std::any_of(model_volumes.cbegin(), model_volumes.cend(), [](const ModelVolume *mv) { return mv->is_mm_painted(); });
-    update_volume_bboxes(layer_ranges_regions, out->cached_volume_ids, model_volumes, out->trafo_bboxes, is_mm_painted ? 0.f : std::max(0.f, xy_size_compensation));
-
-    std::vector<PrintRegion*> region_set;
-    auto get_create_region = [&region_set, &all_regions](PrintRegionConfig &&config) -> PrintRegion* {
-        size_t hash = config.hash();
-        auto it = Slic3r::lower_bound_by_predicate(region_set.begin(), region_set.end(), [&config, hash](const PrintRegion* l) {
-            return l->config_hash() < hash || (l->config_hash() == hash && l->config() < config); });
-        if (it != region_set.end() && (*it)->config_hash() == hash && (*it)->config() == config)
-            return *it;
-        // Insert into a sorted array, it has O(n) complexity, but the calling algorithm has an O(n^2*log(n)) complexity anyways.
-        all_regions.emplace_back(std::make_unique<PrintRegion>(std::move(config), hash, int(all_regions.size())));
-        PrintRegion *region = all_regions.back().get();
-        region_set.emplace(it, region);
-        return region;
-    };
-
-    // Chain the regions in the order they are stored in the volumes list.
-    for (int volume_id = 0; volume_id < int(model_volumes.size()); ++ volume_id) {
-        const ModelVolume &volume = *model_volumes[volume_id];
-        if (model_volume_solid_or_modifier(volume)) {
-            for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges_regions)
-                if (const PrintObjectRegions::BoundingBox *bbox = find_volume_extents(layer_range, volume); bbox) {
-                    if (volume.is_model_part()) {
-                        // Add a model volume, assign an existing region or generate a new one.
-                        layer_range.volume_regions.push_back({
-                            &volume, -1,
-                            get_create_region(region_config_from_model_volume(default_region_config, layer_range.config, volume, num_extruders)),
-                            bbox
-                        });
-                    } else if (volume.is_negative_volume()) {
-                        // Add a negative (subtractor) volume. Such volume has neither region nor parent volume assigned.
-                        layer_range.volume_regions.push_back({ &volume, -1, nullptr, bbox });
-                    } else {
-                        assert(volume.is_modifier());
-                        // Modifiers may be chained one over the other. Check for overlap, merge DynamicPrintConfigs.
-                        bool added = false;
-                        int  parent_model_part_id = -1;
-                        for (int parent_region_id = int(layer_range.volume_regions.size()) - 1; parent_region_id >= 0; -- parent_region_id) {
-                            const PrintObjectRegions::VolumeRegion &parent_region = layer_range.volume_regions[parent_region_id];
-                            const ModelVolume                      &parent_volume = *parent_region.model_volume;
-                            if (parent_volume.is_model_part() || parent_volume.is_modifier())
-                                if (PrintObjectRegions::BoundingBox parent_bbox = find_modifier_volume_extents(layer_range, parent_region_id); parent_bbox.intersects(*bbox)) {
-                                    // Only create new region for a modifier, which actually modifies config of it's parent.
-                                    if (PrintRegionConfig config = region_config_from_model_volume(parent_region.region->config(), nullptr, volume, num_extruders); 
-                                        config != parent_region.region->config()) {
-                                        added = true;
-                                        layer_range.volume_regions.push_back({ &volume, parent_region_id, get_create_region(std::move(config)), bbox });
-                                    } else if (parent_model_part_id == -1 && parent_volume.is_model_part())
-                                        parent_model_part_id = parent_region_id;
-                                }
-                        }
-                        if (! added && parent_model_part_id >= 0)
-                            // This modifier does not override any printable volume's configuration, however it may in the future.
-                            // Store it so that verify_update_print_object_regions() will handle this modifier correctly if its configuration changes.
-                            layer_range.volume_regions.push_back({ &volume, parent_model_part_id, layer_range.volume_regions[parent_model_part_id].region, bbox });
-                    }
-                }
-            }
-    }
-
-    // Finally add painting regions.
-    for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges_regions) {
-        for (unsigned int painted_extruder_id : painting_extruders)
-            for (int parent_region_id = 0; parent_region_id < int(layer_range.volume_regions.size()); ++ parent_region_id)
-                if (const PrintObjectRegions::VolumeRegion &parent_region = layer_range.volume_regions[parent_region_id];
-                    parent_region.model_volume->is_model_part() || parent_region.model_volume->is_modifier()) {
-                    PrintRegionConfig cfg = parent_region.region->config();
-                    cfg.perimeter_extruder.value    = painted_extruder_id;
-                    cfg.solid_infill_extruder.value = painted_extruder_id;
-                    cfg.infill_extruder.value       = painted_extruder_id;
-                    layer_range.painted_regions.push_back({ painted_extruder_id, parent_region_id, get_create_region(std::move(cfg))});
-                }
-        // Sort the regions by parent region::print_object_region_id() and extruder_id to help the slicing algorithm when applying MMU segmentation.
-        std::sort(layer_range.painted_regions.begin(), layer_range.painted_regions.end(), [&layer_range](auto &l, auto &r) {
-            int lid = layer_range.volume_regions[l.parent].region->print_object_region_id();
-            int rid = layer_range.volume_regions[r.parent].region->print_object_region_id();
-            return lid < rid || (lid == rid && l.extruder_id < r.extruder_id); });
-    }
-
-    return out.release();
-}
-
-Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_config)
-{
-#ifdef _DEBUG
-    check_model_ids_validity(model);
-#endif /* _DEBUG */
-
-    // Normalize the config.
-	new_full_config.option("print_settings_id",            true);
-	new_full_config.option("filament_settings_id",         true);
-	new_full_config.option("printer_settings_id",          true);
-    new_full_config.option("physical_printer_settings_id", true);
-    new_full_config.normalize_fdm();
-
-    // Find modified keys of the various configs. Resolve overrides extruder retract values by filament profiles.
-    DynamicPrintConfig   filament_overrides;
-    t_config_option_keys print_diff       = print_config_diffs(m_config, new_full_config, filament_overrides);
-    t_config_option_keys full_config_diff = full_print_config_diffs(m_full_print_config, new_full_config);
-    // Collect changes to object and region configs.
-    t_config_option_keys object_diff      = m_default_object_config.diff(new_full_config);
-    t_config_option_keys region_diff      = m_default_region_config.diff(new_full_config);
-
-    // Do not use the ApplyStatus as we will use the max function when updating apply_status.
-    unsigned int apply_status = APPLY_STATUS_UNCHANGED;
-    auto update_apply_status = [&apply_status](bool invalidated)
-        { apply_status = std::max<unsigned int>(apply_status, invalidated ? APPLY_STATUS_INVALIDATED : APPLY_STATUS_CHANGED); };
-    if (! (print_diff.empty() && object_diff.empty() && region_diff.empty()))
-        update_apply_status(false);
-
-    // Grab the lock for the Print / PrintObject milestones.
-	std::scoped_lock<std::mutex> lock(this->state_mutex());
-
-    // The following call may stop the background processing.
-    if (! print_diff.empty())
-        update_apply_status(this->invalidate_state_by_config_options(new_full_config, print_diff));
-
-    // Apply variables to placeholder parser. The placeholder parser is used by G-code export,
-    // which should be stopped if print_diff is not empty.
-    size_t num_extruders = m_config.nozzle_diameter.size();
-    bool   num_extruders_changed = false;
-    if (! full_config_diff.empty()) {
-        update_apply_status(this->invalidate_step(psGCodeExport));
-        m_placeholder_parser.clear_config();
-        // Set the profile aliases for the PrintBase::output_filename()
-		m_placeholder_parser.set("print_preset",              new_full_config.option("print_settings_id")->clone());
-		m_placeholder_parser.set("filament_preset",           new_full_config.option("filament_settings_id")->clone());
-		m_placeholder_parser.set("printer_preset",            new_full_config.option("printer_settings_id")->clone());
-        m_placeholder_parser.set("physical_printer_preset",   new_full_config.option("physical_printer_settings_id")->clone());
-		// We want the filament overrides to be applied over their respective extruder parameters by the PlaceholderParser.
-		// see "Placeholders do not respect filament overrides." GH issue #3649
-		m_placeholder_parser.apply_config(filament_overrides);
-	    // It is also safe to change m_config now after this->invalidate_state_by_config_options() call.
-	    m_config.apply_only(new_full_config, print_diff, true);
-	    //FIXME use move semantics once ConfigBase supports it.
-        // Some filament_overrides may contain values different from new_full_config, but equal to m_config.
-        // As long as these config options don't reallocate memory when copying, we are safe overriding a value, which is in use by a worker thread.
-	    m_config.apply(filament_overrides);
-	    // Handle changes to object config defaults
-	    m_default_object_config.apply_only(new_full_config, object_diff, true);
-	    // Handle changes to regions config defaults
-	    m_default_region_config.apply_only(new_full_config, region_diff, true);
-        m_full_print_config = std::move(new_full_config);
-        if (num_extruders != m_config.nozzle_diameter.size()) {
-            num_extruders = m_config.nozzle_diameter.size();
-            num_extruders_changed = true;
-        }
-    }
-    
-    ModelObjectStatusDB model_object_status_db;
-
-    // 1) Synchronize model objects.
-    bool print_regions_reshuffled = false;
-    if (model.id() != m_model.id()) {
-        // Kill everything, initialize from scratch.
-        // Stop background processing.
-        this->call_cancel_callback();
-        update_apply_status(this->invalidate_all_steps());
-        for (PrintObject *object : m_objects) {
-            model_object_status_db.add(*object->model_object(), ModelObjectStatus::Deleted);
-			update_apply_status(object->invalidate_all_steps());
-			delete object;
-        }
-        m_objects.clear();
-        print_regions_reshuffled = true;
-        m_model.assign_copy(model);
-		for (const ModelObject *model_object : m_model.objects)
-			model_object_status_db.add(*model_object, ModelObjectStatus::New);
-    } else {
-        if (m_model.custom_gcode_per_print_z != model.custom_gcode_per_print_z) {
-            update_apply_status(num_extruders_changed || 
-            	// Tool change G-codes are applied as color changes for a single extruder printer, no need to invalidate tool ordering.
-            	//FIXME The tool ordering may be invalidated unnecessarily if the custom_gcode_per_print_z.mode is not applicable
-            	// to the active print / model state, and then it is reset, so it is being applicable, but empty, thus the effect is the same.
-            	(num_extruders > 1 && custom_per_printz_gcodes_tool_changes_differ(m_model.custom_gcode_per_print_z.gcodes, model.custom_gcode_per_print_z.gcodes)) ?
-            	// The Tool Ordering and the Wipe Tower are no more valid.
-            	this->invalidate_steps({ psWipeTower, psGCodeExport }) :
-            	// There is no change in Tool Changes stored in custom_gcode_per_print_z, therefore there is no need to update Tool Ordering.
-            	this->invalidate_step(psGCodeExport));
-            m_model.custom_gcode_per_print_z = model.custom_gcode_per_print_z;
-        }
-        if (model_object_list_equal(m_model, model)) {
-            // The object list did not change.
-			for (const ModelObject *model_object : m_model.objects)
-				model_object_status_db.add(*model_object, ModelObjectStatus::Old);
-        } else if (model_object_list_extended(m_model, model)) {
-            // Add new objects. Their volumes and configs will be synchronized later.
-            update_apply_status(this->invalidate_step(psGCodeExport));
-            for (const ModelObject *model_object : m_model.objects)
-                model_object_status_db.add(*model_object, ModelObjectStatus::Old);
-            for (size_t i = m_model.objects.size(); i < model.objects.size(); ++ i) {
-                model_object_status_db.add(*model.objects[i], ModelObjectStatus::New);
-                m_model.objects.emplace_back(ModelObject::new_copy(*model.objects[i]));
-				m_model.objects.back()->set_model(&m_model);
-            }
-        } else {
-            // Reorder the objects, add new objects.
-            // First stop background processing before shuffling or deleting the PrintObjects in the object list.
-            this->call_cancel_callback();
-            update_apply_status(this->invalidate_step(psGCodeExport));
-            // Second create a new list of objects.
-            std::vector<ModelObject*> model_objects_old(std::move(m_model.objects));
-            m_model.objects.clear();
-            m_model.objects.reserve(model.objects.size());
-            auto by_id_lower = [](const ModelObject *lhs, const ModelObject *rhs){ return lhs->id() < rhs->id(); };
-            std::sort(model_objects_old.begin(), model_objects_old.end(), by_id_lower);
-            for (const ModelObject *mobj : model.objects) {
-                auto it = std::lower_bound(model_objects_old.begin(), model_objects_old.end(), mobj, by_id_lower);
-                if (it == model_objects_old.end() || (*it)->id() != mobj->id()) {
-                    // New ModelObject added.
-					m_model.objects.emplace_back(ModelObject::new_copy(*mobj));
-					m_model.objects.back()->set_model(&m_model);
-                    model_object_status_db.add(*mobj, ModelObjectStatus::New);
-                } else {
-                    // Existing ModelObject re-added (possibly moved in the list).
-                    m_model.objects.emplace_back(*it);
-                    model_object_status_db.add(*mobj, ModelObjectStatus::Moved);
-                }
-            }
-            bool deleted_any = false;
-			for (ModelObject *&model_object : model_objects_old)
-                if (model_object_status_db.add_if_new(*model_object, ModelObjectStatus::Deleted))
-                    deleted_any = true;
-                else
-                    // Do not delete this ModelObject instance.
-                    model_object = nullptr;
-            if (deleted_any) {
-                // Delete PrintObjects of the deleted ModelObjects.
-                PrintObjectPtrs print_objects_old = std::move(m_objects);
-                m_objects.clear();
-                m_objects.reserve(print_objects_old.size());
-                for (PrintObject *print_object : print_objects_old) {
-                    const ModelObjectStatus &status = model_object_status_db.get(*print_object->model_object());
-                    if (status.status == ModelObjectStatus::Deleted) {
-                        update_apply_status(print_object->invalidate_all_steps());
-                        delete print_object;
-                    } else
-                        m_objects.emplace_back(print_object);
-                }
-                for (ModelObject *model_object : model_objects_old)
-                    delete model_object;
-                print_regions_reshuffled = true;
-            }
-        }
-    }
-
-    // 2) Map print objects including their transformation matrices.
-    PrintObjectStatusDB print_object_status_db(m_objects);
-
-    // 3) Synchronize ModelObjects & PrintObjects.
-    const std::initializer_list<ModelVolumeType> solid_or_modifier_types { ModelVolumeType::MODEL_PART, ModelVolumeType::NEGATIVE_VOLUME, ModelVolumeType::PARAMETER_MODIFIER };
-    for (size_t idx_model_object = 0; idx_model_object < model.objects.size(); ++ idx_model_object) {
-        ModelObject       &model_object        = *m_model.objects[idx_model_object];
-        ModelObjectStatus &model_object_status = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(model_object));
-		const ModelObject &model_object_new    = *model.objects[idx_model_object];
-        if (model_object_status.status == ModelObjectStatus::New)
-            // PrintObject instances will be added in the next loop.
-            continue;
-        // Update the ModelObject instance, possibly invalidate the linked PrintObjects.
-        assert(model_object_status.status == ModelObjectStatus::Old || model_object_status.status == ModelObjectStatus::Moved);
-        // Check whether a model part volume was added or removed, their transformations or order changed.
-        // Only volume IDs, volume types, transformation matrices and their order are checked, configuration and other parameters are NOT checked.
-        bool solid_or_modifier_differ   = model_volume_list_changed(model_object, model_object_new, solid_or_modifier_types) ||
-                                          model_mmu_segmentation_data_changed(model_object, model_object_new) ||
-                                          (model_object_new.is_mm_painted() && num_extruders_changed);
-        bool supports_differ            = model_volume_list_changed(model_object, model_object_new, ModelVolumeType::SUPPORT_BLOCKER) ||
-                                          model_volume_list_changed(model_object, model_object_new, ModelVolumeType::SUPPORT_ENFORCER);
-        bool layer_height_ranges_differ = ! layer_height_ranges_equal(model_object.layer_config_ranges, model_object_new.layer_config_ranges, model_object_new.layer_height_profile.empty());
-        bool model_origin_translation_differ = model_object.origin_translation != model_object_new.origin_translation;
-        auto print_objects_range        = print_object_status_db.get_range(model_object);
-        // The list actually can be empty if all instances are out of the print bed.
-        //assert(print_objects_range.begin() != print_objects_range.end());
-        // All PrintObjects in print_objects_range shall point to the same prints_objects_regions
-        if (print_objects_range.begin() != print_objects_range.end()) {
-            model_object_status.print_object_regions = print_objects_range.begin()->print_object->m_shared_regions;
-            model_object_status.print_object_regions->ref_cnt_inc();
-        }
-        if (solid_or_modifier_differ || model_origin_translation_differ || layer_height_ranges_differ ||
-            ! model_object.layer_height_profile.timestamp_matches(model_object_new.layer_height_profile)) {
-            // The very first step (the slicing step) is invalidated. One may freely remove all associated PrintObjects.
-            model_object_status.print_object_regions_status = 
-                model_object_status.print_object_regions == nullptr || model_origin_translation_differ || layer_height_ranges_differ ?
-                // Drop print_objects_regions.
-                ModelObjectStatus::PrintObjectRegionsStatus::Invalid :
-                // Reuse bounding boxes of print_objects_regions for ModelVolumes with unmodified transformation.
-                ModelObjectStatus::PrintObjectRegionsStatus::PartiallyValid;
-            for (const PrintObjectStatus &print_object_status : print_objects_range) {
-                update_apply_status(print_object_status.print_object->invalidate_all_steps());
-                const_cast<PrintObjectStatus&>(print_object_status).status = PrintObjectStatus::Deleted;
-            }
-            if (model_object_status.print_object_regions_status == ModelObjectStatus::PrintObjectRegionsStatus::PartiallyValid)
-                // Drop everything from PrintObjectRegions but those VolumeExtents (of their particular ModelVolumes) that are still valid.
-                print_objects_regions_invalidate_keep_some_volumes(*model_object_status.print_object_regions, model_object.volumes, model_object_new.volumes);
-            else if (model_object_status.print_object_regions != nullptr)
-                model_object_status.print_object_regions->clear();
-            // Copy content of the ModelObject including its ID, do not change the parent.
-            model_object.assign_copy(model_object_new);
-        } else {
-            model_object_status.print_object_regions_status = ModelObjectStatus::PrintObjectRegionsStatus::Valid;
-            if (supports_differ || model_custom_supports_data_changed(model_object, model_object_new)) {
-                // First stop background processing before shuffling or deleting the ModelVolumes in the ModelObject's list.
-                if (supports_differ) {
-                    this->call_cancel_callback();
-                    update_apply_status(false);
-                }
-                // Invalidate just the supports step.
-                for (const PrintObjectStatus &print_object_status : print_objects_range)
-                    update_apply_status(print_object_status.print_object->invalidate_step(posSupportMaterial));
-                if (supports_differ) {
-                    // Copy just the support volumes.
-                    model_volume_list_update_supports(model_object, model_object_new);
-                }
-            } else if (model_custom_seam_data_changed(model_object, model_object_new)) {
-                update_apply_status(this->invalidate_step(psGCodeExport));
-            }
-        }
-        if (! solid_or_modifier_differ) {
-            // Synchronize Object's config.
-            bool object_config_changed = ! model_object.config.timestamp_matches(model_object_new.config);
-			if (object_config_changed)
-				model_object.config.assign_config(model_object_new.config);
-            if (! object_diff.empty() || object_config_changed || num_extruders_changed) {
-                PrintObjectConfig new_config = PrintObject::object_config_from_model_object(m_default_object_config, model_object, num_extruders);
-                for (const PrintObjectStatus &print_object_status : print_object_status_db.get_range(model_object)) {
-                    t_config_option_keys diff = print_object_status.print_object->config().diff(new_config);
-                    if (! diff.empty()) {
-                        update_apply_status(print_object_status.print_object->invalidate_state_by_config_options(print_object_status.print_object->config(), new_config, diff));
-                        print_object_status.print_object->config_apply_only(new_config, diff, true);
-                    }
-                }
-            }
-            // Synchronize (just copy) the remaining data of ModelVolumes (name, config, custom supports data).
-            //FIXME What to do with m_material_id?
-			model_volume_list_copy_configs(model_object /* dst */, model_object_new /* src */, ModelVolumeType::MODEL_PART);
-			model_volume_list_copy_configs(model_object /* dst */, model_object_new /* src */, ModelVolumeType::PARAMETER_MODIFIER);
-            layer_height_ranges_copy_configs(model_object.layer_config_ranges /* dst */, model_object_new.layer_config_ranges /* src */);
-            // Copy the ModelObject name, input_file and instances. The instances will be compared against PrintObject instances in the next step.
-            model_object.name       = model_object_new.name;
-            model_object.input_file = model_object_new.input_file;
-            // Only refresh ModelInstances if there is any change.
-            if (model_object.instances.size() != model_object_new.instances.size() || 
-            	! std::equal(model_object.instances.begin(), model_object.instances.end(), model_object_new.instances.begin(), [](auto l, auto r){ return l->id() == r->id(); })) {
-            	// G-code generator accesses model_object.instances to generate sequential print ordering matching the Plater object list.
-            	update_apply_status(this->invalidate_step(psGCodeExport));
-	            model_object.clear_instances();
-	            model_object.instances.reserve(model_object_new.instances.size());
-	            for (const ModelInstance *model_instance : model_object_new.instances) {
-	                model_object.instances.emplace_back(new ModelInstance(*model_instance));
-	                model_object.instances.back()->set_model_object(&model_object);
-	            }
-	        } else if (! std::equal(model_object.instances.begin(), model_object.instances.end(), model_object_new.instances.begin(), 
-	        		[](auto l, auto r){ return l->print_volume_state == r->print_volume_state && l->printable == r->printable && 
-	        						           l->get_transformation().get_matrix().isApprox(r->get_transformation().get_matrix()); })) {
-	        	// If some of the instances changed, the bounding box of the updated ModelObject is likely no more valid.
-	        	// This is safe as the ModelObject's bounding box is only accessed from this function, which is called from the main thread only.
-	 			model_object.invalidate_bounding_box();
-	        	// Synchronize the content of instances.
-	        	auto new_instance = model_object_new.instances.begin();
-				for (auto old_instance = model_object.instances.begin(); old_instance != model_object.instances.end(); ++ old_instance, ++ new_instance) {
-					(*old_instance)->set_transformation((*new_instance)->get_transformation());
-                    (*old_instance)->print_volume_state = (*new_instance)->print_volume_state;
-                    (*old_instance)->printable 		    = (*new_instance)->printable;
-  				}
-	        }
-        }
-    }
-
-    // 4) Generate PrintObjects from ModelObjects and their instances.
-    {
-        PrintObjectPtrs print_objects_new;
-        print_objects_new.reserve(std::max(m_objects.size(), m_model.objects.size()));
-        bool new_objects = false;
-        // Walk over all new model objects and check, whether there are matching PrintObjects.
-        for (ModelObject *model_object : m_model.objects) {
-            ModelObjectStatus &model_object_status = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(*model_object));
-            model_object_status.print_instances    = print_objects_from_model_object(*model_object);
-            std::vector<const PrintObjectStatus*> old;
-            old.reserve(print_object_status_db.count(*model_object));
-            for (const PrintObjectStatus &print_object_status : print_object_status_db.get_range(*model_object))
-                if (print_object_status.status != PrintObjectStatus::Deleted)
-                    old.emplace_back(&print_object_status);
-            // Generate a list of trafos and XY offsets for instances of a ModelObject
-            // Producing the config for PrintObject on demand, caching it at print_object_last.
-            const PrintObject *print_object_last = nullptr;
-            auto print_object_apply_config = [this, &print_object_last, model_object, num_extruders](PrintObject *print_object) {
-                print_object->config_apply(print_object_last ?
-                    print_object_last->config() :
-                    PrintObject::object_config_from_model_object(m_default_object_config, *model_object, num_extruders));
-                print_object_last = print_object;
-            };
-            if (old.empty()) {
-                // Simple case, just generate new instances.
-                for (PrintObjectTrafoAndInstances &print_instances : model_object_status.print_instances) {
-                    PrintObject *print_object = new PrintObject(this, model_object, print_instances.trafo, std::move(print_instances.instances));
-                    print_object_apply_config(print_object);
-                    print_objects_new.emplace_back(print_object);
-                    // print_object_status.emplace(PrintObjectStatus(print_object, PrintObjectStatus::New));
-                    new_objects = true;
-                }
-                continue;
-            }
-            // Complex case, try to merge the two lists.
-            // Sort the old lexicographically by their trafos.
-            std::sort(old.begin(), old.end(), [](const PrintObjectStatus *lhs, const PrintObjectStatus *rhs){ return transform3d_lower(lhs->trafo, rhs->trafo); });
-            // Merge the old / new lists.
-            auto it_old = old.begin();
-            for (PrintObjectTrafoAndInstances &new_instances : model_object_status.print_instances) {
-				for (; it_old != old.end() && transform3d_lower((*it_old)->trafo, new_instances.trafo); ++ it_old);
-				if (it_old == old.end() || ! transform3d_equal((*it_old)->trafo, new_instances.trafo)) {
-                    // This is a new instance (or a set of instances with the same trafo). Just add it.
-                    PrintObject *print_object = new PrintObject(this, model_object, new_instances.trafo, std::move(new_instances.instances));
-                    print_object_apply_config(print_object);
-                    print_objects_new.emplace_back(print_object);
-                    // print_object_status.emplace(PrintObjectStatus(print_object, PrintObjectStatus::New));
-                    new_objects = true;
-                    if (it_old != old.end())
-                        const_cast<PrintObjectStatus*>(*it_old)->status = PrintObjectStatus::Deleted;
-                } else {
-                    // The PrintObject already exists and the copies differ.
-					PrintBase::ApplyStatus status = (*it_old)->print_object->set_instances(std::move(new_instances.instances));
-                    if (status != PrintBase::APPLY_STATUS_UNCHANGED)
-						update_apply_status(status == PrintBase::APPLY_STATUS_INVALIDATED);
-					print_objects_new.emplace_back((*it_old)->print_object);
-					const_cast<PrintObjectStatus*>(*it_old)->status = PrintObjectStatus::Reused;
-				}
-            }
-        }
-        if (m_objects != print_objects_new) {
-            this->call_cancel_callback();
-			update_apply_status(this->invalidate_all_steps());
-            m_objects = print_objects_new;
-            // Delete the PrintObjects marked as Unknown or Deleted.
-            bool deleted_objects = false;
-            for (const PrintObjectStatus &pos : print_object_status_db)
-                if (pos.status == PrintObjectStatus::Unknown || pos.status == PrintObjectStatus::Deleted) {
-                    update_apply_status(pos.print_object->invalidate_all_steps());
-                    delete pos.print_object;
-					deleted_objects = true;
-                }
-			if (new_objects || deleted_objects)
-                update_apply_status(this->invalidate_steps({ psSkirtBrim, psWipeTower, psGCodeExport }));
-			if (new_objects)
-	            update_apply_status(false);
-            print_regions_reshuffled = true;
-        }
-        print_object_status_db.clear();
-    }
-
-    // All regions now have distinct settings.
-    // Check whether applying the new region config defaults we would get different regions,
-    // update regions or create regions from scratch.
-    for (auto it_print_object = m_objects.begin(); it_print_object != m_objects.end();) {
-        // Find the range of PrintObjects sharing the same associated ModelObject.
-        auto                it_print_object_end  = it_print_object;
-        PrintObject        &print_object         = *(*it_print_object);
-        const ModelObject  &model_object         = *print_object.model_object();
-        ModelObjectStatus  &model_object_status  = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(model_object));
-        PrintObjectRegions *print_object_regions = model_object_status.print_object_regions;
-        for (++ it_print_object_end; it_print_object_end != m_objects.end() && (*it_print_object)->model_object() == (*it_print_object_end)->model_object(); ++ it_print_object_end)
-            assert((*it_print_object_end)->m_shared_regions == nullptr || (*it_print_object_end)->m_shared_regions == print_object_regions);
-        if (print_object_regions == nullptr) {
-            print_object_regions = new PrintObjectRegions{};
-            model_object_status.print_object_regions = print_object_regions;
-            print_object_regions->ref_cnt_inc();
-        }
-        std::vector<unsigned int> painting_extruders;
-        if (const auto &volumes = print_object.model_object()->volumes;
-            num_extruders > 1 &&
-            std::find_if(volumes.begin(), volumes.end(), [](const ModelVolume *v) { return ! v->mmu_segmentation_facets.empty(); }) != volumes.end()) {
-            //FIXME be more specific! Don't enumerate extruders that are not used for painting!
-            painting_extruders.assign(num_extruders, 0);
-            std::iota(painting_extruders.begin(), painting_extruders.end(), 1);
-        }
-        if (model_object_status.print_object_regions_status == ModelObjectStatus::PrintObjectRegionsStatus::Valid) {
-            // Verify that the trafo for regions & volume bounding boxes thus for regions is still applicable.
-            auto invalidate = [it_print_object, it_print_object_end, update_apply_status]() {
-                for (auto it = it_print_object; it != it_print_object_end; ++ it)
-                    if ((*it)->m_shared_regions != nullptr)
-                        update_apply_status((*it)->invalidate_all_steps());
-            };
-            if (print_object_regions && ! trafos_differ_in_rotation_by_z_and_mirroring_by_xy_only(print_object_regions->trafo_bboxes, model_object_status.print_instances.front().trafo)) {
-                invalidate();
-                print_object_regions->clear();
-                model_object_status.print_object_regions_status = ModelObjectStatus::PrintObjectRegionsStatus::Invalid;
-                print_regions_reshuffled = true;
-            } else if (print_object_regions &&
-                verify_update_print_object_regions(
-                    print_object.model_object()->volumes,
-                    m_default_region_config,
-                    num_extruders,
-                    painting_extruders,
-                    *print_object_regions,
-                    [it_print_object, it_print_object_end, &update_apply_status](const PrintRegionConfig &old_config, const PrintRegionConfig &new_config, const t_config_option_keys &diff_keys) {
-                        for (auto it = it_print_object; it != it_print_object_end; ++it)
-                            if ((*it)->m_shared_regions != nullptr)
-                                update_apply_status((*it)->invalidate_state_by_config_options(old_config, new_config, diff_keys));
-                    })) {
-                // Regions are valid, just keep them.
-            } else {
-                // Regions were reshuffled.
-                invalidate();
-                // At least reuse layer ranges and bounding boxes of ModelVolumes.
-                model_object_status.print_object_regions_status = ModelObjectStatus::PrintObjectRegionsStatus::PartiallyValid;
-                print_regions_reshuffled = true;
-            }
-        }
-        if (print_object_regions == nullptr || model_object_status.print_object_regions_status != ModelObjectStatus::PrintObjectRegionsStatus::Valid) {
-            // Layer ranges with their associated configurations. Remove overlaps between the ranges
-            // and create the regions from scratch.
-            print_object_regions = generate_print_object_regions(
-                print_object_regions,
-                print_object.model_object()->volumes,
-                LayerRanges(print_object.model_object()->layer_config_ranges),
-                m_default_region_config,
-                model_object_status.print_instances.front().trafo,
-                num_extruders,
-                print_object.is_mm_painted() ? 0.f : float(print_object.config().xy_size_compensation.value),
-                painting_extruders);
-        }
-        for (auto it = it_print_object; it != it_print_object_end; ++it)
-            if ((*it)->m_shared_regions) {
-                assert((*it)->m_shared_regions == print_object_regions);
-            } else {
-                (*it)->m_shared_regions = print_object_regions;
-                print_object_regions->ref_cnt_inc();
-            }
-        it_print_object = it_print_object_end;
-    }
-
-    if (print_regions_reshuffled) {
-        // Update Print::m_print_regions from objects.
-        struct cmp { bool operator() (const PrintRegion *l, const PrintRegion *r) const { return l->config_hash() == r->config_hash() && l->config() == r->config(); } };
-        std::set<const PrintRegion*, cmp> region_set;
-        m_print_regions.clear();
-        PrintObjectRegions *print_object_regions = nullptr;
-        for (PrintObject *print_object : m_objects)
-            if (print_object_regions != print_object->m_shared_regions) {
-                print_object_regions = print_object->m_shared_regions;
-                for (std::unique_ptr<Slic3r::PrintRegion> &print_region : print_object_regions->all_regions)
-                    if (auto it = region_set.find(print_region.get()); it == region_set.end()) {
-                        int print_region_id = int(m_print_regions.size());
-                        m_print_regions.emplace_back(print_region.get());
-                        print_region->m_print_region_id = print_region_id;
-                    } else {
-                        print_region->m_print_region_id = (*it)->print_region_id();
-                    }
-            }
-    }
-
-    // Update SlicingParameters for each object where the SlicingParameters is not valid.
-    // If it is not valid, then it is ensured that PrintObject.m_slicing_params is not in use
-    // (posSlicing and posSupportMaterial was invalidated).
-    for (PrintObject *object : m_objects)
-        object->update_slicing_parameters();
-
-#ifdef _DEBUG
-    check_model_ids_equal(m_model, model);
-#endif /* _DEBUG */
-
-	return static_cast<ApplyStatus>(apply_status);
-}
-
-} // namespace Slic3r
+#include "Model.hpp"

+#include "Print.hpp"

+

+#include <cfloat>

+

+namespace Slic3r {

+

+// Add or remove support modifier ModelVolumes from model_object_dst to match the ModelVolumes of model_object_new

+// in the exact order and with the same IDs.

+// It is expected, that the model_object_dst already contains the non-support volumes of model_object_new in the correct order.

+// Friend to ModelVolume to allow copying.

+// static is not accepted by gcc if declared as a friend of ModelObject.

+/* static */ void model_volume_list_update_supports(ModelObject &model_object_dst, const ModelObject &model_object_new)

+{

+    typedef std::pair<const ModelVolume*, bool> ModelVolumeWithStatus;

+    std::vector<ModelVolumeWithStatus> old_volumes;

+    old_volumes.reserve(model_object_dst.volumes.size());

+    for (const ModelVolume *model_volume : model_object_dst.volumes)

+        old_volumes.emplace_back(ModelVolumeWithStatus(model_volume, false));

+    auto model_volume_lower = [](const ModelVolumeWithStatus &mv1, const ModelVolumeWithStatus &mv2){ return mv1.first->id() <  mv2.first->id(); };

+    auto model_volume_equal = [](const ModelVolumeWithStatus &mv1, const ModelVolumeWithStatus &mv2){ return mv1.first->id() == mv2.first->id(); };

+    std::sort(old_volumes.begin(), old_volumes.end(), model_volume_lower);

+    model_object_dst.volumes.clear();

+    model_object_dst.volumes.reserve(model_object_new.volumes.size());

+    for (const ModelVolume *model_volume_src : model_object_new.volumes) {

+        ModelVolumeWithStatus key(model_volume_src, false);

+        auto it = std::lower_bound(old_volumes.begin(), old_volumes.end(), key, model_volume_lower);

+        if (it != old_volumes.end() && model_volume_equal(*it, key)) {

+            // The volume was found in the old list. Just copy it.

+            assert(! it->second); // not consumed yet

+            it->second = true;

+            ModelVolume *model_volume_dst = const_cast<ModelVolume*>(it->first);

+            // For support modifiers, the type may have been switched from blocker to enforcer and vice versa.

+            assert((model_volume_dst->is_support_modifier() && model_volume_src->is_support_modifier()) || model_volume_dst->type() == model_volume_src->type());

+            model_object_dst.volumes.emplace_back(model_volume_dst);

+            if (model_volume_dst->is_support_modifier()) {

+                // For support modifiers, the type may have been switched from blocker to enforcer and vice versa.

+                model_volume_dst->set_type(model_volume_src->type());

+                model_volume_dst->set_transformation(model_volume_src->get_transformation());

+            }

+            assert(model_volume_dst->get_matrix().isApprox(model_volume_src->get_matrix()));

+        } else {

+            // The volume was not found in the old list. Create a new copy.

+            assert(model_volume_src->is_support_modifier());

+            model_object_dst.volumes.emplace_back(new ModelVolume(*model_volume_src));

+            model_object_dst.volumes.back()->set_model_object(&model_object_dst);

+        }

+    }

+    // Release the non-consumed old volumes (those were deleted from the new list).

+    for (ModelVolumeWithStatus &mv_with_status : old_volumes)

+        if (! mv_with_status.second)

+            delete mv_with_status.first;

+}

+

+static inline void model_volume_list_copy_configs(ModelObject &model_object_dst, const ModelObject &model_object_src, const ModelVolumeType type)

+{

+    size_t i_src, i_dst;

+    for (i_src = 0, i_dst = 0; i_src < model_object_src.volumes.size() && i_dst < model_object_dst.volumes.size();) {

+        const ModelVolume &mv_src = *model_object_src.volumes[i_src];

+        ModelVolume       &mv_dst = *model_object_dst.volumes[i_dst];

+        if (mv_src.type() != type) {

+            ++ i_src;

+            continue;

+        }

+        if (mv_dst.type() != type) {

+            ++ i_dst;

+            continue;

+        }

+        assert(mv_src.id() == mv_dst.id());

+        // Copy the ModelVolume data.

+        mv_dst.name   = mv_src.name;

+		mv_dst.config.assign_config(mv_src.config);

+        assert(mv_dst.supported_facets.id() == mv_src.supported_facets.id());

+        mv_dst.supported_facets.assign(mv_src.supported_facets);

+        assert(mv_dst.seam_facets.id() == mv_src.seam_facets.id());

+        mv_dst.seam_facets.assign(mv_src.seam_facets);

+        assert(mv_dst.mmu_segmentation_facets.id() == mv_src.mmu_segmentation_facets.id());

+        mv_dst.mmu_segmentation_facets.assign(mv_src.mmu_segmentation_facets);

+        //FIXME what to do with the materials?

+        // mv_dst.m_material_id = mv_src.m_material_id;

+        ++ i_src;

+        ++ i_dst;

+    }

+}

+

+static inline void layer_height_ranges_copy_configs(t_layer_config_ranges &lr_dst, const t_layer_config_ranges &lr_src)

+{

+    assert(lr_dst.size() == lr_src.size());

+    auto it_src = lr_src.cbegin();

+    for (auto &kvp_dst : lr_dst) {

+        const auto &kvp_src = *it_src ++;

+        assert(std::abs(kvp_dst.first.first  - kvp_src.first.first ) <= EPSILON);

+        assert(std::abs(kvp_dst.first.second - kvp_src.first.second) <= EPSILON);

+        // Layer heights are allowed do differ in case the layer height table is being overriden by the smooth profile.

+        // assert(std::abs(kvp_dst.second.option("layer_height")->getFloat() - kvp_src.second.option("layer_height")->getFloat()) <= EPSILON);

+        kvp_dst.second = kvp_src.second;

+    }

+}

+

+static inline bool transform3d_lower(const Transform3d &lhs, const Transform3d &rhs) 

+{

+    typedef Transform3d::Scalar T;

+    const T *lv = lhs.data();

+    const T *rv = rhs.data();

+    for (size_t i = 0; i < 16; ++ i, ++ lv, ++ rv) {

+        if (*lv < *rv)

+            return true;

+        else if (*lv > *rv)

+            return false;

+    }

+    return false;

+}

+

+static inline bool transform3d_equal(const Transform3d &lhs, const Transform3d &rhs) 

+{

+    typedef Transform3d::Scalar T;

+    const T *lv = lhs.data();

+    const T *rv = rhs.data();

+    for (size_t i = 0; i < 16; ++ i, ++ lv, ++ rv)

+        if (*lv != *rv)

+            return false;

+    return true;

+}

+

+struct PrintObjectTrafoAndInstances

+{

+    Transform3d    	trafo;

+    PrintInstances	instances;

+    bool operator<(const PrintObjectTrafoAndInstances &rhs) const { return transform3d_lower(this->trafo, rhs.trafo); }

+};

+

+// Generate a list of trafos and XY offsets for instances of a ModelObject

+static std::vector<PrintObjectTrafoAndInstances> print_objects_from_model_object(const ModelObject &model_object)

+{

+    std::set<PrintObjectTrafoAndInstances> trafos;

+    PrintObjectTrafoAndInstances           trafo;

+    for (ModelInstance *model_instance : model_object.instances)

+        if (model_instance->is_printable()) {

+            trafo.trafo = model_instance->get_matrix();

+            auto shift = Point::new_scale(trafo.trafo.data()[12], trafo.trafo.data()[13]);

+            // Reset the XY axes of the transformation.

+            trafo.trafo.data()[12] = 0;

+            trafo.trafo.data()[13] = 0;

+            // Search or insert a trafo.

+            auto it = trafos.emplace(trafo).first;

+            const_cast<PrintObjectTrafoAndInstances&>(*it).instances.emplace_back(PrintInstance{ nullptr, model_instance, shift });

+        }

+    return std::vector<PrintObjectTrafoAndInstances>(trafos.begin(), trafos.end());

+}

+

+// Compare just the layer ranges and their layer heights, not the associated configs.

+// Ignore the layer heights if check_layer_heights is false.

+static bool layer_height_ranges_equal(const t_layer_config_ranges &lr1, const t_layer_config_ranges &lr2, bool check_layer_height)

+{

+    if (lr1.size() != lr2.size())

+        return false;

+    auto it2 = lr2.begin();

+    for (const auto &kvp1 : lr1) {

+        const auto &kvp2 = *it2 ++;

+        if (std::abs(kvp1.first.first  - kvp2.first.first ) > EPSILON ||

+            std::abs(kvp1.first.second - kvp2.first.second) > EPSILON ||

+            (check_layer_height && std::abs(kvp1.second.option("layer_height")->getFloat() - kvp2.second.option("layer_height")->getFloat()) > EPSILON))

+            return false;

+    }

+    return true;

+}

+

+// Returns true if va == vb when all CustomGCode items that are not ToolChangeCode are ignored.

+static bool custom_per_printz_gcodes_tool_changes_differ(const std::vector<CustomGCode::Item> &va, const std::vector<CustomGCode::Item> &vb)

+{

+	auto it_a = va.begin();

+	auto it_b = vb.begin();

+	while (it_a != va.end() || it_b != vb.end()) {

+		if (it_a != va.end() && it_a->type != CustomGCode::ToolChange) {

+			// Skip any CustomGCode items, which are not tool changes.

+			++ it_a;

+			continue;

+		}

+		if (it_b != vb.end() && it_b->type != CustomGCode::ToolChange) {

+			// Skip any CustomGCode items, which are not tool changes.

+			++ it_b;

+			continue;

+		}

+		if (it_a == va.end() || it_b == vb.end())

+			// va or vb contains more Tool Changes than the other.

+			return true;

+		assert(it_a->type == CustomGCode::ToolChange);

+		assert(it_b->type == CustomGCode::ToolChange);

+		if (*it_a != *it_b)

+			// The two Tool Changes differ.

+			return true;

+		++ it_a;

+		++ it_b;

+	}

+	// There is no change in custom Tool Changes.

+	return false;

+}

+

+// Collect changes to print config, account for overrides of extruder retract values by filament presets.

+static t_config_option_keys print_config_diffs(

+    const PrintConfig        &current_config,

+    const DynamicPrintConfig &new_full_config,

+    DynamicPrintConfig       &filament_overrides)

+{

+    const std::vector<std::string> &extruder_retract_keys = print_config_def.extruder_retract_keys();

+    const std::string               filament_prefix       = "filament_";

+    t_config_option_keys            print_diff;

+    for (const t_config_option_key &opt_key : current_config.keys()) {

+        const ConfigOption *opt_old = current_config.option(opt_key);

+        assert(opt_old != nullptr);

+        const ConfigOption *opt_new = new_full_config.option(opt_key);

+        // assert(opt_new != nullptr);

+        if (opt_new == nullptr)

+            //FIXME This may happen when executing some test cases.

+            continue;

+        const ConfigOption *opt_new_filament = std::binary_search(extruder_retract_keys.begin(), extruder_retract_keys.end(), opt_key) ? new_full_config.option(filament_prefix + opt_key) : nullptr;

+        if (opt_new_filament != nullptr && ! opt_new_filament->is_nil()) {

+            // An extruder retract override is available at some of the filament presets.

+            bool overriden = opt_new->overriden_by(opt_new_filament);

+            if (overriden || *opt_old != *opt_new) {

+                auto opt_copy = opt_new->clone();

+                opt_copy->apply_override(opt_new_filament);

+                bool changed = *opt_old != *opt_copy;

+                if (changed)

+                    print_diff.emplace_back(opt_key);

+                if (changed || overriden) {

+                    // filament_overrides will be applied to the placeholder parser, which layers these parameters over full_print_config.

+                    filament_overrides.set_key_value(opt_key, opt_copy);

+                } else

+                    delete opt_copy;

+            }

+        } else if (*opt_new != *opt_old)

+            print_diff.emplace_back(opt_key);

+    }

+

+    return print_diff;

+}

+

+// Prepare for storing of the full print config into new_full_config to be exported into the G-code and to be used by the PlaceholderParser.

+static t_config_option_keys full_print_config_diffs(const DynamicPrintConfig &current_full_config, const DynamicPrintConfig &new_full_config)

+{

+    t_config_option_keys full_config_diff;

+    for (const t_config_option_key &opt_key : new_full_config.keys()) {

+        const ConfigOption *opt_old = current_full_config.option(opt_key);

+        const ConfigOption *opt_new = new_full_config.option(opt_key);

+        if (opt_old == nullptr || *opt_new != *opt_old)

+            full_config_diff.emplace_back(opt_key);

+    }

+    return full_config_diff;

+}

+

+// Repository for solving partial overlaps of ModelObject::layer_config_ranges.

+// Here the const DynamicPrintConfig* point to the config in ModelObject::layer_config_ranges.

+class LayerRanges

+{

+public:

+    struct LayerRange {

+        t_layer_height_range        layer_height_range;

+        // Config is owned by the associated ModelObject.

+        const DynamicPrintConfig*   config { nullptr };

+

+        bool operator<(const LayerRange &rhs) const throw() { return this->layer_height_range < rhs.layer_height_range; }

+    };

+

+    LayerRanges() = default;

+    LayerRanges(const t_layer_config_ranges &in) { this->assign(in); }

+

+    // Convert input config ranges into continuous non-overlapping sorted vector of intervals and their configs.

+    void assign(const t_layer_config_ranges &in) {

+        m_ranges.clear();

+        m_ranges.reserve(in.size());

+        // Input ranges are sorted lexicographically. First range trims the other ranges.

+        coordf_t last_z = 0;

+        for (const std::pair<const t_layer_height_range, ModelConfig> &range : in)

+            if (range.first.second > last_z) {

+                coordf_t min_z = std::max(range.first.first, 0.);

+                if (min_z > last_z + EPSILON) {

+                    m_ranges.push_back({ t_layer_height_range(last_z, min_z) });

+                    last_z = min_z;

+                }

+                if (range.first.second > last_z + EPSILON) {

+                    const DynamicPrintConfig *cfg = &range.second.get();

+                    m_ranges.push_back({ t_layer_height_range(last_z, range.first.second), cfg });

+                    last_z = range.first.second;

+                }

+            }

+        if (m_ranges.empty())

+            m_ranges.push_back({ t_layer_height_range(0, DBL_MAX) });

+        else if (m_ranges.back().config == nullptr)

+            m_ranges.back().layer_height_range.second = DBL_MAX;

+        else

+            m_ranges.push_back({ t_layer_height_range(m_ranges.back().layer_height_range.second, DBL_MAX) });

+    }

+

+    const DynamicPrintConfig* config(const t_layer_height_range &range) const {

+        auto it = std::lower_bound(m_ranges.begin(), m_ranges.end(), LayerRange{ { range.first - EPSILON, range.second - EPSILON } });

+        // #ys_FIXME_COLOR

+        // assert(it != m_ranges.end());

+        // assert(it == m_ranges.end() || std::abs(it->first.first  - range.first ) < EPSILON);

+        // assert(it == m_ranges.end() || std::abs(it->first.second - range.second) < EPSILON);

+        if (it == m_ranges.end() ||

+            std::abs(it->layer_height_range.first - range.first) > EPSILON ||

+            std::abs(it->layer_height_range.second - range.second) > EPSILON )

+            return nullptr; // desired range doesn't found

+        return it == m_ranges.end() ? nullptr : it->config;

+    }

+

+    std::vector<LayerRange>::const_iterator begin() const { return m_ranges.cbegin(); }

+    std::vector<LayerRange>::const_iterator end  () const { return m_ranges.cend(); }

+    size_t                                  size () const { return m_ranges.size(); }

+

+private:

+    // Layer ranges with their config overrides and list of volumes with their snug bounding boxes in a given layer range.

+    std::vector<LayerRange>  m_ranges;

+};

+

+// To track Model / ModelObject updates between the front end and back end, including layer height ranges, their configs,

+// and snug bounding boxes of ModelVolumes.

+struct ModelObjectStatus {

+    enum Status {

+        Unknown,

+        Old,

+        New,

+        Moved,

+        Deleted,

+    };

+

+    enum class PrintObjectRegionsStatus {

+        Invalid,

+        Valid,

+        PartiallyValid,

+    };

+

+    ModelObjectStatus(ObjectID id, Status status = Unknown) : id(id), status(status) {}

+    ~ModelObjectStatus() { if (print_object_regions) print_object_regions->ref_cnt_dec(); }

+

+    // Key of the set.

+    ObjectID                                    id;

+    // Status of this ModelObject with id on apply().

+    Status                                      status;

+    // PrintObjects to be generated for this ModelObject including their base transformation.

+    std::vector<PrintObjectTrafoAndInstances>   print_instances;

+    // Regions shared by the associated PrintObjects.

+    PrintObjectRegions                         *print_object_regions { nullptr };

+    // Status of the above.

+    PrintObjectRegionsStatus                    print_object_regions_status { PrintObjectRegionsStatus::Invalid };

+

+    // Search by id.

+    bool operator<(const ModelObjectStatus &rhs) const { return id < rhs.id; }

+};

+

+struct ModelObjectStatusDB

+{

+    void add(const ModelObject &model_object, const ModelObjectStatus::Status status) {

+        assert(db.find(ModelObjectStatus(model_object.id())) == db.end());

+        db.emplace(model_object.id(), status);

+    }

+

+    bool add_if_new(const ModelObject &model_object, const ModelObjectStatus::Status status) {

+        auto it = db.find(ModelObjectStatus(model_object.id()));

+        if (it == db.end()) {

+            db.emplace_hint(it, model_object.id(), status);

+            return true;

+        }

+        return false;

+    }

+

+    const ModelObjectStatus& get(const ModelObject &model_object) {

+        auto it = db.find(ModelObjectStatus(model_object.id()));

+        assert(it != db.end());

+        return *it;

+    }

+

+    const ModelObjectStatus& reuse(const ModelObject &model_object) {

+        const ModelObjectStatus &result = this->get(model_object);

+        assert(result.status != ModelObjectStatus::Deleted);

+        return result;

+    }

+

+    std::set<ModelObjectStatus> db;

+};

+

+struct PrintObjectStatus {

+    enum Status {

+        Unknown,

+        Deleted,

+        Reused,

+        New

+    };

+

+    PrintObjectStatus(PrintObject *print_object, Status status = Unknown) : 

+        id(print_object->model_object()->id()),

+        print_object(print_object),

+        trafo(print_object->trafo()),

+        status(status) {}

+    PrintObjectStatus(ObjectID id) : id(id), print_object(nullptr), trafo(Transform3d::Identity()), status(Unknown) {}

+

+    // ID of the ModelObject & PrintObject

+    ObjectID         id;

+    // Pointer to the old PrintObject

+    PrintObject     *print_object;

+    // Trafo generated with model_object->world_matrix(true) 

+    Transform3d      trafo;

+    Status           status;

+

+    // Search by id.

+    bool operator<(const PrintObjectStatus &rhs) const { return id < rhs.id; }

+};

+

+class PrintObjectStatusDB {

+public:

+    using iterator          = std::multiset<PrintObjectStatus>::iterator;

+    using const_iterator    = std::multiset<PrintObjectStatus>::const_iterator;

+

+    PrintObjectStatusDB(const PrintObjectPtrs &print_objects) {

+        for (PrintObject *print_object : print_objects)

+            m_db.emplace(PrintObjectStatus(print_object));

+    }

+

+    struct iterator_range : std::pair<const_iterator, const_iterator>

+    { 

+        using std::pair<const_iterator, const_iterator>::pair;

+        iterator_range(const std::pair<const_iterator, const_iterator> in) : std::pair<const_iterator, const_iterator>(in) {}

+

+        const_iterator begin() throw() { return this->first; }

+        const_iterator end() throw() { return this->second; }

+    };

+

+    iterator_range get_range(const ModelObject &model_object) const {

+        return m_db.equal_range(PrintObjectStatus(model_object.id()));

+    }

+

+    iterator_range get_range(const ModelObjectStatus &model_object_status) const {

+        return m_db.equal_range(PrintObjectStatus(model_object_status.id));

+    }

+

+    size_t count(const ModelObject &model_object) {

+        return m_db.count(PrintObjectStatus(model_object.id()));

+    }

+

+    std::multiset<PrintObjectStatus>::iterator begin() { return m_db.begin(); }

+    std::multiset<PrintObjectStatus>::iterator end()   { return m_db.end(); }

+

+    void clear() {

+        m_db.clear();

+    }

+

+private:

+    std::multiset<PrintObjectStatus> m_db;

+};

+

+static inline bool model_volume_solid_or_modifier(const ModelVolume &mv)

+{

+    ModelVolumeType type = mv.type();

+    return type == ModelVolumeType::MODEL_PART || type == ModelVolumeType::NEGATIVE_VOLUME || type == ModelVolumeType::PARAMETER_MODIFIER;

+}

+

+static inline Transform3f trafo_for_bbox(const Transform3d &object_trafo, const Transform3d &volume_trafo)

+{

+    Transform3d m = object_trafo * volume_trafo;

+    m.translation().x() = 0.;

+    m.translation().y() = 0.;

+    return m.cast<float>();

+}

+

+static inline bool trafos_differ_in_rotation_by_z_and_mirroring_by_xy_only(const Transform3d &t1, const Transform3d &t2)

+{

+    if (std::abs(t1.translation().z() - t2.translation().z()) > EPSILON)

+        // One of the object is higher than the other above the build plate (or below the build plate).

+        return false;

+    Matrix3d m1 = t1.matrix().block<3, 3>(0, 0);

+    Matrix3d m2 = t2.matrix().block<3, 3>(0, 0);

+    Matrix3d m = m2.inverse() * m1;

+    Vec3d    z = m.block<3, 1>(0, 2);

+    if (std::abs(z.x()) > EPSILON || std::abs(z.y()) > EPSILON || std::abs(z.z() - 1.) > EPSILON)

+        // Z direction or length changed.

+        return false;

+    // Z still points in the same direction and it has the same length.

+    Vec3d    x = m.block<3, 1>(0, 0);

+    Vec3d    y = m.block<3, 1>(0, 1);

+    if (std::abs(x.z()) > EPSILON || std::abs(y.z()) > EPSILON)

+        return false;

+    double   lx2 = x.squaredNorm();

+    double   ly2 = y.squaredNorm();

+    if (lx2 - 1. > EPSILON * EPSILON || ly2 - 1. > EPSILON * EPSILON)

+        return false;

+    // Verify whether the vectors x, y are still perpendicular.

+    double   d   = x.dot(y);

+    return std::abs(d * d) < EPSILON * lx2 * ly2;

+}

+

+static PrintObjectRegions::BoundingBox transformed_its_bbox2d(const indexed_triangle_set &its, const Transform3f &m, float offset)

+{

+    assert(! its.indices.empty());

+

+    PrintObjectRegions::BoundingBox bbox(m * its.vertices[its.indices.front()(0)]);

+    for (const stl_triangle_vertex_indices &tri : its.indices)

+        for (int i = 0; i < 3; ++ i)

+            bbox.extend(m * its.vertices[tri(i)]);

+    bbox.min() -= Vec3f(offset, offset, float(EPSILON));

+    bbox.max() += Vec3f(offset, offset, float(EPSILON));

+    return bbox;

+}

+

+static void transformed_its_bboxes_in_z_ranges(

+    const indexed_triangle_set                                    &its, 

+    const Transform3f                                             &m,

+    const std::vector<t_layer_height_range>                       &z_ranges,

+    std::vector<std::pair<PrintObjectRegions::BoundingBox, bool>> &bboxes,

+    const float                                                    offset)

+{

+    bboxes.assign(z_ranges.size(), std::make_pair(PrintObjectRegions::BoundingBox(), false));

+    for (const stl_triangle_vertex_indices &tri : its.indices) {

+        const Vec3f pts[3] = { m * its.vertices[tri(0)], m * its.vertices[tri(1)], m * its.vertices[tri(2)] };

+        for (size_t irange = 0; irange < z_ranges.size(); ++ irange) {

+            const t_layer_height_range                       &z_range = z_ranges[irange];

+            std::pair<PrintObjectRegions::BoundingBox, bool> &bbox    = bboxes[irange];

+            auto bbox_extend = [&bbox](const Vec3f& p) {

+                if (bbox.second) {

+                    bbox.first.extend(p);

+                } else {

+                    bbox.first.min() = bbox.first.max() = p;

+                    bbox.second = true;

+                }

+            };

+            int iprev = 2;

+            for (int iedge = 0; iedge < 3; ++ iedge) {

+                const Vec3f *p1 = &pts[iprev];

+                const Vec3f *p2 = &pts[iedge];

+                // Sort the edge points by Z.

+                if (p1->z() > p2->z())

+                    std::swap(p1, p2);

+                if (p2->z() <= z_range.first || p1->z() >= z_range.second) {

+                    // Out of this slab.

+                } else if (p1->z() < z_range.first) {

+                    if (p1->z() > z_range.second) {

+                        // Two intersections.

+                        float zspan = p2->z() - p1->z();

+                        float t1 = (z_range.first - p1->z())  / zspan;

+                        float t2 = (z_range.second - p1->z()) / zspan;

+                        Vec2f p = to_2d(*p1);

+                        Vec2f v(p2->x() - p1->x(), p2->y() - p1->y());

+                        bbox_extend(to_3d((p + v * t1).eval(), float(z_range.first)));

+                        bbox_extend(to_3d((p + v * t2).eval(), float(z_range.second)));

+                    } else {

+                        // Single intersection with the lower limit.

+                        float t = (z_range.first - p1->z()) / (p2->z() - p1->z());

+                        Vec2f v(p2->x() - p1->x(), p2->y() - p1->y());

+                        bbox_extend(to_3d((to_2d(*p1) + v * t).eval(), float(z_range.first)));

+                        bbox_extend(*p2);

+                    }

+                } else if (p2->z() > z_range.second) {

+                    // Single intersection with the upper limit.

+                    float t = (z_range.second - p1->z()) / (p2->z() - p1->z());

+                    Vec2f v(p2->x() - p1->x(), p2->y() - p1->y());

+                    bbox_extend(to_3d((to_2d(*p1) + v * t).eval(), float(z_range.second)));

+                    bbox_extend(*p1);

+                } else {

+                    // Both points are inside.

+                    bbox_extend(*p1);

+                    bbox_extend(*p2);

+                }

+                iprev = iedge;

+            }

+        }

+    }

+

+    for (std::pair<PrintObjectRegions::BoundingBox, bool> &bbox : bboxes) {

+        bbox.first.min() -= Vec3f(offset, offset, float(EPSILON));

+        bbox.first.max() += Vec3f(offset, offset, float(EPSILON));

+    }

+}

+

+// Last PrintObject for this print_object_regions has been fully invalidated (deleted).

+// Keep print_object_regions, but delete those volumes, which were either removed from new_volumes, or which rotated or scaled, so they need

+// their bounding boxes to be recalculated.

+void print_objects_regions_invalidate_keep_some_volumes(PrintObjectRegions &print_object_regions, ModelVolumePtrs old_volumes, ModelVolumePtrs new_volumes)

+{

+    print_object_regions.all_regions.clear();

+

+    model_volumes_sort_by_id(old_volumes);

+    model_volumes_sort_by_id(new_volumes);

+

+    size_t i_cached_volume      = 0;

+    size_t last_cached_volume   = 0;

+    size_t i_old                = 0;

+    for (size_t i_new = 0; i_new < new_volumes.size(); ++ i_new)

+        if (model_volume_solid_or_modifier(*new_volumes[i_new])) {

+            for (; i_old < old_volumes.size(); ++ i_old)

+                if (old_volumes[i_old]->id() >= new_volumes[i_new]->id())

+                    break;

+            if (i_old != old_volumes.size() && old_volumes[i_old]->id() == new_volumes[i_new]->id()) {

+                if (old_volumes[i_old]->get_matrix().isApprox(new_volumes[i_new]->get_matrix())) {

+                    // Reuse the volume.

+                    for (; print_object_regions.cached_volume_ids[i_cached_volume] < old_volumes[i_old]->id(); ++ i_cached_volume)

+                        assert(i_cached_volume < print_object_regions.cached_volume_ids.size());

+                    assert(i_cached_volume < print_object_regions.cached_volume_ids.size() && print_object_regions.cached_volume_ids[i_cached_volume] == old_volumes[i_old]->id());

+                    print_object_regions.cached_volume_ids[last_cached_volume ++] = print_object_regions.cached_volume_ids[i_cached_volume ++];

+                } else {

+                    // Don't reuse the volume.

+                }

+            }

+        }

+    print_object_regions.cached_volume_ids.erase(print_object_regions.cached_volume_ids.begin() + last_cached_volume, print_object_regions.cached_volume_ids.end());

+}

+

+// Find a bounding box of a volume's part intersecting layer_range. Such a bounding box will likely be smaller in XY than the full bounding box,

+// thus it will intersect with lower number of other volumes.

+const PrintObjectRegions::BoundingBox* find_volume_extents(const PrintObjectRegions::LayerRangeRegions &layer_range, const ModelVolume &volume)

+{

+    auto it = lower_bound_by_predicate(layer_range.volumes.begin(), layer_range.volumes.end(), [&volume](const PrintObjectRegions::VolumeExtents &l){ return l.volume_id < volume.id(); });

+    return it != layer_range.volumes.end() && it->volume_id == volume.id() ? &it->bbox : nullptr;

+}

+

+// Find a bounding box of a topmost printable volume referenced by this modifier given this_region_id.

+PrintObjectRegions::BoundingBox find_modifier_volume_extents(const PrintObjectRegions::LayerRangeRegions &layer_range, const int this_region_id)

+{

+    // Find the top-most printable volume of this modifier, or the printable volume itself.

+    const PrintObjectRegions::VolumeRegion &this_region = layer_range.volume_regions[this_region_id];

+    const PrintObjectRegions::BoundingBox *this_extents = find_volume_extents(layer_range, *this_region.model_volume);

+    assert(this_extents);

+    PrintObjectRegions::BoundingBox out { *this_extents };

+    if (! this_region.model_volume->is_model_part())

+        for (int parent_region_id = this_region.parent;;) {

+            assert(parent_region_id >= 0);

+            const PrintObjectRegions::VolumeRegion &parent_region  = layer_range.volume_regions[parent_region_id];

+            const PrintObjectRegions::BoundingBox  *parent_extents = find_volume_extents(layer_range, *parent_region.model_volume);

+            assert(parent_extents);

+            out.extend(*parent_extents);

+            if (parent_region.model_volume->is_model_part())

+                break;

+            parent_region_id = parent_region.parent;

+        }

+    return out;

+}

+

+PrintRegionConfig region_config_from_model_volume(const PrintRegionConfig &default_or_parent_region_config, const DynamicPrintConfig *layer_range_config, const ModelVolume &volume, size_t num_extruders);

+

+void print_region_ref_inc(PrintRegion &r) { ++ r.m_ref_cnt; }

+void print_region_ref_reset(PrintRegion &r) { r.m_ref_cnt = 0; }

+int  print_region_ref_cnt(const PrintRegion &r) { return r.m_ref_cnt; }

+

+// Verify whether the PrintRegions of a PrintObject are still valid, possibly after updating the region configs.

+// Before region configs are updated, callback_invalidate() is called to possibly stop background processing.

+// Returns false if this object needs to be resliced because regions were merged or split.

+bool verify_update_print_object_regions(

+    ModelVolumePtrs                     model_volumes,

+    const PrintRegionConfig            &default_region_config,

+    size_t                              num_extruders,

+    const std::vector<unsigned int>    &painting_extruders,

+    PrintObjectRegions                 &print_object_regions,

+    const std::function<void(const PrintRegionConfig&, const PrintRegionConfig&, const t_config_option_keys&)> &callback_invalidate)

+{

+    // Sort by ModelVolume ID.

+    model_volumes_sort_by_id(model_volumes);

+

+    for (std::unique_ptr<PrintRegion> &region : print_object_regions.all_regions)

+        print_region_ref_reset(*region);

+

+    // Verify and / or update PrintRegions produced by ModelVolumes, layer range modifiers, modifier volumes.

+    for (PrintObjectRegions::LayerRangeRegions &layer_range : print_object_regions.layer_ranges) {

+        // Each modifier ModelVolume intersecting this layer_range shall be referenced here at least once if it intersects some

+        // printable ModelVolume at this layer_range even if it does not modify its overlapping printable ModelVolume configuration yet.

+        // VolumeRegions reference ModelVolumes in layer_range.volume_regions the order they are stored in ModelObject volumes.

+        // Remember whether a given modifier ModelVolume was visited already.

+        auto it_model_volume_modifier_last = model_volumes.end();

+        for (PrintObjectRegions::VolumeRegion &region : layer_range.volume_regions)

+            if (region.model_volume->is_model_part() || region.model_volume->is_modifier()) {

+                auto it_model_volume = lower_bound_by_predicate(model_volumes.begin(), model_volumes.end(), [&region](const ModelVolume *l){ return l->id() < region.model_volume->id(); });

+                assert(it_model_volume != model_volumes.end() && (*it_model_volume)->id() == region.model_volume->id());

+                if (region.model_volume->is_modifier() && it_model_volume != it_model_volume_modifier_last) {

+                    // A modifier ModelVolume is visited for the first time.

+                    // A visited modifier may not have had parent volume_regions created overlapping with some model parts or modifiers,

+                    // if the visited modifier did not modify their properties. Now the visited modifier's configuration may have changed,

+                    // which may require new regions to be created.

+                    it_model_volume_modifier_last = it_model_volume;

+                    int next_region_id = int(&region - layer_range.volume_regions.data());

+                    const PrintObjectRegions::BoundingBox *bbox = find_volume_extents(layer_range, *region.model_volume);

+                    assert(bbox);

+                    for (int parent_region_id = next_region_id - 1; parent_region_id >= 0; -- parent_region_id) {

+                        const PrintObjectRegions::VolumeRegion &parent_region = layer_range.volume_regions[parent_region_id];

+                        assert(parent_region.model_volume != region.model_volume);

+                        if (parent_region.model_volume->is_model_part() || parent_region.model_volume->is_modifier()) {

+                            // volume_regions are produced in decreasing order of parent volume_regions ids.

+                            // Some regions may not have been generated the last time by generate_print_object_regions().

+                            assert(next_region_id == int(layer_range.volume_regions.size()) ||

+                                   layer_range.volume_regions[next_region_id].model_volume != region.model_volume ||

+                                   layer_range.volume_regions[next_region_id].parent <= parent_region_id);

+                            if (next_region_id < int(layer_range.volume_regions.size()) && 

+                                layer_range.volume_regions[next_region_id].model_volume == region.model_volume &&

+                                layer_range.volume_regions[next_region_id].parent == parent_region_id) {

+                                // A parent region is already overridden.

+                                ++ next_region_id;

+                            } else if (PrintObjectRegions::BoundingBox parent_bbox = find_modifier_volume_extents(layer_range, parent_region_id); parent_bbox.intersects(*bbox))

+                                // Such parent region does not exist. If it is needed, then we need to reslice.

+                                // Only create new region for a modifier, which actually modifies config of it's parent.

+                                if (PrintRegionConfig config = region_config_from_model_volume(parent_region.region->config(), nullptr, **it_model_volume, num_extruders);

+                                    config != parent_region.region->config())

+                                    // This modifier newly overrides a region, which it did not before. We need to reslice.

+                                    return false;

+                        }

+                    }

+                }

+                PrintRegionConfig cfg = region.parent == -1 ?

+                    region_config_from_model_volume(default_region_config, layer_range.config, **it_model_volume, num_extruders) :

+                    region_config_from_model_volume(layer_range.volume_regions[region.parent].region->config(), nullptr, **it_model_volume, num_extruders);

+                if (cfg != region.region->config()) {

+                    // Region configuration changed.

+                    if (print_region_ref_cnt(*region.region) == 0) {

+                        // Region is referenced for the first time. Just change its parameters.

+                        // Stop the background process before assigning new configuration to the regions.

+                        t_config_option_keys diff = region.region->config().diff(cfg);

+                        callback_invalidate(region.region->config(), cfg, diff);

+                        region.region->config_apply_only(cfg, diff, false);

+                    } else {

+                        // Region is referenced multiple times, thus the region is being split. We need to reslice.

+                        return false;

+                    }

+                }

+                print_region_ref_inc(*region.region);

+            }

+    }

+

+    // Verify and / or update PrintRegions produced by color painting. 

+    for (const PrintObjectRegions::LayerRangeRegions &layer_range : print_object_regions.layer_ranges)

+        for (const PrintObjectRegions::PaintedRegion &region : layer_range.painted_regions) {

+            const PrintObjectRegions::VolumeRegion &parent_region   = layer_range.volume_regions[region.parent];

+            PrintRegionConfig                       cfg             = parent_region.region->config();

+            cfg.perimeter_extruder.value    = region.extruder_id;

+            cfg.solid_infill_extruder.value = region.extruder_id;

+            cfg.infill_extruder.value       = region.extruder_id;

+            if (cfg != region.region->config()) {

+                // Region configuration changed.

+                if (print_region_ref_cnt(*region.region) == 0) {

+                    // Region is referenced for the first time. Just change its parameters.

+                    // Stop the background process before assigning new configuration to the regions.

+                    t_config_option_keys diff = region.region->config().diff(cfg);

+                    callback_invalidate(region.region->config(), cfg, diff);

+                    region.region->config_apply_only(cfg, diff, false);

+                } else {

+                    // Region is referenced multiple times, thus the region is being split. We need to reslice.

+                    return false;

+                }

+            }

+            print_region_ref_inc(*region.region);

+        }

+

+    // Lastly verify, whether some regions were not merged.

+    {

+        std::vector<const PrintRegion*> regions;

+        regions.reserve(print_object_regions.all_regions.size());

+        for (std::unique_ptr<PrintRegion> &region : print_object_regions.all_regions) {

+            assert(print_region_ref_cnt(*region) > 0);

+            regions.emplace_back(&(*region.get()));

+        }

+        std::sort(regions.begin(), regions.end(), [](const PrintRegion *l, const PrintRegion *r){ return l->config_hash() < r->config_hash(); });

+        for (size_t i = 0; i < regions.size(); ++ i) {

+            size_t hash = regions[i]->config_hash();

+            size_t j = i;

+            for (++ j; j < regions.size() && regions[j]->config_hash() == hash; ++ j)

+                if (regions[i]->config() == regions[j]->config()) {

+                    // Regions were merged. We need to reslice.

+                    return false;

+                }

+        }

+    }

+

+    return true;

+}

+

+// Update caches of volume bounding boxes.

+void update_volume_bboxes(

+    std::vector<PrintObjectRegions::LayerRangeRegions>  &layer_ranges,

+    std::vector<ObjectID>                               &cached_volume_ids,

+    ModelVolumePtrs                                      model_volumes,

+    const Transform3d                                   &object_trafo, 

+    const float                                          offset)

+{

+    // output will be sorted by the order of model_volumes sorted by their ObjectIDs.

+    model_volumes_sort_by_id(model_volumes);

+

+    if (layer_ranges.size() == 1) {

+        PrintObjectRegions::LayerRangeRegions &layer_range = layer_ranges.front();

+        std::vector<PrintObjectRegions::VolumeExtents> volumes_old(std::move(layer_range.volumes));

+        layer_range.volumes.reserve(model_volumes.size());

+        for (const ModelVolume *model_volume : model_volumes)

+            if (model_volume_solid_or_modifier(*model_volume)) {

+                if (std::binary_search(cached_volume_ids.begin(), cached_volume_ids.end(), model_volume->id())) {

+                    auto it = lower_bound_by_predicate(volumes_old.begin(), volumes_old.end(), [model_volume](PrintObjectRegions::VolumeExtents &l) { return l.volume_id < model_volume->id(); });

+                    if (it != volumes_old.end() && it->volume_id == model_volume->id())

+                        layer_range.volumes.emplace_back(*it);

+                } else

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    layer_range.volumes.push_back({ model_volume->id(),

+                        transformed_its_bbox2d(model_volume->mesh().its, trafo_for_bbox(object_trafo, model_volume->get_matrix()), offset) });

+#else

+                    layer_range.volumes.push_back({ model_volume->id(),

+                        transformed_its_bbox2d(model_volume->mesh().its, trafo_for_bbox(object_trafo, model_volume->get_matrix(false)), offset) });

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+            }

+    } else {

+        std::vector<std::vector<PrintObjectRegions::VolumeExtents>> volumes_old;

+        if (cached_volume_ids.empty())

+            for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges)

+                layer_range.volumes.clear();

+        else {

+            volumes_old.reserve(layer_ranges.size());

+            for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges)

+                volumes_old.emplace_back(std::move(layer_range.volumes));

+        }

+

+        std::vector<std::pair<PrintObjectRegions::BoundingBox, bool>> bboxes;

+        std::vector<t_layer_height_range>                             ranges;

+        ranges.reserve(layer_ranges.size());

+        for (const PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges) {

+            t_layer_height_range r = layer_range.layer_height_range;

+            r.first  -= EPSILON;

+            r.second += EPSILON;

+            ranges.emplace_back(r);

+        }

+        for (const ModelVolume *model_volume : model_volumes)

+            if (model_volume_solid_or_modifier(*model_volume)) {

+                if (std::binary_search(cached_volume_ids.begin(), cached_volume_ids.end(), model_volume->id())) {

+                    for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges) {

+                        const auto &vold = volumes_old[&layer_range - layer_ranges.data()];

+                        auto it = lower_bound_by_predicate(vold.begin(), vold.end(), [model_volume](const PrintObjectRegions::VolumeExtents &l) { return l.volume_id < model_volume->id(); });

+                        if (it != vold.end() && it->volume_id == model_volume->id())

+                            layer_range.volumes.emplace_back(*it);

+                    }

+                } else {

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    transformed_its_bboxes_in_z_ranges(model_volume->mesh().its, trafo_for_bbox(object_trafo, model_volume->get_matrix()), ranges, bboxes, offset);

+#else

+                    transformed_its_bboxes_in_z_ranges(model_volume->mesh().its, trafo_for_bbox(object_trafo, model_volume->get_matrix(false)), ranges, bboxes, offset);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges)

+                        if (auto &bbox = bboxes[&layer_range - layer_ranges.data()]; bbox.second)

+                            layer_range.volumes.push_back({ model_volume->id(), bbox.first });

+                }

+            }

+    }

+

+    cached_volume_ids.clear();

+    cached_volume_ids.reserve(model_volumes.size());

+    for (const ModelVolume *v : model_volumes)

+        if (model_volume_solid_or_modifier(*v))

+            cached_volume_ids.emplace_back(v->id());

+}

+

+// Either a fresh PrintObject, or PrintObject regions were invalidated (merged, split).

+// Generate PrintRegions from scratch.

+static PrintObjectRegions* generate_print_object_regions(

+    PrintObjectRegions                          *print_object_regions_old,

+    const ModelVolumePtrs                       &model_volumes,

+    const LayerRanges                           &model_layer_ranges,

+    const PrintRegionConfig                     &default_region_config,

+    const Transform3d                           &trafo,

+    size_t                                       num_extruders,

+    const float                                  xy_size_compensation,

+    const std::vector<unsigned int>             &painting_extruders)

+{

+    // Reuse the old object or generate a new one.

+    auto out = print_object_regions_old ? std::unique_ptr<PrintObjectRegions>(print_object_regions_old) : std::make_unique<PrintObjectRegions>();

+    auto &all_regions          = out->all_regions;

+    auto &layer_ranges_regions = out->layer_ranges;

+

+    all_regions.clear();

+

+    bool reuse_old = print_object_regions_old && !print_object_regions_old->layer_ranges.empty();

+

+    if (reuse_old) {

+        // Reuse old bounding boxes of some ModelVolumes and their ranges.

+        // Verify that the old ranges match the new ranges.

+        assert(model_layer_ranges.size() == layer_ranges_regions.size());

+        for (const auto &range : model_layer_ranges) {

+            PrintObjectRegions::LayerRangeRegions &r = layer_ranges_regions[&range - &*model_layer_ranges.begin()];

+            assert(range.layer_height_range == r.layer_height_range);

+            // If model::assign_copy() is called, layer_ranges_regions is copied thus the pointers to configs are lost.

+            r.config = range.config;

+            r.volume_regions.clear();

+            r.painted_regions.clear();

+        }

+    } else {

+        out->trafo_bboxes = trafo;

+        layer_ranges_regions.reserve(model_layer_ranges.size());

+        for (const auto &range : model_layer_ranges)

+            layer_ranges_regions.push_back({ range.layer_height_range, range.config });

+    }

+

+    const bool is_mm_painted = num_extruders > 1 && std::any_of(model_volumes.cbegin(), model_volumes.cend(), [](const ModelVolume *mv) { return mv->is_mm_painted(); });

+    update_volume_bboxes(layer_ranges_regions, out->cached_volume_ids, model_volumes, out->trafo_bboxes, is_mm_painted ? 0.f : std::max(0.f, xy_size_compensation));

+

+    std::vector<PrintRegion*> region_set;

+    auto get_create_region = [&region_set, &all_regions](PrintRegionConfig &&config) -> PrintRegion* {

+        size_t hash = config.hash();

+        auto it = Slic3r::lower_bound_by_predicate(region_set.begin(), region_set.end(), [&config, hash](const PrintRegion* l) {

+            return l->config_hash() < hash || (l->config_hash() == hash && l->config() < config); });

+        if (it != region_set.end() && (*it)->config_hash() == hash && (*it)->config() == config)

+            return *it;

+        // Insert into a sorted array, it has O(n) complexity, but the calling algorithm has an O(n^2*log(n)) complexity anyways.

+        all_regions.emplace_back(std::make_unique<PrintRegion>(std::move(config), hash, int(all_regions.size())));

+        PrintRegion *region = all_regions.back().get();

+        region_set.emplace(it, region);

+        return region;

+    };

+

+    // Chain the regions in the order they are stored in the volumes list.

+    for (int volume_id = 0; volume_id < int(model_volumes.size()); ++ volume_id) {

+        const ModelVolume &volume = *model_volumes[volume_id];

+        if (model_volume_solid_or_modifier(volume)) {

+            for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges_regions)

+                if (const PrintObjectRegions::BoundingBox *bbox = find_volume_extents(layer_range, volume); bbox) {

+                    if (volume.is_model_part()) {

+                        // Add a model volume, assign an existing region or generate a new one.

+                        layer_range.volume_regions.push_back({

+                            &volume, -1,

+                            get_create_region(region_config_from_model_volume(default_region_config, layer_range.config, volume, num_extruders)),

+                            bbox

+                        });

+                    } else if (volume.is_negative_volume()) {

+                        // Add a negative (subtractor) volume. Such volume has neither region nor parent volume assigned.

+                        layer_range.volume_regions.push_back({ &volume, -1, nullptr, bbox });

+                    } else {

+                        assert(volume.is_modifier());

+                        // Modifiers may be chained one over the other. Check for overlap, merge DynamicPrintConfigs.

+                        bool added = false;

+                        int  parent_model_part_id = -1;

+                        for (int parent_region_id = int(layer_range.volume_regions.size()) - 1; parent_region_id >= 0; -- parent_region_id) {

+                            const PrintObjectRegions::VolumeRegion &parent_region = layer_range.volume_regions[parent_region_id];

+                            const ModelVolume                      &parent_volume = *parent_region.model_volume;

+                            if (parent_volume.is_model_part() || parent_volume.is_modifier())

+                                if (PrintObjectRegions::BoundingBox parent_bbox = find_modifier_volume_extents(layer_range, parent_region_id); parent_bbox.intersects(*bbox)) {

+                                    // Only create new region for a modifier, which actually modifies config of it's parent.

+                                    if (PrintRegionConfig config = region_config_from_model_volume(parent_region.region->config(), nullptr, volume, num_extruders); 

+                                        config != parent_region.region->config()) {

+                                        added = true;

+                                        layer_range.volume_regions.push_back({ &volume, parent_region_id, get_create_region(std::move(config)), bbox });

+                                    } else if (parent_model_part_id == -1 && parent_volume.is_model_part())

+                                        parent_model_part_id = parent_region_id;

+                                }

+                        }

+                        if (! added && parent_model_part_id >= 0)

+                            // This modifier does not override any printable volume's configuration, however it may in the future.

+                            // Store it so that verify_update_print_object_regions() will handle this modifier correctly if its configuration changes.

+                            layer_range.volume_regions.push_back({ &volume, parent_model_part_id, layer_range.volume_regions[parent_model_part_id].region, bbox });

+                    }

+                }

+            }

+    }

+

+    // Finally add painting regions.

+    for (PrintObjectRegions::LayerRangeRegions &layer_range : layer_ranges_regions) {

+        for (unsigned int painted_extruder_id : painting_extruders)

+            for (int parent_region_id = 0; parent_region_id < int(layer_range.volume_regions.size()); ++ parent_region_id)

+                if (const PrintObjectRegions::VolumeRegion &parent_region = layer_range.volume_regions[parent_region_id];

+                    parent_region.model_volume->is_model_part() || parent_region.model_volume->is_modifier()) {

+                    PrintRegionConfig cfg = parent_region.region->config();

+                    cfg.perimeter_extruder.value    = painted_extruder_id;

+                    cfg.solid_infill_extruder.value = painted_extruder_id;

+                    cfg.infill_extruder.value       = painted_extruder_id;

+                    layer_range.painted_regions.push_back({ painted_extruder_id, parent_region_id, get_create_region(std::move(cfg))});

+                }

+        // Sort the regions by parent region::print_object_region_id() and extruder_id to help the slicing algorithm when applying MMU segmentation.

+        std::sort(layer_range.painted_regions.begin(), layer_range.painted_regions.end(), [&layer_range](auto &l, auto &r) {

+            int lid = layer_range.volume_regions[l.parent].region->print_object_region_id();

+            int rid = layer_range.volume_regions[r.parent].region->print_object_region_id();

+            return lid < rid || (lid == rid && l.extruder_id < r.extruder_id); });

+    }

+

+    return out.release();

+}

+

+Print::ApplyStatus Print::apply(const Model &model, DynamicPrintConfig new_full_config)

+{

+#ifdef _DEBUG

+    check_model_ids_validity(model);

+#endif /* _DEBUG */

+

+    // Normalize the config.

+	new_full_config.option("print_settings_id",            true);

+	new_full_config.option("filament_settings_id",         true);

+	new_full_config.option("printer_settings_id",          true);

+    new_full_config.option("physical_printer_settings_id", true);

+    new_full_config.normalize_fdm();

+

+    // Find modified keys of the various configs. Resolve overrides extruder retract values by filament profiles.

+    DynamicPrintConfig   filament_overrides;

+    t_config_option_keys print_diff       = print_config_diffs(m_config, new_full_config, filament_overrides);

+    t_config_option_keys full_config_diff = full_print_config_diffs(m_full_print_config, new_full_config);

+    // Collect changes to object and region configs.

+    t_config_option_keys object_diff      = m_default_object_config.diff(new_full_config);

+    t_config_option_keys region_diff      = m_default_region_config.diff(new_full_config);

+

+    // Do not use the ApplyStatus as we will use the max function when updating apply_status.

+    unsigned int apply_status = APPLY_STATUS_UNCHANGED;

+    auto update_apply_status = [&apply_status](bool invalidated)

+        { apply_status = std::max<unsigned int>(apply_status, invalidated ? APPLY_STATUS_INVALIDATED : APPLY_STATUS_CHANGED); };

+    if (! (print_diff.empty() && object_diff.empty() && region_diff.empty()))

+        update_apply_status(false);

+

+    // Grab the lock for the Print / PrintObject milestones.

+	std::scoped_lock<std::mutex> lock(this->state_mutex());

+

+    // The following call may stop the background processing.

+    if (! print_diff.empty())

+        update_apply_status(this->invalidate_state_by_config_options(new_full_config, print_diff));

+

+    // Apply variables to placeholder parser. The placeholder parser is used by G-code export,

+    // which should be stopped if print_diff is not empty.

+    size_t num_extruders = m_config.nozzle_diameter.size();

+    bool   num_extruders_changed = false;

+    if (! full_config_diff.empty()) {

+        update_apply_status(this->invalidate_step(psGCodeExport));

+        m_placeholder_parser.clear_config();

+        // Set the profile aliases for the PrintBase::output_filename()

+		m_placeholder_parser.set("print_preset",              new_full_config.option("print_settings_id")->clone());

+		m_placeholder_parser.set("filament_preset",           new_full_config.option("filament_settings_id")->clone());

+		m_placeholder_parser.set("printer_preset",            new_full_config.option("printer_settings_id")->clone());

+        m_placeholder_parser.set("physical_printer_preset",   new_full_config.option("physical_printer_settings_id")->clone());

+		// We want the filament overrides to be applied over their respective extruder parameters by the PlaceholderParser.

+		// see "Placeholders do not respect filament overrides." GH issue #3649

+		m_placeholder_parser.apply_config(filament_overrides);

+	    // It is also safe to change m_config now after this->invalidate_state_by_config_options() call.

+	    m_config.apply_only(new_full_config, print_diff, true);

+	    //FIXME use move semantics once ConfigBase supports it.

+        // Some filament_overrides may contain values different from new_full_config, but equal to m_config.

+        // As long as these config options don't reallocate memory when copying, we are safe overriding a value, which is in use by a worker thread.

+	    m_config.apply(filament_overrides);

+	    // Handle changes to object config defaults

+	    m_default_object_config.apply_only(new_full_config, object_diff, true);

+	    // Handle changes to regions config defaults

+	    m_default_region_config.apply_only(new_full_config, region_diff, true);

+        m_full_print_config = std::move(new_full_config);

+        if (num_extruders != m_config.nozzle_diameter.size()) {

+            num_extruders = m_config.nozzle_diameter.size();

+            num_extruders_changed = true;

+        }

+    }

+    

+    ModelObjectStatusDB model_object_status_db;

+

+    // 1) Synchronize model objects.

+    bool print_regions_reshuffled = false;

+    if (model.id() != m_model.id()) {

+        // Kill everything, initialize from scratch.

+        // Stop background processing.

+        this->call_cancel_callback();

+        update_apply_status(this->invalidate_all_steps());

+        for (PrintObject *object : m_objects) {

+            model_object_status_db.add(*object->model_object(), ModelObjectStatus::Deleted);

+			update_apply_status(object->invalidate_all_steps());

+			delete object;

+        }

+        m_objects.clear();

+        print_regions_reshuffled = true;

+        m_model.assign_copy(model);

+		for (const ModelObject *model_object : m_model.objects)

+			model_object_status_db.add(*model_object, ModelObjectStatus::New);

+    } else {

+        if (m_model.custom_gcode_per_print_z != model.custom_gcode_per_print_z) {

+            update_apply_status(num_extruders_changed || 

+            	// Tool change G-codes are applied as color changes for a single extruder printer, no need to invalidate tool ordering.

+            	//FIXME The tool ordering may be invalidated unnecessarily if the custom_gcode_per_print_z.mode is not applicable

+            	// to the active print / model state, and then it is reset, so it is being applicable, but empty, thus the effect is the same.

+            	(num_extruders > 1 && custom_per_printz_gcodes_tool_changes_differ(m_model.custom_gcode_per_print_z.gcodes, model.custom_gcode_per_print_z.gcodes)) ?

+            	// The Tool Ordering and the Wipe Tower are no more valid.

+            	this->invalidate_steps({ psWipeTower, psGCodeExport }) :

+            	// There is no change in Tool Changes stored in custom_gcode_per_print_z, therefore there is no need to update Tool Ordering.

+            	this->invalidate_step(psGCodeExport));

+            m_model.custom_gcode_per_print_z = model.custom_gcode_per_print_z;

+        }

+        if (model_object_list_equal(m_model, model)) {

+            // The object list did not change.

+			for (const ModelObject *model_object : m_model.objects)

+				model_object_status_db.add(*model_object, ModelObjectStatus::Old);

+        } else if (model_object_list_extended(m_model, model)) {

+            // Add new objects. Their volumes and configs will be synchronized later.

+            update_apply_status(this->invalidate_step(psGCodeExport));

+            for (const ModelObject *model_object : m_model.objects)

+                model_object_status_db.add(*model_object, ModelObjectStatus::Old);

+            for (size_t i = m_model.objects.size(); i < model.objects.size(); ++ i) {

+                model_object_status_db.add(*model.objects[i], ModelObjectStatus::New);

+                m_model.objects.emplace_back(ModelObject::new_copy(*model.objects[i]));

+				m_model.objects.back()->set_model(&m_model);

+            }

+        } else {

+            // Reorder the objects, add new objects.

+            // First stop background processing before shuffling or deleting the PrintObjects in the object list.

+            this->call_cancel_callback();

+            update_apply_status(this->invalidate_step(psGCodeExport));

+            // Second create a new list of objects.

+            std::vector<ModelObject*> model_objects_old(std::move(m_model.objects));

+            m_model.objects.clear();

+            m_model.objects.reserve(model.objects.size());

+            auto by_id_lower = [](const ModelObject *lhs, const ModelObject *rhs){ return lhs->id() < rhs->id(); };

+            std::sort(model_objects_old.begin(), model_objects_old.end(), by_id_lower);

+            for (const ModelObject *mobj : model.objects) {

+                auto it = std::lower_bound(model_objects_old.begin(), model_objects_old.end(), mobj, by_id_lower);

+                if (it == model_objects_old.end() || (*it)->id() != mobj->id()) {

+                    // New ModelObject added.

+					m_model.objects.emplace_back(ModelObject::new_copy(*mobj));

+					m_model.objects.back()->set_model(&m_model);

+                    model_object_status_db.add(*mobj, ModelObjectStatus::New);

+                } else {

+                    // Existing ModelObject re-added (possibly moved in the list).

+                    m_model.objects.emplace_back(*it);

+                    model_object_status_db.add(*mobj, ModelObjectStatus::Moved);

+                }

+            }

+            bool deleted_any = false;

+			for (ModelObject *&model_object : model_objects_old)

+                if (model_object_status_db.add_if_new(*model_object, ModelObjectStatus::Deleted))

+                    deleted_any = true;

+                else

+                    // Do not delete this ModelObject instance.

+                    model_object = nullptr;

+            if (deleted_any) {

+                // Delete PrintObjects of the deleted ModelObjects.

+                PrintObjectPtrs print_objects_old = std::move(m_objects);

+                m_objects.clear();

+                m_objects.reserve(print_objects_old.size());

+                for (PrintObject *print_object : print_objects_old) {

+                    const ModelObjectStatus &status = model_object_status_db.get(*print_object->model_object());

+                    if (status.status == ModelObjectStatus::Deleted) {

+                        update_apply_status(print_object->invalidate_all_steps());

+                        delete print_object;

+                    } else

+                        m_objects.emplace_back(print_object);

+                }

+                for (ModelObject *model_object : model_objects_old)

+                    delete model_object;

+                print_regions_reshuffled = true;

+            }

+        }

+    }

+

+    // 2) Map print objects including their transformation matrices.

+    PrintObjectStatusDB print_object_status_db(m_objects);

+

+    // 3) Synchronize ModelObjects & PrintObjects.

+    const std::initializer_list<ModelVolumeType> solid_or_modifier_types { ModelVolumeType::MODEL_PART, ModelVolumeType::NEGATIVE_VOLUME, ModelVolumeType::PARAMETER_MODIFIER };

+    for (size_t idx_model_object = 0; idx_model_object < model.objects.size(); ++ idx_model_object) {

+        ModelObject       &model_object        = *m_model.objects[idx_model_object];

+        ModelObjectStatus &model_object_status = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(model_object));

+		const ModelObject &model_object_new    = *model.objects[idx_model_object];

+        if (model_object_status.status == ModelObjectStatus::New)

+            // PrintObject instances will be added in the next loop.

+            continue;

+        // Update the ModelObject instance, possibly invalidate the linked PrintObjects.

+        assert(model_object_status.status == ModelObjectStatus::Old || model_object_status.status == ModelObjectStatus::Moved);

+        // Check whether a model part volume was added or removed, their transformations or order changed.

+        // Only volume IDs, volume types, transformation matrices and their order are checked, configuration and other parameters are NOT checked.

+        bool solid_or_modifier_differ   = model_volume_list_changed(model_object, model_object_new, solid_or_modifier_types) ||

+                                          model_mmu_segmentation_data_changed(model_object, model_object_new) ||

+                                          (model_object_new.is_mm_painted() && num_extruders_changed);

+        bool supports_differ            = model_volume_list_changed(model_object, model_object_new, ModelVolumeType::SUPPORT_BLOCKER) ||

+                                          model_volume_list_changed(model_object, model_object_new, ModelVolumeType::SUPPORT_ENFORCER);

+        bool layer_height_ranges_differ = ! layer_height_ranges_equal(model_object.layer_config_ranges, model_object_new.layer_config_ranges, model_object_new.layer_height_profile.empty());

+        bool model_origin_translation_differ = model_object.origin_translation != model_object_new.origin_translation;

+        auto print_objects_range        = print_object_status_db.get_range(model_object);

+        // The list actually can be empty if all instances are out of the print bed.

+        //assert(print_objects_range.begin() != print_objects_range.end());

+        // All PrintObjects in print_objects_range shall point to the same prints_objects_regions

+        if (print_objects_range.begin() != print_objects_range.end()) {

+            model_object_status.print_object_regions = print_objects_range.begin()->print_object->m_shared_regions;

+            model_object_status.print_object_regions->ref_cnt_inc();

+        }

+        if (solid_or_modifier_differ || model_origin_translation_differ || layer_height_ranges_differ ||

+            ! model_object.layer_height_profile.timestamp_matches(model_object_new.layer_height_profile)) {

+            // The very first step (the slicing step) is invalidated. One may freely remove all associated PrintObjects.

+            model_object_status.print_object_regions_status = 

+                model_object_status.print_object_regions == nullptr || model_origin_translation_differ || layer_height_ranges_differ ?

+                // Drop print_objects_regions.

+                ModelObjectStatus::PrintObjectRegionsStatus::Invalid :

+                // Reuse bounding boxes of print_objects_regions for ModelVolumes with unmodified transformation.

+                ModelObjectStatus::PrintObjectRegionsStatus::PartiallyValid;

+            for (const PrintObjectStatus &print_object_status : print_objects_range) {

+                update_apply_status(print_object_status.print_object->invalidate_all_steps());

+                const_cast<PrintObjectStatus&>(print_object_status).status = PrintObjectStatus::Deleted;

+            }

+            if (model_object_status.print_object_regions_status == ModelObjectStatus::PrintObjectRegionsStatus::PartiallyValid)

+                // Drop everything from PrintObjectRegions but those VolumeExtents (of their particular ModelVolumes) that are still valid.

+                print_objects_regions_invalidate_keep_some_volumes(*model_object_status.print_object_regions, model_object.volumes, model_object_new.volumes);

+            else if (model_object_status.print_object_regions != nullptr)

+                model_object_status.print_object_regions->clear();

+            // Copy content of the ModelObject including its ID, do not change the parent.

+            model_object.assign_copy(model_object_new);

+        } else {

+            model_object_status.print_object_regions_status = ModelObjectStatus::PrintObjectRegionsStatus::Valid;

+            if (supports_differ || model_custom_supports_data_changed(model_object, model_object_new)) {

+                // First stop background processing before shuffling or deleting the ModelVolumes in the ModelObject's list.

+                if (supports_differ) {

+                    this->call_cancel_callback();

+                    update_apply_status(false);

+                }

+                // Invalidate just the supports step.

+                for (const PrintObjectStatus &print_object_status : print_objects_range)

+                    update_apply_status(print_object_status.print_object->invalidate_step(posSupportMaterial));

+                if (supports_differ) {

+                    // Copy just the support volumes.

+                    model_volume_list_update_supports(model_object, model_object_new);

+                }

+            } else if (model_custom_seam_data_changed(model_object, model_object_new)) {

+                update_apply_status(this->invalidate_step(psGCodeExport));

+            }

+        }

+        if (! solid_or_modifier_differ) {

+            // Synchronize Object's config.

+            bool object_config_changed = ! model_object.config.timestamp_matches(model_object_new.config);

+			if (object_config_changed)

+				model_object.config.assign_config(model_object_new.config);

+            if (! object_diff.empty() || object_config_changed || num_extruders_changed) {

+                PrintObjectConfig new_config = PrintObject::object_config_from_model_object(m_default_object_config, model_object, num_extruders);

+                for (const PrintObjectStatus &print_object_status : print_object_status_db.get_range(model_object)) {

+                    t_config_option_keys diff = print_object_status.print_object->config().diff(new_config);

+                    if (! diff.empty()) {

+                        update_apply_status(print_object_status.print_object->invalidate_state_by_config_options(print_object_status.print_object->config(), new_config, diff));

+                        print_object_status.print_object->config_apply_only(new_config, diff, true);

+                    }

+                }

+            }

+            // Synchronize (just copy) the remaining data of ModelVolumes (name, config, custom supports data).

+            //FIXME What to do with m_material_id?

+			model_volume_list_copy_configs(model_object /* dst */, model_object_new /* src */, ModelVolumeType::MODEL_PART);

+			model_volume_list_copy_configs(model_object /* dst */, model_object_new /* src */, ModelVolumeType::PARAMETER_MODIFIER);

+            layer_height_ranges_copy_configs(model_object.layer_config_ranges /* dst */, model_object_new.layer_config_ranges /* src */);

+            // Copy the ModelObject name, input_file and instances. The instances will be compared against PrintObject instances in the next step.

+            model_object.name       = model_object_new.name;

+            model_object.input_file = model_object_new.input_file;

+            // Only refresh ModelInstances if there is any change.

+            if (model_object.instances.size() != model_object_new.instances.size() || 

+            	! std::equal(model_object.instances.begin(), model_object.instances.end(), model_object_new.instances.begin(), [](auto l, auto r){ return l->id() == r->id(); })) {

+            	// G-code generator accesses model_object.instances to generate sequential print ordering matching the Plater object list.

+            	update_apply_status(this->invalidate_step(psGCodeExport));

+	            model_object.clear_instances();

+	            model_object.instances.reserve(model_object_new.instances.size());

+	            for (const ModelInstance *model_instance : model_object_new.instances) {

+	                model_object.instances.emplace_back(new ModelInstance(*model_instance));

+	                model_object.instances.back()->set_model_object(&model_object);

+	            }

+	        } else if (! std::equal(model_object.instances.begin(), model_object.instances.end(), model_object_new.instances.begin(), 

+	        		[](auto l, auto r){ return l->print_volume_state == r->print_volume_state && l->printable == r->printable && 

+	        						           l->get_transformation().get_matrix().isApprox(r->get_transformation().get_matrix()); })) {

+	        	// If some of the instances changed, the bounding box of the updated ModelObject is likely no more valid.

+	        	// This is safe as the ModelObject's bounding box is only accessed from this function, which is called from the main thread only.

+	 			model_object.invalidate_bounding_box();

+	        	// Synchronize the content of instances.

+	        	auto new_instance = model_object_new.instances.begin();

+				for (auto old_instance = model_object.instances.begin(); old_instance != model_object.instances.end(); ++ old_instance, ++ new_instance) {

+					(*old_instance)->set_transformation((*new_instance)->get_transformation());

+                    (*old_instance)->print_volume_state = (*new_instance)->print_volume_state;

+                    (*old_instance)->printable 		    = (*new_instance)->printable;

+  				}

+	        }

+        }

+    }

+

+    // 4) Generate PrintObjects from ModelObjects and their instances.

+    {

+        PrintObjectPtrs print_objects_new;

+        print_objects_new.reserve(std::max(m_objects.size(), m_model.objects.size()));

+        bool new_objects = false;

+        // Walk over all new model objects and check, whether there are matching PrintObjects.

+        for (ModelObject *model_object : m_model.objects) {

+            ModelObjectStatus &model_object_status = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(*model_object));

+            model_object_status.print_instances    = print_objects_from_model_object(*model_object);

+            std::vector<const PrintObjectStatus*> old;

+            old.reserve(print_object_status_db.count(*model_object));

+            for (const PrintObjectStatus &print_object_status : print_object_status_db.get_range(*model_object))

+                if (print_object_status.status != PrintObjectStatus::Deleted)

+                    old.emplace_back(&print_object_status);

+            // Generate a list of trafos and XY offsets for instances of a ModelObject

+            // Producing the config for PrintObject on demand, caching it at print_object_last.

+            const PrintObject *print_object_last = nullptr;

+            auto print_object_apply_config = [this, &print_object_last, model_object, num_extruders](PrintObject *print_object) {

+                print_object->config_apply(print_object_last ?

+                    print_object_last->config() :

+                    PrintObject::object_config_from_model_object(m_default_object_config, *model_object, num_extruders));

+                print_object_last = print_object;

+            };

+            if (old.empty()) {

+                // Simple case, just generate new instances.

+                for (PrintObjectTrafoAndInstances &print_instances : model_object_status.print_instances) {

+                    PrintObject *print_object = new PrintObject(this, model_object, print_instances.trafo, std::move(print_instances.instances));

+                    print_object_apply_config(print_object);

+                    print_objects_new.emplace_back(print_object);

+                    // print_object_status.emplace(PrintObjectStatus(print_object, PrintObjectStatus::New));

+                    new_objects = true;

+                }

+                continue;

+            }

+            // Complex case, try to merge the two lists.

+            // Sort the old lexicographically by their trafos.

+            std::sort(old.begin(), old.end(), [](const PrintObjectStatus *lhs, const PrintObjectStatus *rhs){ return transform3d_lower(lhs->trafo, rhs->trafo); });

+            // Merge the old / new lists.

+            auto it_old = old.begin();

+            for (PrintObjectTrafoAndInstances &new_instances : model_object_status.print_instances) {

+				for (; it_old != old.end() && transform3d_lower((*it_old)->trafo, new_instances.trafo); ++ it_old);

+				if (it_old == old.end() || ! transform3d_equal((*it_old)->trafo, new_instances.trafo)) {

+                    // This is a new instance (or a set of instances with the same trafo). Just add it.

+                    PrintObject *print_object = new PrintObject(this, model_object, new_instances.trafo, std::move(new_instances.instances));

+                    print_object_apply_config(print_object);

+                    print_objects_new.emplace_back(print_object);

+                    // print_object_status.emplace(PrintObjectStatus(print_object, PrintObjectStatus::New));

+                    new_objects = true;

+                    if (it_old != old.end())

+                        const_cast<PrintObjectStatus*>(*it_old)->status = PrintObjectStatus::Deleted;

+                } else {

+                    // The PrintObject already exists and the copies differ.

+					PrintBase::ApplyStatus status = (*it_old)->print_object->set_instances(std::move(new_instances.instances));

+                    if (status != PrintBase::APPLY_STATUS_UNCHANGED)

+						update_apply_status(status == PrintBase::APPLY_STATUS_INVALIDATED);

+					print_objects_new.emplace_back((*it_old)->print_object);

+					const_cast<PrintObjectStatus*>(*it_old)->status = PrintObjectStatus::Reused;

+				}

+            }

+        }

+        if (m_objects != print_objects_new) {

+            this->call_cancel_callback();

+			update_apply_status(this->invalidate_all_steps());

+            m_objects = print_objects_new;

+            // Delete the PrintObjects marked as Unknown or Deleted.

+            bool deleted_objects = false;

+            for (const PrintObjectStatus &pos : print_object_status_db)

+                if (pos.status == PrintObjectStatus::Unknown || pos.status == PrintObjectStatus::Deleted) {

+                    update_apply_status(pos.print_object->invalidate_all_steps());

+                    delete pos.print_object;

+					deleted_objects = true;

+                }

+			if (new_objects || deleted_objects)

+                update_apply_status(this->invalidate_steps({ psSkirtBrim, psWipeTower, psGCodeExport }));

+			if (new_objects)

+	            update_apply_status(false);

+            print_regions_reshuffled = true;

+        }

+        print_object_status_db.clear();

+    }

+

+    // All regions now have distinct settings.

+    // Check whether applying the new region config defaults we would get different regions,

+    // update regions or create regions from scratch.

+    for (auto it_print_object = m_objects.begin(); it_print_object != m_objects.end();) {

+        // Find the range of PrintObjects sharing the same associated ModelObject.

+        auto                it_print_object_end  = it_print_object;

+        PrintObject        &print_object         = *(*it_print_object);

+        const ModelObject  &model_object         = *print_object.model_object();

+        ModelObjectStatus  &model_object_status  = const_cast<ModelObjectStatus&>(model_object_status_db.reuse(model_object));

+        PrintObjectRegions *print_object_regions = model_object_status.print_object_regions;

+        for (++ it_print_object_end; it_print_object_end != m_objects.end() && (*it_print_object)->model_object() == (*it_print_object_end)->model_object(); ++ it_print_object_end)

+            assert((*it_print_object_end)->m_shared_regions == nullptr || (*it_print_object_end)->m_shared_regions == print_object_regions);

+        if (print_object_regions == nullptr) {

+            print_object_regions = new PrintObjectRegions{};

+            model_object_status.print_object_regions = print_object_regions;

+            print_object_regions->ref_cnt_inc();

+        }

+        std::vector<unsigned int> painting_extruders;

+        if (const auto &volumes = print_object.model_object()->volumes;

+            num_extruders > 1 &&

+            std::find_if(volumes.begin(), volumes.end(), [](const ModelVolume *v) { return ! v->mmu_segmentation_facets.empty(); }) != volumes.end()) {

+            //FIXME be more specific! Don't enumerate extruders that are not used for painting!

+            painting_extruders.assign(num_extruders, 0);

+            std::iota(painting_extruders.begin(), painting_extruders.end(), 1);

+        }

+        if (model_object_status.print_object_regions_status == ModelObjectStatus::PrintObjectRegionsStatus::Valid) {

+            // Verify that the trafo for regions & volume bounding boxes thus for regions is still applicable.

+            auto invalidate = [it_print_object, it_print_object_end, update_apply_status]() {

+                for (auto it = it_print_object; it != it_print_object_end; ++ it)

+                    if ((*it)->m_shared_regions != nullptr)

+                        update_apply_status((*it)->invalidate_all_steps());

+            };

+            if (print_object_regions && ! trafos_differ_in_rotation_by_z_and_mirroring_by_xy_only(print_object_regions->trafo_bboxes, model_object_status.print_instances.front().trafo)) {

+                invalidate();

+                print_object_regions->clear();

+                model_object_status.print_object_regions_status = ModelObjectStatus::PrintObjectRegionsStatus::Invalid;

+                print_regions_reshuffled = true;

+            } else if (print_object_regions &&

+                verify_update_print_object_regions(

+                    print_object.model_object()->volumes,

+                    m_default_region_config,

+                    num_extruders,

+                    painting_extruders,

+                    *print_object_regions,

+                    [it_print_object, it_print_object_end, &update_apply_status](const PrintRegionConfig &old_config, const PrintRegionConfig &new_config, const t_config_option_keys &diff_keys) {

+                        for (auto it = it_print_object; it != it_print_object_end; ++it)

+                            if ((*it)->m_shared_regions != nullptr)

+                                update_apply_status((*it)->invalidate_state_by_config_options(old_config, new_config, diff_keys));

+                    })) {

+                // Regions are valid, just keep them.

+            } else {

+                // Regions were reshuffled.

+                invalidate();

+                // At least reuse layer ranges and bounding boxes of ModelVolumes.

+                model_object_status.print_object_regions_status = ModelObjectStatus::PrintObjectRegionsStatus::PartiallyValid;

+                print_regions_reshuffled = true;

+            }

+        }

+        if (print_object_regions == nullptr || model_object_status.print_object_regions_status != ModelObjectStatus::PrintObjectRegionsStatus::Valid) {

+            // Layer ranges with their associated configurations. Remove overlaps between the ranges

+            // and create the regions from scratch.

+            print_object_regions = generate_print_object_regions(

+                print_object_regions,

+                print_object.model_object()->volumes,

+                LayerRanges(print_object.model_object()->layer_config_ranges),

+                m_default_region_config,

+                model_object_status.print_instances.front().trafo,

+                num_extruders,

+                print_object.is_mm_painted() ? 0.f : float(print_object.config().xy_size_compensation.value),

+                painting_extruders);

+        }

+        for (auto it = it_print_object; it != it_print_object_end; ++it)

+            if ((*it)->m_shared_regions) {

+                assert((*it)->m_shared_regions == print_object_regions);

+            } else {

+                (*it)->m_shared_regions = print_object_regions;

+                print_object_regions->ref_cnt_inc();

+            }

+        it_print_object = it_print_object_end;

+    }

+

+    if (print_regions_reshuffled) {

+        // Update Print::m_print_regions from objects.

+        struct cmp { bool operator() (const PrintRegion *l, const PrintRegion *r) const { return l->config_hash() == r->config_hash() && l->config() == r->config(); } };

+        std::set<const PrintRegion*, cmp> region_set;

+        m_print_regions.clear();

+        PrintObjectRegions *print_object_regions = nullptr;

+        for (PrintObject *print_object : m_objects)

+            if (print_object_regions != print_object->m_shared_regions) {

+                print_object_regions = print_object->m_shared_regions;

+                for (std::unique_ptr<Slic3r::PrintRegion> &print_region : print_object_regions->all_regions)

+                    if (auto it = region_set.find(print_region.get()); it == region_set.end()) {

+                        int print_region_id = int(m_print_regions.size());

+                        m_print_regions.emplace_back(print_region.get());

+                        print_region->m_print_region_id = print_region_id;

+                    } else {

+                        print_region->m_print_region_id = (*it)->print_region_id();

+                    }

+            }

+    }

+

+    // Update SlicingParameters for each object where the SlicingParameters is not valid.

+    // If it is not valid, then it is ensured that PrintObject.m_slicing_params is not in use

+    // (posSlicing and posSupportMaterial was invalidated).

+    for (PrintObject *object : m_objects)

+        object->update_slicing_parameters();

+

+#ifdef _DEBUG

+    check_model_ids_equal(m_model, model);

+#endif /* _DEBUG */

+

+	return static_cast<ApplyStatus>(apply_status);

+}

+

+} // namespace Slic3r

diff --git a/src/libslic3r/Technologies.hpp b/src/libslic3r/Technologies.hpp
index 6a73aaf1e..c44b914b4 100644
--- a/src/libslic3r/Technologies.hpp
+++ b/src/libslic3r/Technologies.hpp
@@ -79,6 +79,8 @@
 #define ENABLE_WORLD_COORDINATE_SHOW_AXES (1 && ENABLE_WORLD_COORDINATE)

 // Enable alternate implementation of manipulating scale for instances and volumes

 #define ENABLE_WORLD_COORDINATE_SCALE_REVISITED (1 && ENABLE_WORLD_COORDINATE)

+// Enable implementation of Geometry::Transformation using matrices only

+#define ENABLE_TRANSFORMATIONS_BY_MATRICES (1 && ENABLE_WORLD_COORDINATE)

 // Enable modified camera control using mouse

 #define ENABLE_NEW_CAMERA_MOVEMENTS (1 && ENABLE_2_5_0_ALPHA1)

 // Enable modified rectangle selection

diff --git a/src/slic3r/GUI/3DScene.hpp b/src/slic3r/GUI/3DScene.hpp
index a85b8092a..263d8af08 100644
--- a/src/slic3r/GUI/3DScene.hpp
+++ b/src/slic3r/GUI/3DScene.hpp
@@ -1,783 +1,811 @@
-#ifndef slic3r_3DScene_hpp_
-#define slic3r_3DScene_hpp_
-
-#include "libslic3r/libslic3r.h"
-#include "libslic3r/Point.hpp"
-#include "libslic3r/Line.hpp"
-#include "libslic3r/TriangleMesh.hpp"
-#include "libslic3r/Utils.hpp"
-#include "libslic3r/Geometry.hpp"
-#include "libslic3r/Color.hpp"
-
-#include "GLModel.hpp"
-
-#include <functional>
-#include <optional>
-
-#ifndef NDEBUG
-#define HAS_GLSAFE
-#endif // NDEBUG
-
-#ifdef HAS_GLSAFE
-    extern void glAssertRecentCallImpl(const char *file_name, unsigned int line, const char *function_name);
-    inline void glAssertRecentCall() { glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); }
-    #define glsafe(cmd) do { cmd; glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); } while (false)
-    #define glcheck() do { glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); } while (false)
-#else // HAS_GLSAFE
-    inline void glAssertRecentCall() { }
-    #define glsafe(cmd) cmd
-    #define glcheck()
-#endif // HAS_GLSAFE
-
-namespace Slic3r {
-class SLAPrintObject;
-enum  SLAPrintObjectStep : unsigned int;
-class BuildVolume;
-class DynamicPrintConfig;
-class ExtrusionPath;
-class ExtrusionMultiPath;
-class ExtrusionLoop;
-class ExtrusionEntity;
-class ExtrusionEntityCollection;
-class ModelObject;
-class ModelVolume;
-enum ModelInstanceEPrintVolumeState : unsigned char;
-
-// Return appropriate color based on the ModelVolume.
-extern ColorRGBA color_from_model_volume(const ModelVolume& model_volume);
-
-#if !ENABLE_LEGACY_OPENGL_REMOVAL
-// A container for interleaved arrays of 3D vertices and normals,
-// possibly indexed by triangles and / or quads.
-class GLIndexedVertexArray {
-public:
-    // Only Eigen types of Nx16 size are vectorized. This bounding box will not be vectorized.
-    static_assert(sizeof(Eigen::AlignedBox<float, 3>) == 24, "Eigen::AlignedBox<float, 3> is not being vectorized, thus it does not need to be aligned");
-    using BoundingBox = Eigen::AlignedBox<float, 3>;
-
-    GLIndexedVertexArray() { m_bounding_box.setEmpty(); }
-    GLIndexedVertexArray(const GLIndexedVertexArray &rhs) :
-        vertices_and_normals_interleaved(rhs.vertices_and_normals_interleaved),
-        triangle_indices(rhs.triangle_indices),
-        quad_indices(rhs.quad_indices),
-        m_bounding_box(rhs.m_bounding_box)
-        { assert(! rhs.has_VBOs()); m_bounding_box.setEmpty(); }
-    GLIndexedVertexArray(GLIndexedVertexArray &&rhs) :
-        vertices_and_normals_interleaved(std::move(rhs.vertices_and_normals_interleaved)),
-        triangle_indices(std::move(rhs.triangle_indices)),
-        quad_indices(std::move(rhs.quad_indices)),
-        m_bounding_box(rhs.m_bounding_box)
-        { assert(! rhs.has_VBOs()); }
-
-    ~GLIndexedVertexArray() { release_geometry(); }
-
-    GLIndexedVertexArray& operator=(const GLIndexedVertexArray &rhs)
-    {
-        assert(vertices_and_normals_interleaved_VBO_id == 0);
-        assert(triangle_indices_VBO_id == 0);
-        assert(quad_indices_VBO_id == 0);
-        assert(rhs.vertices_and_normals_interleaved_VBO_id == 0);
-        assert(rhs.triangle_indices_VBO_id == 0);
-        assert(rhs.quad_indices_VBO_id == 0);
-        this->vertices_and_normals_interleaved 		 = rhs.vertices_and_normals_interleaved;
-        this->triangle_indices                 		 = rhs.triangle_indices;
-        this->quad_indices                     		 = rhs.quad_indices;
-        this->m_bounding_box                   		 = rhs.m_bounding_box;
-        this->vertices_and_normals_interleaved_size  = rhs.vertices_and_normals_interleaved_size;
-        this->triangle_indices_size                  = rhs.triangle_indices_size;
-        this->quad_indices_size                      = rhs.quad_indices_size;
-        return *this;
-    }
-
-    GLIndexedVertexArray& operator=(GLIndexedVertexArray &&rhs) 
-    {
-        assert(vertices_and_normals_interleaved_VBO_id == 0);
-        assert(triangle_indices_VBO_id == 0);
-        assert(quad_indices_VBO_id == 0);
-        assert(rhs.vertices_and_normals_interleaved_VBO_id == 0);
-        assert(rhs.triangle_indices_VBO_id == 0);
-        assert(rhs.quad_indices_VBO_id == 0);
-        this->vertices_and_normals_interleaved 		 = std::move(rhs.vertices_and_normals_interleaved);
-        this->triangle_indices                 		 = std::move(rhs.triangle_indices);
-        this->quad_indices                     		 = std::move(rhs.quad_indices);
-        this->m_bounding_box                   		 = rhs.m_bounding_box;
-        this->vertices_and_normals_interleaved_size  = rhs.vertices_and_normals_interleaved_size;
-        this->triangle_indices_size                  = rhs.triangle_indices_size;
-        this->quad_indices_size                      = rhs.quad_indices_size;
-        return *this;
-    }
-
-    // Vertices and their normals, interleaved to be used by void glInterleavedArrays(GL_N3F_V3F, 0, x)
-    std::vector<float> vertices_and_normals_interleaved;
-    std::vector<int>   triangle_indices;
-    std::vector<int>   quad_indices;
-
-    // When the geometry data is loaded into the graphics card as Vertex Buffer Objects,
-    // the above mentioned std::vectors are cleared and the following variables keep their original length.
-    size_t vertices_and_normals_interleaved_size{ 0 };
-    size_t triangle_indices_size{ 0 };
-    size_t quad_indices_size{ 0 };
-
-    // IDs of the Vertex Array Objects, into which the geometry has been loaded.
-    // Zero if the VBOs are not sent to GPU yet.
-    unsigned int       vertices_and_normals_interleaved_VBO_id{ 0 };
-    unsigned int       triangle_indices_VBO_id{ 0 };
-    unsigned int       quad_indices_VBO_id{ 0 };
-
-#if ENABLE_SMOOTH_NORMALS
-    void load_mesh_full_shading(const TriangleMesh& mesh, bool smooth_normals = false);
-    void load_mesh(const TriangleMesh& mesh, bool smooth_normals = false) { this->load_mesh_full_shading(mesh, smooth_normals); }
-#else
-    void load_mesh_full_shading(const TriangleMesh& mesh);
-    void load_mesh(const TriangleMesh& mesh) { this->load_mesh_full_shading(mesh); }
-#endif // ENABLE_SMOOTH_NORMALS
-
-    void load_its_flat_shading(const indexed_triangle_set &its);
-
-    inline bool has_VBOs() const { return vertices_and_normals_interleaved_VBO_id != 0; }
-
-    inline void reserve(size_t sz) {
-        this->vertices_and_normals_interleaved.reserve(sz * 6);
-        this->triangle_indices.reserve(sz * 3);
-        this->quad_indices.reserve(sz * 4);
-    }
-
-    inline void push_geometry(float x, float y, float z, float nx, float ny, float nz) {
-        assert(this->vertices_and_normals_interleaved_VBO_id == 0);
-        if (this->vertices_and_normals_interleaved_VBO_id != 0)
-            return;
-
-        if (this->vertices_and_normals_interleaved.size() + 6 > this->vertices_and_normals_interleaved.capacity())
-            this->vertices_and_normals_interleaved.reserve(next_highest_power_of_2(this->vertices_and_normals_interleaved.size() + 6));
-        this->vertices_and_normals_interleaved.emplace_back(nx);
-        this->vertices_and_normals_interleaved.emplace_back(ny);
-        this->vertices_and_normals_interleaved.emplace_back(nz);
-        this->vertices_and_normals_interleaved.emplace_back(x);
-        this->vertices_and_normals_interleaved.emplace_back(y);
-        this->vertices_and_normals_interleaved.emplace_back(z);
-
-        this->vertices_and_normals_interleaved_size = this->vertices_and_normals_interleaved.size();
-        m_bounding_box.extend(Vec3f(x, y, z));
-    };
-
-    inline void push_geometry(double x, double y, double z, double nx, double ny, double nz) {
-        push_geometry(float(x), float(y), float(z), float(nx), float(ny), float(nz));
-    }
-
-    template<typename Derived, typename Derived2>
-    inline void push_geometry(const Eigen::MatrixBase<Derived>& p, const Eigen::MatrixBase<Derived2>& n) {
-        push_geometry(float(p(0)), float(p(1)), float(p(2)), float(n(0)), float(n(1)), float(n(2)));
-    }
-
-    inline void push_triangle(int idx1, int idx2, int idx3) {
-        assert(this->vertices_and_normals_interleaved_VBO_id == 0);
-        if (this->vertices_and_normals_interleaved_VBO_id != 0)
-            return;
-
-        if (this->triangle_indices.size() + 3 > this->vertices_and_normals_interleaved.capacity())
-            this->triangle_indices.reserve(next_highest_power_of_2(this->triangle_indices.size() + 3));
-        this->triangle_indices.emplace_back(idx1);
-        this->triangle_indices.emplace_back(idx2);
-        this->triangle_indices.emplace_back(idx3);
-        this->triangle_indices_size = this->triangle_indices.size();
-    };
-
-    inline void push_quad(int idx1, int idx2, int idx3, int idx4) {
-        assert(this->vertices_and_normals_interleaved_VBO_id == 0);
-        if (this->vertices_and_normals_interleaved_VBO_id != 0)
-            return;
-
-        if (this->quad_indices.size() + 4 > this->vertices_and_normals_interleaved.capacity())
-            this->quad_indices.reserve(next_highest_power_of_2(this->quad_indices.size() + 4));
-        this->quad_indices.emplace_back(idx1);
-        this->quad_indices.emplace_back(idx2);
-        this->quad_indices.emplace_back(idx3);
-        this->quad_indices.emplace_back(idx4);
-        this->quad_indices_size = this->quad_indices.size();
-    };
-
-    // Finalize the initialization of the geometry & indices,
-    // upload the geometry and indices to OpenGL VBO objects
-    // and shrink the allocated data, possibly relasing it if it has been loaded into the VBOs.
-    void finalize_geometry(bool opengl_initialized);
-    // Release the geometry data, release OpenGL VBOs.
-    void release_geometry();
-
-    void render() const;
-    void render(const std::pair<size_t, size_t>& tverts_range, const std::pair<size_t, size_t>& qverts_range) const;
-
-    // Is there any geometry data stored?
-    bool empty() const { return vertices_and_normals_interleaved_size == 0; }
-
-    void clear() {
-        this->vertices_and_normals_interleaved.clear();
-        this->triangle_indices.clear();
-        this->quad_indices.clear();
-        vertices_and_normals_interleaved_size = 0;
-        triangle_indices_size = 0;
-        quad_indices_size = 0;
-        m_bounding_box.setEmpty();
-    }
-
-    // Shrink the internal storage to tighly fit the data stored.
-    void shrink_to_fit() {
-        this->vertices_and_normals_interleaved.shrink_to_fit();
-        this->triangle_indices.shrink_to_fit();
-        this->quad_indices.shrink_to_fit();
-    }
-
-    const BoundingBox& bounding_box() const { return m_bounding_box; }
-
-    // Return an estimate of the memory consumed by this class.
-    size_t cpu_memory_used() const { return sizeof(*this) + vertices_and_normals_interleaved.capacity() * sizeof(float) + triangle_indices.capacity() * sizeof(int) + quad_indices.capacity() * sizeof(int); }
-    // Return an estimate of the memory held by GPU vertex buffers.
-    size_t gpu_memory_used() const
-    {
-    	size_t memsize = 0;
-    	if (this->vertices_and_normals_interleaved_VBO_id != 0)
-    		memsize += this->vertices_and_normals_interleaved_size * 4;
-    	if (this->triangle_indices_VBO_id != 0)
-    		memsize += this->triangle_indices_size * 4;
-    	if (this->quad_indices_VBO_id != 0)
-    		memsize += this->quad_indices_size * 4;
-    	return memsize;
-    }
-    size_t total_memory_used() const { return this->cpu_memory_used() + this->gpu_memory_used(); }
-
-private:
-    BoundingBox m_bounding_box;
-};
-#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
-
-class GLVolume {
-public:
-    static const ColorRGBA SELECTED_COLOR;
-    static const ColorRGBA HOVER_SELECT_COLOR;
-    static const ColorRGBA HOVER_DESELECT_COLOR;
-    static const ColorRGBA OUTSIDE_COLOR;
-    static const ColorRGBA SELECTED_OUTSIDE_COLOR;
-    static const ColorRGBA DISABLED_COLOR;
-    static const ColorRGBA SLA_SUPPORT_COLOR;
-    static const ColorRGBA SLA_PAD_COLOR;
-    static const ColorRGBA NEUTRAL_COLOR;
-    static const std::array<ColorRGBA, 4> MODEL_COLOR;
-
-    enum EHoverState : unsigned char
-    {
-        HS_None,
-        HS_Hover,
-        HS_Select,
-        HS_Deselect
-    };
-
-    GLVolume(float r = 1.0f, float g = 1.0f, float b = 1.0f, float a = 1.0f);
-    GLVolume(const ColorRGBA& color) : GLVolume(color.r(), color.g(), color.b(), color.a()) {}
-
-private:
-    Geometry::Transformation m_instance_transformation;
-    Geometry::Transformation m_volume_transformation;
-
-    // Shift in z required by sla supports+pad
-    double        m_sla_shift_z;
-    // Bounding box of this volume, in unscaled coordinates.
-    std::optional<BoundingBoxf3> m_transformed_bounding_box;
-    // Convex hull of the volume, if any.
-    std::shared_ptr<const TriangleMesh> m_convex_hull;
-    // Bounding box of this volume, in unscaled coordinates.
-    std::optional<BoundingBoxf3> m_transformed_convex_hull_bounding_box;
-    // Bounding box of the non sinking part of this volume, in unscaled coordinates.
-    std::optional<BoundingBoxf3> m_transformed_non_sinking_bounding_box;
-
-    class SinkingContours
-    {
-        static const float HalfWidth;
-        GLVolume& m_parent;
-        GUI::GLModel m_model;
-        BoundingBoxf3 m_old_box;
-        Vec3d m_shift{ Vec3d::Zero() };
-
-    public:
-        SinkingContours(GLVolume& volume) : m_parent(volume) {}
-        void render();
-
-    private:
-        void update();
-    };
-
-    SinkingContours m_sinking_contours;
-
-#if ENABLE_SHOW_NON_MANIFOLD_EDGES
-    class NonManifoldEdges
-    {
-        GLVolume& m_parent;
-        GUI::GLModel m_model;
-        bool m_update_needed{ true };
-
-    public:
-        NonManifoldEdges(GLVolume& volume) : m_parent(volume) {}
-        void render();
-        void set_as_dirty() { m_update_needed = true; }
-
-    private:
-        void update();
-    };
-
-    NonManifoldEdges m_non_manifold_edges;
-#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES
-
-public:
-    // Color of the triangles / quads held by this volume.
-    ColorRGBA color;
-    // Color used to render this volume.
-    ColorRGBA render_color;
-
-    struct CompositeID {
-        CompositeID(int object_id, int volume_id, int instance_id) : object_id(object_id), volume_id(volume_id), instance_id(instance_id) {}
-        CompositeID() : object_id(-1), volume_id(-1), instance_id(-1) {}
-        // Object ID, which is equal to the index of the respective ModelObject in Model.objects array.
-        int             object_id;
-        // Volume ID, which is equal to the index of the respective ModelVolume in ModelObject.volumes array.
-        // If negative, it is an index of a geometry produced by the PrintObject for the respective ModelObject,
-        // and which has no associated ModelVolume in ModelObject.volumes. For example, SLA supports.
-        // Volume with a negative volume_id cannot be picked independently, it will pick the associated instance.
-        int             volume_id;
-        // Instance ID, which is equal to the index of the respective ModelInstance in ModelObject.instances array.
-        int             instance_id;
-		bool operator==(const CompositeID &rhs) const { return object_id == rhs.object_id && volume_id == rhs.volume_id && instance_id == rhs.instance_id; }
-		bool operator!=(const CompositeID &rhs) const { return ! (*this == rhs); }
-		bool operator< (const CompositeID &rhs) const 
-			{ return object_id < rhs.object_id || (object_id == rhs.object_id && (volume_id < rhs.volume_id || (volume_id == rhs.volume_id && instance_id < rhs.instance_id))); }
-    };
-    CompositeID         composite_id;
-    // Fingerprint of the source geometry. For ModelVolumes, it is the ModelVolume::ID and ModelInstanceID, 
-    // for generated volumes it is the timestamp generated by PrintState::invalidate() or PrintState::set_done(),
-    // and the associated ModelInstanceID.
-    // Valid geometry_id should always be positive.
-    std::pair<size_t, size_t> geometry_id;
-    // An ID containing the extruder ID (used to select color).
-    int                 	extruder_id;
-
-    // Various boolean flags.
-    struct {
-	    // Is this object selected?
-	    bool                selected : 1;
-	    // Is this object disabled from selection?
-	    bool                disabled : 1;
-	    // Is this object printable?
-	    bool                printable : 1;
-	    // Whether or not this volume is active for rendering
-	    bool                is_active : 1;
-	    // Whether or not to use this volume when applying zoom_to_volumes()
-	    bool                zoom_to_volumes : 1;
-	    // Wheter or not this volume is enabled for outside print volume detection in shader.
-	    bool                shader_outside_printer_detection_enabled : 1;
-	    // Wheter or not this volume is outside print volume.
-	    bool                is_outside : 1;
-	    // Wheter or not this volume has been generated from a modifier
-	    bool                is_modifier : 1;
-	    // Wheter or not this volume has been generated from the wipe tower
-	    bool                is_wipe_tower : 1;
-	    // Wheter or not this volume has been generated from an extrusion path
-	    bool                is_extrusion_path : 1;
-        // Whether or not always use the volume's own color (not using SELECTED/HOVER/DISABLED/OUTSIDE)
-	    bool                force_native_color : 1;
-        // Whether or not render this volume in neutral
-        bool                force_neutral_color : 1;
-        // Whether or not to force rendering of sinking contours
-        bool                force_sinking_contours : 1;
-    };
-
-    // Is mouse or rectangle selection over this object to select/deselect it ?
-    EHoverState         	hover;
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GUI::GLModel            model;
-#else
-    // Interleaved triangles & normals with indexed triangles & quads.
-    GLIndexedVertexArray        indexed_vertex_array;
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    // Ranges of triangle and quad indices to be rendered.
-    std::pair<size_t, size_t>   tverts_range;
-#if !ENABLE_LEGACY_OPENGL_REMOVAL
-    std::pair<size_t, size_t>   qverts_range;
-#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
-
-    // If the qverts or tverts contain thick extrusions, then offsets keeps pointers of the starts
-    // of the extrusions per layer.
-    std::vector<coordf_t>       print_zs;
-    // Offset into qverts & tverts, or offsets into indices stored into an OpenGL name_index_buffer.
-    std::vector<size_t>         offsets;
-
-    // Bounding box of this volume, in unscaled coordinates.
-    BoundingBoxf3 bounding_box() const { 
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        return this->model.get_bounding_box();
-#else
-        BoundingBoxf3 out;
-        if (!this->indexed_vertex_array.bounding_box().isEmpty()) {
-            out.min = this->indexed_vertex_array.bounding_box().min().cast<double>();
-            out.max = this->indexed_vertex_array.bounding_box().max().cast<double>();
-            out.defined = true;
-        }
-        return out;
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    }
-
-    void set_color(const ColorRGBA& rgba)        { color = rgba; }
-    void set_render_color(const ColorRGBA& rgba) { render_color = rgba; }
-    // Sets render color in dependence of current state
-    void set_render_color(bool force_transparent);
-    // set color according to model volume
-    void set_color_from_model_volume(const ModelVolume& model_volume);
-
-    const Geometry::Transformation& get_instance_transformation() const { return m_instance_transformation; }
-    void set_instance_transformation(const Geometry::Transformation& transformation) { m_instance_transformation = transformation; set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_instance_offset() const { return m_instance_transformation.get_offset(); }
-    double get_instance_offset(Axis axis) const { return m_instance_transformation.get_offset(axis); }
-
-    void set_instance_offset(const Vec3d& offset) { m_instance_transformation.set_offset(offset); set_bounding_boxes_as_dirty(); }
-    void set_instance_offset(Axis axis, double offset) { m_instance_transformation.set_offset(axis, offset); set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_instance_rotation() const { return m_instance_transformation.get_rotation(); }
-    double get_instance_rotation(Axis axis) const { return m_instance_transformation.get_rotation(axis); }
-
-    void set_instance_rotation(const Vec3d& rotation) { m_instance_transformation.set_rotation(rotation); set_bounding_boxes_as_dirty(); }
-    void set_instance_rotation(Axis axis, double rotation) { m_instance_transformation.set_rotation(axis, rotation); set_bounding_boxes_as_dirty(); }
-
-    Vec3d get_instance_scaling_factor() const { return m_instance_transformation.get_scaling_factor(); }
-    double get_instance_scaling_factor(Axis axis) const { return m_instance_transformation.get_scaling_factor(axis); }
-
-    void set_instance_scaling_factor(const Vec3d& scaling_factor) { m_instance_transformation.set_scaling_factor(scaling_factor); set_bounding_boxes_as_dirty(); }
-    void set_instance_scaling_factor(Axis axis, double scaling_factor) { m_instance_transformation.set_scaling_factor(axis, scaling_factor); set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_instance_mirror() const { return m_instance_transformation.get_mirror(); }
-    double get_instance_mirror(Axis axis) const { return m_instance_transformation.get_mirror(axis); }
-
-    void set_instance_mirror(const Vec3d& mirror) { m_instance_transformation.set_mirror(mirror); set_bounding_boxes_as_dirty(); }
-    void set_instance_mirror(Axis axis, double mirror) { m_instance_transformation.set_mirror(axis, mirror); set_bounding_boxes_as_dirty(); }
-
-    const Geometry::Transformation& get_volume_transformation() const { return m_volume_transformation; }
-    void set_volume_transformation(const Geometry::Transformation& transformation) { m_volume_transformation = transformation; set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_volume_offset() const { return m_volume_transformation.get_offset(); }
-    double get_volume_offset(Axis axis) const { return m_volume_transformation.get_offset(axis); }
-
-    void set_volume_offset(const Vec3d& offset) { m_volume_transformation.set_offset(offset); set_bounding_boxes_as_dirty(); }
-    void set_volume_offset(Axis axis, double offset) { m_volume_transformation.set_offset(axis, offset); set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_volume_rotation() const { return m_volume_transformation.get_rotation(); }
-    double get_volume_rotation(Axis axis) const { return m_volume_transformation.get_rotation(axis); }
-
-    void set_volume_rotation(const Vec3d& rotation) { m_volume_transformation.set_rotation(rotation); set_bounding_boxes_as_dirty(); }
-    void set_volume_rotation(Axis axis, double rotation) { m_volume_transformation.set_rotation(axis, rotation); set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_volume_scaling_factor() const { return m_volume_transformation.get_scaling_factor(); }
-    double get_volume_scaling_factor(Axis axis) const { return m_volume_transformation.get_scaling_factor(axis); }
-
-    void set_volume_scaling_factor(const Vec3d& scaling_factor) { m_volume_transformation.set_scaling_factor(scaling_factor); set_bounding_boxes_as_dirty(); }
-    void set_volume_scaling_factor(Axis axis, double scaling_factor) { m_volume_transformation.set_scaling_factor(axis, scaling_factor); set_bounding_boxes_as_dirty(); }
-
-    const Vec3d& get_volume_mirror() const { return m_volume_transformation.get_mirror(); }
-    double get_volume_mirror(Axis axis) const { return m_volume_transformation.get_mirror(axis); }
-
-    void set_volume_mirror(const Vec3d& mirror) { m_volume_transformation.set_mirror(mirror); set_bounding_boxes_as_dirty(); }
-    void set_volume_mirror(Axis axis, double mirror) { m_volume_transformation.set_mirror(axis, mirror); set_bounding_boxes_as_dirty(); }
-     
-    double get_sla_shift_z() const { return m_sla_shift_z; }
-    void set_sla_shift_z(double z) { m_sla_shift_z = z; }
-
-    void set_convex_hull(std::shared_ptr<const TriangleMesh> convex_hull) { m_convex_hull = std::move(convex_hull); }
-    void set_convex_hull(const TriangleMesh &convex_hull) { m_convex_hull = std::make_shared<const TriangleMesh>(convex_hull); }
-    void set_convex_hull(TriangleMesh &&convex_hull) { m_convex_hull = std::make_shared<const TriangleMesh>(std::move(convex_hull)); }
-
-    int                 object_idx() const   { return this->composite_id.object_id; }
-    int                 volume_idx() const   { return this->composite_id.volume_id; }
-    int                 instance_idx() const { return this->composite_id.instance_id; }
-
-    Transform3d         world_matrix() const;
-    bool                is_left_handed() const;
-
-    const BoundingBoxf3& transformed_bounding_box() const;
-    // non-caching variant
-    BoundingBoxf3        transformed_convex_hull_bounding_box(const Transform3d &trafo) const;
-    // caching variant
-    const BoundingBoxf3& transformed_convex_hull_bounding_box() const;
-    // non-caching variant
-    BoundingBoxf3        transformed_non_sinking_bounding_box(const Transform3d& trafo) const;
-    // caching variant
-    const BoundingBoxf3& transformed_non_sinking_bounding_box() const;
-    // convex hull
-    const TriangleMesh*  convex_hull() const { return m_convex_hull.get(); }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    bool                empty() const { return this->model.is_empty(); }
-#else
-    bool                empty() const { return this->indexed_vertex_array.empty(); }
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    void                set_range(double low, double high);
-
-    void                render();
-
-#if !ENABLE_LEGACY_OPENGL_REMOVAL
-    void                finalize_geometry(bool opengl_initialized) { this->indexed_vertex_array.finalize_geometry(opengl_initialized); }
-    void                release_geometry() { this->indexed_vertex_array.release_geometry(); }
-#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
-
-    void                set_bounding_boxes_as_dirty() {
-        m_transformed_bounding_box.reset();
-        m_transformed_convex_hull_bounding_box.reset();
-        m_transformed_non_sinking_bounding_box.reset();
-    }
-
-    bool                is_sla_support() const;
-    bool                is_sla_pad() const;
-
-    bool                is_sinking() const;
-    bool                is_below_printbed() const;
-    void                render_sinking_contours();
-#if ENABLE_SHOW_NON_MANIFOLD_EDGES
-    void                render_non_manifold_edges();
-#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES
-
-    // Return an estimate of the memory consumed by this class.
-    size_t 				cpu_memory_used() const {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        return sizeof(*this) + this->model.cpu_memory_used() + this->print_zs.capacity() * sizeof(coordf_t) +
-               this->offsets.capacity() * sizeof(size_t);
-    }
-    // Return an estimate of the memory held by GPU vertex buffers.
-    size_t 				gpu_memory_used() const { return this->model.gpu_memory_used(); }
-#else
-        //FIXME what to do wih m_convex_hull?
-    	return sizeof(*this) - sizeof(this->indexed_vertex_array) + this->indexed_vertex_array.cpu_memory_used() + this->print_zs.capacity() * sizeof(coordf_t) + this->offsets.capacity() * sizeof(size_t);
-    }
-    // Return an estimate of the memory held by GPU vertex buffers.
-    size_t 				gpu_memory_used() const { return this->indexed_vertex_array.gpu_memory_used(); }
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    size_t 				total_memory_used() const { return this->cpu_memory_used() + this->gpu_memory_used(); }
-};
-
-typedef std::vector<GLVolume*> GLVolumePtrs;
-typedef std::pair<GLVolume*, std::pair<unsigned int, double>> GLVolumeWithIdAndZ;
-typedef std::vector<GLVolumeWithIdAndZ> GLVolumeWithIdAndZList;
-
-class GLVolumeCollection
-{
-public:
-    enum class ERenderType : unsigned char
-    {
-        Opaque,
-        Transparent,
-        All
-    };
-
-    struct PrintVolume
-    {
-        // see: Bed3D::EShapeType
-        int type{ 0 };
-        // data contains:
-        // Rectangle:
-        //   [0] = min.x, [1] = min.y, [2] = max.x, [3] = max.y
-        // Circle:
-        //   [0] = center.x, [1] = center.y, [3] = radius
-        std::array<float, 4> data;
-        //   [0] = min z, [1] = max z
-        std::array<float, 2> zs;
-    };
-
-private:
-    PrintVolume m_print_volume;
-
-    // z range for clipping in shaders
-    std::array<float, 2> m_z_range;
-
-    // plane coeffs for clipping in shaders
-    std::array<double, 4> m_clipping_plane;
-
-    struct Slope
-    {
-        // toggle for slope rendering 
-        bool active{ false };
-        float normal_z;
-    };
-
-    Slope m_slope;
-    bool m_show_sinking_contours{ false };
-#if ENABLE_SHOW_NON_MANIFOLD_EDGES
-    bool m_show_non_manifold_edges{ true };
-#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES
-
-public:
-    GLVolumePtrs volumes;
-
-    GLVolumeCollection() { set_default_slope_normal_z(); }
-    ~GLVolumeCollection() { clear(); }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    std::vector<int> load_object(
-        const ModelObject* model_object,
-        int                      obj_idx,
-        const std::vector<int>& instance_idxs);
-
-    int load_object_volume(
-        const ModelObject* model_object,
-        int                obj_idx,
-        int                volume_idx,
-        int                instance_idx);
-
-    // Load SLA auxiliary GLVolumes (for support trees or pad).
-    void load_object_auxiliary(
-        const SLAPrintObject* print_object,
-        int                             obj_idx,
-        // pairs of <instance_idx, print_instance_idx>
-        const std::vector<std::pair<size_t, size_t>>& instances,
-        SLAPrintObjectStep              milestone,
-        // Timestamp of the last change of the milestone
-        size_t                          timestamp);
-
-#if ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL
-    int load_wipe_tower_preview(
-        float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width);
-#else
-    int load_wipe_tower_preview(
-        int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width);
-#endif // ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL
-#else
-    std::vector<int> load_object(
-        const ModelObject 		*model_object,
-        int                      obj_idx,
-        const std::vector<int>	&instance_idxs,
-        bool 					 opengl_initialized);
-
-    int load_object_volume(
-        const ModelObject *model_object,
-        int                obj_idx,
-        int                volume_idx,
-        int                instance_idx,
-        bool 			   opengl_initialized);
-
-    // Load SLA auxiliary GLVolumes (for support trees or pad).
-    void load_object_auxiliary(
-        const SLAPrintObject           *print_object,
-        int                             obj_idx,
-        // pairs of <instance_idx, print_instance_idx>
-        const std::vector<std::pair<size_t, size_t>>& instances,
-        SLAPrintObjectStep              milestone,
-        // Timestamp of the last change of the milestone
-        size_t                          timestamp,
-        bool 			   				opengl_initialized);
-
-#if ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL
-    int load_wipe_tower_preview(
-        float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width, bool opengl_initialized);
-#else
-    int load_wipe_tower_preview(
-        int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width, bool opengl_initialized);
-#endif // ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLVolume* new_toolpath_volume(const ColorRGBA& rgba);
-    GLVolume* new_nontoolpath_volume(const ColorRGBA& rgba);
-#else
-    GLVolume* new_toolpath_volume(const ColorRGBA& rgba, size_t reserve_vbo_floats = 0);
-    GLVolume* new_nontoolpath_volume(const ColorRGBA& rgba, size_t reserve_vbo_floats = 0);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    // Render the volumes by OpenGL.
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    void render(ERenderType type, bool disable_cullface, const Transform3d& view_matrix, const Transform3d& projection_matrix,
-        std::function<bool(const GLVolume&)> filter_func = std::function<bool(const GLVolume&)>()) const;
-#else
-    void render(ERenderType type, bool disable_cullface, const Transform3d& view_matrix, std::function<bool(const GLVolume&)> filter_func = std::function<bool(const GLVolume&)>()) const;
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-#if !ENABLE_LEGACY_OPENGL_REMOVAL
-    // Finalize the initialization of the geometry & indices,
-    // upload the geometry and indices to OpenGL VBO objects
-    // and shrink the allocated data, possibly relasing it if it has been loaded into the VBOs.
-    void finalize_geometry(bool opengl_initialized) { for (auto* v : volumes) v->finalize_geometry(opengl_initialized); }
-    // Release the geometry data assigned to the volumes.
-    // If OpenGL VBOs were allocated, an OpenGL context has to be active to release them.
-    void release_geometry() { for (auto *v : volumes) v->release_geometry(); }
-#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
-    // Clear the geometry
-    void clear() { for (auto *v : volumes) delete v; volumes.clear(); }
-
-    bool empty() const { return volumes.empty(); }
-    void set_range(double low, double high) { for (GLVolume* vol : this->volumes) vol->set_range(low, high); }
-
-    void set_print_volume(const PrintVolume& print_volume) { m_print_volume = print_volume; }
-
-    void set_z_range(float min_z, float max_z) { m_z_range[0] = min_z; m_z_range[1] = max_z; }
-    void set_clipping_plane(const std::array<double, 4>& coeffs) { m_clipping_plane = coeffs; }
-
-    const std::array<float, 2>& get_z_range() const { return m_z_range; }
-    const std::array<double, 4>& get_clipping_plane() const { return m_clipping_plane; }
-
-    bool is_slope_active() const { return m_slope.active; }
-    void set_slope_active(bool active) { m_slope.active = active; }
-
-    float get_slope_normal_z() const { return m_slope.normal_z; }
-    void set_slope_normal_z(float normal_z) { m_slope.normal_z = normal_z; }
-    void set_default_slope_normal_z() { m_slope.normal_z = -::cos(Geometry::deg2rad(90.0f - 45.0f)); }
-    void set_show_sinking_contours(bool show) { m_show_sinking_contours = show; }
-#if ENABLE_SHOW_NON_MANIFOLD_EDGES
-    void set_show_non_manifold_edges(bool show) { m_show_non_manifold_edges = show; }
-#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES
-
-    // returns true if all the volumes are completely contained in the print volume
-    // returns the containment state in the given out_state, if non-null
-    bool check_outside_state(const Slic3r::BuildVolume& build_volume, ModelInstanceEPrintVolumeState* out_state) const;
-    void reset_outside_state();
-
-    void update_colors_by_extruder(const DynamicPrintConfig* config);
-
-    // Returns a vector containing the sorted list of all the print_zs of the volumes contained in this collection
-    std::vector<double> get_current_print_zs(bool active_only) const;
-
-    // Return an estimate of the memory consumed by this class.
-    size_t 				cpu_memory_used() const;
-    // Return an estimate of the memory held by GPU vertex buffers.
-    size_t 				gpu_memory_used() const;
-    size_t 				total_memory_used() const { return this->cpu_memory_used() + this->gpu_memory_used(); }
-    // Return CPU, GPU and total memory log line.
-    std::string         log_memory_info() const;
-
-private:
-    GLVolumeCollection(const GLVolumeCollection &other);
-    GLVolumeCollection& operator=(const GLVolumeCollection &);
-};
-
-GLVolumeWithIdAndZList volumes_to_render(const GLVolumePtrs& volumes, GLVolumeCollection::ERenderType type, const Transform3d& view_matrix, std::function<bool(const GLVolume&)> filter_func = nullptr);
-
-struct _3DScene
-{
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    static void thick_lines_to_verts(const Lines& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, double top_z, GUI::GLModel::Geometry& geometry);
-    static void thick_lines_to_verts(const Lines3& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, GUI::GLModel::Geometry& geometry);
-    static void extrusionentity_to_verts(const ExtrusionPath& extrusion_path, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);
-    static void extrusionentity_to_verts(const ExtrusionLoop& extrusion_loop, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);
-    static void extrusionentity_to_verts(const ExtrusionMultiPath& extrusion_multi_path, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);
-    static void extrusionentity_to_verts(const ExtrusionEntityCollection& extrusion_entity_collection, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);
-    static void extrusionentity_to_verts(const ExtrusionEntity* extrusion_entity, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);
-#else
-    static void thick_lines_to_verts(const Lines& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, double top_z, GLVolume& volume);
-    static void thick_lines_to_verts(const Lines3& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, GLVolume& volume);
-    static void extrusionentity_to_verts(const Polyline& polyline, float width, float height, float print_z, GLVolume& volume);
-    static void extrusionentity_to_verts(const ExtrusionPath& extrusion_path, float print_z, GLVolume& volume);
-    static void extrusionentity_to_verts(const ExtrusionPath& extrusion_path, float print_z, const Point& copy, GLVolume& volume);
-    static void extrusionentity_to_verts(const ExtrusionLoop& extrusion_loop, float print_z, const Point& copy, GLVolume& volume);
-    static void extrusionentity_to_verts(const ExtrusionMultiPath& extrusion_multi_path, float print_z, const Point& copy, GLVolume& volume);
-    static void extrusionentity_to_verts(const ExtrusionEntityCollection& extrusion_entity_collection, float print_z, const Point& copy, GLVolume& volume);
-    static void extrusionentity_to_verts(const ExtrusionEntity* extrusion_entity, float print_z, const Point& copy, GLVolume& volume);
-    static void polyline3_to_verts(const Polyline3& polyline, double width, double height, GLVolume& volume);
-    static void point3_to_verts(const Vec3crd& point, double width, double height, GLVolume& volume);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-};
-
-}
-
-#endif
+#ifndef slic3r_3DScene_hpp_

+#define slic3r_3DScene_hpp_

+

+#include "libslic3r/libslic3r.h"

+#include "libslic3r/Point.hpp"

+#include "libslic3r/Line.hpp"

+#include "libslic3r/TriangleMesh.hpp"

+#include "libslic3r/Utils.hpp"

+#include "libslic3r/Geometry.hpp"

+#include "libslic3r/Color.hpp"

+

+#include "GLModel.hpp"

+

+#include <functional>

+#include <optional>

+

+#ifndef NDEBUG

+#define HAS_GLSAFE

+#endif // NDEBUG

+

+#ifdef HAS_GLSAFE

+    extern void glAssertRecentCallImpl(const char *file_name, unsigned int line, const char *function_name);

+    inline void glAssertRecentCall() { glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); }

+    #define glsafe(cmd) do { cmd; glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); } while (false)

+    #define glcheck() do { glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); } while (false)

+#else // HAS_GLSAFE

+    inline void glAssertRecentCall() { }

+    #define glsafe(cmd) cmd

+    #define glcheck()

+#endif // HAS_GLSAFE

+

+namespace Slic3r {

+class SLAPrintObject;

+enum  SLAPrintObjectStep : unsigned int;

+class BuildVolume;

+class DynamicPrintConfig;

+class ExtrusionPath;

+class ExtrusionMultiPath;

+class ExtrusionLoop;

+class ExtrusionEntity;

+class ExtrusionEntityCollection;

+class ModelObject;

+class ModelVolume;

+enum ModelInstanceEPrintVolumeState : unsigned char;

+

+// Return appropriate color based on the ModelVolume.

+extern ColorRGBA color_from_model_volume(const ModelVolume& model_volume);

+

+#if !ENABLE_LEGACY_OPENGL_REMOVAL

+// A container for interleaved arrays of 3D vertices and normals,

+// possibly indexed by triangles and / or quads.

+class GLIndexedVertexArray {

+public:

+    // Only Eigen types of Nx16 size are vectorized. This bounding box will not be vectorized.

+    static_assert(sizeof(Eigen::AlignedBox<float, 3>) == 24, "Eigen::AlignedBox<float, 3> is not being vectorized, thus it does not need to be aligned");

+    using BoundingBox = Eigen::AlignedBox<float, 3>;

+

+    GLIndexedVertexArray() { m_bounding_box.setEmpty(); }

+    GLIndexedVertexArray(const GLIndexedVertexArray &rhs) :

+        vertices_and_normals_interleaved(rhs.vertices_and_normals_interleaved),

+        triangle_indices(rhs.triangle_indices),

+        quad_indices(rhs.quad_indices),

+        m_bounding_box(rhs.m_bounding_box)

+        { assert(! rhs.has_VBOs()); m_bounding_box.setEmpty(); }

+    GLIndexedVertexArray(GLIndexedVertexArray &&rhs) :

+        vertices_and_normals_interleaved(std::move(rhs.vertices_and_normals_interleaved)),

+        triangle_indices(std::move(rhs.triangle_indices)),

+        quad_indices(std::move(rhs.quad_indices)),

+        m_bounding_box(rhs.m_bounding_box)

+        { assert(! rhs.has_VBOs()); }

+

+    ~GLIndexedVertexArray() { release_geometry(); }

+

+    GLIndexedVertexArray& operator=(const GLIndexedVertexArray &rhs)

+    {

+        assert(vertices_and_normals_interleaved_VBO_id == 0);

+        assert(triangle_indices_VBO_id == 0);

+        assert(quad_indices_VBO_id == 0);

+        assert(rhs.vertices_and_normals_interleaved_VBO_id == 0);

+        assert(rhs.triangle_indices_VBO_id == 0);

+        assert(rhs.quad_indices_VBO_id == 0);

+        this->vertices_and_normals_interleaved 		 = rhs.vertices_and_normals_interleaved;

+        this->triangle_indices                 		 = rhs.triangle_indices;

+        this->quad_indices                     		 = rhs.quad_indices;

+        this->m_bounding_box                   		 = rhs.m_bounding_box;

+        this->vertices_and_normals_interleaved_size  = rhs.vertices_and_normals_interleaved_size;

+        this->triangle_indices_size                  = rhs.triangle_indices_size;

+        this->quad_indices_size                      = rhs.quad_indices_size;

+        return *this;

+    }

+

+    GLIndexedVertexArray& operator=(GLIndexedVertexArray &&rhs) 

+    {

+        assert(vertices_and_normals_interleaved_VBO_id == 0);

+        assert(triangle_indices_VBO_id == 0);

+        assert(quad_indices_VBO_id == 0);

+        assert(rhs.vertices_and_normals_interleaved_VBO_id == 0);

+        assert(rhs.triangle_indices_VBO_id == 0);

+        assert(rhs.quad_indices_VBO_id == 0);

+        this->vertices_and_normals_interleaved 		 = std::move(rhs.vertices_and_normals_interleaved);

+        this->triangle_indices                 		 = std::move(rhs.triangle_indices);

+        this->quad_indices                     		 = std::move(rhs.quad_indices);

+        this->m_bounding_box                   		 = rhs.m_bounding_box;

+        this->vertices_and_normals_interleaved_size  = rhs.vertices_and_normals_interleaved_size;

+        this->triangle_indices_size                  = rhs.triangle_indices_size;

+        this->quad_indices_size                      = rhs.quad_indices_size;

+        return *this;

+    }

+

+    // Vertices and their normals, interleaved to be used by void glInterleavedArrays(GL_N3F_V3F, 0, x)

+    std::vector<float> vertices_and_normals_interleaved;

+    std::vector<int>   triangle_indices;

+    std::vector<int>   quad_indices;

+

+    // When the geometry data is loaded into the graphics card as Vertex Buffer Objects,

+    // the above mentioned std::vectors are cleared and the following variables keep their original length.

+    size_t vertices_and_normals_interleaved_size{ 0 };

+    size_t triangle_indices_size{ 0 };

+    size_t quad_indices_size{ 0 };

+

+    // IDs of the Vertex Array Objects, into which the geometry has been loaded.

+    // Zero if the VBOs are not sent to GPU yet.

+    unsigned int       vertices_and_normals_interleaved_VBO_id{ 0 };

+    unsigned int       triangle_indices_VBO_id{ 0 };

+    unsigned int       quad_indices_VBO_id{ 0 };

+

+#if ENABLE_SMOOTH_NORMALS

+    void load_mesh_full_shading(const TriangleMesh& mesh, bool smooth_normals = false);

+    void load_mesh(const TriangleMesh& mesh, bool smooth_normals = false) { this->load_mesh_full_shading(mesh, smooth_normals); }

+#else

+    void load_mesh_full_shading(const TriangleMesh& mesh);

+    void load_mesh(const TriangleMesh& mesh) { this->load_mesh_full_shading(mesh); }

+#endif // ENABLE_SMOOTH_NORMALS

+

+    void load_its_flat_shading(const indexed_triangle_set &its);

+

+    inline bool has_VBOs() const { return vertices_and_normals_interleaved_VBO_id != 0; }

+

+    inline void reserve(size_t sz) {

+        this->vertices_and_normals_interleaved.reserve(sz * 6);

+        this->triangle_indices.reserve(sz * 3);

+        this->quad_indices.reserve(sz * 4);

+    }

+

+    inline void push_geometry(float x, float y, float z, float nx, float ny, float nz) {

+        assert(this->vertices_and_normals_interleaved_VBO_id == 0);

+        if (this->vertices_and_normals_interleaved_VBO_id != 0)

+            return;

+

+        if (this->vertices_and_normals_interleaved.size() + 6 > this->vertices_and_normals_interleaved.capacity())

+            this->vertices_and_normals_interleaved.reserve(next_highest_power_of_2(this->vertices_and_normals_interleaved.size() + 6));

+        this->vertices_and_normals_interleaved.emplace_back(nx);

+        this->vertices_and_normals_interleaved.emplace_back(ny);

+        this->vertices_and_normals_interleaved.emplace_back(nz);

+        this->vertices_and_normals_interleaved.emplace_back(x);

+        this->vertices_and_normals_interleaved.emplace_back(y);

+        this->vertices_and_normals_interleaved.emplace_back(z);

+

+        this->vertices_and_normals_interleaved_size = this->vertices_and_normals_interleaved.size();

+        m_bounding_box.extend(Vec3f(x, y, z));

+    };

+

+    inline void push_geometry(double x, double y, double z, double nx, double ny, double nz) {

+        push_geometry(float(x), float(y), float(z), float(nx), float(ny), float(nz));

+    }

+

+    template<typename Derived, typename Derived2>

+    inline void push_geometry(const Eigen::MatrixBase<Derived>& p, const Eigen::MatrixBase<Derived2>& n) {

+        push_geometry(float(p(0)), float(p(1)), float(p(2)), float(n(0)), float(n(1)), float(n(2)));

+    }

+

+    inline void push_triangle(int idx1, int idx2, int idx3) {

+        assert(this->vertices_and_normals_interleaved_VBO_id == 0);

+        if (this->vertices_and_normals_interleaved_VBO_id != 0)

+            return;

+

+        if (this->triangle_indices.size() + 3 > this->vertices_and_normals_interleaved.capacity())

+            this->triangle_indices.reserve(next_highest_power_of_2(this->triangle_indices.size() + 3));

+        this->triangle_indices.emplace_back(idx1);

+        this->triangle_indices.emplace_back(idx2);

+        this->triangle_indices.emplace_back(idx3);

+        this->triangle_indices_size = this->triangle_indices.size();

+    };

+

+    inline void push_quad(int idx1, int idx2, int idx3, int idx4) {

+        assert(this->vertices_and_normals_interleaved_VBO_id == 0);

+        if (this->vertices_and_normals_interleaved_VBO_id != 0)

+            return;

+

+        if (this->quad_indices.size() + 4 > this->vertices_and_normals_interleaved.capacity())

+            this->quad_indices.reserve(next_highest_power_of_2(this->quad_indices.size() + 4));

+        this->quad_indices.emplace_back(idx1);

+        this->quad_indices.emplace_back(idx2);

+        this->quad_indices.emplace_back(idx3);

+        this->quad_indices.emplace_back(idx4);

+        this->quad_indices_size = this->quad_indices.size();

+    };

+

+    // Finalize the initialization of the geometry & indices,

+    // upload the geometry and indices to OpenGL VBO objects

+    // and shrink the allocated data, possibly relasing it if it has been loaded into the VBOs.

+    void finalize_geometry(bool opengl_initialized);

+    // Release the geometry data, release OpenGL VBOs.

+    void release_geometry();

+

+    void render() const;

+    void render(const std::pair<size_t, size_t>& tverts_range, const std::pair<size_t, size_t>& qverts_range) const;

+

+    // Is there any geometry data stored?

+    bool empty() const { return vertices_and_normals_interleaved_size == 0; }

+

+    void clear() {

+        this->vertices_and_normals_interleaved.clear();

+        this->triangle_indices.clear();

+        this->quad_indices.clear();

+        vertices_and_normals_interleaved_size = 0;

+        triangle_indices_size = 0;

+        quad_indices_size = 0;

+        m_bounding_box.setEmpty();

+    }

+

+    // Shrink the internal storage to tighly fit the data stored.

+    void shrink_to_fit() {

+        this->vertices_and_normals_interleaved.shrink_to_fit();

+        this->triangle_indices.shrink_to_fit();

+        this->quad_indices.shrink_to_fit();

+    }

+

+    const BoundingBox& bounding_box() const { return m_bounding_box; }

+

+    // Return an estimate of the memory consumed by this class.

+    size_t cpu_memory_used() const { return sizeof(*this) + vertices_and_normals_interleaved.capacity() * sizeof(float) + triangle_indices.capacity() * sizeof(int) + quad_indices.capacity() * sizeof(int); }

+    // Return an estimate of the memory held by GPU vertex buffers.

+    size_t gpu_memory_used() const

+    {

+    	size_t memsize = 0;

+    	if (this->vertices_and_normals_interleaved_VBO_id != 0)

+    		memsize += this->vertices_and_normals_interleaved_size * 4;

+    	if (this->triangle_indices_VBO_id != 0)

+    		memsize += this->triangle_indices_size * 4;

+    	if (this->quad_indices_VBO_id != 0)

+    		memsize += this->quad_indices_size * 4;

+    	return memsize;

+    }

+    size_t total_memory_used() const { return this->cpu_memory_used() + this->gpu_memory_used(); }

+

+private:

+    BoundingBox m_bounding_box;

+};

+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL

+

+class GLVolume {

+public:

+    static const ColorRGBA SELECTED_COLOR;

+    static const ColorRGBA HOVER_SELECT_COLOR;

+    static const ColorRGBA HOVER_DESELECT_COLOR;

+    static const ColorRGBA OUTSIDE_COLOR;

+    static const ColorRGBA SELECTED_OUTSIDE_COLOR;

+    static const ColorRGBA DISABLED_COLOR;

+    static const ColorRGBA SLA_SUPPORT_COLOR;

+    static const ColorRGBA SLA_PAD_COLOR;

+    static const ColorRGBA NEUTRAL_COLOR;

+    static const std::array<ColorRGBA, 4> MODEL_COLOR;

+

+    enum EHoverState : unsigned char

+    {

+        HS_None,

+        HS_Hover,

+        HS_Select,

+        HS_Deselect

+    };

+

+    GLVolume(float r = 1.0f, float g = 1.0f, float b = 1.0f, float a = 1.0f);

+    GLVolume(const ColorRGBA& color) : GLVolume(color.r(), color.g(), color.b(), color.a()) {}

+

+private:

+    Geometry::Transformation m_instance_transformation;

+    Geometry::Transformation m_volume_transformation;

+

+    // Shift in z required by sla supports+pad

+    double        m_sla_shift_z;

+    // Bounding box of this volume, in unscaled coordinates.

+    std::optional<BoundingBoxf3> m_transformed_bounding_box;

+    // Convex hull of the volume, if any.

+    std::shared_ptr<const TriangleMesh> m_convex_hull;

+    // Bounding box of this volume, in unscaled coordinates.

+    std::optional<BoundingBoxf3> m_transformed_convex_hull_bounding_box;

+    // Bounding box of the non sinking part of this volume, in unscaled coordinates.

+    std::optional<BoundingBoxf3> m_transformed_non_sinking_bounding_box;

+

+    class SinkingContours

+    {

+        static const float HalfWidth;

+        GLVolume& m_parent;

+        GUI::GLModel m_model;

+        BoundingBoxf3 m_old_box;

+        Vec3d m_shift{ Vec3d::Zero() };

+

+    public:

+        SinkingContours(GLVolume& volume) : m_parent(volume) {}

+        void render();

+

+    private:

+        void update();

+    };

+

+    SinkingContours m_sinking_contours;

+

+#if ENABLE_SHOW_NON_MANIFOLD_EDGES

+    class NonManifoldEdges

+    {

+        GLVolume& m_parent;

+        GUI::GLModel m_model;

+        bool m_update_needed{ true };

+

+    public:

+        NonManifoldEdges(GLVolume& volume) : m_parent(volume) {}

+        void render();

+        void set_as_dirty() { m_update_needed = true; }

+

+    private:

+        void update();

+    };

+

+    NonManifoldEdges m_non_manifold_edges;

+#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES

+

+public:

+    // Color of the triangles / quads held by this volume.

+    ColorRGBA color;

+    // Color used to render this volume.

+    ColorRGBA render_color;

+

+    struct CompositeID {

+        CompositeID(int object_id, int volume_id, int instance_id) : object_id(object_id), volume_id(volume_id), instance_id(instance_id) {}

+        CompositeID() : object_id(-1), volume_id(-1), instance_id(-1) {}

+        // Object ID, which is equal to the index of the respective ModelObject in Model.objects array.

+        int             object_id;

+        // Volume ID, which is equal to the index of the respective ModelVolume in ModelObject.volumes array.

+        // If negative, it is an index of a geometry produced by the PrintObject for the respective ModelObject,

+        // and which has no associated ModelVolume in ModelObject.volumes. For example, SLA supports.

+        // Volume with a negative volume_id cannot be picked independently, it will pick the associated instance.

+        int             volume_id;

+        // Instance ID, which is equal to the index of the respective ModelInstance in ModelObject.instances array.

+        int             instance_id;

+		bool operator==(const CompositeID &rhs) const { return object_id == rhs.object_id && volume_id == rhs.volume_id && instance_id == rhs.instance_id; }

+		bool operator!=(const CompositeID &rhs) const { return ! (*this == rhs); }

+		bool operator< (const CompositeID &rhs) const 

+			{ return object_id < rhs.object_id || (object_id == rhs.object_id && (volume_id < rhs.volume_id || (volume_id == rhs.volume_id && instance_id < rhs.instance_id))); }

+    };

+    CompositeID         composite_id;

+    // Fingerprint of the source geometry. For ModelVolumes, it is the ModelVolume::ID and ModelInstanceID, 

+    // for generated volumes it is the timestamp generated by PrintState::invalidate() or PrintState::set_done(),

+    // and the associated ModelInstanceID.

+    // Valid geometry_id should always be positive.

+    std::pair<size_t, size_t> geometry_id;

+    // An ID containing the extruder ID (used to select color).

+    int                 	extruder_id;

+

+    // Various boolean flags.

+    struct {

+	    // Is this object selected?

+	    bool                selected : 1;

+	    // Is this object disabled from selection?

+	    bool                disabled : 1;

+	    // Is this object printable?

+	    bool                printable : 1;

+	    // Whether or not this volume is active for rendering

+	    bool                is_active : 1;

+	    // Whether or not to use this volume when applying zoom_to_volumes()

+	    bool                zoom_to_volumes : 1;

+	    // Wheter or not this volume is enabled for outside print volume detection in shader.

+	    bool                shader_outside_printer_detection_enabled : 1;

+	    // Wheter or not this volume is outside print volume.

+	    bool                is_outside : 1;

+	    // Wheter or not this volume has been generated from a modifier

+	    bool                is_modifier : 1;

+	    // Wheter or not this volume has been generated from the wipe tower

+	    bool                is_wipe_tower : 1;

+	    // Wheter or not this volume has been generated from an extrusion path

+	    bool                is_extrusion_path : 1;

+        // Whether or not always use the volume's own color (not using SELECTED/HOVER/DISABLED/OUTSIDE)

+	    bool                force_native_color : 1;

+        // Whether or not render this volume in neutral

+        bool                force_neutral_color : 1;

+        // Whether or not to force rendering of sinking contours

+        bool                force_sinking_contours : 1;

+    };

+

+    // Is mouse or rectangle selection over this object to select/deselect it ?

+    EHoverState         	hover;

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GUI::GLModel            model;

+#else

+    // Interleaved triangles & normals with indexed triangles & quads.

+    GLIndexedVertexArray        indexed_vertex_array;

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    // Ranges of triangle and quad indices to be rendered.

+    std::pair<size_t, size_t>   tverts_range;

+#if !ENABLE_LEGACY_OPENGL_REMOVAL

+    std::pair<size_t, size_t>   qverts_range;

+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL

+

+    // If the qverts or tverts contain thick extrusions, then offsets keeps pointers of the starts

+    // of the extrusions per layer.

+    std::vector<coordf_t>       print_zs;

+    // Offset into qverts & tverts, or offsets into indices stored into an OpenGL name_index_buffer.

+    std::vector<size_t>         offsets;

+

+    // Bounding box of this volume, in unscaled coordinates.

+    BoundingBoxf3 bounding_box() const { 

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        return this->model.get_bounding_box();

+#else

+        BoundingBoxf3 out;

+        if (!this->indexed_vertex_array.bounding_box().isEmpty()) {

+            out.min = this->indexed_vertex_array.bounding_box().min().cast<double>();

+            out.max = this->indexed_vertex_array.bounding_box().max().cast<double>();

+            out.defined = true;

+        }

+        return out;

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    }

+

+    void set_color(const ColorRGBA& rgba)        { color = rgba; }

+    void set_render_color(const ColorRGBA& rgba) { render_color = rgba; }

+    // Sets render color in dependence of current state

+    void set_render_color(bool force_transparent);

+    // set color according to model volume

+    void set_color_from_model_volume(const ModelVolume& model_volume);

+

+    const Geometry::Transformation& get_instance_transformation() const { return m_instance_transformation; }

+    void set_instance_transformation(const Geometry::Transformation& transformation) { m_instance_transformation = transformation; set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_instance_offset() const { return m_instance_transformation.get_offset(); }

+#else

+    const Vec3d& get_instance_offset() const { return m_instance_transformation.get_offset(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_instance_offset(Axis axis) const { return m_instance_transformation.get_offset(axis); }

+

+    void set_instance_offset(const Vec3d& offset) { m_instance_transformation.set_offset(offset); set_bounding_boxes_as_dirty(); }

+    void set_instance_offset(Axis axis, double offset) { m_instance_transformation.set_offset(axis, offset); set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_instance_rotation() const { return m_instance_transformation.get_rotation(); }

+#else

+    const Vec3d& get_instance_rotation() const { return m_instance_transformation.get_rotation(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_instance_rotation(Axis axis) const { return m_instance_transformation.get_rotation(axis); }

+

+    void set_instance_rotation(const Vec3d& rotation) { m_instance_transformation.set_rotation(rotation); set_bounding_boxes_as_dirty(); }

+    void set_instance_rotation(Axis axis, double rotation) { m_instance_transformation.set_rotation(axis, rotation); set_bounding_boxes_as_dirty(); }

+

+    Vec3d get_instance_scaling_factor() const { return m_instance_transformation.get_scaling_factor(); }

+    double get_instance_scaling_factor(Axis axis) const { return m_instance_transformation.get_scaling_factor(axis); }

+

+    void set_instance_scaling_factor(const Vec3d& scaling_factor) { m_instance_transformation.set_scaling_factor(scaling_factor); set_bounding_boxes_as_dirty(); }

+    void set_instance_scaling_factor(Axis axis, double scaling_factor) { m_instance_transformation.set_scaling_factor(axis, scaling_factor); set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_instance_mirror() const { return m_instance_transformation.get_mirror(); }

+#else

+    const Vec3d& get_instance_mirror() const { return m_instance_transformation.get_mirror(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_instance_mirror(Axis axis) const { return m_instance_transformation.get_mirror(axis); }

+

+    void set_instance_mirror(const Vec3d& mirror) { m_instance_transformation.set_mirror(mirror); set_bounding_boxes_as_dirty(); }

+    void set_instance_mirror(Axis axis, double mirror) { m_instance_transformation.set_mirror(axis, mirror); set_bounding_boxes_as_dirty(); }

+

+    const Geometry::Transformation& get_volume_transformation() const { return m_volume_transformation; }

+    void set_volume_transformation(const Geometry::Transformation& transformation) { m_volume_transformation = transformation; set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_volume_offset() const { return m_volume_transformation.get_offset(); }

+#else

+    const Vec3d& get_volume_offset() const { return m_volume_transformation.get_offset(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_volume_offset(Axis axis) const { return m_volume_transformation.get_offset(axis); }

+

+    void set_volume_offset(const Vec3d& offset) { m_volume_transformation.set_offset(offset); set_bounding_boxes_as_dirty(); }

+    void set_volume_offset(Axis axis, double offset) { m_volume_transformation.set_offset(axis, offset); set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_volume_rotation() const { return m_volume_transformation.get_rotation(); }

+#else

+    const Vec3d& get_volume_rotation() const { return m_volume_transformation.get_rotation(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_volume_rotation(Axis axis) const { return m_volume_transformation.get_rotation(axis); }

+

+    void set_volume_rotation(const Vec3d& rotation) { m_volume_transformation.set_rotation(rotation); set_bounding_boxes_as_dirty(); }

+    void set_volume_rotation(Axis axis, double rotation) { m_volume_transformation.set_rotation(axis, rotation); set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_volume_scaling_factor() const { return m_volume_transformation.get_scaling_factor(); }

+#else

+    const Vec3d& get_volume_scaling_factor() const { return m_volume_transformation.get_scaling_factor(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_volume_scaling_factor(Axis axis) const { return m_volume_transformation.get_scaling_factor(axis); }

+

+    void set_volume_scaling_factor(const Vec3d& scaling_factor) { m_volume_transformation.set_scaling_factor(scaling_factor); set_bounding_boxes_as_dirty(); }

+    void set_volume_scaling_factor(Axis axis, double scaling_factor) { m_volume_transformation.set_scaling_factor(axis, scaling_factor); set_bounding_boxes_as_dirty(); }

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d get_volume_mirror() const { return m_volume_transformation.get_mirror(); }

+#else

+    const Vec3d& get_volume_mirror() const { return m_volume_transformation.get_mirror(); }

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    double get_volume_mirror(Axis axis) const { return m_volume_transformation.get_mirror(axis); }

+

+    void set_volume_mirror(const Vec3d& mirror) { m_volume_transformation.set_mirror(mirror); set_bounding_boxes_as_dirty(); }

+    void set_volume_mirror(Axis axis, double mirror) { m_volume_transformation.set_mirror(axis, mirror); set_bounding_boxes_as_dirty(); }

+     

+    double get_sla_shift_z() const { return m_sla_shift_z; }

+    void set_sla_shift_z(double z) { m_sla_shift_z = z; }

+

+    void set_convex_hull(std::shared_ptr<const TriangleMesh> convex_hull) { m_convex_hull = std::move(convex_hull); }

+    void set_convex_hull(const TriangleMesh &convex_hull) { m_convex_hull = std::make_shared<const TriangleMesh>(convex_hull); }

+    void set_convex_hull(TriangleMesh &&convex_hull) { m_convex_hull = std::make_shared<const TriangleMesh>(std::move(convex_hull)); }

+

+    int                 object_idx() const   { return this->composite_id.object_id; }

+    int                 volume_idx() const   { return this->composite_id.volume_id; }

+    int                 instance_idx() const { return this->composite_id.instance_id; }

+

+    Transform3d         world_matrix() const;

+    bool                is_left_handed() const;

+

+    const BoundingBoxf3& transformed_bounding_box() const;

+    // non-caching variant

+    BoundingBoxf3        transformed_convex_hull_bounding_box(const Transform3d &trafo) const;

+    // caching variant

+    const BoundingBoxf3& transformed_convex_hull_bounding_box() const;

+    // non-caching variant

+    BoundingBoxf3        transformed_non_sinking_bounding_box(const Transform3d& trafo) const;

+    // caching variant

+    const BoundingBoxf3& transformed_non_sinking_bounding_box() const;

+    // convex hull

+    const TriangleMesh*  convex_hull() const { return m_convex_hull.get(); }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    bool                empty() const { return this->model.is_empty(); }

+#else

+    bool                empty() const { return this->indexed_vertex_array.empty(); }

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    void                set_range(double low, double high);

+

+    void                render();

+

+#if !ENABLE_LEGACY_OPENGL_REMOVAL

+    void                finalize_geometry(bool opengl_initialized) { this->indexed_vertex_array.finalize_geometry(opengl_initialized); }

+    void                release_geometry() { this->indexed_vertex_array.release_geometry(); }

+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL

+

+    void                set_bounding_boxes_as_dirty() {

+        m_transformed_bounding_box.reset();

+        m_transformed_convex_hull_bounding_box.reset();

+        m_transformed_non_sinking_bounding_box.reset();

+    }

+

+    bool                is_sla_support() const;

+    bool                is_sla_pad() const;

+

+    bool                is_sinking() const;

+    bool                is_below_printbed() const;

+    void                render_sinking_contours();

+#if ENABLE_SHOW_NON_MANIFOLD_EDGES

+    void                render_non_manifold_edges();

+#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES

+

+    // Return an estimate of the memory consumed by this class.

+    size_t 				cpu_memory_used() const {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        return sizeof(*this) + this->model.cpu_memory_used() + this->print_zs.capacity() * sizeof(coordf_t) +

+               this->offsets.capacity() * sizeof(size_t);

+    }

+    // Return an estimate of the memory held by GPU vertex buffers.

+    size_t 				gpu_memory_used() const { return this->model.gpu_memory_used(); }

+#else

+        //FIXME what to do wih m_convex_hull?

+    	return sizeof(*this) - sizeof(this->indexed_vertex_array) + this->indexed_vertex_array.cpu_memory_used() + this->print_zs.capacity() * sizeof(coordf_t) + this->offsets.capacity() * sizeof(size_t);

+    }

+    // Return an estimate of the memory held by GPU vertex buffers.

+    size_t 				gpu_memory_used() const { return this->indexed_vertex_array.gpu_memory_used(); }

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    size_t 				total_memory_used() const { return this->cpu_memory_used() + this->gpu_memory_used(); }

+};

+

+typedef std::vector<GLVolume*> GLVolumePtrs;

+typedef std::pair<GLVolume*, std::pair<unsigned int, double>> GLVolumeWithIdAndZ;

+typedef std::vector<GLVolumeWithIdAndZ> GLVolumeWithIdAndZList;

+

+class GLVolumeCollection

+{

+public:

+    enum class ERenderType : unsigned char

+    {

+        Opaque,

+        Transparent,

+        All

+    };

+

+    struct PrintVolume

+    {

+        // see: Bed3D::EShapeType

+        int type{ 0 };

+        // data contains:

+        // Rectangle:

+        //   [0] = min.x, [1] = min.y, [2] = max.x, [3] = max.y

+        // Circle:

+        //   [0] = center.x, [1] = center.y, [3] = radius

+        std::array<float, 4> data;

+        //   [0] = min z, [1] = max z

+        std::array<float, 2> zs;

+    };

+

+private:

+    PrintVolume m_print_volume;

+

+    // z range for clipping in shaders

+    std::array<float, 2> m_z_range;

+

+    // plane coeffs for clipping in shaders

+    std::array<double, 4> m_clipping_plane;

+

+    struct Slope

+    {

+        // toggle for slope rendering 

+        bool active{ false };

+        float normal_z;

+    };

+

+    Slope m_slope;

+    bool m_show_sinking_contours{ false };

+#if ENABLE_SHOW_NON_MANIFOLD_EDGES

+    bool m_show_non_manifold_edges{ true };

+#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES

+

+public:

+    GLVolumePtrs volumes;

+

+    GLVolumeCollection() { set_default_slope_normal_z(); }

+    ~GLVolumeCollection() { clear(); }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    std::vector<int> load_object(

+        const ModelObject* model_object,

+        int                      obj_idx,

+        const std::vector<int>& instance_idxs);

+

+    int load_object_volume(

+        const ModelObject* model_object,

+        int                obj_idx,

+        int                volume_idx,

+        int                instance_idx);

+

+    // Load SLA auxiliary GLVolumes (for support trees or pad).

+    void load_object_auxiliary(

+        const SLAPrintObject* print_object,

+        int                             obj_idx,

+        // pairs of <instance_idx, print_instance_idx>

+        const std::vector<std::pair<size_t, size_t>>& instances,

+        SLAPrintObjectStep              milestone,

+        // Timestamp of the last change of the milestone

+        size_t                          timestamp);

+

+#if ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL

+    int load_wipe_tower_preview(

+        float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width);

+#else

+    int load_wipe_tower_preview(

+        int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width);

+#endif // ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL

+#else

+    std::vector<int> load_object(

+        const ModelObject 		*model_object,

+        int                      obj_idx,

+        const std::vector<int>	&instance_idxs,

+        bool 					 opengl_initialized);

+

+    int load_object_volume(

+        const ModelObject *model_object,

+        int                obj_idx,

+        int                volume_idx,

+        int                instance_idx,

+        bool 			   opengl_initialized);

+

+    // Load SLA auxiliary GLVolumes (for support trees or pad).

+    void load_object_auxiliary(

+        const SLAPrintObject           *print_object,

+        int                             obj_idx,

+        // pairs of <instance_idx, print_instance_idx>

+        const std::vector<std::pair<size_t, size_t>>& instances,

+        SLAPrintObjectStep              milestone,

+        // Timestamp of the last change of the milestone

+        size_t                          timestamp,

+        bool 			   				opengl_initialized);

+

+#if ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL

+    int load_wipe_tower_preview(

+        float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width, bool opengl_initialized);

+#else

+    int load_wipe_tower_preview(

+        int obj_idx, float pos_x, float pos_y, float width, float depth, float height, float rotation_angle, bool size_unknown, float brim_width, bool opengl_initialized);

+#endif // ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLVolume* new_toolpath_volume(const ColorRGBA& rgba);

+    GLVolume* new_nontoolpath_volume(const ColorRGBA& rgba);

+#else

+    GLVolume* new_toolpath_volume(const ColorRGBA& rgba, size_t reserve_vbo_floats = 0);

+    GLVolume* new_nontoolpath_volume(const ColorRGBA& rgba, size_t reserve_vbo_floats = 0);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    // Render the volumes by OpenGL.

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    void render(ERenderType type, bool disable_cullface, const Transform3d& view_matrix, const Transform3d& projection_matrix,

+        std::function<bool(const GLVolume&)> filter_func = std::function<bool(const GLVolume&)>()) const;

+#else

+    void render(ERenderType type, bool disable_cullface, const Transform3d& view_matrix, std::function<bool(const GLVolume&)> filter_func = std::function<bool(const GLVolume&)>()) const;

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+#if !ENABLE_LEGACY_OPENGL_REMOVAL

+    // Finalize the initialization of the geometry & indices,

+    // upload the geometry and indices to OpenGL VBO objects

+    // and shrink the allocated data, possibly relasing it if it has been loaded into the VBOs.

+    void finalize_geometry(bool opengl_initialized) { for (auto* v : volumes) v->finalize_geometry(opengl_initialized); }

+    // Release the geometry data assigned to the volumes.

+    // If OpenGL VBOs were allocated, an OpenGL context has to be active to release them.

+    void release_geometry() { for (auto *v : volumes) v->release_geometry(); }

+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL

+    // Clear the geometry

+    void clear() { for (auto *v : volumes) delete v; volumes.clear(); }

+

+    bool empty() const { return volumes.empty(); }

+    void set_range(double low, double high) { for (GLVolume* vol : this->volumes) vol->set_range(low, high); }

+

+    void set_print_volume(const PrintVolume& print_volume) { m_print_volume = print_volume; }

+

+    void set_z_range(float min_z, float max_z) { m_z_range[0] = min_z; m_z_range[1] = max_z; }

+    void set_clipping_plane(const std::array<double, 4>& coeffs) { m_clipping_plane = coeffs; }

+

+    const std::array<float, 2>& get_z_range() const { return m_z_range; }

+    const std::array<double, 4>& get_clipping_plane() const { return m_clipping_plane; }

+

+    bool is_slope_active() const { return m_slope.active; }

+    void set_slope_active(bool active) { m_slope.active = active; }

+

+    float get_slope_normal_z() const { return m_slope.normal_z; }

+    void set_slope_normal_z(float normal_z) { m_slope.normal_z = normal_z; }

+    void set_default_slope_normal_z() { m_slope.normal_z = -::cos(Geometry::deg2rad(90.0f - 45.0f)); }

+    void set_show_sinking_contours(bool show) { m_show_sinking_contours = show; }

+#if ENABLE_SHOW_NON_MANIFOLD_EDGES

+    void set_show_non_manifold_edges(bool show) { m_show_non_manifold_edges = show; }

+#endif // ENABLE_SHOW_NON_MANIFOLD_EDGES

+

+    // returns true if all the volumes are completely contained in the print volume

+    // returns the containment state in the given out_state, if non-null

+    bool check_outside_state(const Slic3r::BuildVolume& build_volume, ModelInstanceEPrintVolumeState* out_state) const;

+    void reset_outside_state();

+

+    void update_colors_by_extruder(const DynamicPrintConfig* config);

+

+    // Returns a vector containing the sorted list of all the print_zs of the volumes contained in this collection

+    std::vector<double> get_current_print_zs(bool active_only) const;

+

+    // Return an estimate of the memory consumed by this class.

+    size_t 				cpu_memory_used() const;

+    // Return an estimate of the memory held by GPU vertex buffers.

+    size_t 				gpu_memory_used() const;

+    size_t 				total_memory_used() const { return this->cpu_memory_used() + this->gpu_memory_used(); }

+    // Return CPU, GPU and total memory log line.

+    std::string         log_memory_info() const;

+

+private:

+    GLVolumeCollection(const GLVolumeCollection &other);

+    GLVolumeCollection& operator=(const GLVolumeCollection &);

+};

+

+GLVolumeWithIdAndZList volumes_to_render(const GLVolumePtrs& volumes, GLVolumeCollection::ERenderType type, const Transform3d& view_matrix, std::function<bool(const GLVolume&)> filter_func = nullptr);

+

+struct _3DScene

+{

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    static void thick_lines_to_verts(const Lines& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, double top_z, GUI::GLModel::Geometry& geometry);

+    static void thick_lines_to_verts(const Lines3& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, GUI::GLModel::Geometry& geometry);

+    static void extrusionentity_to_verts(const ExtrusionPath& extrusion_path, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);

+    static void extrusionentity_to_verts(const ExtrusionLoop& extrusion_loop, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);

+    static void extrusionentity_to_verts(const ExtrusionMultiPath& extrusion_multi_path, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);

+    static void extrusionentity_to_verts(const ExtrusionEntityCollection& extrusion_entity_collection, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);

+    static void extrusionentity_to_verts(const ExtrusionEntity* extrusion_entity, float print_z, const Point& copy, GUI::GLModel::Geometry& geometry);

+#else

+    static void thick_lines_to_verts(const Lines& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, double top_z, GLVolume& volume);

+    static void thick_lines_to_verts(const Lines3& lines, const std::vector<double>& widths, const std::vector<double>& heights, bool closed, GLVolume& volume);

+    static void extrusionentity_to_verts(const Polyline& polyline, float width, float height, float print_z, GLVolume& volume);

+    static void extrusionentity_to_verts(const ExtrusionPath& extrusion_path, float print_z, GLVolume& volume);

+    static void extrusionentity_to_verts(const ExtrusionPath& extrusion_path, float print_z, const Point& copy, GLVolume& volume);

+    static void extrusionentity_to_verts(const ExtrusionLoop& extrusion_loop, float print_z, const Point& copy, GLVolume& volume);

+    static void extrusionentity_to_verts(const ExtrusionMultiPath& extrusion_multi_path, float print_z, const Point& copy, GLVolume& volume);

+    static void extrusionentity_to_verts(const ExtrusionEntityCollection& extrusion_entity_collection, float print_z, const Point& copy, GLVolume& volume);

+    static void extrusionentity_to_verts(const ExtrusionEntity* extrusion_entity, float print_z, const Point& copy, GLVolume& volume);

+    static void polyline3_to_verts(const Polyline3& polyline, double width, double height, GLVolume& volume);

+    static void point3_to_verts(const Vec3crd& point, double width, double height, GLVolume& volume);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+};

+

+}

+

+#endif

diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 353577944..216c2f472 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -1532,7 +1532,11 @@ void ObjectList::load_modifier(const wxArrayString& input_files, ModelObject& mo
     // First (any) GLVolume of the selected instance. They all share the same instance matrix.
     const GLVolume* v = selection.get_volume(*selection.get_volume_idxs().begin());
     const Geometry::Transformation inst_transform = v->get_instance_transformation();
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    const Transform3d inv_inst_transform = inst_transform.get_matrix_no_offset().inverse();
+#else
     const Transform3d inv_inst_transform = inst_transform.get_matrix(true).inverse();
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
     const Vec3d instance_offset = v->get_instance_offset();
 
     for (size_t i = 0; i < input_files.size(); ++i) {
@@ -1660,7 +1664,11 @@ void ObjectList::load_generic_subobject(const std::string& type_name, const Mode
 		Vec3d(0., 0., 0.5 * mesh_bb.size().z() + instance_bb.min.z() - v->get_instance_offset().z()) :
         // Translate the new modifier to be pickable: move to the left front corner of the instance's bounding box, lift to print bed.
         Vec3d(instance_bb.max.x(), instance_bb.min.y(), instance_bb.min.z()) + 0.5 * mesh_bb.size() - v->get_instance_offset();
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    new_volume->set_offset(v->get_instance_transformation().get_matrix_no_offset().inverse() * offset);
+#else
     new_volume->set_offset(v->get_instance_transformation().get_matrix(true).inverse() * offset);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
     const wxString name = _L("Generic") + "-" + _(type_name);
     new_volume->name = into_u8(name);
diff --git a/src/slic3r/GUI/GUI_ObjectManipulation.cpp b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
index 96429c924..c73f5eb4a 100644
--- a/src/slic3r/GUI/GUI_ObjectManipulation.cpp
+++ b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
@@ -354,7 +354,11 @@ ObjectManipulation::ObjectManipulation(wxWindow* parent) :
                 const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());
             const double min_z = get_volume_min_z(*volume);
             if (!is_world_coordinates()) {
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+                const Vec3d diff = m_cache.position - volume->get_instance_transformation().get_matrix_no_offset().inverse() * (min_z * Vec3d::UnitZ());
+#else
                 const Vec3d diff = m_cache.position - volume->get_instance_transformation().get_matrix(true).inverse() * (min_z * Vec3d::UnitZ());
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
                 Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Drop to bed"));
                 change_position_value(0, diff.x());
@@ -381,7 +385,11 @@ ObjectManipulation::ObjectManipulation(wxWindow* parent) :
             const double min_z = selection.get_scaled_instance_bounding_box().min.z();
             if (!is_world_coordinates()) {
                 const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+                const Vec3d diff = m_cache.position - volume->get_instance_transformation().get_matrix_no_offset().inverse() * (min_z * Vec3d::UnitZ());
+#else
                 const Vec3d diff = m_cache.position - volume->get_instance_transformation().get_matrix(true).inverse() * (min_z * Vec3d::UnitZ());
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 
                 Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Drop to bed"));
                 change_position_value(0, diff.x());
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp
index 66b6dcf60..a52c85d67 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp
@@ -1,437 +1,441 @@
-#include "GLGizmoFdmSupports.hpp"
-
-#include "libslic3r/Model.hpp"
-
-//#include "slic3r/GUI/3DScene.hpp"
-#include "slic3r/GUI/GLCanvas3D.hpp"
-#include "slic3r/GUI/GUI_App.hpp"
-#include "slic3r/GUI/ImGuiWrapper.hpp"
-#include "slic3r/GUI/Plater.hpp"
-#include "slic3r/GUI/GUI_ObjectList.hpp"
-#include "slic3r/GUI/format.hpp"
-#include "slic3r/Utils/UndoRedo.hpp"
-
-
-#include <GL/glew.h>
-
-
-namespace Slic3r::GUI {
-
-
-
-void GLGizmoFdmSupports::on_shutdown()
-{
-    m_highlight_by_angle_threshold_deg = 0.f;
-    m_parent.use_slope(false);
-    m_parent.toggle_model_objects_visibility(true);
-}
-
-
-
-std::string GLGizmoFdmSupports::on_get_name() const
-{
-    return _u8L("Paint-on supports");
-}
-
-
-
-bool GLGizmoFdmSupports::on_init()
-{
-    m_shortcut_key = WXK_CONTROL_L;
-
-    m_desc["clipping_of_view"] = _L("Clipping of view") + ": ";
-    m_desc["reset_direction"]  = _L("Reset direction");
-    m_desc["cursor_size"]      = _L("Brush size") + ": ";
-    m_desc["cursor_type"]      = _L("Brush shape") + ": ";
-    m_desc["enforce_caption"]  = _L("Left mouse button") + ": ";
-    m_desc["enforce"]          = _L("Enforce supports");
-    m_desc["block_caption"]    = _L("Right mouse button") + ": ";
-    m_desc["block"]            = _L("Block supports");
-    m_desc["remove_caption"]   = _L("Shift + Left mouse button") + ": ";
-    m_desc["remove"]           = _L("Remove selection");
-    m_desc["remove_all"]       = _L("Remove all selection");
-    m_desc["circle"]           = _L("Circle");
-    m_desc["sphere"]           = _L("Sphere");
-    m_desc["pointer"]          = _L("Triangles");
-    m_desc["highlight_by_angle"] = _L("Highlight overhang by angle");
-    m_desc["enforce_button"]   = _L("Enforce");
-    m_desc["cancel"]           = _L("Cancel");
-
-    m_desc["tool_type"]        = _L("Tool type") + ": ";
-    m_desc["tool_brush"]       = _L("Brush");
-    m_desc["tool_smart_fill"]  = _L("Smart fill");
-
-    m_desc["smart_fill_angle"] = _L("Smart fill angle");
-
-    m_desc["split_triangles"]   = _L("Split triangles");
-    m_desc["on_overhangs_only"] = _L("On overhangs only");
-
-    return true;
-}
-
-void GLGizmoFdmSupports::render_painter_gizmo()
-{
-    const Selection& selection = m_parent.get_selection();
-
-    glsafe(::glEnable(GL_BLEND));
-    glsafe(::glEnable(GL_DEPTH_TEST));
-
-    render_triangles(selection);
-    m_c->object_clipper()->render_cut();
-    m_c->instances_hider()->render_cut();
-    render_cursor();
-
-    glsafe(::glDisable(GL_BLEND));
-}
-
-
-
-void GLGizmoFdmSupports::on_render_input_window(float x, float y, float bottom_limit)
-{
-    if (! m_c->selection_info()->model_object())
-        return;
-
-    const float approx_height = m_imgui->scaled(23.f);
-    y = std::min(y, bottom_limit - approx_height);
-    m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);
-
-    m_imgui->begin(get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);
-
-    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:
-    const float clipping_slider_left           = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x,
-                                                          m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(1.5f);
-    const float cursor_slider_left             = m_imgui->calc_text_size(m_desc.at("cursor_size")).x + m_imgui->scaled(1.f);
-    const float smart_fill_slider_left         = m_imgui->calc_text_size(m_desc.at("smart_fill_angle")).x + m_imgui->scaled(1.f);
-    const float autoset_slider_label_max_width = m_imgui->scaled(7.5f);
-    const float autoset_slider_left            = m_imgui->calc_text_size(m_desc.at("highlight_by_angle"), autoset_slider_label_max_width).x + m_imgui->scaled(1.f);
-
-    const float cursor_type_radio_circle  = m_imgui->calc_text_size(m_desc["circle"]).x + m_imgui->scaled(2.5f);
-    const float cursor_type_radio_sphere  = m_imgui->calc_text_size(m_desc["sphere"]).x + m_imgui->scaled(2.5f);
-    const float cursor_type_radio_pointer = m_imgui->calc_text_size(m_desc["pointer"]).x + m_imgui->scaled(2.5f);
-
-    const float button_width = m_imgui->calc_text_size(m_desc.at("remove_all")).x + m_imgui->scaled(1.f);
-    const float button_enforce_width = m_imgui->calc_text_size(m_desc.at("enforce_button")).x;
-    const float button_cancel_width = m_imgui->calc_text_size(m_desc.at("cancel")).x;
-    const float buttons_width = std::max(button_enforce_width, button_cancel_width) + m_imgui->scaled(0.5f);
-    const float minimal_slider_width = m_imgui->scaled(4.f);
-
-    const float tool_type_radio_left       = m_imgui->calc_text_size(m_desc["tool_type"]).x + m_imgui->scaled(1.f);
-    const float tool_type_radio_brush      = m_imgui->calc_text_size(m_desc["tool_brush"]).x + m_imgui->scaled(2.5f);
-    const float tool_type_radio_smart_fill = m_imgui->calc_text_size(m_desc["tool_smart_fill"]).x + m_imgui->scaled(2.5f);
-
-    const float split_triangles_checkbox_width   = m_imgui->calc_text_size(m_desc["split_triangles"]).x + m_imgui->scaled(2.5f);
-    const float on_overhangs_only_checkbox_width = m_imgui->calc_text_size(m_desc["on_overhangs_only"]).x + m_imgui->scaled(2.5f);
-
-    float caption_max    = 0.f;
-    float total_text_max = 0.f;
-    for (const auto &t : std::array<std::string, 3>{"enforce", "block", "remove"}) {
-        caption_max    = std::max(caption_max, m_imgui->calc_text_size(m_desc[t + "_caption"]).x);
-        total_text_max = std::max(total_text_max, m_imgui->calc_text_size(m_desc[t]).x);
-    }
-    total_text_max += caption_max + m_imgui->scaled(1.f);
-    caption_max    += m_imgui->scaled(1.f);
-
-    const float sliders_left_width = std::max(std::max(autoset_slider_left, smart_fill_slider_left), std::max(cursor_slider_left, clipping_slider_left));
-    const float slider_icon_width  = m_imgui->get_slider_icon_size().x;
-    float       window_width       = minimal_slider_width + sliders_left_width + slider_icon_width;
-    window_width = std::max(window_width, total_text_max);
-    window_width = std::max(window_width, button_width);
-    window_width = std::max(window_width, split_triangles_checkbox_width);
-    window_width = std::max(window_width, on_overhangs_only_checkbox_width);
-    window_width = std::max(window_width, cursor_type_radio_circle + cursor_type_radio_sphere + cursor_type_radio_pointer);
-    window_width = std::max(window_width, tool_type_radio_left + tool_type_radio_brush + tool_type_radio_smart_fill);
-    window_width = std::max(window_width, 2.f * buttons_width + m_imgui->scaled(1.f));
-
-    auto draw_text_with_caption = [this, &caption_max](const wxString& caption, const wxString& text) {
-        m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, caption);
-        ImGui::SameLine(caption_max);
-        m_imgui->text(text);
-    };
-
-    for (const auto &t : std::array<std::string, 3>{"enforce", "block", "remove"})
-        draw_text_with_caption(m_desc.at(t + "_caption"), m_desc.at(t));
-
-    ImGui::Separator();
-
-    float position_before_text_y = ImGui::GetCursorPos().y;
-    ImGui::AlignTextToFramePadding();
-    m_imgui->text_wrapped(m_desc["highlight_by_angle"] + ":", autoset_slider_label_max_width);
-    ImGui::AlignTextToFramePadding();
-    float position_after_text_y  = ImGui::GetCursorPos().y;
-    std::string format_str = std::string("%.f") + I18N::translate_utf8("°",
-        "Degree sign to use in the respective slider in FDM supports gizmo,"
-        "placed after the number with no whitespace in between.");
-    ImGui::SameLine(sliders_left_width);
-
-    float slider_height = m_imgui->get_slider_float_height();
-    // Makes slider to be aligned to bottom of the multi-line text.
-    float slider_start_position_y = std::max(position_before_text_y, position_after_text_y - slider_height);
-    ImGui::SetCursorPosY(slider_start_position_y);
-
-    ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);
-    wxString tooltip = format_wxstr(_L("Preselects faces by overhang angle. It is possible to restrict paintable facets to only preselected faces when "
-            "the option \"%1%\" is enabled."), m_desc["on_overhangs_only"]);
-    if (m_imgui->slider_float("##angle_threshold_deg", &m_highlight_by_angle_threshold_deg, 0.f, 90.f, format_str.data(), 1.0f, true, tooltip)) {
-        m_parent.set_slope_normal_angle(90.f - m_highlight_by_angle_threshold_deg);
-        if (! m_parent.is_using_slope()) {
-            m_parent.use_slope(true);
-            m_parent.set_as_dirty();
-        }
-    }
-
-    // Restores the cursor position to be below the multi-line text.
-    ImGui::SetCursorPosY(std::max(position_before_text_y + slider_height, position_after_text_y));
-
-    const float max_tooltip_width = ImGui::GetFontSize() * 20.0f;
-
-    m_imgui->disabled_begin(m_highlight_by_angle_threshold_deg == 0.f);
-    ImGui::NewLine();
-    ImGui::SameLine(window_width - 2.f*buttons_width - m_imgui->scaled(0.5f));
-    if (m_imgui->button(m_desc["enforce_button"], buttons_width, 0.f)) {
-        select_facets_by_angle(m_highlight_by_angle_threshold_deg, false);
-        m_highlight_by_angle_threshold_deg = 0.f;
-        m_parent.use_slope(false);
-    }
-    ImGui::SameLine(window_width - buttons_width);
-    if (m_imgui->button(m_desc["cancel"], buttons_width, 0.f)) {
-        m_highlight_by_angle_threshold_deg = 0.f;
-        m_parent.use_slope(false);
-    }
-    m_imgui->disabled_end();
-
-
-    ImGui::Separator();
-
-    ImGui::AlignTextToFramePadding();
-    m_imgui->text(m_desc["tool_type"]);
-
-    float tool_type_offset = tool_type_radio_left + (window_width - tool_type_radio_left - tool_type_radio_brush - tool_type_radio_smart_fill + m_imgui->scaled(0.5f)) / 2.f;
-    ImGui::SameLine(tool_type_offset);
-    ImGui::PushItemWidth(tool_type_radio_brush);
-    if (m_imgui->radio_button(m_desc["tool_brush"], m_tool_type == ToolType::BRUSH))
-        m_tool_type = ToolType::BRUSH;
-
-    if (ImGui::IsItemHovered())
-        m_imgui->tooltip(_L("Paints facets according to the chosen painting brush."), max_tooltip_width);
-
-    ImGui::SameLine(tool_type_offset + tool_type_radio_brush);
-    ImGui::PushItemWidth(tool_type_radio_smart_fill);
-    if (m_imgui->radio_button(m_desc["tool_smart_fill"], m_tool_type == ToolType::SMART_FILL))
-        m_tool_type = ToolType::SMART_FILL;
-
-    if (ImGui::IsItemHovered())
-        m_imgui->tooltip(_L("Paints neighboring facets whose relative angle is less or equal to set angle."), max_tooltip_width);
-
-    m_imgui->checkbox(m_desc["on_overhangs_only"], m_paint_on_overhangs_only);
-    if (ImGui::IsItemHovered())
-        m_imgui->tooltip(format_wxstr(_L("Allows painting only on facets selected by: \"%1%\""), m_desc["highlight_by_angle"]), max_tooltip_width);
-
-    ImGui::Separator();
-
-    if (m_tool_type == ToolType::BRUSH) {
-        m_imgui->text(m_desc.at("cursor_type"));
-        ImGui::NewLine();
-
-        float cursor_type_offset = (window_width - cursor_type_radio_sphere - cursor_type_radio_circle - cursor_type_radio_pointer + m_imgui->scaled(1.5f)) / 2.f;
-        ImGui::SameLine(cursor_type_offset);
-        ImGui::PushItemWidth(cursor_type_radio_sphere);
-        if (m_imgui->radio_button(m_desc["sphere"], m_cursor_type == TriangleSelector::CursorType::SPHERE))
-            m_cursor_type = TriangleSelector::CursorType::SPHERE;
-
-        if (ImGui::IsItemHovered())
-            m_imgui->tooltip(_L("Paints all facets inside, regardless of their orientation."), max_tooltip_width);
-
-        ImGui::SameLine(cursor_type_offset + cursor_type_radio_sphere);
-        ImGui::PushItemWidth(cursor_type_radio_circle);
-
-        if (m_imgui->radio_button(m_desc["circle"], m_cursor_type == TriangleSelector::CursorType::CIRCLE))
-            m_cursor_type = TriangleSelector::CursorType::CIRCLE;
-
-        if (ImGui::IsItemHovered())
-            m_imgui->tooltip(_L("Ignores facets facing away from the camera."), max_tooltip_width);
-
-        ImGui::SameLine(cursor_type_offset + cursor_type_radio_sphere + cursor_type_radio_circle);
-        ImGui::PushItemWidth(cursor_type_radio_pointer);
-
-        if (m_imgui->radio_button(m_desc["pointer"], m_cursor_type == TriangleSelector::CursorType::POINTER))
-            m_cursor_type = TriangleSelector::CursorType::POINTER;
-
-        if (ImGui::IsItemHovered())
-            m_imgui->tooltip(_L("Paints only one facet."), max_tooltip_width);
-
-        m_imgui->disabled_begin(m_cursor_type != TriangleSelector::CursorType::SPHERE && m_cursor_type != TriangleSelector::CursorType::CIRCLE);
-
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("cursor_size"));
-        ImGui::SameLine(sliders_left_width);
-        ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);
-        m_imgui->slider_float("##cursor_radius", &m_cursor_radius, CursorRadiusMin, CursorRadiusMax, "%.2f", 1.0f, true, _L("Alt + Mouse wheel"));
-
-        m_imgui->checkbox(m_desc["split_triangles"], m_triangle_splitting_enabled);
-
-        if (ImGui::IsItemHovered())
-            m_imgui->tooltip(_L("Splits bigger facets into smaller ones while the object is painted."), max_tooltip_width);
-
-        m_imgui->disabled_end();
-    } else {
-        assert(m_tool_type == ToolType::SMART_FILL);
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc["smart_fill_angle"] + ":");
-
-        ImGui::SameLine(sliders_left_width);
-        ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);
-        if (m_imgui->slider_float("##smart_fill_angle", &m_smart_fill_angle, SmartFillAngleMin, SmartFillAngleMax, format_str.data(), 1.0f, true, _L("Alt + Mouse wheel")))
-            for (auto &triangle_selector : m_triangle_selectors) {
-                triangle_selector->seed_fill_unselect_all_triangles();
-                triangle_selector->request_update_render_data();
-            }
-    }
-
-    ImGui::Separator();
-    if (m_c->object_clipper()->get_position() == 0.f) {
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("clipping_of_view"));
-    }
-    else {
-        if (m_imgui->button(m_desc.at("reset_direction"))) {
-            wxGetApp().CallAfter([this](){
-                    m_c->object_clipper()->set_position(-1., false);
-                });
-        }
-    }
-
-    auto clp_dist = float(m_c->object_clipper()->get_position());
-    ImGui::SameLine(sliders_left_width);
-    ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);
-    if (m_imgui->slider_float("##clp_dist", &clp_dist, 0.f, 1.f, "%.2f", 1.0f, true, _L("Ctrl + Mouse wheel")))
-        m_c->object_clipper()->set_position(clp_dist, true);
-
-    ImGui::Separator();
-    if (m_imgui->button(m_desc.at("remove_all"))) {
-        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Reset selection"), UndoRedo::SnapshotType::GizmoAction);
-        ModelObject         *mo  = m_c->selection_info()->model_object();
-        int                  idx = -1;
-        for (ModelVolume *mv : mo->volumes)
-            if (mv->is_model_part()) {
-                ++idx;
-                m_triangle_selectors[idx]->reset();
-                m_triangle_selectors[idx]->request_update_render_data();
-            }
-
-        update_model_object();
-        m_parent.set_as_dirty();
-    }
-
-    m_imgui->end();
-}
-
-
-
-void GLGizmoFdmSupports::select_facets_by_angle(float threshold_deg, bool block)
-{
-    float threshold = (float(M_PI)/180.f)*threshold_deg;
-    const Selection& selection = m_parent.get_selection();
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    const ModelInstance* mi = mo->instances[selection.get_instance_idx()];
-
-    int mesh_id = -1;
-    for (const ModelVolume* mv : mo->volumes) {
-        if (! mv->is_model_part())
-            continue;
-
-        ++mesh_id;
-
-        const Transform3d trafo_matrix = mi->get_matrix(true) * mv->get_matrix(true);
-        Vec3f down  = (trafo_matrix.inverse() * (-Vec3d::UnitZ())).cast<float>().normalized();
-        Vec3f limit = (trafo_matrix.inverse() * Vec3d(std::sin(threshold), 0, -std::cos(threshold))).cast<float>().normalized();
-
-        float dot_limit = limit.dot(down);
-
-        // Now calculate dot product of vert_direction and facets' normals.
-        int idx = 0;
-        const indexed_triangle_set &its = mv->mesh().its;
-        for (const stl_triangle_vertex_indices &face : its.indices) {
-            if (its_face_normal(its, face).dot(down) > dot_limit) {
-                m_triangle_selectors[mesh_id]->set_facet(idx, block ? EnforcerBlockerType::BLOCKER : EnforcerBlockerType::ENFORCER);
-                m_triangle_selectors.back()->request_update_render_data();
-            }
-            ++ idx;
-        }
-    }
-
-    Plater::TakeSnapshot snapshot(wxGetApp().plater(), block ? _L("Block supports by angle")
-                                                    : _L("Add supports by angle"));
-    update_model_object();
-    m_parent.set_as_dirty();
-}
-
-
-
-void GLGizmoFdmSupports::update_model_object() const
-{
-    bool updated = false;
-    ModelObject* mo = m_c->selection_info()->model_object();
-    int idx = -1;
-    for (ModelVolume* mv : mo->volumes) {
-        if (! mv->is_model_part())
-            continue;
-        ++idx;
-        updated |= mv->supported_facets.set(*m_triangle_selectors[idx].get());
-    }
-
-    if (updated) {
-        const ModelObjectPtrs& mos = wxGetApp().model().objects;
-        wxGetApp().obj_list()->update_info_items(std::find(mos.begin(), mos.end(), mo) - mos.begin());
-
-        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
-    }
-}
-
-
-
-void GLGizmoFdmSupports::update_from_model_object()
-{
-    wxBusyCursor wait;
-
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    m_triangle_selectors.clear();
-
-    int volume_id = -1;
-    for (const ModelVolume* mv : mo->volumes) {
-        if (! mv->is_model_part())
-            continue;
-
-        ++volume_id;
-
-        // This mesh does not account for the possible Z up SLA offset.
-        const TriangleMesh* mesh = &mv->mesh();
-
-        m_triangle_selectors.emplace_back(std::make_unique<TriangleSelectorGUI>(*mesh));
-        // Reset of TriangleSelector is done inside TriangleSelectorGUI's constructor, so we don't need it to perform it again in deserialize().
-        m_triangle_selectors.back()->deserialize(mv->supported_facets.get_data(), false);
-        m_triangle_selectors.back()->request_update_render_data();
-    }
-}
-
-
-
-PainterGizmoType GLGizmoFdmSupports::get_painter_type() const
-{
-    return PainterGizmoType::FDM_SUPPORTS;
-}
-
-wxString GLGizmoFdmSupports::handle_snapshot_action_name(bool shift_down, GLGizmoPainterBase::Button button_down) const
-{
-    wxString action_name;
-    if (shift_down)
-        action_name = _L("Remove selection");
-    else {
-        if (button_down == Button::Left)
-            action_name = _L("Add supports");
-        else
-            action_name = _L("Block supports");
-    }
-    return action_name;
-}
-
-} // namespace Slic3r::GUI
+#include "GLGizmoFdmSupports.hpp"

+

+#include "libslic3r/Model.hpp"

+

+//#include "slic3r/GUI/3DScene.hpp"

+#include "slic3r/GUI/GLCanvas3D.hpp"

+#include "slic3r/GUI/GUI_App.hpp"

+#include "slic3r/GUI/ImGuiWrapper.hpp"

+#include "slic3r/GUI/Plater.hpp"

+#include "slic3r/GUI/GUI_ObjectList.hpp"

+#include "slic3r/GUI/format.hpp"

+#include "slic3r/Utils/UndoRedo.hpp"

+

+

+#include <GL/glew.h>

+

+

+namespace Slic3r::GUI {

+

+

+

+void GLGizmoFdmSupports::on_shutdown()

+{

+    m_highlight_by_angle_threshold_deg = 0.f;

+    m_parent.use_slope(false);

+    m_parent.toggle_model_objects_visibility(true);

+}

+

+

+

+std::string GLGizmoFdmSupports::on_get_name() const

+{

+    return _u8L("Paint-on supports");

+}

+

+

+

+bool GLGizmoFdmSupports::on_init()

+{

+    m_shortcut_key = WXK_CONTROL_L;

+

+    m_desc["clipping_of_view"] = _L("Clipping of view") + ": ";

+    m_desc["reset_direction"]  = _L("Reset direction");

+    m_desc["cursor_size"]      = _L("Brush size") + ": ";

+    m_desc["cursor_type"]      = _L("Brush shape") + ": ";

+    m_desc["enforce_caption"]  = _L("Left mouse button") + ": ";

+    m_desc["enforce"]          = _L("Enforce supports");

+    m_desc["block_caption"]    = _L("Right mouse button") + ": ";

+    m_desc["block"]            = _L("Block supports");

+    m_desc["remove_caption"]   = _L("Shift + Left mouse button") + ": ";

+    m_desc["remove"]           = _L("Remove selection");

+    m_desc["remove_all"]       = _L("Remove all selection");

+    m_desc["circle"]           = _L("Circle");

+    m_desc["sphere"]           = _L("Sphere");

+    m_desc["pointer"]          = _L("Triangles");

+    m_desc["highlight_by_angle"] = _L("Highlight overhang by angle");

+    m_desc["enforce_button"]   = _L("Enforce");

+    m_desc["cancel"]           = _L("Cancel");

+

+    m_desc["tool_type"]        = _L("Tool type") + ": ";

+    m_desc["tool_brush"]       = _L("Brush");

+    m_desc["tool_smart_fill"]  = _L("Smart fill");

+

+    m_desc["smart_fill_angle"] = _L("Smart fill angle");

+

+    m_desc["split_triangles"]   = _L("Split triangles");

+    m_desc["on_overhangs_only"] = _L("On overhangs only");

+

+    return true;

+}

+

+void GLGizmoFdmSupports::render_painter_gizmo()

+{

+    const Selection& selection = m_parent.get_selection();

+

+    glsafe(::glEnable(GL_BLEND));

+    glsafe(::glEnable(GL_DEPTH_TEST));

+

+    render_triangles(selection);

+    m_c->object_clipper()->render_cut();

+    m_c->instances_hider()->render_cut();

+    render_cursor();

+

+    glsafe(::glDisable(GL_BLEND));

+}

+

+

+

+void GLGizmoFdmSupports::on_render_input_window(float x, float y, float bottom_limit)

+{

+    if (! m_c->selection_info()->model_object())

+        return;

+

+    const float approx_height = m_imgui->scaled(23.f);

+    y = std::min(y, bottom_limit - approx_height);

+    m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);

+

+    m_imgui->begin(get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);

+

+    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:

+    const float clipping_slider_left           = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x,

+                                                          m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(1.5f);

+    const float cursor_slider_left             = m_imgui->calc_text_size(m_desc.at("cursor_size")).x + m_imgui->scaled(1.f);

+    const float smart_fill_slider_left         = m_imgui->calc_text_size(m_desc.at("smart_fill_angle")).x + m_imgui->scaled(1.f);

+    const float autoset_slider_label_max_width = m_imgui->scaled(7.5f);

+    const float autoset_slider_left            = m_imgui->calc_text_size(m_desc.at("highlight_by_angle"), autoset_slider_label_max_width).x + m_imgui->scaled(1.f);

+

+    const float cursor_type_radio_circle  = m_imgui->calc_text_size(m_desc["circle"]).x + m_imgui->scaled(2.5f);

+    const float cursor_type_radio_sphere  = m_imgui->calc_text_size(m_desc["sphere"]).x + m_imgui->scaled(2.5f);

+    const float cursor_type_radio_pointer = m_imgui->calc_text_size(m_desc["pointer"]).x + m_imgui->scaled(2.5f);

+

+    const float button_width = m_imgui->calc_text_size(m_desc.at("remove_all")).x + m_imgui->scaled(1.f);

+    const float button_enforce_width = m_imgui->calc_text_size(m_desc.at("enforce_button")).x;

+    const float button_cancel_width = m_imgui->calc_text_size(m_desc.at("cancel")).x;

+    const float buttons_width = std::max(button_enforce_width, button_cancel_width) + m_imgui->scaled(0.5f);

+    const float minimal_slider_width = m_imgui->scaled(4.f);

+

+    const float tool_type_radio_left       = m_imgui->calc_text_size(m_desc["tool_type"]).x + m_imgui->scaled(1.f);

+    const float tool_type_radio_brush      = m_imgui->calc_text_size(m_desc["tool_brush"]).x + m_imgui->scaled(2.5f);

+    const float tool_type_radio_smart_fill = m_imgui->calc_text_size(m_desc["tool_smart_fill"]).x + m_imgui->scaled(2.5f);

+

+    const float split_triangles_checkbox_width   = m_imgui->calc_text_size(m_desc["split_triangles"]).x + m_imgui->scaled(2.5f);

+    const float on_overhangs_only_checkbox_width = m_imgui->calc_text_size(m_desc["on_overhangs_only"]).x + m_imgui->scaled(2.5f);

+

+    float caption_max    = 0.f;

+    float total_text_max = 0.f;

+    for (const auto &t : std::array<std::string, 3>{"enforce", "block", "remove"}) {

+        caption_max    = std::max(caption_max, m_imgui->calc_text_size(m_desc[t + "_caption"]).x);

+        total_text_max = std::max(total_text_max, m_imgui->calc_text_size(m_desc[t]).x);

+    }

+    total_text_max += caption_max + m_imgui->scaled(1.f);

+    caption_max    += m_imgui->scaled(1.f);

+

+    const float sliders_left_width = std::max(std::max(autoset_slider_left, smart_fill_slider_left), std::max(cursor_slider_left, clipping_slider_left));

+    const float slider_icon_width  = m_imgui->get_slider_icon_size().x;

+    float       window_width       = minimal_slider_width + sliders_left_width + slider_icon_width;

+    window_width = std::max(window_width, total_text_max);

+    window_width = std::max(window_width, button_width);

+    window_width = std::max(window_width, split_triangles_checkbox_width);

+    window_width = std::max(window_width, on_overhangs_only_checkbox_width);

+    window_width = std::max(window_width, cursor_type_radio_circle + cursor_type_radio_sphere + cursor_type_radio_pointer);

+    window_width = std::max(window_width, tool_type_radio_left + tool_type_radio_brush + tool_type_radio_smart_fill);

+    window_width = std::max(window_width, 2.f * buttons_width + m_imgui->scaled(1.f));

+

+    auto draw_text_with_caption = [this, &caption_max](const wxString& caption, const wxString& text) {

+        m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, caption);

+        ImGui::SameLine(caption_max);

+        m_imgui->text(text);

+    };

+

+    for (const auto &t : std::array<std::string, 3>{"enforce", "block", "remove"})

+        draw_text_with_caption(m_desc.at(t + "_caption"), m_desc.at(t));

+

+    ImGui::Separator();

+

+    float position_before_text_y = ImGui::GetCursorPos().y;

+    ImGui::AlignTextToFramePadding();

+    m_imgui->text_wrapped(m_desc["highlight_by_angle"] + ":", autoset_slider_label_max_width);

+    ImGui::AlignTextToFramePadding();

+    float position_after_text_y  = ImGui::GetCursorPos().y;

+    std::string format_str = std::string("%.f") + I18N::translate_utf8("°",

+        "Degree sign to use in the respective slider in FDM supports gizmo,"

+        "placed after the number with no whitespace in between.");

+    ImGui::SameLine(sliders_left_width);

+

+    float slider_height = m_imgui->get_slider_float_height();

+    // Makes slider to be aligned to bottom of the multi-line text.

+    float slider_start_position_y = std::max(position_before_text_y, position_after_text_y - slider_height);

+    ImGui::SetCursorPosY(slider_start_position_y);

+

+    ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);

+    wxString tooltip = format_wxstr(_L("Preselects faces by overhang angle. It is possible to restrict paintable facets to only preselected faces when "

+            "the option \"%1%\" is enabled."), m_desc["on_overhangs_only"]);

+    if (m_imgui->slider_float("##angle_threshold_deg", &m_highlight_by_angle_threshold_deg, 0.f, 90.f, format_str.data(), 1.0f, true, tooltip)) {

+        m_parent.set_slope_normal_angle(90.f - m_highlight_by_angle_threshold_deg);

+        if (! m_parent.is_using_slope()) {

+            m_parent.use_slope(true);

+            m_parent.set_as_dirty();

+        }

+    }

+

+    // Restores the cursor position to be below the multi-line text.

+    ImGui::SetCursorPosY(std::max(position_before_text_y + slider_height, position_after_text_y));

+

+    const float max_tooltip_width = ImGui::GetFontSize() * 20.0f;

+

+    m_imgui->disabled_begin(m_highlight_by_angle_threshold_deg == 0.f);

+    ImGui::NewLine();

+    ImGui::SameLine(window_width - 2.f*buttons_width - m_imgui->scaled(0.5f));

+    if (m_imgui->button(m_desc["enforce_button"], buttons_width, 0.f)) {

+        select_facets_by_angle(m_highlight_by_angle_threshold_deg, false);

+        m_highlight_by_angle_threshold_deg = 0.f;

+        m_parent.use_slope(false);

+    }

+    ImGui::SameLine(window_width - buttons_width);

+    if (m_imgui->button(m_desc["cancel"], buttons_width, 0.f)) {

+        m_highlight_by_angle_threshold_deg = 0.f;

+        m_parent.use_slope(false);

+    }

+    m_imgui->disabled_end();

+

+

+    ImGui::Separator();

+

+    ImGui::AlignTextToFramePadding();

+    m_imgui->text(m_desc["tool_type"]);

+

+    float tool_type_offset = tool_type_radio_left + (window_width - tool_type_radio_left - tool_type_radio_brush - tool_type_radio_smart_fill + m_imgui->scaled(0.5f)) / 2.f;

+    ImGui::SameLine(tool_type_offset);

+    ImGui::PushItemWidth(tool_type_radio_brush);

+    if (m_imgui->radio_button(m_desc["tool_brush"], m_tool_type == ToolType::BRUSH))

+        m_tool_type = ToolType::BRUSH;

+

+    if (ImGui::IsItemHovered())

+        m_imgui->tooltip(_L("Paints facets according to the chosen painting brush."), max_tooltip_width);

+

+    ImGui::SameLine(tool_type_offset + tool_type_radio_brush);

+    ImGui::PushItemWidth(tool_type_radio_smart_fill);

+    if (m_imgui->radio_button(m_desc["tool_smart_fill"], m_tool_type == ToolType::SMART_FILL))

+        m_tool_type = ToolType::SMART_FILL;

+

+    if (ImGui::IsItemHovered())

+        m_imgui->tooltip(_L("Paints neighboring facets whose relative angle is less or equal to set angle."), max_tooltip_width);

+

+    m_imgui->checkbox(m_desc["on_overhangs_only"], m_paint_on_overhangs_only);

+    if (ImGui::IsItemHovered())

+        m_imgui->tooltip(format_wxstr(_L("Allows painting only on facets selected by: \"%1%\""), m_desc["highlight_by_angle"]), max_tooltip_width);

+

+    ImGui::Separator();

+

+    if (m_tool_type == ToolType::BRUSH) {

+        m_imgui->text(m_desc.at("cursor_type"));

+        ImGui::NewLine();

+

+        float cursor_type_offset = (window_width - cursor_type_radio_sphere - cursor_type_radio_circle - cursor_type_radio_pointer + m_imgui->scaled(1.5f)) / 2.f;

+        ImGui::SameLine(cursor_type_offset);

+        ImGui::PushItemWidth(cursor_type_radio_sphere);

+        if (m_imgui->radio_button(m_desc["sphere"], m_cursor_type == TriangleSelector::CursorType::SPHERE))

+            m_cursor_type = TriangleSelector::CursorType::SPHERE;

+

+        if (ImGui::IsItemHovered())

+            m_imgui->tooltip(_L("Paints all facets inside, regardless of their orientation."), max_tooltip_width);

+

+        ImGui::SameLine(cursor_type_offset + cursor_type_radio_sphere);

+        ImGui::PushItemWidth(cursor_type_radio_circle);

+

+        if (m_imgui->radio_button(m_desc["circle"], m_cursor_type == TriangleSelector::CursorType::CIRCLE))

+            m_cursor_type = TriangleSelector::CursorType::CIRCLE;

+

+        if (ImGui::IsItemHovered())

+            m_imgui->tooltip(_L("Ignores facets facing away from the camera."), max_tooltip_width);

+

+        ImGui::SameLine(cursor_type_offset + cursor_type_radio_sphere + cursor_type_radio_circle);

+        ImGui::PushItemWidth(cursor_type_radio_pointer);

+

+        if (m_imgui->radio_button(m_desc["pointer"], m_cursor_type == TriangleSelector::CursorType::POINTER))

+            m_cursor_type = TriangleSelector::CursorType::POINTER;

+

+        if (ImGui::IsItemHovered())

+            m_imgui->tooltip(_L("Paints only one facet."), max_tooltip_width);

+

+        m_imgui->disabled_begin(m_cursor_type != TriangleSelector::CursorType::SPHERE && m_cursor_type != TriangleSelector::CursorType::CIRCLE);

+

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("cursor_size"));

+        ImGui::SameLine(sliders_left_width);

+        ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);

+        m_imgui->slider_float("##cursor_radius", &m_cursor_radius, CursorRadiusMin, CursorRadiusMax, "%.2f", 1.0f, true, _L("Alt + Mouse wheel"));

+

+        m_imgui->checkbox(m_desc["split_triangles"], m_triangle_splitting_enabled);

+

+        if (ImGui::IsItemHovered())

+            m_imgui->tooltip(_L("Splits bigger facets into smaller ones while the object is painted."), max_tooltip_width);

+

+        m_imgui->disabled_end();

+    } else {

+        assert(m_tool_type == ToolType::SMART_FILL);

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc["smart_fill_angle"] + ":");

+

+        ImGui::SameLine(sliders_left_width);

+        ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);

+        if (m_imgui->slider_float("##smart_fill_angle", &m_smart_fill_angle, SmartFillAngleMin, SmartFillAngleMax, format_str.data(), 1.0f, true, _L("Alt + Mouse wheel")))

+            for (auto &triangle_selector : m_triangle_selectors) {

+                triangle_selector->seed_fill_unselect_all_triangles();

+                triangle_selector->request_update_render_data();

+            }

+    }

+

+    ImGui::Separator();

+    if (m_c->object_clipper()->get_position() == 0.f) {

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("clipping_of_view"));

+    }

+    else {

+        if (m_imgui->button(m_desc.at("reset_direction"))) {

+            wxGetApp().CallAfter([this](){

+                    m_c->object_clipper()->set_position(-1., false);

+                });

+        }

+    }

+

+    auto clp_dist = float(m_c->object_clipper()->get_position());

+    ImGui::SameLine(sliders_left_width);

+    ImGui::PushItemWidth(window_width - sliders_left_width - slider_icon_width);

+    if (m_imgui->slider_float("##clp_dist", &clp_dist, 0.f, 1.f, "%.2f", 1.0f, true, _L("Ctrl + Mouse wheel")))

+        m_c->object_clipper()->set_position(clp_dist, true);

+

+    ImGui::Separator();

+    if (m_imgui->button(m_desc.at("remove_all"))) {

+        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Reset selection"), UndoRedo::SnapshotType::GizmoAction);

+        ModelObject         *mo  = m_c->selection_info()->model_object();

+        int                  idx = -1;

+        for (ModelVolume *mv : mo->volumes)

+            if (mv->is_model_part()) {

+                ++idx;

+                m_triangle_selectors[idx]->reset();

+                m_triangle_selectors[idx]->request_update_render_data();

+            }

+

+        update_model_object();

+        m_parent.set_as_dirty();

+    }

+

+    m_imgui->end();

+}

+

+

+

+void GLGizmoFdmSupports::select_facets_by_angle(float threshold_deg, bool block)

+{

+    float threshold = (float(M_PI)/180.f)*threshold_deg;

+    const Selection& selection = m_parent.get_selection();

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    const ModelInstance* mi = mo->instances[selection.get_instance_idx()];

+

+    int mesh_id = -1;

+    for (const ModelVolume* mv : mo->volumes) {

+        if (! mv->is_model_part())

+            continue;

+

+        ++mesh_id;

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        const Transform3d trafo_matrix = mi->get_matrix_no_offset() * mv->get_matrix_no_offset();

+#else

+        const Transform3d trafo_matrix = mi->get_matrix(true) * mv->get_matrix(true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+        Vec3f down  = (trafo_matrix.inverse() * (-Vec3d::UnitZ())).cast<float>().normalized();

+        Vec3f limit = (trafo_matrix.inverse() * Vec3d(std::sin(threshold), 0, -std::cos(threshold))).cast<float>().normalized();

+

+        float dot_limit = limit.dot(down);

+

+        // Now calculate dot product of vert_direction and facets' normals.

+        int idx = 0;

+        const indexed_triangle_set &its = mv->mesh().its;

+        for (const stl_triangle_vertex_indices &face : its.indices) {

+            if (its_face_normal(its, face).dot(down) > dot_limit) {

+                m_triangle_selectors[mesh_id]->set_facet(idx, block ? EnforcerBlockerType::BLOCKER : EnforcerBlockerType::ENFORCER);

+                m_triangle_selectors.back()->request_update_render_data();

+            }

+            ++ idx;

+        }

+    }

+

+    Plater::TakeSnapshot snapshot(wxGetApp().plater(), block ? _L("Block supports by angle")

+                                                    : _L("Add supports by angle"));

+    update_model_object();

+    m_parent.set_as_dirty();

+}

+

+

+

+void GLGizmoFdmSupports::update_model_object() const

+{

+    bool updated = false;

+    ModelObject* mo = m_c->selection_info()->model_object();

+    int idx = -1;

+    for (ModelVolume* mv : mo->volumes) {

+        if (! mv->is_model_part())

+            continue;

+        ++idx;

+        updated |= mv->supported_facets.set(*m_triangle_selectors[idx].get());

+    }

+

+    if (updated) {

+        const ModelObjectPtrs& mos = wxGetApp().model().objects;

+        wxGetApp().obj_list()->update_info_items(std::find(mos.begin(), mos.end(), mo) - mos.begin());

+

+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));

+    }

+}

+

+

+

+void GLGizmoFdmSupports::update_from_model_object()

+{

+    wxBusyCursor wait;

+

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    m_triangle_selectors.clear();

+

+    int volume_id = -1;

+    for (const ModelVolume* mv : mo->volumes) {

+        if (! mv->is_model_part())

+            continue;

+

+        ++volume_id;

+

+        // This mesh does not account for the possible Z up SLA offset.

+        const TriangleMesh* mesh = &mv->mesh();

+

+        m_triangle_selectors.emplace_back(std::make_unique<TriangleSelectorGUI>(*mesh));

+        // Reset of TriangleSelector is done inside TriangleSelectorGUI's constructor, so we don't need it to perform it again in deserialize().

+        m_triangle_selectors.back()->deserialize(mv->supported_facets.get_data(), false);

+        m_triangle_selectors.back()->request_update_render_data();

+    }

+}

+

+

+

+PainterGizmoType GLGizmoFdmSupports::get_painter_type() const

+{

+    return PainterGizmoType::FDM_SUPPORTS;

+}

+

+wxString GLGizmoFdmSupports::handle_snapshot_action_name(bool shift_down, GLGizmoPainterBase::Button button_down) const

+{

+    wxString action_name;

+    if (shift_down)

+        action_name = _L("Remove selection");

+    else {

+        if (button_down == Button::Left)

+            action_name = _L("Add supports");

+        else

+            action_name = _L("Block supports");

+    }

+    return action_name;

+}

+

+} // namespace Slic3r::GUI

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
index aa291f623..b882570fc 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
@@ -1,475 +1,479 @@
-// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.
-#include "GLGizmoFlatten.hpp"
-#include "slic3r/GUI/GLCanvas3D.hpp"
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-#include "slic3r/GUI/GUI_App.hpp"
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-#include "slic3r/GUI/Plater.hpp"
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"
-
-#include "libslic3r/Geometry/ConvexHull.hpp"
-#include "libslic3r/Model.hpp"
-
-#include <numeric>
-
-#include <GL/glew.h>
-
-namespace Slic3r {
-namespace GUI {
-
-static const Slic3r::ColorRGBA DEFAULT_PLANE_COLOR       = { 0.9f, 0.9f, 0.9f, 0.5f };
-static const Slic3r::ColorRGBA DEFAULT_HOVER_PLANE_COLOR = { 0.9f, 0.9f, 0.9f, 0.75f };
-
-GLGizmoFlatten::GLGizmoFlatten(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
-    : GLGizmoBase(parent, icon_filename, sprite_id)
-{}
-
-bool GLGizmoFlatten::on_mouse(const wxMouseEvent &mouse_event)
-{
-    if (mouse_event.Moving()) {
-        // only for sure 
-        m_mouse_left_down = false;
-        return false;
-    }
-    if (mouse_event.LeftDown()) {
-        if (m_hover_id != -1) {
-            m_mouse_left_down = true;
-            Selection &selection = m_parent.get_selection();
-            if (selection.is_single_full_instance()) {
-                // Rotate the object so the normal points downward:
-                selection.flattening_rotate(m_planes[m_hover_id].normal);
-                m_parent.do_rotate(L("Gizmo-Place on Face"));
-            }
-            return true;
-        }
-
-        // fix: prevent restart gizmo when reselect object
-        // take responsibility for left up
-        if (m_parent.get_first_hover_volume_idx() >= 0) m_mouse_left_down = true;
-        
-    } else if (mouse_event.LeftUp()) {
-        if (m_mouse_left_down) {
-            // responsible for mouse left up after selecting plane
-            m_mouse_left_down = false;
-            return true;
-        }
-    } else if (mouse_event.Leaving()) {
-        m_mouse_left_down = false;
-    }
-    return false;
-}
-
-void GLGizmoFlatten::data_changed()
-{
-    const Selection &  selection    = m_parent.get_selection();
-    const ModelObject *model_object = nullptr;
-    if (selection.is_single_full_instance() ||
-        selection.is_from_single_object() ) {        
-        model_object = selection.get_model()->objects[selection.get_object_idx()];
-    }    
-    set_flattening_data(model_object);
-}
-
-bool GLGizmoFlatten::on_init()
-{
-    m_shortcut_key = WXK_CONTROL_F;
-    return true;
-}
-
-void GLGizmoFlatten::on_set_state()
-{
-}
-
-CommonGizmosDataID GLGizmoFlatten::on_get_requirements() const
-{
-    return CommonGizmosDataID::SelectionInfo;
-}
-
-std::string GLGizmoFlatten::on_get_name() const
-{
-    return _u8L("Place on face");
-}
-
-bool GLGizmoFlatten::on_is_activable() const
-{
-    // This is assumed in GLCanvas3D::do_rotate, do not change this
-    // without updating that function too.
-    return m_parent.get_selection().is_single_full_instance();
-}
-
-void GLGizmoFlatten::on_render()
-{
-    const Selection& selection = m_parent.get_selection();
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLShaderProgram* shader = wxGetApp().get_shader("flat");
-    if (shader == nullptr)
-        return;
-    
-    shader->start_using();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    glsafe(::glClear(GL_DEPTH_BUFFER_BIT));
-
-    glsafe(::glEnable(GL_DEPTH_TEST));
-    glsafe(::glEnable(GL_BLEND));
-
-    if (selection.is_single_full_instance()) {
-        const Transform3d& m = selection.get_volume(*selection.get_volume_idxs().begin())->get_instance_transformation().get_matrix();
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Camera& camera = wxGetApp().plater()->get_camera();
-        const Transform3d view_model_matrix = camera.get_view_matrix() *
-            Geometry::assemble_transform(selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z() * Vec3d::UnitZ()) * m;
-
-        shader->set_uniform("view_model_matrix", view_model_matrix);
-        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-#else
-        glsafe(::glPushMatrix());
-        glsafe(::glTranslatef(0.f, 0.f, selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z()));
-        glsafe(::glMultMatrixd(m.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        if (this->is_plane_update_necessary())
-            update_planes();
-        for (int i = 0; i < (int)m_planes.size(); ++i) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-            m_planes[i].vbo.set_color(i == m_hover_id ? DEFAULT_HOVER_PLANE_COLOR : DEFAULT_PLANE_COLOR);
-            m_planes[i].vbo.render();
-#else
-            glsafe(::glColor4fv(i == m_hover_id ? DEFAULT_HOVER_PLANE_COLOR.data() : DEFAULT_PLANE_COLOR.data()));
-            if (m_planes[i].vbo.has_VBOs())
-                m_planes[i].vbo.render();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        }
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-        glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-    }
-
-    glsafe(::glEnable(GL_CULL_FACE));
-    glsafe(::glDisable(GL_BLEND));
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    shader->stop_using();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-}
-
-void GLGizmoFlatten::on_render_for_picking()
-{
-    const Selection& selection = m_parent.get_selection();
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLShaderProgram* shader = wxGetApp().get_shader("flat");
-    if (shader == nullptr)
-        return;
-
-    shader->start_using();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    glsafe(::glDisable(GL_DEPTH_TEST));
-    glsafe(::glDisable(GL_BLEND));
-
-    if (selection.is_single_full_instance() && !wxGetKeyState(WXK_CONTROL)) {
-        const Transform3d& m = selection.get_volume(*selection.get_volume_idxs().begin())->get_instance_transformation().get_matrix();
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Camera& camera = wxGetApp().plater()->get_camera();
-        const Transform3d view_model_matrix = camera.get_view_matrix() *
-            Geometry::assemble_transform(selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z() * Vec3d::UnitZ()) * m;
-
-        shader->set_uniform("view_model_matrix", view_model_matrix);
-        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-#else
-        glsafe(::glPushMatrix());
-        glsafe(::glTranslatef(0.f, 0.f, selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z()));
-        glsafe(::glMultMatrixd(m.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        if (this->is_plane_update_necessary())
-            update_planes();
-        for (int i = 0; i < (int)m_planes.size(); ++i) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-            m_planes[i].vbo.set_color(picking_color_component(i));
-#else
-            glsafe(::glColor4fv(picking_color_component(i).data()));
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-            m_planes[i].vbo.render();
-        }
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-        glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-    }
-
-    glsafe(::glEnable(GL_CULL_FACE));
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    shader->stop_using();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-}
-
-void GLGizmoFlatten::set_flattening_data(const ModelObject* model_object)
-{
-    if (model_object != m_old_model_object) {
-        m_planes.clear();
-        m_planes_valid = false;
-    }
-}
-
-void GLGizmoFlatten::update_planes()
-{
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    TriangleMesh ch;
-    for (const ModelVolume* vol : mo->volumes) {
-        if (vol->type() != ModelVolumeType::MODEL_PART)
-            continue;
-        TriangleMesh vol_ch = vol->get_convex_hull();
-        vol_ch.transform(vol->get_matrix());
-        ch.merge(vol_ch);
-    }
-    ch = ch.convex_hull_3d();
-    m_planes.clear();
-    const Transform3d& inst_matrix = mo->instances.front()->get_matrix(true);
-
-    // Following constants are used for discarding too small polygons.
-    const float minimal_area = 5.f; // in square mm (world coordinates)
-    const float minimal_side = 1.f; // mm
-
-    // Now we'll go through all the facets and append Points of facets sharing the same normal.
-    // This part is still performed in mesh coordinate system.
-    const int                num_of_facets  = ch.facets_count();
-    const std::vector<Vec3f> face_normals   = its_face_normals(ch.its);
-    const std::vector<Vec3i> face_neighbors = its_face_neighbors(ch.its);
-    std::vector<int>         facet_queue(num_of_facets, 0);
-    std::vector<bool>        facet_visited(num_of_facets, false);
-    int                      facet_queue_cnt = 0;
-    const stl_normal*        normal_ptr      = nullptr;
-    int facet_idx = 0;
-    while (1) {
-        // Find next unvisited triangle:
-        for (; facet_idx < num_of_facets; ++ facet_idx)
-            if (!facet_visited[facet_idx]) {
-                facet_queue[facet_queue_cnt ++] = facet_idx;
-                facet_visited[facet_idx] = true;
-                normal_ptr = &face_normals[facet_idx];
-                m_planes.emplace_back();
-                break;
-            }
-        if (facet_idx == num_of_facets)
-            break; // Everything was visited already
-
-        while (facet_queue_cnt > 0) {
-            int facet_idx = facet_queue[-- facet_queue_cnt];
-            const stl_normal& this_normal = face_normals[facet_idx];
-            if (std::abs(this_normal(0) - (*normal_ptr)(0)) < 0.001 && std::abs(this_normal(1) - (*normal_ptr)(1)) < 0.001 && std::abs(this_normal(2) - (*normal_ptr)(2)) < 0.001) {
-                const Vec3i face = ch.its.indices[facet_idx];
-                for (int j=0; j<3; ++j)
-                    m_planes.back().vertices.emplace_back(ch.its.vertices[face[j]].cast<double>());
-
-                facet_visited[facet_idx] = true;
-                for (int j = 0; j < 3; ++ j)
-                    if (int neighbor_idx = face_neighbors[facet_idx][j]; neighbor_idx >= 0 && ! facet_visited[neighbor_idx])
-                        facet_queue[facet_queue_cnt ++] = neighbor_idx;
-            }
-        }
-        m_planes.back().normal = normal_ptr->cast<double>();
-
-        Pointf3s& verts = m_planes.back().vertices;
-        // Now we'll transform all the points into world coordinates, so that the areas, angles and distances
-        // make real sense.
-        verts = transform(verts, inst_matrix);
-
-        // if this is a just a very small triangle, remove it to speed up further calculations (it would be rejected later anyway):
-        if (verts.size() == 3 &&
-            ((verts[0] - verts[1]).norm() < minimal_side
-            || (verts[0] - verts[2]).norm() < minimal_side
-            || (verts[1] - verts[2]).norm() < minimal_side))
-            m_planes.pop_back();
-    }
-
-    // Let's prepare transformation of the normal vector from mesh to instance coordinates.
-    Geometry::Transformation t(inst_matrix);
-    Vec3d scaling = t.get_scaling_factor();
-    t.set_scaling_factor(Vec3d(1./scaling(0), 1./scaling(1), 1./scaling(2)));
-
-    // Now we'll go through all the polygons, transform the points into xy plane to process them:
-    for (unsigned int polygon_id=0; polygon_id < m_planes.size(); ++polygon_id) {
-        Pointf3s& polygon = m_planes[polygon_id].vertices;
-        const Vec3d& normal = m_planes[polygon_id].normal;
-
-        // transform the normal according to the instance matrix:
-        Vec3d normal_transformed = t.get_matrix() * normal;
-
-        // We are going to rotate about z and y to flatten the plane
-        Eigen::Quaterniond q;
-        Transform3d m = Transform3d::Identity();
-        m.matrix().block(0, 0, 3, 3) = q.setFromTwoVectors(normal_transformed, Vec3d::UnitZ()).toRotationMatrix();
-        polygon = transform(polygon, m);
-
-        // Now to remove the inner points. We'll misuse Geometry::convex_hull for that, but since
-        // it works in fixed point representation, we will rescale the polygon to avoid overflows.
-        // And yes, it is a nasty thing to do. Whoever has time is free to refactor.
-        Vec3d bb_size = BoundingBoxf3(polygon).size();
-        float sf = std::min(1./bb_size(0), 1./bb_size(1));
-        Transform3d tr = Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), Vec3d(sf, sf, 1.f));
-        polygon = transform(polygon, tr);
-        polygon = Slic3r::Geometry::convex_hull(polygon);
-        polygon = transform(polygon, tr.inverse());
-
-        // Calculate area of the polygons and discard ones that are too small
-        float& area = m_planes[polygon_id].area;
-        area = 0.f;
-        for (unsigned int i = 0; i < polygon.size(); i++) // Shoelace formula
-            area += polygon[i](0)*polygon[i + 1 < polygon.size() ? i + 1 : 0](1) - polygon[i + 1 < polygon.size() ? i + 1 : 0](0)*polygon[i](1);
-        area = 0.5f * std::abs(area);
-
-        bool discard = false;
-        if (area < minimal_area)
-            discard = true;
-        else {
-            // We also check the inner angles and discard polygons with angles smaller than the following threshold
-            const double angle_threshold = ::cos(10.0 * (double)PI / 180.0);
-
-            for (unsigned int i = 0; i < polygon.size(); ++i) {
-                const Vec3d& prec = polygon[(i == 0) ? polygon.size() - 1 : i - 1];
-                const Vec3d& curr = polygon[i];
-                const Vec3d& next = polygon[(i == polygon.size() - 1) ? 0 : i + 1];
-
-                if ((prec - curr).normalized().dot((next - curr).normalized()) > angle_threshold) {
-                    discard = true;
-                    break;
-                }
-            }
-        }
-
-        if (discard) {
-            m_planes[polygon_id--] = std::move(m_planes.back());
-            m_planes.pop_back();
-            continue;
-        }
-
-        // We will shrink the polygon a little bit so it does not touch the object edges:
-        Vec3d centroid = std::accumulate(polygon.begin(), polygon.end(), Vec3d(0.0, 0.0, 0.0));
-        centroid /= (double)polygon.size();
-        for (auto& vertex : polygon)
-            vertex = 0.9f*vertex + 0.1f*centroid;
-
-        // Polygon is now simple and convex, we'll round the corners to make them look nicer.
-        // The algorithm takes a vertex, calculates middles of respective sides and moves the vertex
-        // towards their average (controlled by 'aggressivity'). This is repeated k times.
-        // In next iterations, the neighbours are not always taken at the middle (to increase the
-        // rounding effect at the corners, where we need it most).
-        const unsigned int k = 10; // number of iterations
-        const float aggressivity = 0.2f;  // agressivity
-        const unsigned int N = polygon.size();
-        std::vector<std::pair<unsigned int, unsigned int>> neighbours;
-        if (k != 0) {
-            Pointf3s points_out(2*k*N); // vector long enough to store the future vertices
-            for (unsigned int j=0; j<N; ++j) {
-                points_out[j*2*k] = polygon[j];
-                neighbours.push_back(std::make_pair((int)(j*2*k-k) < 0 ? (N-1)*2*k+k : j*2*k-k, j*2*k+k));
-            }
-
-            for (unsigned int i=0; i<k; ++i) {
-                // Calculate middle of each edge so that neighbours points to something useful:
-                for (unsigned int j=0; j<N; ++j)
-                    if (i==0)
-                        points_out[j*2*k+k] = 0.5f * (points_out[j*2*k] + points_out[j==N-1 ? 0 : (j+1)*2*k]);
-                    else {
-                        float r = 0.2+0.3/(k-1)*i; // the neighbours are not always taken in the middle
-                        points_out[neighbours[j].first] = r*points_out[j*2*k] + (1-r) * points_out[neighbours[j].first-1];
-                        points_out[neighbours[j].second] = r*points_out[j*2*k] + (1-r) * points_out[neighbours[j].second+1];
-                    }
-                // Now we have a triangle and valid neighbours, we can do an iteration:
-                for (unsigned int j=0; j<N; ++j)
-                    points_out[2*k*j] = (1-aggressivity) * points_out[2*k*j] +
-                                        aggressivity*0.5f*(points_out[neighbours[j].first] + points_out[neighbours[j].second]);
-
-                for (auto& n : neighbours) {
-                    ++n.first;
-                    --n.second;
-                }
-            }
-            polygon = points_out; // replace the coarse polygon with the smooth one that we just created
-        }
-
-
-        // Raise a bit above the object surface to avoid flickering:
-        for (auto& b : polygon)
-            b(2) += 0.1f;
-
-        // Transform back to 3D (and also back to mesh coordinates)
-        polygon = transform(polygon, inst_matrix.inverse() * m.inverse());
-    }
-
-    // We'll sort the planes by area and only keep the 254 largest ones (because of the picking pass limitations):
-    std::sort(m_planes.rbegin(), m_planes.rend(), [](const PlaneData& a, const PlaneData& b) { return a.area < b.area; });
-    m_planes.resize(std::min((int)m_planes.size(), 254));
-
-    // Planes are finished - let's save what we calculated it from:
-    m_volumes_matrices.clear();
-    m_volumes_types.clear();
-    for (const ModelVolume* vol : mo->volumes) {
-        m_volumes_matrices.push_back(vol->get_matrix());
-        m_volumes_types.push_back(vol->type());
-    }
-    m_first_instance_scale = mo->instances.front()->get_scaling_factor();
-    m_first_instance_mirror = mo->instances.front()->get_mirror();
-    m_old_model_object = mo;
-
-    // And finally create respective VBOs. The polygon is convex with
-    // the vertices in order, so triangulation is trivial.
-    for (auto& plane : m_planes) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        GLModel::Geometry init_data;
-        init_data.format = { GLModel::Geometry::EPrimitiveType::TriangleFan, GLModel::Geometry::EVertexLayout::P3N3 };
-        init_data.reserve_vertices(plane.vertices.size());
-        init_data.reserve_indices(plane.vertices.size());
-        // vertices + indices
-        for (size_t i = 0; i < plane.vertices.size(); ++i) {
-            init_data.add_vertex((Vec3f)plane.vertices[i].cast<float>(), (Vec3f)plane.normal.cast<float>());
-            init_data.add_index((unsigned int)i);
-        }
-        plane.vbo.init_from(std::move(init_data));
-#else
-        plane.vbo.reserve(plane.vertices.size());
-        for (const auto& vert : plane.vertices)
-            plane.vbo.push_geometry(vert, plane.normal);
-        for (size_t i=1; i<plane.vertices.size()-1; ++i)
-            plane.vbo.push_triangle(0, i, i+1); // triangle fan
-        plane.vbo.finalize_geometry(true);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        // FIXME: vertices should really be local, they need not
-        // persist now when we use VBOs
-        plane.vertices.clear();
-        plane.vertices.shrink_to_fit();
-    }
-
-    m_planes_valid = true;
-}
-
-
-bool GLGizmoFlatten::is_plane_update_necessary() const
-{
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    if (m_state != On || ! mo || mo->instances.empty())
-        return false;
-
-    if (! m_planes_valid || mo != m_old_model_object
-     || mo->volumes.size() != m_volumes_matrices.size())
-        return true;
-
-    // We want to recalculate when the scale changes - some planes could (dis)appear.
-    if (! mo->instances.front()->get_scaling_factor().isApprox(m_first_instance_scale)
-     || ! mo->instances.front()->get_mirror().isApprox(m_first_instance_mirror))
-        return true;
-
-    for (unsigned int i=0; i < mo->volumes.size(); ++i)
-        if (! mo->volumes[i]->get_matrix().isApprox(m_volumes_matrices[i])
-         || mo->volumes[i]->type() != m_volumes_types[i])
-            return true;
-
-    return false;
-}
-
-} // namespace GUI
-} // namespace Slic3r
+// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.

+#include "GLGizmoFlatten.hpp"

+#include "slic3r/GUI/GLCanvas3D.hpp"

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+#include "slic3r/GUI/GUI_App.hpp"

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+#include "slic3r/GUI/Plater.hpp"

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"

+

+#include "libslic3r/Geometry/ConvexHull.hpp"

+#include "libslic3r/Model.hpp"

+

+#include <numeric>

+

+#include <GL/glew.h>

+

+namespace Slic3r {

+namespace GUI {

+

+static const Slic3r::ColorRGBA DEFAULT_PLANE_COLOR       = { 0.9f, 0.9f, 0.9f, 0.5f };

+static const Slic3r::ColorRGBA DEFAULT_HOVER_PLANE_COLOR = { 0.9f, 0.9f, 0.9f, 0.75f };

+

+GLGizmoFlatten::GLGizmoFlatten(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)

+    : GLGizmoBase(parent, icon_filename, sprite_id)

+{}

+

+bool GLGizmoFlatten::on_mouse(const wxMouseEvent &mouse_event)

+{

+    if (mouse_event.Moving()) {

+        // only for sure 

+        m_mouse_left_down = false;

+        return false;

+    }

+    if (mouse_event.LeftDown()) {

+        if (m_hover_id != -1) {

+            m_mouse_left_down = true;

+            Selection &selection = m_parent.get_selection();

+            if (selection.is_single_full_instance()) {

+                // Rotate the object so the normal points downward:

+                selection.flattening_rotate(m_planes[m_hover_id].normal);

+                m_parent.do_rotate(L("Gizmo-Place on Face"));

+            }

+            return true;

+        }

+

+        // fix: prevent restart gizmo when reselect object

+        // take responsibility for left up

+        if (m_parent.get_first_hover_volume_idx() >= 0) m_mouse_left_down = true;

+        

+    } else if (mouse_event.LeftUp()) {

+        if (m_mouse_left_down) {

+            // responsible for mouse left up after selecting plane

+            m_mouse_left_down = false;

+            return true;

+        }

+    } else if (mouse_event.Leaving()) {

+        m_mouse_left_down = false;

+    }

+    return false;

+}

+

+void GLGizmoFlatten::data_changed()

+{

+    const Selection &  selection    = m_parent.get_selection();

+    const ModelObject *model_object = nullptr;

+    if (selection.is_single_full_instance() ||

+        selection.is_from_single_object() ) {        

+        model_object = selection.get_model()->objects[selection.get_object_idx()];

+    }    

+    set_flattening_data(model_object);

+}

+

+bool GLGizmoFlatten::on_init()

+{

+    m_shortcut_key = WXK_CONTROL_F;

+    return true;

+}

+

+void GLGizmoFlatten::on_set_state()

+{

+}

+

+CommonGizmosDataID GLGizmoFlatten::on_get_requirements() const

+{

+    return CommonGizmosDataID::SelectionInfo;

+}

+

+std::string GLGizmoFlatten::on_get_name() const

+{

+    return _u8L("Place on face");

+}

+

+bool GLGizmoFlatten::on_is_activable() const

+{

+    // This is assumed in GLCanvas3D::do_rotate, do not change this

+    // without updating that function too.

+    return m_parent.get_selection().is_single_full_instance();

+}

+

+void GLGizmoFlatten::on_render()

+{

+    const Selection& selection = m_parent.get_selection();

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLShaderProgram* shader = wxGetApp().get_shader("flat");

+    if (shader == nullptr)

+        return;

+    

+    shader->start_using();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    glsafe(::glClear(GL_DEPTH_BUFFER_BIT));

+

+    glsafe(::glEnable(GL_DEPTH_TEST));

+    glsafe(::glEnable(GL_BLEND));

+

+    if (selection.is_single_full_instance()) {

+        const Transform3d& m = selection.get_volume(*selection.get_volume_idxs().begin())->get_instance_transformation().get_matrix();

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Camera& camera = wxGetApp().plater()->get_camera();

+        const Transform3d view_model_matrix = camera.get_view_matrix() *

+            Geometry::assemble_transform(selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z() * Vec3d::UnitZ()) * m;

+

+        shader->set_uniform("view_model_matrix", view_model_matrix);

+        shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+#else

+        glsafe(::glPushMatrix());

+        glsafe(::glTranslatef(0.f, 0.f, selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z()));

+        glsafe(::glMultMatrixd(m.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        if (this->is_plane_update_necessary())

+            update_planes();

+        for (int i = 0; i < (int)m_planes.size(); ++i) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+            m_planes[i].vbo.set_color(i == m_hover_id ? DEFAULT_HOVER_PLANE_COLOR : DEFAULT_PLANE_COLOR);

+            m_planes[i].vbo.render();

+#else

+            glsafe(::glColor4fv(i == m_hover_id ? DEFAULT_HOVER_PLANE_COLOR.data() : DEFAULT_PLANE_COLOR.data()));

+            if (m_planes[i].vbo.has_VBOs())

+                m_planes[i].vbo.render();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        }

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+        glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+    }

+

+    glsafe(::glEnable(GL_CULL_FACE));

+    glsafe(::glDisable(GL_BLEND));

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    shader->stop_using();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+}

+

+void GLGizmoFlatten::on_render_for_picking()

+{

+    const Selection& selection = m_parent.get_selection();

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLShaderProgram* shader = wxGetApp().get_shader("flat");

+    if (shader == nullptr)

+        return;

+

+    shader->start_using();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    glsafe(::glDisable(GL_DEPTH_TEST));

+    glsafe(::glDisable(GL_BLEND));

+

+    if (selection.is_single_full_instance() && !wxGetKeyState(WXK_CONTROL)) {

+        const Transform3d& m = selection.get_volume(*selection.get_volume_idxs().begin())->get_instance_transformation().get_matrix();

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Camera& camera = wxGetApp().plater()->get_camera();

+        const Transform3d view_model_matrix = camera.get_view_matrix() *

+            Geometry::assemble_transform(selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z() * Vec3d::UnitZ()) * m;

+

+        shader->set_uniform("view_model_matrix", view_model_matrix);

+        shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+#else

+        glsafe(::glPushMatrix());

+        glsafe(::glTranslatef(0.f, 0.f, selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z()));

+        glsafe(::glMultMatrixd(m.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        if (this->is_plane_update_necessary())

+            update_planes();

+        for (int i = 0; i < (int)m_planes.size(); ++i) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+            m_planes[i].vbo.set_color(picking_color_component(i));

+#else

+            glsafe(::glColor4fv(picking_color_component(i).data()));

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+            m_planes[i].vbo.render();

+        }

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+        glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+    }

+

+    glsafe(::glEnable(GL_CULL_FACE));

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    shader->stop_using();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+}

+

+void GLGizmoFlatten::set_flattening_data(const ModelObject* model_object)

+{

+    if (model_object != m_old_model_object) {

+        m_planes.clear();

+        m_planes_valid = false;

+    }

+}

+

+void GLGizmoFlatten::update_planes()

+{

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    TriangleMesh ch;

+    for (const ModelVolume* vol : mo->volumes) {

+        if (vol->type() != ModelVolumeType::MODEL_PART)

+            continue;

+        TriangleMesh vol_ch = vol->get_convex_hull();

+        vol_ch.transform(vol->get_matrix());

+        ch.merge(vol_ch);

+    }

+    ch = ch.convex_hull_3d();

+    m_planes.clear();

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d inst_matrix = mo->instances.front()->get_matrix_no_offset();

+#else

+    const Transform3d& inst_matrix = mo->instances.front()->get_matrix(true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+

+    // Following constants are used for discarding too small polygons.

+    const float minimal_area = 5.f; // in square mm (world coordinates)

+    const float minimal_side = 1.f; // mm

+

+    // Now we'll go through all the facets and append Points of facets sharing the same normal.

+    // This part is still performed in mesh coordinate system.

+    const int                num_of_facets  = ch.facets_count();

+    const std::vector<Vec3f> face_normals   = its_face_normals(ch.its);

+    const std::vector<Vec3i> face_neighbors = its_face_neighbors(ch.its);

+    std::vector<int>         facet_queue(num_of_facets, 0);

+    std::vector<bool>        facet_visited(num_of_facets, false);

+    int                      facet_queue_cnt = 0;

+    const stl_normal*        normal_ptr      = nullptr;

+    int facet_idx = 0;

+    while (1) {

+        // Find next unvisited triangle:

+        for (; facet_idx < num_of_facets; ++ facet_idx)

+            if (!facet_visited[facet_idx]) {

+                facet_queue[facet_queue_cnt ++] = facet_idx;

+                facet_visited[facet_idx] = true;

+                normal_ptr = &face_normals[facet_idx];

+                m_planes.emplace_back();

+                break;

+            }

+        if (facet_idx == num_of_facets)

+            break; // Everything was visited already

+

+        while (facet_queue_cnt > 0) {

+            int facet_idx = facet_queue[-- facet_queue_cnt];

+            const stl_normal& this_normal = face_normals[facet_idx];

+            if (std::abs(this_normal(0) - (*normal_ptr)(0)) < 0.001 && std::abs(this_normal(1) - (*normal_ptr)(1)) < 0.001 && std::abs(this_normal(2) - (*normal_ptr)(2)) < 0.001) {

+                const Vec3i face = ch.its.indices[facet_idx];

+                for (int j=0; j<3; ++j)

+                    m_planes.back().vertices.emplace_back(ch.its.vertices[face[j]].cast<double>());

+

+                facet_visited[facet_idx] = true;

+                for (int j = 0; j < 3; ++ j)

+                    if (int neighbor_idx = face_neighbors[facet_idx][j]; neighbor_idx >= 0 && ! facet_visited[neighbor_idx])

+                        facet_queue[facet_queue_cnt ++] = neighbor_idx;

+            }

+        }

+        m_planes.back().normal = normal_ptr->cast<double>();

+

+        Pointf3s& verts = m_planes.back().vertices;

+        // Now we'll transform all the points into world coordinates, so that the areas, angles and distances

+        // make real sense.

+        verts = transform(verts, inst_matrix);

+

+        // if this is a just a very small triangle, remove it to speed up further calculations (it would be rejected later anyway):

+        if (verts.size() == 3 &&

+            ((verts[0] - verts[1]).norm() < minimal_side

+            || (verts[0] - verts[2]).norm() < minimal_side

+            || (verts[1] - verts[2]).norm() < minimal_side))

+            m_planes.pop_back();

+    }

+

+    // Let's prepare transformation of the normal vector from mesh to instance coordinates.

+    Geometry::Transformation t(inst_matrix);

+    Vec3d scaling = t.get_scaling_factor();

+    t.set_scaling_factor(Vec3d(1./scaling(0), 1./scaling(1), 1./scaling(2)));

+

+    // Now we'll go through all the polygons, transform the points into xy plane to process them:

+    for (unsigned int polygon_id=0; polygon_id < m_planes.size(); ++polygon_id) {

+        Pointf3s& polygon = m_planes[polygon_id].vertices;

+        const Vec3d& normal = m_planes[polygon_id].normal;

+

+        // transform the normal according to the instance matrix:

+        Vec3d normal_transformed = t.get_matrix() * normal;

+

+        // We are going to rotate about z and y to flatten the plane

+        Eigen::Quaterniond q;

+        Transform3d m = Transform3d::Identity();

+        m.matrix().block(0, 0, 3, 3) = q.setFromTwoVectors(normal_transformed, Vec3d::UnitZ()).toRotationMatrix();

+        polygon = transform(polygon, m);

+

+        // Now to remove the inner points. We'll misuse Geometry::convex_hull for that, but since

+        // it works in fixed point representation, we will rescale the polygon to avoid overflows.

+        // And yes, it is a nasty thing to do. Whoever has time is free to refactor.

+        Vec3d bb_size = BoundingBoxf3(polygon).size();

+        float sf = std::min(1./bb_size(0), 1./bb_size(1));

+        Transform3d tr = Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), Vec3d(sf, sf, 1.f));

+        polygon = transform(polygon, tr);

+        polygon = Slic3r::Geometry::convex_hull(polygon);

+        polygon = transform(polygon, tr.inverse());

+

+        // Calculate area of the polygons and discard ones that are too small

+        float& area = m_planes[polygon_id].area;

+        area = 0.f;

+        for (unsigned int i = 0; i < polygon.size(); i++) // Shoelace formula

+            area += polygon[i](0)*polygon[i + 1 < polygon.size() ? i + 1 : 0](1) - polygon[i + 1 < polygon.size() ? i + 1 : 0](0)*polygon[i](1);

+        area = 0.5f * std::abs(area);

+

+        bool discard = false;

+        if (area < minimal_area)

+            discard = true;

+        else {

+            // We also check the inner angles and discard polygons with angles smaller than the following threshold

+            const double angle_threshold = ::cos(10.0 * (double)PI / 180.0);

+

+            for (unsigned int i = 0; i < polygon.size(); ++i) {

+                const Vec3d& prec = polygon[(i == 0) ? polygon.size() - 1 : i - 1];

+                const Vec3d& curr = polygon[i];

+                const Vec3d& next = polygon[(i == polygon.size() - 1) ? 0 : i + 1];

+

+                if ((prec - curr).normalized().dot((next - curr).normalized()) > angle_threshold) {

+                    discard = true;

+                    break;

+                }

+            }

+        }

+

+        if (discard) {

+            m_planes[polygon_id--] = std::move(m_planes.back());

+            m_planes.pop_back();

+            continue;

+        }

+

+        // We will shrink the polygon a little bit so it does not touch the object edges:

+        Vec3d centroid = std::accumulate(polygon.begin(), polygon.end(), Vec3d(0.0, 0.0, 0.0));

+        centroid /= (double)polygon.size();

+        for (auto& vertex : polygon)

+            vertex = 0.9f*vertex + 0.1f*centroid;

+

+        // Polygon is now simple and convex, we'll round the corners to make them look nicer.

+        // The algorithm takes a vertex, calculates middles of respective sides and moves the vertex

+        // towards their average (controlled by 'aggressivity'). This is repeated k times.

+        // In next iterations, the neighbours are not always taken at the middle (to increase the

+        // rounding effect at the corners, where we need it most).

+        const unsigned int k = 10; // number of iterations

+        const float aggressivity = 0.2f;  // agressivity

+        const unsigned int N = polygon.size();

+        std::vector<std::pair<unsigned int, unsigned int>> neighbours;

+        if (k != 0) {

+            Pointf3s points_out(2*k*N); // vector long enough to store the future vertices

+            for (unsigned int j=0; j<N; ++j) {

+                points_out[j*2*k] = polygon[j];

+                neighbours.push_back(std::make_pair((int)(j*2*k-k) < 0 ? (N-1)*2*k+k : j*2*k-k, j*2*k+k));

+            }

+

+            for (unsigned int i=0; i<k; ++i) {

+                // Calculate middle of each edge so that neighbours points to something useful:

+                for (unsigned int j=0; j<N; ++j)

+                    if (i==0)

+                        points_out[j*2*k+k] = 0.5f * (points_out[j*2*k] + points_out[j==N-1 ? 0 : (j+1)*2*k]);

+                    else {

+                        float r = 0.2+0.3/(k-1)*i; // the neighbours are not always taken in the middle

+                        points_out[neighbours[j].first] = r*points_out[j*2*k] + (1-r) * points_out[neighbours[j].first-1];

+                        points_out[neighbours[j].second] = r*points_out[j*2*k] + (1-r) * points_out[neighbours[j].second+1];

+                    }

+                // Now we have a triangle and valid neighbours, we can do an iteration:

+                for (unsigned int j=0; j<N; ++j)

+                    points_out[2*k*j] = (1-aggressivity) * points_out[2*k*j] +

+                                        aggressivity*0.5f*(points_out[neighbours[j].first] + points_out[neighbours[j].second]);

+

+                for (auto& n : neighbours) {

+                    ++n.first;

+                    --n.second;

+                }

+            }

+            polygon = points_out; // replace the coarse polygon with the smooth one that we just created

+        }

+

+

+        // Raise a bit above the object surface to avoid flickering:

+        for (auto& b : polygon)

+            b(2) += 0.1f;

+

+        // Transform back to 3D (and also back to mesh coordinates)

+        polygon = transform(polygon, inst_matrix.inverse() * m.inverse());

+    }

+

+    // We'll sort the planes by area and only keep the 254 largest ones (because of the picking pass limitations):

+    std::sort(m_planes.rbegin(), m_planes.rend(), [](const PlaneData& a, const PlaneData& b) { return a.area < b.area; });

+    m_planes.resize(std::min((int)m_planes.size(), 254));

+

+    // Planes are finished - let's save what we calculated it from:

+    m_volumes_matrices.clear();

+    m_volumes_types.clear();

+    for (const ModelVolume* vol : mo->volumes) {

+        m_volumes_matrices.push_back(vol->get_matrix());

+        m_volumes_types.push_back(vol->type());

+    }

+    m_first_instance_scale = mo->instances.front()->get_scaling_factor();

+    m_first_instance_mirror = mo->instances.front()->get_mirror();

+    m_old_model_object = mo;

+

+    // And finally create respective VBOs. The polygon is convex with

+    // the vertices in order, so triangulation is trivial.

+    for (auto& plane : m_planes) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        GLModel::Geometry init_data;

+        init_data.format = { GLModel::Geometry::EPrimitiveType::TriangleFan, GLModel::Geometry::EVertexLayout::P3N3 };

+        init_data.reserve_vertices(plane.vertices.size());

+        init_data.reserve_indices(plane.vertices.size());

+        // vertices + indices

+        for (size_t i = 0; i < plane.vertices.size(); ++i) {

+            init_data.add_vertex((Vec3f)plane.vertices[i].cast<float>(), (Vec3f)plane.normal.cast<float>());

+            init_data.add_index((unsigned int)i);

+        }

+        plane.vbo.init_from(std::move(init_data));

+#else

+        plane.vbo.reserve(plane.vertices.size());

+        for (const auto& vert : plane.vertices)

+            plane.vbo.push_geometry(vert, plane.normal);

+        for (size_t i=1; i<plane.vertices.size()-1; ++i)

+            plane.vbo.push_triangle(0, i, i+1); // triangle fan

+        plane.vbo.finalize_geometry(true);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        // FIXME: vertices should really be local, they need not

+        // persist now when we use VBOs

+        plane.vertices.clear();

+        plane.vertices.shrink_to_fit();

+    }

+

+    m_planes_valid = true;

+}

+

+

+bool GLGizmoFlatten::is_plane_update_necessary() const

+{

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    if (m_state != On || ! mo || mo->instances.empty())

+        return false;

+

+    if (! m_planes_valid || mo != m_old_model_object

+     || mo->volumes.size() != m_volumes_matrices.size())

+        return true;

+

+    // We want to recalculate when the scale changes - some planes could (dis)appear.

+    if (! mo->instances.front()->get_scaling_factor().isApprox(m_first_instance_scale)

+     || ! mo->instances.front()->get_mirror().isApprox(m_first_instance_mirror))

+        return true;

+

+    for (unsigned int i=0; i < mo->volumes.size(); ++i)

+        if (! mo->volumes[i]->get_matrix().isApprox(m_volumes_matrices[i])

+         || mo->volumes[i]->type() != m_volumes_types[i])

+            return true;

+

+    return false;

+}

+

+} // namespace GUI

+} // namespace Slic3r

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
index 88b319f25..a60da3591 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
@@ -1,988 +1,992 @@
-#include "GLGizmoHollow.hpp"
-#include "slic3r/GUI/GLCanvas3D.hpp"
-#include "slic3r/GUI/Camera.hpp"
-#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"
-
-#include <GL/glew.h>
-
-#include "slic3r/GUI/GUI_App.hpp"
-#include "slic3r/GUI/GUI_ObjectSettings.hpp"
-#include "slic3r/GUI/GUI_ObjectList.hpp"
-#include "slic3r/GUI/Plater.hpp"
-#include "libslic3r/PresetBundle.hpp"
-
-#include "libslic3r/Model.hpp"
-
-
-namespace Slic3r {
-namespace GUI {
-
-GLGizmoHollow::GLGizmoHollow(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
-    : GLGizmoBase(parent, icon_filename, sprite_id)
-{
-}
-
-
-bool GLGizmoHollow::on_init()
-{
-    m_shortcut_key = WXK_CONTROL_H;
-    m_desc["enable"]           = _(L("Hollow this object"));
-    m_desc["preview"]          = _(L("Preview hollowed and drilled model"));
-    m_desc["offset"]           = _(L("Offset")) + ": ";
-    m_desc["quality"]          = _(L("Quality")) + ": ";
-    m_desc["closing_distance"] = _(L("Closing distance")) + ": ";
-    m_desc["hole_diameter"]    = _(L("Hole diameter")) + ": ";
-    m_desc["hole_depth"]       = _(L("Hole depth")) + ": ";
-    m_desc["remove_selected"]  = _(L("Remove selected holes"));
-    m_desc["remove_all"]       = _(L("Remove all holes"));
-    m_desc["clipping_of_view"] = _(L("Clipping of view"))+ ": ";
-    m_desc["reset_direction"]  = _(L("Reset direction"));
-    m_desc["show_supports"]    = _(L("Show supports"));
-
-    return true;
-}
-
-void GLGizmoHollow::data_changed()
-{
-    if (! m_c->selection_info())
-        return;
-
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    if (m_state == On && mo) {
-        if (m_old_mo_id != mo->id()) {
-            reload_cache();
-            m_old_mo_id = mo->id();
-        }
-        if (m_c->hollowed_mesh() && m_c->hollowed_mesh()->get_hollowed_mesh())
-            m_holes_in_drilled_mesh = mo->sla_drain_holes;
-    }
-}
-
-
-
-void GLGizmoHollow::on_render()
-{
-    if (!m_cylinder.is_initialized())
-        m_cylinder.init_from(its_make_cylinder(1.0, 1.0));
-
-    const Selection& selection = m_parent.get_selection();
-    const CommonGizmosDataObjects::SelectionInfo* sel_info = m_c->selection_info();
-
-    // If current m_c->m_model_object does not match selection, ask GLCanvas3D to turn us off
-    if (m_state == On
-     && (sel_info->model_object() != selection.get_model()->objects[selection.get_object_idx()]
-      || sel_info->get_active_instance() != selection.get_instance_idx())) {
-        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_RESETGIZMOS));
-        return;
-    }
-
-    glsafe(::glEnable(GL_BLEND));
-    glsafe(::glEnable(GL_DEPTH_TEST));
-
-    if (selection.is_from_single_instance())
-        render_points(selection, false);
-
-    m_selection_rectangle.render(m_parent);
-    m_c->object_clipper()->render_cut();
-    m_c->supports_clipper()->render_cut();
-
-    glsafe(::glDisable(GL_BLEND));
-}
-
-
-void GLGizmoHollow::on_render_for_picking()
-{
-    const Selection& selection = m_parent.get_selection();
-//#if ENABLE_RENDER_PICKING_PASS
-//    m_z_shift = selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z();
-//#endif
-
-    glsafe(::glEnable(GL_DEPTH_TEST));
-    render_points(selection, true);
-}
-
-void GLGizmoHollow::render_points(const Selection& selection, bool picking)
-{
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLShaderProgram* shader = picking ? wxGetApp().get_shader("flat") : wxGetApp().get_shader("gouraud_light");
-    if (shader == nullptr)
-        return;
-
-    shader->start_using();
-    ScopeGuard guard([shader]() { shader->stop_using(); });
-#else
-    GLShaderProgram* shader = picking ? nullptr : wxGetApp().get_shader("gouraud_light");
-    if (shader)
-        shader->start_using();
-    ScopeGuard guard([shader]() { if (shader) shader->stop_using(); });
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    const GLVolume* vol = selection.get_volume(*selection.get_volume_idxs().begin());
-    Geometry::Transformation trafo =  vol->get_instance_transformation() * vol->get_volume_transformation();
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    const Transform3d instance_scaling_matrix_inverse = vol->get_instance_transformation().get_matrix(true, true, false, true).inverse();
-    const Transform3d instance_matrix = Geometry::assemble_transform(m_c->selection_info()->get_sla_shift() * Vec3d::UnitZ()) * trafo.get_matrix();
-
-    const Camera& camera = wxGetApp().plater()->get_camera();
-    const Transform3d& view_matrix = camera.get_view_matrix();
-    const Transform3d& projection_matrix = camera.get_projection_matrix();
-
-    shader->set_uniform("projection_matrix", projection_matrix);
-#else
-    const Transform3d& instance_scaling_matrix_inverse = trafo.get_matrix(true, true, false, true).inverse();
-    const Transform3d& instance_matrix = trafo.get_matrix();
-
-    glsafe(::glPushMatrix());
-    glsafe(::glTranslated(0.0, 0.0, m_c->selection_info()->get_sla_shift()));
-    glsafe(::glMultMatrixd(instance_matrix.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-    ColorRGBA render_color;
-    const sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;
-    const size_t cache_size = drain_holes.size();
-
-    for (size_t i = 0; i < cache_size; ++i) {
-        const sla::DrainHole& drain_hole = drain_holes[i];
-        const bool point_selected = m_selected[i];
-
-        if (is_mesh_point_clipped(drain_hole.pos.cast<double>()))
-            continue;
-
-        // First decide about the color of the point.
-        if (picking)
-            render_color = picking_color_component(i);
-        else {
-            if (size_t(m_hover_id) == i)
-                render_color = ColorRGBA::CYAN();
-            else if (m_c->hollowed_mesh() &&
-                       i < m_c->hollowed_mesh()->get_drainholes().size() &&
-                       m_c->hollowed_mesh()->get_drainholes()[i].failed) {
-                render_color = { 1.0f, 0.0f, 0.0f, 0.5f };
-            }
-            else  // neither hover nor picking
-                render_color = point_selected ? ColorRGBA(1.0f, 0.3f, 0.3f, 0.5f) : ColorRGBA(1.0f, 1.0f, 1.0f, 0.5f);
-        }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        m_cylinder.set_color(render_color);
-#else
-        const_cast<GLModel*>(&m_cylinder)->set_color(-1, render_color);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-        // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Transform3d hole_matrix = Geometry::assemble_transform(drain_hole.pos.cast<double>()) * instance_scaling_matrix_inverse;
-#else
-        glsafe(::glPushMatrix());
-        glsafe(::glTranslatef(drain_hole.pos.x(), drain_hole.pos.y(), drain_hole.pos.z()));
-        glsafe(::glMultMatrixd(instance_scaling_matrix_inverse.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-        if (vol->is_left_handed())
-            glFrontFace(GL_CW);
-
-        // Matrices set, we can render the point mark now.
-        Eigen::Quaterniond q;
-        q.setFromTwoVectors(Vec3d::UnitZ(), instance_scaling_matrix_inverse * (-drain_hole.normal).cast<double>());
-        const Eigen::AngleAxisd aa(q);
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Transform3d view_model_matrix = view_matrix * instance_matrix * hole_matrix * Transform3d(aa.toRotationMatrix()) *
-            Geometry::assemble_transform(-drain_hole.height * Vec3d::UnitZ(), Vec3d::Zero(), Vec3d(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));
-
-        shader->set_uniform("view_model_matrix", view_model_matrix);
-        shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
-#else
-        glsafe(::glRotated(aa.angle() * (180. / M_PI), aa.axis().x(), aa.axis().y(), aa.axis().z()));
-        glsafe(::glTranslated(0., 0., -drain_hole.height));
-        glsafe(::glScaled(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        m_cylinder.render();
-
-        if (vol->is_left_handed())
-            glFrontFace(GL_CCW);
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-            glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-    }
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-        glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-}
-
-bool GLGizmoHollow::is_mesh_point_clipped(const Vec3d& point) const
-{
-    if (m_c->object_clipper()->get_position() == 0.)
-        return false;
-
-    auto sel_info = m_c->selection_info();
-    int active_inst = m_c->selection_info()->get_active_instance();
-    const ModelInstance* mi = sel_info->model_object()->instances[active_inst];
-    const Transform3d& trafo = mi->get_transformation().get_matrix() * sel_info->model_object()->volumes.front()->get_matrix();
-
-    Vec3d transformed_point =  trafo * point;
-    transformed_point(2) += sel_info->get_sla_shift();
-    return m_c->object_clipper()->get_clipping_plane()->is_point_clipped(transformed_point);
-}
-
-
-
-// Unprojects the mouse position on the mesh and saves hit point and normal of the facet into pos_and_normal
-// Return false if no intersection was found, true otherwise.
-bool GLGizmoHollow::unproject_on_mesh(const Vec2d& mouse_pos, std::pair<Vec3f, Vec3f>& pos_and_normal)
-{
-    if (! m_c->raycaster()->raycaster())
-        return false;
-
-    const Camera& camera = wxGetApp().plater()->get_camera();
-    const Selection& selection = m_parent.get_selection();
-    const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());
-    Geometry::Transformation trafo = volume->get_instance_transformation() * volume->get_volume_transformation();
-    trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));
-
-    double clp_dist = m_c->object_clipper()->get_position();
-    const ClippingPlane* clp = m_c->object_clipper()->get_clipping_plane();
-
-    // The raycaster query
-    Vec3f hit;
-    Vec3f normal;
-    if (m_c->raycaster()->raycaster()->unproject_on_mesh(
-            mouse_pos,
-            trafo.get_matrix(),
-            camera,
-            hit,
-            normal,
-            clp_dist != 0. ? clp : nullptr))
-    {
-        if (m_c->hollowed_mesh() && m_c->hollowed_mesh()->get_hollowed_mesh()) {
-            // in this case the raycaster sees the hollowed and drilled mesh.
-            // if the point lies on the surface created by the hole, we want
-            // to ignore it.
-            for (const sla::DrainHole& hole : m_holes_in_drilled_mesh) {
-                sla::DrainHole outer(hole);
-                outer.radius *= 1.001f;
-                outer.height *= 1.001f;
-                if (outer.is_inside(hit))
-                    return false;
-            }
-        }
-
-        // Return both the point and the facet normal.
-        pos_and_normal = std::make_pair(hit, normal);
-        return true;
-    }
-    else
-        return false;
-}
-
-// Following function is called from GLCanvas3D to inform the gizmo about a mouse/keyboard event.
-// The gizmo has an opportunity to react - if it does, it should return true so that the Canvas3D is
-// aware that the event was reacted to and stops trying to make different sense of it. If the gizmo
-// concludes that the event was not intended for it, it should return false.
-bool GLGizmoHollow::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)
-{
-    ModelObject* mo = m_c->selection_info()->model_object();
-    int active_inst = m_c->selection_info()->get_active_instance();
-
-
-    // left down with shift - show the selection rectangle:
-    if (action == SLAGizmoEventType::LeftDown && (shift_down || alt_down || control_down)) {
-        if (m_hover_id == -1) {
-            if (shift_down || alt_down) {
-                m_selection_rectangle.start_dragging(mouse_position, shift_down ? GLSelectionRectangle::EState::Select : GLSelectionRectangle::EState::Deselect);
-            }
-        }
-        else {
-            if (m_selected[m_hover_id])
-                unselect_point(m_hover_id);
-            else {
-                if (!alt_down)
-                    select_point(m_hover_id);
-            }
-        }
-
-        return true;
-    }
-
-    // left down without selection rectangle - place point on the mesh:
-    if (action == SLAGizmoEventType::LeftDown && !m_selection_rectangle.is_dragging() && !shift_down) {
-        // If any point is in hover state, this should initiate its move - return control back to GLCanvas:
-        if (m_hover_id != -1)
-            return false;
-
-        // If there is some selection, don't add new point and deselect everything instead.
-        if (m_selection_empty) {
-            std::pair<Vec3f, Vec3f> pos_and_normal;
-            if (unproject_on_mesh(mouse_position, pos_and_normal)) { // we got an intersection
-                Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Add drainage hole")));
-
-                mo->sla_drain_holes.emplace_back(pos_and_normal.first,
-                                                -pos_and_normal.second, m_new_hole_radius, m_new_hole_height);
-                m_selected.push_back(false);
-                assert(m_selected.size() == mo->sla_drain_holes.size());
-                m_parent.set_as_dirty();
-                m_wait_for_up_event = true;
-            }
-            else
-                return false;
-        }
-        else
-            select_point(NoPoints);
-
-        return true;
-    }
-
-    // left up with selection rectangle - select points inside the rectangle:
-    if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::ShiftUp || action == SLAGizmoEventType::AltUp) && m_selection_rectangle.is_dragging()) {
-        // Is this a selection or deselection rectangle?
-        GLSelectionRectangle::EState rectangle_status = m_selection_rectangle.get_state();
-
-        // First collect positions of all the points in world coordinates.
-        Geometry::Transformation trafo = mo->instances[active_inst]->get_transformation();
-        trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));
-        std::vector<Vec3d> points;
-        for (unsigned int i=0; i<mo->sla_drain_holes.size(); ++i)
-            points.push_back(trafo.get_matrix() * mo->sla_drain_holes[i].pos.cast<double>());
-
-        // Now ask the rectangle which of the points are inside.
-        std::vector<Vec3f> points_inside;
-        std::vector<unsigned int> points_idxs = m_selection_rectangle.stop_dragging(m_parent, points);
-        for (size_t idx : points_idxs)
-            points_inside.push_back(points[idx].cast<float>());
-
-        // Only select/deselect points that are actually visible
-        for (size_t idx : m_c->raycaster()->raycaster()->get_unobscured_idxs(
-                 trafo, wxGetApp().plater()->get_camera(), points_inside,
-                 m_c->object_clipper()->get_clipping_plane()))
-        {
-            if (rectangle_status == GLSelectionRectangle::EState::Deselect)
-                unselect_point(points_idxs[idx]);
-            else
-                select_point(points_idxs[idx]);
-        }
-        return true;
-    }
-
-    // left up with no selection rectangle
-    if (action == SLAGizmoEventType::LeftUp) {
-        if (m_wait_for_up_event) {
-            m_wait_for_up_event = false;
-            return true;
-        }
-    }
-
-    // dragging the selection rectangle:
-    if (action == SLAGizmoEventType::Dragging) {
-        if (m_wait_for_up_event)
-            return true; // point has been placed and the button not released yet
-                         // this prevents GLCanvas from starting scene rotation
-
-        if (m_selection_rectangle.is_dragging())  {
-            m_selection_rectangle.dragging(mouse_position);
-            return true;
-        }
-
-        return false;
-    }
-
-    if (action == SLAGizmoEventType::Delete) {
-        // delete key pressed
-        delete_selected_points();
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::RightDown) {
-        if (m_hover_id != -1) {
-            select_point(NoPoints);
-            select_point(m_hover_id);
-            delete_selected_points();
-            return true;
-        }
-        return false;
-    }
-
-    if (action == SLAGizmoEventType::SelectAll) {
-        select_point(AllPoints);
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::MouseWheelUp && control_down) {
-        double pos = m_c->object_clipper()->get_position();
-        pos = std::min(1., pos + 0.01);
-        m_c->object_clipper()->set_position(pos, true);
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::MouseWheelDown && control_down) {
-        double pos = m_c->object_clipper()->get_position();
-        pos = std::max(0., pos - 0.01);
-        m_c->object_clipper()->set_position(pos, true);
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::ResetClippingPlane) {
-        m_c->object_clipper()->set_position(-1., false);
-        return true;
-    }
-
-    return false;
-}
-
-void GLGizmoHollow::delete_selected_points()
-{
-    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Delete drainage hole")));
-    sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;
-
-    for (unsigned int idx=0; idx<drain_holes.size(); ++idx) {
-        if (m_selected[idx]) {
-            m_selected.erase(m_selected.begin()+idx);
-            drain_holes.erase(drain_holes.begin() + (idx--));
-        }
-    }
-
-    select_point(NoPoints);
-}
-
-bool GLGizmoHollow::on_mouse(const wxMouseEvent &mouse_event)
-{
-    if (mouse_event.Moving()) return false;
-    if (use_grabbers(mouse_event)) return true;
-
-    // wxCoord == int --> wx/types.h
-    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());
-    Vec2d mouse_pos = mouse_coord.cast<double>();
-
-    static bool pending_right_up = false;
-    if (mouse_event.LeftDown()) {
-        bool control_down = mouse_event.CmdDown();
-        bool grabber_contains_mouse = (get_hover_id() != -1);
-        if ((!control_down || grabber_contains_mouse) &&
-            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))
-            // the gizmo got the event and took some action, there is no need
-            // to do anything more
-            return true;
-    } else if (mouse_event.Dragging()) {
-        if (m_parent.get_move_volume_id() != -1)
-            // don't allow dragging objects with the Sla gizmo on
-            return true;
-
-        bool control_down = mouse_event.CmdDown();
-        if (control_down) {
-            // CTRL has been pressed while already dragging -> stop current action
-            if (mouse_event.LeftIsDown())
-                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);
-            else if (mouse_event.RightIsDown()) {
-                pending_right_up = false;
-            }
-        } else if(gizmo_event(SLAGizmoEventType::Dragging, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false)) {
-            // the gizmo got the event and took some action, no need to do
-            // anything more here
-            m_parent.set_as_dirty();
-            return true;
-        }
-    } else if (mouse_event.LeftUp()) {    
-        if (!m_parent.is_mouse_dragging()) {
-            bool control_down = mouse_event.CmdDown();
-            // in case gizmo is selected, we just pass the LeftUp event
-            // and stop processing - neither object moving or selecting is
-            // suppressed in that case
-            gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), control_down);
-            return true;
-        }
-    } else if (mouse_event.RightDown()) {
-        if (m_parent.get_selection().get_object_idx() != -1 &&
-            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) {
-            // we need to set the following right up as processed to avoid showing
-            // the context menu if the user release the mouse over the object
-            pending_right_up = true;
-            // event was taken care of by the SlaSupports gizmo
-            return true;
-        }
-    } else if (mouse_event.RightUp()) {
-        if (pending_right_up) {
-            pending_right_up = false;
-            return true;
-        }
-    }
-    return false;
-}
-
-void GLGizmoHollow::hollow_mesh(bool postpone_error_messages)
-{
-    wxGetApp().CallAfter([this, postpone_error_messages]() {
-        wxGetApp().plater()->reslice_SLA_hollowing(
-            *m_c->selection_info()->model_object(), postpone_error_messages);
-    });
-}
-
-
-std::vector<std::pair<const ConfigOption*, const ConfigOptionDef*>>
-GLGizmoHollow::get_config_options(const std::vector<std::string>& keys) const
-{
-    std::vector<std::pair<const ConfigOption*, const ConfigOptionDef*>> out;
-    const ModelObject* mo = m_c->selection_info()->model_object();
-
-    if (! mo)
-        return out;
-
-    const DynamicPrintConfig& object_cfg = mo->config.get();
-    const DynamicPrintConfig& print_cfg = wxGetApp().preset_bundle->sla_prints.get_edited_preset().config;
-    std::unique_ptr<DynamicPrintConfig> default_cfg = nullptr;
-
-    for (const std::string& key : keys) {
-        if (object_cfg.has(key))
-            out.emplace_back(object_cfg.option(key), &object_cfg.def()->options.at(key)); // at() needed for const map
-        else
-            if (print_cfg.has(key))
-                out.emplace_back(print_cfg.option(key), &print_cfg.def()->options.at(key));
-            else { // we must get it from defaults
-                if (default_cfg == nullptr)
-                    default_cfg.reset(DynamicPrintConfig::new_from_defaults_keys(keys));
-                out.emplace_back(default_cfg->option(key), &default_cfg->def()->options.at(key));
-            }
-    }
-
-    return out;
-}
-
-
-void GLGizmoHollow::on_render_input_window(float x, float y, float bottom_limit)
-{
-    ModelObject* mo = m_c->selection_info()->model_object();
-    if (! mo)
-        return;
-
-    bool first_run = true; // This is a hack to redraw the button when all points are removed,
-                           // so it is not delayed until the background process finishes.
-
-    ConfigOptionMode current_mode = wxGetApp().get_mode();
-
-    std::vector<std::string> opts_keys = {"hollowing_min_thickness", "hollowing_quality", "hollowing_closing_distance"};
-    auto opts = get_config_options(opts_keys);
-    auto* offset_cfg = static_cast<const ConfigOptionFloat*>(opts[0].first);
-    float offset = offset_cfg->value;
-    double offset_min = opts[0].second->min;
-    double offset_max = opts[0].second->max;
-
-    auto* quality_cfg = static_cast<const ConfigOptionFloat*>(opts[1].first);
-    float quality = quality_cfg->value;
-    double quality_min = opts[1].second->min;
-    double quality_max = opts[1].second->max;
-    ConfigOptionMode quality_mode = opts[1].second->mode;
-
-    auto* closing_d_cfg = static_cast<const ConfigOptionFloat*>(opts[2].first);
-    float closing_d = closing_d_cfg->value;
-    double closing_d_min = opts[2].second->min;
-    double closing_d_max = opts[2].second->max;
-    ConfigOptionMode closing_d_mode = opts[2].second->mode;
-
-    m_desc["offset"] = _(opts[0].second->label) + ":";
-    m_desc["quality"] = _(opts[1].second->label) + ":";
-    m_desc["closing_distance"] = _(opts[2].second->label) + ":";
-
-
-RENDER_AGAIN:
-    const float approx_height = m_imgui->scaled(20.0f);
-    y = std::min(y, bottom_limit - approx_height);
-    m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);
-
-    m_imgui->begin(get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);
-
-    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:
-    const float clipping_slider_left = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x,
-                                                m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(0.5f);
-
-    const float settings_sliders_left =
-        std::max(std::max({m_imgui->calc_text_size(m_desc.at("offset")).x,
-                           m_imgui->calc_text_size(m_desc.at("quality")).x,
-                           m_imgui->calc_text_size(m_desc.at("closing_distance")).x,
-                           m_imgui->calc_text_size(m_desc.at("hole_diameter")).x,
-                           m_imgui->calc_text_size(m_desc.at("hole_depth")).x}) + m_imgui->scaled(0.5f), clipping_slider_left);
-
-    const float diameter_slider_left = settings_sliders_left; //m_imgui->calc_text_size(m_desc.at("hole_diameter")).x + m_imgui->scaled(1.f);
-    const float minimal_slider_width = m_imgui->scaled(4.f);
-
-    const float button_preview_width = m_imgui->calc_button_size(m_desc.at("preview")).x;
-
-    float window_width = minimal_slider_width + std::max({settings_sliders_left, clipping_slider_left, diameter_slider_left});
-    window_width = std::max(window_width, button_preview_width);
-
-    if (m_imgui->button(m_desc["preview"]))
-        hollow_mesh();
-    
-    bool config_changed = false;
-
-    ImGui::Separator();
-
-    {
-        auto opts = get_config_options({"hollowing_enable"});
-        m_enable_hollowing = static_cast<const ConfigOptionBool*>(opts[0].first)->value;
-        if (m_imgui->checkbox(m_desc["enable"], m_enable_hollowing)) {
-            mo->config.set("hollowing_enable", m_enable_hollowing);
-            wxGetApp().obj_list()->update_and_show_object_settings_item();
-            config_changed = true;
-        }
-    }
-
-    m_imgui->disabled_begin(! m_enable_hollowing);
-    ImGui::AlignTextToFramePadding();
-    m_imgui->text(m_desc.at("offset"));
-    ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);
-    ImGui::PushItemWidth(window_width - settings_sliders_left);
-    m_imgui->slider_float("##offset", &offset, offset_min, offset_max, "%.1f mm", 1.0f, true, _L(opts[0].second->tooltip));
-
-    bool slider_clicked = m_imgui->get_last_slider_status().clicked; // someone clicked the slider
-    bool slider_edited =m_imgui->get_last_slider_status().edited; // someone is dragging the slider
-    bool slider_released =m_imgui->get_last_slider_status().deactivated_after_edit; // someone has just released the slider
-
-    if (current_mode >= quality_mode) {
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("quality"));
-        ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);
-        m_imgui->slider_float("##quality", &quality, quality_min, quality_max, "%.1f", 1.0f, true, _L(opts[1].second->tooltip));
-
-        slider_clicked |= m_imgui->get_last_slider_status().clicked;
-        slider_edited |= m_imgui->get_last_slider_status().edited;
-        slider_released |= m_imgui->get_last_slider_status().deactivated_after_edit;
-    }
-
-    if (current_mode >= closing_d_mode) {
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("closing_distance"));
-        ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);
-        m_imgui->slider_float("##closing_distance", &closing_d, closing_d_min, closing_d_max, "%.1f mm", 1.0f, true, _L(opts[2].second->tooltip));
-
-        slider_clicked |= m_imgui->get_last_slider_status().clicked;
-        slider_edited |= m_imgui->get_last_slider_status().edited;
-        slider_released |= m_imgui->get_last_slider_status().deactivated_after_edit;
-    }
-
-    if (slider_clicked) {
-        m_offset_stash = offset;
-        m_quality_stash = quality;
-        m_closing_d_stash = closing_d;
-    }
-    if (slider_edited || slider_released) {
-        if (slider_released) {
-            mo->config.set("hollowing_min_thickness", m_offset_stash);
-            mo->config.set("hollowing_quality", m_quality_stash);
-            mo->config.set("hollowing_closing_distance", m_closing_d_stash);
-            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Hollowing parameter change")));
-        }
-        mo->config.set("hollowing_min_thickness", offset);
-        mo->config.set("hollowing_quality", quality);
-        mo->config.set("hollowing_closing_distance", closing_d);
-        if (slider_released) {
-            wxGetApp().obj_list()->update_and_show_object_settings_item();
-            config_changed = true;
-        }
-    }
-
-    m_imgui->disabled_end();
-
-    bool force_refresh = false;
-    bool remove_selected = false;
-    bool remove_all = false;
-
-    ImGui::Separator();
-
-    float diameter_upper_cap = 60.;
-    if (m_new_hole_radius * 2.f > diameter_upper_cap)
-        m_new_hole_radius = diameter_upper_cap / 2.f;
-    ImGui::AlignTextToFramePadding();
-    m_imgui->text(m_desc.at("hole_diameter"));
-    ImGui::SameLine(diameter_slider_left, m_imgui->get_item_spacing().x);
-    ImGui::PushItemWidth(window_width - diameter_slider_left);
-
-    float diam = 2.f * m_new_hole_radius;
-    m_imgui->slider_float("##hole_diameter", &diam, 1.f, 25.f, "%.1f mm", 1.f, false);
-    // Let's clamp the value (which could have been entered by keyboard) to a larger range
-    // than the slider. This allows entering off-scale values and still protects against
-    //complete non-sense.
-    diam = std::clamp(diam, 0.1f, diameter_upper_cap);
-    m_new_hole_radius = diam / 2.f;
-    bool clicked = m_imgui->get_last_slider_status().clicked;
-    bool edited = m_imgui->get_last_slider_status().edited;
-    bool deactivated = m_imgui->get_last_slider_status().deactivated_after_edit;
-
-    ImGui::AlignTextToFramePadding();
-    m_imgui->text(m_desc["hole_depth"]);
-    ImGui::SameLine(diameter_slider_left, m_imgui->get_item_spacing().x);
-    m_imgui->slider_float("##hole_depth", &m_new_hole_height, 0.f, 10.f, "%.1f mm", 1.f, false);
-    // Same as above:
-    m_new_hole_height = std::clamp(m_new_hole_height, 0.f, 100.f);
-
-    clicked |= m_imgui->get_last_slider_status().clicked;
-    edited |= m_imgui->get_last_slider_status().edited;
-    deactivated |= m_imgui->get_last_slider_status().deactivated_after_edit;;
-
-    // Following is a nasty way to:
-    //  - save the initial value of the slider before one starts messing with it
-    //  - keep updating the head radius during sliding so it is continuosly refreshed in 3D scene
-    //  - take correct undo/redo snapshot after the user is done with moving the slider
-    if (! m_selection_empty) {
-        if (clicked) {
-            m_holes_stash = mo->sla_drain_holes;
-        }
-        if (edited) {
-            for (size_t idx=0; idx<m_selected.size(); ++idx)
-                if (m_selected[idx]) {
-                    mo->sla_drain_holes[idx].radius = m_new_hole_radius;
-                    mo->sla_drain_holes[idx].height = m_new_hole_height;
-                }
-        }
-        if (deactivated) {
-            // momentarily restore the old value to take snapshot
-            sla::DrainHoles new_holes = mo->sla_drain_holes;
-            mo->sla_drain_holes = m_holes_stash;
-            float backup_rad = m_new_hole_radius;
-            float backup_hei = m_new_hole_height;
-            for (size_t i=0; i<m_holes_stash.size(); ++i) {
-                if (m_selected[i]) {
-                    m_new_hole_radius = m_holes_stash[i].radius;
-                    m_new_hole_height = m_holes_stash[i].height;
-                    break;
-                }
-            }
-            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Change drainage hole diameter")));
-            m_new_hole_radius = backup_rad;
-            m_new_hole_height = backup_hei;
-            mo->sla_drain_holes = new_holes;
-        }
-    }
-
-    m_imgui->disabled_begin(m_selection_empty);
-    remove_selected = m_imgui->button(m_desc.at("remove_selected"));
-    m_imgui->disabled_end();
-
-    m_imgui->disabled_begin(mo->sla_drain_holes.empty());
-    remove_all = m_imgui->button(m_desc.at("remove_all"));
-    m_imgui->disabled_end();
-
-    // Following is rendered in both editing and non-editing mode:
-   // m_imgui->text("");
-    ImGui::Separator();
-    if (m_c->object_clipper()->get_position() == 0.f) {
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("clipping_of_view"));
-    }
-    else {
-        if (m_imgui->button(m_desc.at("reset_direction"))) {
-            wxGetApp().CallAfter([this](){
-                    m_c->object_clipper()->set_position(-1., false);
-                });
-        }
-    }
-
-    ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);
-    ImGui::PushItemWidth(window_width - settings_sliders_left);
-    float clp_dist = m_c->object_clipper()->get_position();
-    if (m_imgui->slider_float("##clp_dist", &clp_dist, 0.f, 1.f, "%.2f"))
-        m_c->object_clipper()->set_position(clp_dist, true);
-
-    // make sure supports are shown/hidden as appropriate
-    bool show_sups = m_c->instances_hider()->are_supports_shown();
-    if (m_imgui->checkbox(m_desc["show_supports"], show_sups)) {
-        m_c->instances_hider()->show_supports(show_sups);
-        force_refresh = true;
-    }
-
-    m_imgui->end();
-
-
-    if (remove_selected || remove_all) {
-        force_refresh = false;
-        m_parent.set_as_dirty();
-
-        if (remove_all) {
-            select_point(AllPoints);
-            delete_selected_points();
-        }
-        if (remove_selected)
-            delete_selected_points();
-
-        if (first_run) {
-            first_run = false;
-            goto RENDER_AGAIN;
-        }
-    }
-
-    if (force_refresh)
-        m_parent.set_as_dirty();
-
-    if (config_changed)
-        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_FORCE_UPDATE));
-}
-
-bool GLGizmoHollow::on_is_activable() const
-{
-    const Selection& selection = m_parent.get_selection();
-
-    if (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() != ptSLA
-        || !selection.is_from_single_instance())
-        return false;
-
-    // Check that none of the selected volumes is outside. Only SLA auxiliaries (supports) are allowed outside.
-    const Selection::IndicesList& list = selection.get_volume_idxs();
-    for (const auto& idx : list)
-        if (selection.get_volume(idx)->is_outside && selection.get_volume(idx)->composite_id.volume_id >= 0)
-            return false;
-
-    return true;
-}
-
-bool GLGizmoHollow::on_is_selectable() const
-{
-    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptSLA);
-}
-
-std::string GLGizmoHollow::on_get_name() const
-{
-    return _u8L("Hollow and drill");
-}
-
-
-CommonGizmosDataID GLGizmoHollow::on_get_requirements() const
-{
-    return CommonGizmosDataID(
-                int(CommonGizmosDataID::SelectionInfo)
-              | int(CommonGizmosDataID::InstancesHider)
-              | int(CommonGizmosDataID::Raycaster)
-              | int(CommonGizmosDataID::HollowedMesh)
-              | int(CommonGizmosDataID::ObjectClipper)
-              | int(CommonGizmosDataID::SupportsClipper));
-}
-
-
-void GLGizmoHollow::on_set_state()
-{
-    if (m_state == m_old_state)
-        return;
-
-    if (m_state == Off && m_old_state != Off) // the gizmo was just turned Off
-        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_FORCE_UPDATE));
-    m_old_state = m_state;
-}
-
-
-
-void GLGizmoHollow::on_start_dragging()
-{
-    if (m_hover_id != -1) {
-        select_point(NoPoints);
-        select_point(m_hover_id);
-        m_hole_before_drag = m_c->selection_info()->model_object()->sla_drain_holes[m_hover_id].pos;
-    }
-    else
-        m_hole_before_drag = Vec3f::Zero();
-}
-
-
-void GLGizmoHollow::on_stop_dragging()
-{
-    sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;
-    if (m_hover_id != -1) {
-        Vec3f backup = drain_holes[m_hover_id].pos;
-
-        if (m_hole_before_drag != Vec3f::Zero() // some point was touched
-         && backup != m_hole_before_drag) // and it was moved, not just selected
-        {
-            drain_holes[m_hover_id].pos = m_hole_before_drag;
-            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Move drainage hole")));
-            drain_holes[m_hover_id].pos = backup;
-        }
-    }
-    m_hole_before_drag = Vec3f::Zero();
-}
-
-
-void GLGizmoHollow::on_dragging(const UpdateData &data)
-{
-    assert(m_hover_id != -1);
-    std::pair<Vec3f, Vec3f> pos_and_normal;
-    if (!unproject_on_mesh(data.mouse_pos.cast<double>(), pos_and_normal))
-        return;
-    sla::DrainHoles &drain_holes =  m_c->selection_info()->model_object()->sla_drain_holes;
-    drain_holes[m_hover_id].pos    = pos_and_normal.first;
-    drain_holes[m_hover_id].normal = -pos_and_normal.second;
-}
-
-
-void GLGizmoHollow::on_load(cereal::BinaryInputArchive& ar)
-{
-    ar(m_new_hole_radius,
-       m_new_hole_height,
-       m_selected,
-       m_selection_empty
-    );
-}
-
-
-
-void GLGizmoHollow::on_save(cereal::BinaryOutputArchive& ar) const
-{
-    ar(m_new_hole_radius,
-       m_new_hole_height,
-       m_selected,
-       m_selection_empty
-    );
-}
-
-
-
-void GLGizmoHollow::select_point(int i)
-{
-    const sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;
-
-    if (i == AllPoints || i == NoPoints) {
-        m_selected.assign(m_selected.size(), i == AllPoints);
-        m_selection_empty = (i == NoPoints);
-
-        if (i == AllPoints) {
-            m_new_hole_radius = drain_holes[0].radius;
-            m_new_hole_height = drain_holes[0].height;
-        }
-    }
-    else {
-        while (size_t(i) >= m_selected.size())
-            m_selected.push_back(false);
-        m_selected[i] = true;
-        m_selection_empty = false;
-        m_new_hole_radius = drain_holes[i].radius;
-        m_new_hole_height = drain_holes[i].height;
-    }
-}
-
-
-void GLGizmoHollow::unselect_point(int i)
-{
-    m_selected[i] = false;
-    m_selection_empty = true;
-    for (const bool sel : m_selected) {
-        if (sel) {
-            m_selection_empty = false;
-            break;
-        }
-    }
-}
-
-void GLGizmoHollow::reload_cache()
-{
-    m_selected.clear();
-    m_selected.assign(m_c->selection_info()->model_object()->sla_drain_holes.size(), false);
-}
-
-
-void GLGizmoHollow::on_set_hover_id()
-{
-    if (int(m_c->selection_info()->model_object()->sla_drain_holes.size()) <= m_hover_id)
-        m_hover_id = -1;
-}
-
-
-
-
-} // namespace GUI
-} // namespace Slic3r
+#include "GLGizmoHollow.hpp"

+#include "slic3r/GUI/GLCanvas3D.hpp"

+#include "slic3r/GUI/Camera.hpp"

+#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"

+

+#include <GL/glew.h>

+

+#include "slic3r/GUI/GUI_App.hpp"

+#include "slic3r/GUI/GUI_ObjectSettings.hpp"

+#include "slic3r/GUI/GUI_ObjectList.hpp"

+#include "slic3r/GUI/Plater.hpp"

+#include "libslic3r/PresetBundle.hpp"

+

+#include "libslic3r/Model.hpp"

+

+

+namespace Slic3r {

+namespace GUI {

+

+GLGizmoHollow::GLGizmoHollow(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)

+    : GLGizmoBase(parent, icon_filename, sprite_id)

+{

+}

+

+

+bool GLGizmoHollow::on_init()

+{

+    m_shortcut_key = WXK_CONTROL_H;

+    m_desc["enable"]           = _(L("Hollow this object"));

+    m_desc["preview"]          = _(L("Preview hollowed and drilled model"));

+    m_desc["offset"]           = _(L("Offset")) + ": ";

+    m_desc["quality"]          = _(L("Quality")) + ": ";

+    m_desc["closing_distance"] = _(L("Closing distance")) + ": ";

+    m_desc["hole_diameter"]    = _(L("Hole diameter")) + ": ";

+    m_desc["hole_depth"]       = _(L("Hole depth")) + ": ";

+    m_desc["remove_selected"]  = _(L("Remove selected holes"));

+    m_desc["remove_all"]       = _(L("Remove all holes"));

+    m_desc["clipping_of_view"] = _(L("Clipping of view"))+ ": ";

+    m_desc["reset_direction"]  = _(L("Reset direction"));

+    m_desc["show_supports"]    = _(L("Show supports"));

+

+    return true;

+}

+

+void GLGizmoHollow::data_changed()

+{

+    if (! m_c->selection_info())

+        return;

+

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    if (m_state == On && mo) {

+        if (m_old_mo_id != mo->id()) {

+            reload_cache();

+            m_old_mo_id = mo->id();

+        }

+        if (m_c->hollowed_mesh() && m_c->hollowed_mesh()->get_hollowed_mesh())

+            m_holes_in_drilled_mesh = mo->sla_drain_holes;

+    }

+}

+

+

+

+void GLGizmoHollow::on_render()

+{

+    if (!m_cylinder.is_initialized())

+        m_cylinder.init_from(its_make_cylinder(1.0, 1.0));

+

+    const Selection& selection = m_parent.get_selection();

+    const CommonGizmosDataObjects::SelectionInfo* sel_info = m_c->selection_info();

+

+    // If current m_c->m_model_object does not match selection, ask GLCanvas3D to turn us off

+    if (m_state == On

+     && (sel_info->model_object() != selection.get_model()->objects[selection.get_object_idx()]

+      || sel_info->get_active_instance() != selection.get_instance_idx())) {

+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_RESETGIZMOS));

+        return;

+    }

+

+    glsafe(::glEnable(GL_BLEND));

+    glsafe(::glEnable(GL_DEPTH_TEST));

+

+    if (selection.is_from_single_instance())

+        render_points(selection, false);

+

+    m_selection_rectangle.render(m_parent);

+    m_c->object_clipper()->render_cut();

+    m_c->supports_clipper()->render_cut();

+

+    glsafe(::glDisable(GL_BLEND));

+}

+

+

+void GLGizmoHollow::on_render_for_picking()

+{

+    const Selection& selection = m_parent.get_selection();

+//#if ENABLE_RENDER_PICKING_PASS

+//    m_z_shift = selection.get_volume(*selection.get_volume_idxs().begin())->get_sla_shift_z();

+//#endif

+

+    glsafe(::glEnable(GL_DEPTH_TEST));

+    render_points(selection, true);

+}

+

+void GLGizmoHollow::render_points(const Selection& selection, bool picking)

+{

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLShaderProgram* shader = picking ? wxGetApp().get_shader("flat") : wxGetApp().get_shader("gouraud_light");

+    if (shader == nullptr)

+        return;

+

+    shader->start_using();

+    ScopeGuard guard([shader]() { shader->stop_using(); });

+#else

+    GLShaderProgram* shader = picking ? nullptr : wxGetApp().get_shader("gouraud_light");

+    if (shader)

+        shader->start_using();

+    ScopeGuard guard([shader]() { if (shader) shader->stop_using(); });

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    const GLVolume* vol = selection.get_volume(*selection.get_volume_idxs().begin());

+    Geometry::Transformation trafo =  vol->get_instance_transformation() * vol->get_volume_transformation();

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d instance_scaling_matrix_inverse = vol->get_instance_transformation().get_scaling_factor_matrix().inverse();

+#else

+    const Transform3d instance_scaling_matrix_inverse = vol->get_instance_transformation().get_matrix(true, true, false, true).inverse();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d instance_matrix = Geometry::assemble_transform(m_c->selection_info()->get_sla_shift() * Vec3d::UnitZ()) * trafo.get_matrix();

+

+    const Camera& camera = wxGetApp().plater()->get_camera();

+    const Transform3d& view_matrix = camera.get_view_matrix();

+    const Transform3d& projection_matrix = camera.get_projection_matrix();

+

+    shader->set_uniform("projection_matrix", projection_matrix);

+#else

+    const Transform3d& instance_scaling_matrix_inverse = trafo.get_matrix(true, true, false, true).inverse();

+    const Transform3d& instance_matrix = trafo.get_matrix();

+

+    glsafe(::glPushMatrix());

+    glsafe(::glTranslated(0.0, 0.0, m_c->selection_info()->get_sla_shift()));

+    glsafe(::glMultMatrixd(instance_matrix.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+    ColorRGBA render_color;

+    const sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;

+    const size_t cache_size = drain_holes.size();

+

+    for (size_t i = 0; i < cache_size; ++i) {

+        const sla::DrainHole& drain_hole = drain_holes[i];

+        const bool point_selected = m_selected[i];

+

+        if (is_mesh_point_clipped(drain_hole.pos.cast<double>()))

+            continue;

+

+        // First decide about the color of the point.

+        if (picking)

+            render_color = picking_color_component(i);

+        else {

+            if (size_t(m_hover_id) == i)

+                render_color = ColorRGBA::CYAN();

+            else if (m_c->hollowed_mesh() &&

+                       i < m_c->hollowed_mesh()->get_drainholes().size() &&

+                       m_c->hollowed_mesh()->get_drainholes()[i].failed) {

+                render_color = { 1.0f, 0.0f, 0.0f, 0.5f };

+            }

+            else  // neither hover nor picking

+                render_color = point_selected ? ColorRGBA(1.0f, 0.3f, 0.3f, 0.5f) : ColorRGBA(1.0f, 1.0f, 1.0f, 0.5f);

+        }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        m_cylinder.set_color(render_color);

+#else

+        const_cast<GLModel*>(&m_cylinder)->set_color(-1, render_color);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+        // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Transform3d hole_matrix = Geometry::assemble_transform(drain_hole.pos.cast<double>()) * instance_scaling_matrix_inverse;

+#else

+        glsafe(::glPushMatrix());

+        glsafe(::glTranslatef(drain_hole.pos.x(), drain_hole.pos.y(), drain_hole.pos.z()));

+        glsafe(::glMultMatrixd(instance_scaling_matrix_inverse.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+        if (vol->is_left_handed())

+            glFrontFace(GL_CW);

+

+        // Matrices set, we can render the point mark now.

+        Eigen::Quaterniond q;

+        q.setFromTwoVectors(Vec3d::UnitZ(), instance_scaling_matrix_inverse * (-drain_hole.normal).cast<double>());

+        const Eigen::AngleAxisd aa(q);

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Transform3d view_model_matrix = view_matrix * instance_matrix * hole_matrix * Transform3d(aa.toRotationMatrix()) *

+            Geometry::assemble_transform(-drain_hole.height * Vec3d::UnitZ(), Vec3d::Zero(), Vec3d(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));

+

+        shader->set_uniform("view_model_matrix", view_model_matrix);

+        shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());

+#else

+        glsafe(::glRotated(aa.angle() * (180. / M_PI), aa.axis().x(), aa.axis().y(), aa.axis().z()));

+        glsafe(::glTranslated(0., 0., -drain_hole.height));

+        glsafe(::glScaled(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        m_cylinder.render();

+

+        if (vol->is_left_handed())

+            glFrontFace(GL_CCW);

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+            glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+    }

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+        glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+}

+

+bool GLGizmoHollow::is_mesh_point_clipped(const Vec3d& point) const

+{

+    if (m_c->object_clipper()->get_position() == 0.)

+        return false;

+

+    auto sel_info = m_c->selection_info();

+    int active_inst = m_c->selection_info()->get_active_instance();

+    const ModelInstance* mi = sel_info->model_object()->instances[active_inst];

+    const Transform3d& trafo = mi->get_transformation().get_matrix() * sel_info->model_object()->volumes.front()->get_matrix();

+

+    Vec3d transformed_point =  trafo * point;

+    transformed_point(2) += sel_info->get_sla_shift();

+    return m_c->object_clipper()->get_clipping_plane()->is_point_clipped(transformed_point);

+}

+

+

+

+// Unprojects the mouse position on the mesh and saves hit point and normal of the facet into pos_and_normal

+// Return false if no intersection was found, true otherwise.

+bool GLGizmoHollow::unproject_on_mesh(const Vec2d& mouse_pos, std::pair<Vec3f, Vec3f>& pos_and_normal)

+{

+    if (! m_c->raycaster()->raycaster())

+        return false;

+

+    const Camera& camera = wxGetApp().plater()->get_camera();

+    const Selection& selection = m_parent.get_selection();

+    const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());

+    Geometry::Transformation trafo = volume->get_instance_transformation() * volume->get_volume_transformation();

+    trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));

+

+    double clp_dist = m_c->object_clipper()->get_position();

+    const ClippingPlane* clp = m_c->object_clipper()->get_clipping_plane();

+

+    // The raycaster query

+    Vec3f hit;

+    Vec3f normal;

+    if (m_c->raycaster()->raycaster()->unproject_on_mesh(

+            mouse_pos,

+            trafo.get_matrix(),

+            camera,

+            hit,

+            normal,

+            clp_dist != 0. ? clp : nullptr))

+    {

+        if (m_c->hollowed_mesh() && m_c->hollowed_mesh()->get_hollowed_mesh()) {

+            // in this case the raycaster sees the hollowed and drilled mesh.

+            // if the point lies on the surface created by the hole, we want

+            // to ignore it.

+            for (const sla::DrainHole& hole : m_holes_in_drilled_mesh) {

+                sla::DrainHole outer(hole);

+                outer.radius *= 1.001f;

+                outer.height *= 1.001f;

+                if (outer.is_inside(hit))

+                    return false;

+            }

+        }

+

+        // Return both the point and the facet normal.

+        pos_and_normal = std::make_pair(hit, normal);

+        return true;

+    }

+    else

+        return false;

+}

+

+// Following function is called from GLCanvas3D to inform the gizmo about a mouse/keyboard event.

+// The gizmo has an opportunity to react - if it does, it should return true so that the Canvas3D is

+// aware that the event was reacted to and stops trying to make different sense of it. If the gizmo

+// concludes that the event was not intended for it, it should return false.

+bool GLGizmoHollow::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)

+{

+    ModelObject* mo = m_c->selection_info()->model_object();

+    int active_inst = m_c->selection_info()->get_active_instance();

+

+

+    // left down with shift - show the selection rectangle:

+    if (action == SLAGizmoEventType::LeftDown && (shift_down || alt_down || control_down)) {

+        if (m_hover_id == -1) {

+            if (shift_down || alt_down) {

+                m_selection_rectangle.start_dragging(mouse_position, shift_down ? GLSelectionRectangle::EState::Select : GLSelectionRectangle::EState::Deselect);

+            }

+        }

+        else {

+            if (m_selected[m_hover_id])

+                unselect_point(m_hover_id);

+            else {

+                if (!alt_down)

+                    select_point(m_hover_id);

+            }

+        }

+

+        return true;

+    }

+

+    // left down without selection rectangle - place point on the mesh:

+    if (action == SLAGizmoEventType::LeftDown && !m_selection_rectangle.is_dragging() && !shift_down) {

+        // If any point is in hover state, this should initiate its move - return control back to GLCanvas:

+        if (m_hover_id != -1)

+            return false;

+

+        // If there is some selection, don't add new point and deselect everything instead.

+        if (m_selection_empty) {

+            std::pair<Vec3f, Vec3f> pos_and_normal;

+            if (unproject_on_mesh(mouse_position, pos_and_normal)) { // we got an intersection

+                Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Add drainage hole")));

+

+                mo->sla_drain_holes.emplace_back(pos_and_normal.first,

+                                                -pos_and_normal.second, m_new_hole_radius, m_new_hole_height);

+                m_selected.push_back(false);

+                assert(m_selected.size() == mo->sla_drain_holes.size());

+                m_parent.set_as_dirty();

+                m_wait_for_up_event = true;

+            }

+            else

+                return false;

+        }

+        else

+            select_point(NoPoints);

+

+        return true;

+    }

+

+    // left up with selection rectangle - select points inside the rectangle:

+    if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::ShiftUp || action == SLAGizmoEventType::AltUp) && m_selection_rectangle.is_dragging()) {

+        // Is this a selection or deselection rectangle?

+        GLSelectionRectangle::EState rectangle_status = m_selection_rectangle.get_state();

+

+        // First collect positions of all the points in world coordinates.

+        Geometry::Transformation trafo = mo->instances[active_inst]->get_transformation();

+        trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));

+        std::vector<Vec3d> points;

+        for (unsigned int i=0; i<mo->sla_drain_holes.size(); ++i)

+            points.push_back(trafo.get_matrix() * mo->sla_drain_holes[i].pos.cast<double>());

+

+        // Now ask the rectangle which of the points are inside.

+        std::vector<Vec3f> points_inside;

+        std::vector<unsigned int> points_idxs = m_selection_rectangle.stop_dragging(m_parent, points);

+        for (size_t idx : points_idxs)

+            points_inside.push_back(points[idx].cast<float>());

+

+        // Only select/deselect points that are actually visible

+        for (size_t idx : m_c->raycaster()->raycaster()->get_unobscured_idxs(

+                 trafo, wxGetApp().plater()->get_camera(), points_inside,

+                 m_c->object_clipper()->get_clipping_plane()))

+        {

+            if (rectangle_status == GLSelectionRectangle::EState::Deselect)

+                unselect_point(points_idxs[idx]);

+            else

+                select_point(points_idxs[idx]);

+        }

+        return true;

+    }

+

+    // left up with no selection rectangle

+    if (action == SLAGizmoEventType::LeftUp) {

+        if (m_wait_for_up_event) {

+            m_wait_for_up_event = false;

+            return true;

+        }

+    }

+

+    // dragging the selection rectangle:

+    if (action == SLAGizmoEventType::Dragging) {

+        if (m_wait_for_up_event)

+            return true; // point has been placed and the button not released yet

+                         // this prevents GLCanvas from starting scene rotation

+

+        if (m_selection_rectangle.is_dragging())  {

+            m_selection_rectangle.dragging(mouse_position);

+            return true;

+        }

+

+        return false;

+    }

+

+    if (action == SLAGizmoEventType::Delete) {

+        // delete key pressed

+        delete_selected_points();

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::RightDown) {

+        if (m_hover_id != -1) {

+            select_point(NoPoints);

+            select_point(m_hover_id);

+            delete_selected_points();

+            return true;

+        }

+        return false;

+    }

+

+    if (action == SLAGizmoEventType::SelectAll) {

+        select_point(AllPoints);

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::MouseWheelUp && control_down) {

+        double pos = m_c->object_clipper()->get_position();

+        pos = std::min(1., pos + 0.01);

+        m_c->object_clipper()->set_position(pos, true);

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::MouseWheelDown && control_down) {

+        double pos = m_c->object_clipper()->get_position();

+        pos = std::max(0., pos - 0.01);

+        m_c->object_clipper()->set_position(pos, true);

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::ResetClippingPlane) {

+        m_c->object_clipper()->set_position(-1., false);

+        return true;

+    }

+

+    return false;

+}

+

+void GLGizmoHollow::delete_selected_points()

+{

+    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Delete drainage hole")));

+    sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;

+

+    for (unsigned int idx=0; idx<drain_holes.size(); ++idx) {

+        if (m_selected[idx]) {

+            m_selected.erase(m_selected.begin()+idx);

+            drain_holes.erase(drain_holes.begin() + (idx--));

+        }

+    }

+

+    select_point(NoPoints);

+}

+

+bool GLGizmoHollow::on_mouse(const wxMouseEvent &mouse_event)

+{

+    if (mouse_event.Moving()) return false;

+    if (use_grabbers(mouse_event)) return true;

+

+    // wxCoord == int --> wx/types.h

+    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());

+    Vec2d mouse_pos = mouse_coord.cast<double>();

+

+    static bool pending_right_up = false;

+    if (mouse_event.LeftDown()) {

+        bool control_down = mouse_event.CmdDown();

+        bool grabber_contains_mouse = (get_hover_id() != -1);

+        if ((!control_down || grabber_contains_mouse) &&

+            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))

+            // the gizmo got the event and took some action, there is no need

+            // to do anything more

+            return true;

+    } else if (mouse_event.Dragging()) {

+        if (m_parent.get_move_volume_id() != -1)

+            // don't allow dragging objects with the Sla gizmo on

+            return true;

+

+        bool control_down = mouse_event.CmdDown();

+        if (control_down) {

+            // CTRL has been pressed while already dragging -> stop current action

+            if (mouse_event.LeftIsDown())

+                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);

+            else if (mouse_event.RightIsDown()) {

+                pending_right_up = false;

+            }

+        } else if(gizmo_event(SLAGizmoEventType::Dragging, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false)) {

+            // the gizmo got the event and took some action, no need to do

+            // anything more here

+            m_parent.set_as_dirty();

+            return true;

+        }

+    } else if (mouse_event.LeftUp()) {    

+        if (!m_parent.is_mouse_dragging()) {

+            bool control_down = mouse_event.CmdDown();

+            // in case gizmo is selected, we just pass the LeftUp event

+            // and stop processing - neither object moving or selecting is

+            // suppressed in that case

+            gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), control_down);

+            return true;

+        }

+    } else if (mouse_event.RightDown()) {

+        if (m_parent.get_selection().get_object_idx() != -1 &&

+            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) {

+            // we need to set the following right up as processed to avoid showing

+            // the context menu if the user release the mouse over the object

+            pending_right_up = true;

+            // event was taken care of by the SlaSupports gizmo

+            return true;

+        }

+    } else if (mouse_event.RightUp()) {

+        if (pending_right_up) {

+            pending_right_up = false;

+            return true;

+        }

+    }

+    return false;

+}

+

+void GLGizmoHollow::hollow_mesh(bool postpone_error_messages)

+{

+    wxGetApp().CallAfter([this, postpone_error_messages]() {

+        wxGetApp().plater()->reslice_SLA_hollowing(

+            *m_c->selection_info()->model_object(), postpone_error_messages);

+    });

+}

+

+

+std::vector<std::pair<const ConfigOption*, const ConfigOptionDef*>>

+GLGizmoHollow::get_config_options(const std::vector<std::string>& keys) const

+{

+    std::vector<std::pair<const ConfigOption*, const ConfigOptionDef*>> out;

+    const ModelObject* mo = m_c->selection_info()->model_object();

+

+    if (! mo)

+        return out;

+

+    const DynamicPrintConfig& object_cfg = mo->config.get();

+    const DynamicPrintConfig& print_cfg = wxGetApp().preset_bundle->sla_prints.get_edited_preset().config;

+    std::unique_ptr<DynamicPrintConfig> default_cfg = nullptr;

+

+    for (const std::string& key : keys) {

+        if (object_cfg.has(key))

+            out.emplace_back(object_cfg.option(key), &object_cfg.def()->options.at(key)); // at() needed for const map

+        else

+            if (print_cfg.has(key))

+                out.emplace_back(print_cfg.option(key), &print_cfg.def()->options.at(key));

+            else { // we must get it from defaults

+                if (default_cfg == nullptr)

+                    default_cfg.reset(DynamicPrintConfig::new_from_defaults_keys(keys));

+                out.emplace_back(default_cfg->option(key), &default_cfg->def()->options.at(key));

+            }

+    }

+

+    return out;

+}

+

+

+void GLGizmoHollow::on_render_input_window(float x, float y, float bottom_limit)

+{

+    ModelObject* mo = m_c->selection_info()->model_object();

+    if (! mo)

+        return;

+

+    bool first_run = true; // This is a hack to redraw the button when all points are removed,

+                           // so it is not delayed until the background process finishes.

+

+    ConfigOptionMode current_mode = wxGetApp().get_mode();

+

+    std::vector<std::string> opts_keys = {"hollowing_min_thickness", "hollowing_quality", "hollowing_closing_distance"};

+    auto opts = get_config_options(opts_keys);

+    auto* offset_cfg = static_cast<const ConfigOptionFloat*>(opts[0].first);

+    float offset = offset_cfg->value;

+    double offset_min = opts[0].second->min;

+    double offset_max = opts[0].second->max;

+

+    auto* quality_cfg = static_cast<const ConfigOptionFloat*>(opts[1].first);

+    float quality = quality_cfg->value;

+    double quality_min = opts[1].second->min;

+    double quality_max = opts[1].second->max;

+    ConfigOptionMode quality_mode = opts[1].second->mode;

+

+    auto* closing_d_cfg = static_cast<const ConfigOptionFloat*>(opts[2].first);

+    float closing_d = closing_d_cfg->value;

+    double closing_d_min = opts[2].second->min;

+    double closing_d_max = opts[2].second->max;

+    ConfigOptionMode closing_d_mode = opts[2].second->mode;

+

+    m_desc["offset"] = _(opts[0].second->label) + ":";

+    m_desc["quality"] = _(opts[1].second->label) + ":";

+    m_desc["closing_distance"] = _(opts[2].second->label) + ":";

+

+

+RENDER_AGAIN:

+    const float approx_height = m_imgui->scaled(20.0f);

+    y = std::min(y, bottom_limit - approx_height);

+    m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);

+

+    m_imgui->begin(get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);

+

+    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:

+    const float clipping_slider_left = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x,

+                                                m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(0.5f);

+

+    const float settings_sliders_left =

+        std::max(std::max({m_imgui->calc_text_size(m_desc.at("offset")).x,

+                           m_imgui->calc_text_size(m_desc.at("quality")).x,

+                           m_imgui->calc_text_size(m_desc.at("closing_distance")).x,

+                           m_imgui->calc_text_size(m_desc.at("hole_diameter")).x,

+                           m_imgui->calc_text_size(m_desc.at("hole_depth")).x}) + m_imgui->scaled(0.5f), clipping_slider_left);

+

+    const float diameter_slider_left = settings_sliders_left; //m_imgui->calc_text_size(m_desc.at("hole_diameter")).x + m_imgui->scaled(1.f);

+    const float minimal_slider_width = m_imgui->scaled(4.f);

+

+    const float button_preview_width = m_imgui->calc_button_size(m_desc.at("preview")).x;

+

+    float window_width = minimal_slider_width + std::max({settings_sliders_left, clipping_slider_left, diameter_slider_left});

+    window_width = std::max(window_width, button_preview_width);

+

+    if (m_imgui->button(m_desc["preview"]))

+        hollow_mesh();

+    

+    bool config_changed = false;

+

+    ImGui::Separator();

+

+    {

+        auto opts = get_config_options({"hollowing_enable"});

+        m_enable_hollowing = static_cast<const ConfigOptionBool*>(opts[0].first)->value;

+        if (m_imgui->checkbox(m_desc["enable"], m_enable_hollowing)) {

+            mo->config.set("hollowing_enable", m_enable_hollowing);

+            wxGetApp().obj_list()->update_and_show_object_settings_item();

+            config_changed = true;

+        }

+    }

+

+    m_imgui->disabled_begin(! m_enable_hollowing);

+    ImGui::AlignTextToFramePadding();

+    m_imgui->text(m_desc.at("offset"));

+    ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);

+    ImGui::PushItemWidth(window_width - settings_sliders_left);

+    m_imgui->slider_float("##offset", &offset, offset_min, offset_max, "%.1f mm", 1.0f, true, _L(opts[0].second->tooltip));

+

+    bool slider_clicked = m_imgui->get_last_slider_status().clicked; // someone clicked the slider

+    bool slider_edited =m_imgui->get_last_slider_status().edited; // someone is dragging the slider

+    bool slider_released =m_imgui->get_last_slider_status().deactivated_after_edit; // someone has just released the slider

+

+    if (current_mode >= quality_mode) {

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("quality"));

+        ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);

+        m_imgui->slider_float("##quality", &quality, quality_min, quality_max, "%.1f", 1.0f, true, _L(opts[1].second->tooltip));

+

+        slider_clicked |= m_imgui->get_last_slider_status().clicked;

+        slider_edited |= m_imgui->get_last_slider_status().edited;

+        slider_released |= m_imgui->get_last_slider_status().deactivated_after_edit;

+    }

+

+    if (current_mode >= closing_d_mode) {

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("closing_distance"));

+        ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);

+        m_imgui->slider_float("##closing_distance", &closing_d, closing_d_min, closing_d_max, "%.1f mm", 1.0f, true, _L(opts[2].second->tooltip));

+

+        slider_clicked |= m_imgui->get_last_slider_status().clicked;

+        slider_edited |= m_imgui->get_last_slider_status().edited;

+        slider_released |= m_imgui->get_last_slider_status().deactivated_after_edit;

+    }

+

+    if (slider_clicked) {

+        m_offset_stash = offset;

+        m_quality_stash = quality;

+        m_closing_d_stash = closing_d;

+    }

+    if (slider_edited || slider_released) {

+        if (slider_released) {

+            mo->config.set("hollowing_min_thickness", m_offset_stash);

+            mo->config.set("hollowing_quality", m_quality_stash);

+            mo->config.set("hollowing_closing_distance", m_closing_d_stash);

+            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Hollowing parameter change")));

+        }

+        mo->config.set("hollowing_min_thickness", offset);

+        mo->config.set("hollowing_quality", quality);

+        mo->config.set("hollowing_closing_distance", closing_d);

+        if (slider_released) {

+            wxGetApp().obj_list()->update_and_show_object_settings_item();

+            config_changed = true;

+        }

+    }

+

+    m_imgui->disabled_end();

+

+    bool force_refresh = false;

+    bool remove_selected = false;

+    bool remove_all = false;

+

+    ImGui::Separator();

+

+    float diameter_upper_cap = 60.;

+    if (m_new_hole_radius * 2.f > diameter_upper_cap)

+        m_new_hole_radius = diameter_upper_cap / 2.f;

+    ImGui::AlignTextToFramePadding();

+    m_imgui->text(m_desc.at("hole_diameter"));

+    ImGui::SameLine(diameter_slider_left, m_imgui->get_item_spacing().x);

+    ImGui::PushItemWidth(window_width - diameter_slider_left);

+

+    float diam = 2.f * m_new_hole_radius;

+    m_imgui->slider_float("##hole_diameter", &diam, 1.f, 25.f, "%.1f mm", 1.f, false);

+    // Let's clamp the value (which could have been entered by keyboard) to a larger range

+    // than the slider. This allows entering off-scale values and still protects against

+    //complete non-sense.

+    diam = std::clamp(diam, 0.1f, diameter_upper_cap);

+    m_new_hole_radius = diam / 2.f;

+    bool clicked = m_imgui->get_last_slider_status().clicked;

+    bool edited = m_imgui->get_last_slider_status().edited;

+    bool deactivated = m_imgui->get_last_slider_status().deactivated_after_edit;

+

+    ImGui::AlignTextToFramePadding();

+    m_imgui->text(m_desc["hole_depth"]);

+    ImGui::SameLine(diameter_slider_left, m_imgui->get_item_spacing().x);

+    m_imgui->slider_float("##hole_depth", &m_new_hole_height, 0.f, 10.f, "%.1f mm", 1.f, false);

+    // Same as above:

+    m_new_hole_height = std::clamp(m_new_hole_height, 0.f, 100.f);

+

+    clicked |= m_imgui->get_last_slider_status().clicked;

+    edited |= m_imgui->get_last_slider_status().edited;

+    deactivated |= m_imgui->get_last_slider_status().deactivated_after_edit;;

+

+    // Following is a nasty way to:

+    //  - save the initial value of the slider before one starts messing with it

+    //  - keep updating the head radius during sliding so it is continuosly refreshed in 3D scene

+    //  - take correct undo/redo snapshot after the user is done with moving the slider

+    if (! m_selection_empty) {

+        if (clicked) {

+            m_holes_stash = mo->sla_drain_holes;

+        }

+        if (edited) {

+            for (size_t idx=0; idx<m_selected.size(); ++idx)

+                if (m_selected[idx]) {

+                    mo->sla_drain_holes[idx].radius = m_new_hole_radius;

+                    mo->sla_drain_holes[idx].height = m_new_hole_height;

+                }

+        }

+        if (deactivated) {

+            // momentarily restore the old value to take snapshot

+            sla::DrainHoles new_holes = mo->sla_drain_holes;

+            mo->sla_drain_holes = m_holes_stash;

+            float backup_rad = m_new_hole_radius;

+            float backup_hei = m_new_hole_height;

+            for (size_t i=0; i<m_holes_stash.size(); ++i) {

+                if (m_selected[i]) {

+                    m_new_hole_radius = m_holes_stash[i].radius;

+                    m_new_hole_height = m_holes_stash[i].height;

+                    break;

+                }

+            }

+            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Change drainage hole diameter")));

+            m_new_hole_radius = backup_rad;

+            m_new_hole_height = backup_hei;

+            mo->sla_drain_holes = new_holes;

+        }

+    }

+

+    m_imgui->disabled_begin(m_selection_empty);

+    remove_selected = m_imgui->button(m_desc.at("remove_selected"));

+    m_imgui->disabled_end();

+

+    m_imgui->disabled_begin(mo->sla_drain_holes.empty());

+    remove_all = m_imgui->button(m_desc.at("remove_all"));

+    m_imgui->disabled_end();

+

+    // Following is rendered in both editing and non-editing mode:

+   // m_imgui->text("");

+    ImGui::Separator();

+    if (m_c->object_clipper()->get_position() == 0.f) {

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("clipping_of_view"));

+    }

+    else {

+        if (m_imgui->button(m_desc.at("reset_direction"))) {

+            wxGetApp().CallAfter([this](){

+                    m_c->object_clipper()->set_position(-1., false);

+                });

+        }

+    }

+

+    ImGui::SameLine(settings_sliders_left, m_imgui->get_item_spacing().x);

+    ImGui::PushItemWidth(window_width - settings_sliders_left);

+    float clp_dist = m_c->object_clipper()->get_position();

+    if (m_imgui->slider_float("##clp_dist", &clp_dist, 0.f, 1.f, "%.2f"))

+        m_c->object_clipper()->set_position(clp_dist, true);

+

+    // make sure supports are shown/hidden as appropriate

+    bool show_sups = m_c->instances_hider()->are_supports_shown();

+    if (m_imgui->checkbox(m_desc["show_supports"], show_sups)) {

+        m_c->instances_hider()->show_supports(show_sups);

+        force_refresh = true;

+    }

+

+    m_imgui->end();

+

+

+    if (remove_selected || remove_all) {

+        force_refresh = false;

+        m_parent.set_as_dirty();

+

+        if (remove_all) {

+            select_point(AllPoints);

+            delete_selected_points();

+        }

+        if (remove_selected)

+            delete_selected_points();

+

+        if (first_run) {

+            first_run = false;

+            goto RENDER_AGAIN;

+        }

+    }

+

+    if (force_refresh)

+        m_parent.set_as_dirty();

+

+    if (config_changed)

+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_FORCE_UPDATE));

+}

+

+bool GLGizmoHollow::on_is_activable() const

+{

+    const Selection& selection = m_parent.get_selection();

+

+    if (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() != ptSLA

+        || !selection.is_from_single_instance())

+        return false;

+

+    // Check that none of the selected volumes is outside. Only SLA auxiliaries (supports) are allowed outside.

+    const Selection::IndicesList& list = selection.get_volume_idxs();

+    for (const auto& idx : list)

+        if (selection.get_volume(idx)->is_outside && selection.get_volume(idx)->composite_id.volume_id >= 0)

+            return false;

+

+    return true;

+}

+

+bool GLGizmoHollow::on_is_selectable() const

+{

+    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptSLA);

+}

+

+std::string GLGizmoHollow::on_get_name() const

+{

+    return _u8L("Hollow and drill");

+}

+

+

+CommonGizmosDataID GLGizmoHollow::on_get_requirements() const

+{

+    return CommonGizmosDataID(

+                int(CommonGizmosDataID::SelectionInfo)

+              | int(CommonGizmosDataID::InstancesHider)

+              | int(CommonGizmosDataID::Raycaster)

+              | int(CommonGizmosDataID::HollowedMesh)

+              | int(CommonGizmosDataID::ObjectClipper)

+              | int(CommonGizmosDataID::SupportsClipper));

+}

+

+

+void GLGizmoHollow::on_set_state()

+{

+    if (m_state == m_old_state)

+        return;

+

+    if (m_state == Off && m_old_state != Off) // the gizmo was just turned Off

+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_FORCE_UPDATE));

+    m_old_state = m_state;

+}

+

+

+

+void GLGizmoHollow::on_start_dragging()

+{

+    if (m_hover_id != -1) {

+        select_point(NoPoints);

+        select_point(m_hover_id);

+        m_hole_before_drag = m_c->selection_info()->model_object()->sla_drain_holes[m_hover_id].pos;

+    }

+    else

+        m_hole_before_drag = Vec3f::Zero();

+}

+

+

+void GLGizmoHollow::on_stop_dragging()

+{

+    sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;

+    if (m_hover_id != -1) {

+        Vec3f backup = drain_holes[m_hover_id].pos;

+

+        if (m_hole_before_drag != Vec3f::Zero() // some point was touched

+         && backup != m_hole_before_drag) // and it was moved, not just selected

+        {

+            drain_holes[m_hover_id].pos = m_hole_before_drag;

+            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _(L("Move drainage hole")));

+            drain_holes[m_hover_id].pos = backup;

+        }

+    }

+    m_hole_before_drag = Vec3f::Zero();

+}

+

+

+void GLGizmoHollow::on_dragging(const UpdateData &data)

+{

+    assert(m_hover_id != -1);

+    std::pair<Vec3f, Vec3f> pos_and_normal;

+    if (!unproject_on_mesh(data.mouse_pos.cast<double>(), pos_and_normal))

+        return;

+    sla::DrainHoles &drain_holes =  m_c->selection_info()->model_object()->sla_drain_holes;

+    drain_holes[m_hover_id].pos    = pos_and_normal.first;

+    drain_holes[m_hover_id].normal = -pos_and_normal.second;

+}

+

+

+void GLGizmoHollow::on_load(cereal::BinaryInputArchive& ar)

+{

+    ar(m_new_hole_radius,

+       m_new_hole_height,

+       m_selected,

+       m_selection_empty

+    );

+}

+

+

+

+void GLGizmoHollow::on_save(cereal::BinaryOutputArchive& ar) const

+{

+    ar(m_new_hole_radius,

+       m_new_hole_height,

+       m_selected,

+       m_selection_empty

+    );

+}

+

+

+

+void GLGizmoHollow::select_point(int i)

+{

+    const sla::DrainHoles& drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;

+

+    if (i == AllPoints || i == NoPoints) {

+        m_selected.assign(m_selected.size(), i == AllPoints);

+        m_selection_empty = (i == NoPoints);

+

+        if (i == AllPoints) {

+            m_new_hole_radius = drain_holes[0].radius;

+            m_new_hole_height = drain_holes[0].height;

+        }

+    }

+    else {

+        while (size_t(i) >= m_selected.size())

+            m_selected.push_back(false);

+        m_selected[i] = true;

+        m_selection_empty = false;

+        m_new_hole_radius = drain_holes[i].radius;

+        m_new_hole_height = drain_holes[i].height;

+    }

+}

+

+

+void GLGizmoHollow::unselect_point(int i)

+{

+    m_selected[i] = false;

+    m_selection_empty = true;

+    for (const bool sel : m_selected) {

+        if (sel) {

+            m_selection_empty = false;

+            break;

+        }

+    }

+}

+

+void GLGizmoHollow::reload_cache()

+{

+    m_selected.clear();

+    m_selected.assign(m_c->selection_info()->model_object()->sla_drain_holes.size(), false);

+}

+

+

+void GLGizmoHollow::on_set_hover_id()

+{

+    if (int(m_c->selection_info()->model_object()->sla_drain_holes.size()) <= m_hover_id)

+        m_hover_id = -1;

+}

+

+

+

+

+} // namespace GUI

+} // namespace Slic3r

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
index 14c41ce54..52dd207e9 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
@@ -90,32 +90,32 @@ bool GLGizmoMove3D::on_is_activable() const
 

 void GLGizmoMove3D::on_start_dragging()

 {

-    if (m_hover_id != -1) {

-        m_displacement = Vec3d::Zero();

+    assert(m_hover_id != -1);

+

+    m_displacement = Vec3d::Zero();

 #if ENABLE_WORLD_COORDINATE

-        const Selection& selection = m_parent.get_selection();

-        const ECoordinatesType coordinates_type = wxGetApp().obj_manipul()->get_coordinates_type();

-        if (coordinates_type == ECoordinatesType::World)

-            m_starting_drag_position = m_center + m_grabbers[m_hover_id].center;

-        else if (coordinates_type == ECoordinatesType::Local && selection.is_single_volume_or_modifier()) {

-            const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

-            m_starting_drag_position = m_center + Geometry::assemble_transform(Vec3d::Zero(), v.get_instance_rotation()) * Geometry::assemble_transform(Vec3d::Zero(), v.get_volume_rotation()) * m_grabbers[m_hover_id].center;

-        }

-        else {

-            const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

-            m_starting_drag_position = m_center + Geometry::assemble_transform(Vec3d::Zero(), v.get_instance_rotation()) * m_grabbers[m_hover_id].center;

-        }

-        m_starting_box_center = m_center;

-        m_starting_box_bottom_center = m_center;

-        m_starting_box_bottom_center.z() = m_bounding_box.min.z();

+    const Selection& selection = m_parent.get_selection();

+    const ECoordinatesType coordinates_type = wxGetApp().obj_manipul()->get_coordinates_type();

+    if (coordinates_type == ECoordinatesType::World)

+        m_starting_drag_position = m_center + m_grabbers[m_hover_id].center;

+    else if (coordinates_type == ECoordinatesType::Local && selection.is_single_volume_or_modifier()) {

+        const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+        m_starting_drag_position = m_center + Geometry::assemble_transform(Vec3d::Zero(), v.get_instance_rotation()) * Geometry::assemble_transform(Vec3d::Zero(), v.get_volume_rotation()) * m_grabbers[m_hover_id].center;

+    }

+    else {

+        const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+        m_starting_drag_position = m_center + Geometry::assemble_transform(Vec3d::Zero(), v.get_instance_rotation()) * m_grabbers[m_hover_id].center;

+    }

+    m_starting_box_center = m_center;

+    m_starting_box_bottom_center = m_center;

+    m_starting_box_bottom_center.z() = m_bounding_box.min.z();

 #else

-        const BoundingBoxf3& box = m_parent.get_selection().get_bounding_box();

-        m_starting_drag_position = m_grabbers[m_hover_id].center;

-        m_starting_box_center = box.center();

-        m_starting_box_bottom_center = box.center();

-        m_starting_box_bottom_center.z() = box.min.z();

+    const BoundingBoxf3& box = m_parent.get_selection().get_bounding_box();

+    m_starting_drag_position = m_grabbers[m_hover_id].center;

+    m_starting_box_center = box.center();

+    m_starting_box_bottom_center = box.center();

+    m_starting_box_bottom_center.z() = box.min.z();

 #endif // ENABLE_WORLD_COORDINATE

-    }

 }

 

 void GLGizmoMove3D::on_stop_dragging()

@@ -134,7 +134,11 @@ void GLGizmoMove3D::on_dragging(const UpdateData& data)
         m_displacement.z() = calc_projection(data);

         

     Selection &selection = m_parent.get_selection();

+#if ENABLE_WORLD_COORDINATE

+    selection.translate(m_displacement, wxGetApp().obj_manipul()->get_coordinates_type());

+#else

     selection.translate(m_displacement);

+#endif // ENABLE_WORLD_COORDINATE

 }

 

 void GLGizmoMove3D::on_render()

@@ -148,9 +152,18 @@ void GLGizmoMove3D::on_render()
     glsafe(::glEnable(GL_DEPTH_TEST));

 

 #if ENABLE_WORLD_COORDINATE

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

     glsafe(::glPushMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

     calc_selection_box_and_center();

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    const Transform3d base_matrix = local_transform(m_parent.get_selection());

+    for (int i = 0; i < 3; ++i) {

+        m_grabbers[i].matrix = base_matrix;

+    }

+#else

     transform_to_local(m_parent.get_selection());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

 

     const Vec3d zero = Vec3d::Zero();

     const Vec3d half_box_size = 0.5 * m_bounding_box.size();

@@ -236,7 +249,7 @@ void GLGizmoMove3D::on_render()
 

 #if ENABLE_GL_SHADERS_ATTRIBUTES

             const Camera& camera = wxGetApp().plater()->get_camera();

-            shader->set_uniform("view_model_matrix", camera.get_view_matrix());

+            shader->set_uniform("view_model_matrix", camera.get_view_matrix() * base_matrix);

             shader->set_uniform("projection_matrix", camera.get_projection_matrix());

 #endif // ENABLE_GL_SHADERS_ATTRIBUTES

 

@@ -270,8 +283,12 @@ void GLGizmoMove3D::on_render()
 #if !ENABLE_GIZMO_GRABBER_REFACTOR

         for (unsigned int i = 0; i < 3; ++i) {

             if (m_grabbers[i].enabled)

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+                render_grabber_extension((Axis)i, base_matrix, m_bounding_box, false);

+#else

                 render_grabber_extension((Axis)i, m_bounding_box, false);

-    }

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        }

 #endif // !ENABLE_GIZMO_GRABBER_REFACTOR

 #else

         render_grabbers(box);

@@ -292,7 +309,7 @@ void GLGizmoMove3D::on_render()
 

 #if ENABLE_GL_SHADERS_ATTRIBUTES

             const Camera& camera = wxGetApp().plater()->get_camera();

-            shader->set_uniform("view_model_matrix", camera.get_view_matrix());

+            shader->set_uniform("view_model_matrix", camera.get_view_matrix()* base_matrix);

             shader->set_uniform("projection_matrix", camera.get_projection_matrix());

 #endif // ENABLE_GL_SHADERS_ATTRIBUTES

 

@@ -329,7 +346,11 @@ void GLGizmoMove3D::on_render()
         }

 #if !ENABLE_GIZMO_GRABBER_REFACTOR

 #if ENABLE_WORLD_COORDINATE

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        render_grabber_extension((Axis)m_hover_id, base_matrix, m_bounding_box, false);

+#else

         render_grabber_extension((Axis)m_hover_id, m_bounding_box, false);

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

 #else

         render_grabber_extension((Axis)m_hover_id, box, false);

 #endif // ENABLE_WORLD_COORDINATE			

@@ -337,7 +358,9 @@ void GLGizmoMove3D::on_render()
     }

 

 #if ENABLE_WORLD_COORDINATE

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

     glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

 #endif // ENABLE_WORLD_COORDINATE

 }

 

@@ -346,15 +369,30 @@ void GLGizmoMove3D::on_render_for_picking()
     glsafe(::glDisable(GL_DEPTH_TEST));

 

 #if ENABLE_WORLD_COORDINATE

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    const Transform3d base_matrix = local_transform(m_parent.get_selection());

+    for (int i = 0; i < 3; ++i) {

+        m_grabbers[i].matrix = base_matrix;

+    }

+#else

     glsafe(::glPushMatrix());

     transform_to_local(m_parent.get_selection());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     render_grabbers_for_picking(m_bounding_box);

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+#if !ENABLE_GIZMO_GRABBER_REFACTOR

+    render_grabber_extension(X, base_matrix, m_bounding_box, true);

+    render_grabber_extension(Y, base_matrix, m_bounding_box, true);

+    render_grabber_extension(Z, base_matrix, m_bounding_box, true);

+#endif // !ENABLE_GIZMO_GRABBER_REFACTOR

+#else

 #if !ENABLE_GIZMO_GRABBER_REFACTOR

     render_grabber_extension(X, m_bounding_box, true);

     render_grabber_extension(Y, m_bounding_box, true);

     render_grabber_extension(Z, m_bounding_box, true);

 #endif // !ENABLE_GIZMO_GRABBER_REFACTOR

     glsafe(::glPopMatrix());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

 #else

     const BoundingBoxf3& box = m_parent.get_selection().get_bounding_box();

     render_grabbers_for_picking(box);

@@ -393,9 +431,14 @@ double GLGizmoMove3D::calc_projection(const UpdateData& data) const
 }

 

 #if !ENABLE_GIZMO_GRABBER_REFACTOR

+#if ENABLE_WORLD_COORDINATE && ENABLE_GL_SHADERS_ATTRIBUTES

+void GLGizmoMove3D::render_grabber_extension(Axis axis, const Transform3d& base_matrix, const BoundingBoxf3& box, bool picking)

+#else

 void GLGizmoMove3D::render_grabber_extension(Axis axis, const BoundingBoxf3& box, bool picking)

+#endif // ENABLE_WORLD_COORDINATE && ENABLE_GL_SHADERS_ATTRIBUTES

 {

-    const float mean_size = float((box.size().x() + box.size().y() + box.size().z()) / 3.0);

+    const Vec3d box_size = box.size();

+    const float mean_size = float((box_size.x() + box_size.y() + box_size.z()) / 3.0);

     const double size = m_dragging ? double(m_grabbers[axis].get_dragging_half_size(mean_size)) : double(m_grabbers[axis].get_half_size(mean_size));

 

 #if ENABLE_LEGACY_OPENGL_REMOVAL

@@ -420,7 +463,7 @@ void GLGizmoMove3D::render_grabber_extension(Axis axis, const BoundingBoxf3& box
 

 #if ENABLE_GL_SHADERS_ATTRIBUTES

     const Camera& camera = wxGetApp().plater()->get_camera();

-    Transform3d view_model_matrix = camera.get_view_matrix() * Geometry::assemble_transform(m_grabbers[axis].center);

+    Transform3d view_model_matrix = camera.get_view_matrix() * base_matrix * Geometry::assemble_transform(m_grabbers[axis].center);

     if (axis == X)

         view_model_matrix = view_model_matrix * Geometry::assemble_transform(Vec3d::Zero(), 0.5 * PI * Vec3d::UnitY());

     else if (axis == Y)

@@ -454,6 +497,28 @@ void GLGizmoMove3D::render_grabber_extension(Axis axis, const BoundingBoxf3& box
 #endif // !ENABLE_GIZMO_GRABBER_REFACTOR

 

 #if ENABLE_WORLD_COORDINATE

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+Transform3d GLGizmoMove3D::local_transform(const Selection& selection) const

+{

+    Transform3d ret = Geometry::assemble_transform(m_center);

+    if (!wxGetApp().obj_manipul()->is_world_coordinates()) {

+        const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        Transform3d orient_matrix = v.get_instance_transformation().get_rotation_matrix();

+#else

+        Transform3d orient_matrix = v.get_instance_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+        if (selection.is_single_volume_or_modifier() && wxGetApp().obj_manipul()->is_local_coordinates())

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+            orient_matrix = orient_matrix * v.get_volume_transformation().get_rotation_matrix();

+#else

+            orient_matrix = orient_matrix * v.get_volume_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+        ret = ret * orient_matrix;

+    }

+    return ret;

+}

+#else

 void GLGizmoMove3D::transform_to_local(const Selection& selection) const

 {

     glsafe(::glTranslated(m_center.x(), m_center.y(), m_center.z()));

@@ -466,6 +531,7 @@ void GLGizmoMove3D::transform_to_local(const Selection& selection) const
         glsafe(::glMultMatrixd(orient_matrix.data()));

     }

 }

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

 

 void GLGizmoMove3D::calc_selection_box_and_center()

 {

@@ -477,7 +543,12 @@ void GLGizmoMove3D::calc_selection_box_and_center()
     }

     else if (coordinates_type == ECoordinatesType::Local && selection.is_single_volume_or_modifier()) {

         const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        m_bounding_box = v.transformed_convex_hull_bounding_box(

+            v.get_instance_transformation().get_scaling_factor_matrix() * v.get_volume_transformation().get_scaling_factor_matrix());

+#else

         m_bounding_box = v.transformed_convex_hull_bounding_box(v.get_instance_transformation().get_matrix(true, true, false, true) * v.get_volume_transformation().get_matrix(true, true, false, true));

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

         m_center = v.world_matrix() * m_bounding_box.center();

     }

     else {

@@ -487,8 +558,13 @@ void GLGizmoMove3D::calc_selection_box_and_center()
             const GLVolume& v = *selection.get_volume(id);

             m_bounding_box.merge(v.transformed_convex_hull_bounding_box(v.get_volume_transformation().get_matrix()));

         }

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        m_bounding_box = m_bounding_box.transformed(selection.get_volume(*ids.begin())->get_instance_transformation().get_scaling_factor_matrix());

+        m_center = selection.get_volume(*ids.begin())->get_instance_transformation().get_matrix_no_scaling_factor() * m_bounding_box.center();

+#else

         m_bounding_box = m_bounding_box.transformed(selection.get_volume(*ids.begin())->get_instance_transformation().get_matrix(true, true, false, true));

         m_center = selection.get_volume(*ids.begin())->get_instance_transformation().get_matrix(false, false, true, false) * m_bounding_box.center();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

     }

 }

 #endif // ENABLE_WORLD_COORDINATE

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMove.hpp b/src/slic3r/GUI/Gizmos/GLGizmoMove.hpp
index c1368cf62..85f3c4785 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMove.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMove.hpp
@@ -71,7 +71,11 @@ protected:
 private:

     double calc_projection(const UpdateData& data) const;

 #if ENABLE_WORLD_COORDINATE

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    Transform3d local_transform(const Selection& selection) const;

+#else

     void transform_to_local(const Selection& selection) const;

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     void calc_selection_box_and_center();

 #endif // ENABLE_WORLD_COORDINATE

 #if !ENABLE_GIZMO_GRABBER_REFACTOR

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
index 0cba59c6d..c7731f1ff 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
@@ -1,1383 +1,1407 @@
-// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.
-#include "GLGizmoPainterBase.hpp"
-#include "slic3r/GUI/GLCanvas3D.hpp"
-#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"
-
-#include <GL/glew.h>
-
-#include "slic3r/GUI/GUI_App.hpp"
-#include "slic3r/GUI/Camera.hpp"
-#include "slic3r/GUI/Plater.hpp"
-#include "slic3r/GUI/OpenGLManager.hpp"
-#include "slic3r/Utils/UndoRedo.hpp"
-#include "libslic3r/Model.hpp"
-#include "libslic3r/PresetBundle.hpp"
-#include "libslic3r/TriangleMesh.hpp"
-
-#include <memory>
-#include <optional>
-
-namespace Slic3r::GUI {
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-std::shared_ptr<GLModel> GLGizmoPainterBase::s_sphere = nullptr;
-#else
-std::shared_ptr<GLIndexedVertexArray> GLGizmoPainterBase::s_sphere = nullptr;
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-GLGizmoPainterBase::GLGizmoPainterBase(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
-    : GLGizmoBase(parent, icon_filename, sprite_id)
-{
-}
-
-GLGizmoPainterBase::~GLGizmoPainterBase()
-{
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    if (s_sphere != nullptr)
-        s_sphere.reset();
-#else
-    if (s_sphere != nullptr && s_sphere->has_VBOs())
-        s_sphere->release_geometry();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-}
-
-void GLGizmoPainterBase::data_changed()
-{
-    if (m_state != On)
-        return;
-
-    const ModelObject* mo = m_c->selection_info() ? m_c->selection_info()->model_object() : nullptr;
-    const Selection &  selection = m_parent.get_selection();
-    if (mo && selection.is_from_single_instance()
-     && (m_schedule_update || mo->id() != m_old_mo_id || mo->volumes.size() != m_old_volumes_size))
-    {
-        update_from_model_object();
-        m_old_mo_id = mo->id();
-        m_old_volumes_size = mo->volumes.size();
-        m_schedule_update = false;
-    }
-}
-
-GLGizmoPainterBase::ClippingPlaneDataWrapper GLGizmoPainterBase::get_clipping_plane_data() const
-{
-    ClippingPlaneDataWrapper clp_data_out{{0.f, 0.f, 1.f, FLT_MAX}, {-FLT_MAX, FLT_MAX}};
-    // Take care of the clipping plane. The normal of the clipping plane is
-    // saved with opposite sign than we need to pass to OpenGL (FIXME)
-    if (bool clipping_plane_active = m_c->object_clipper()->get_position() != 0.; clipping_plane_active) {
-        const ClippingPlane *clp = m_c->object_clipper()->get_clipping_plane();
-        for (size_t i = 0; i < 3; ++i)
-            clp_data_out.clp_dataf[i] = -1.f * float(clp->get_data()[i]);
-        clp_data_out.clp_dataf[3] = float(clp->get_data()[3]);
-    }
-
-    // z_range is calculated in the same way as in GLCanvas3D::_render_objects(GLVolumeCollection::ERenderType type)
-    if (m_c->get_canvas()->get_use_clipping_planes()) {
-        const std::array<ClippingPlane, 2> &clps = m_c->get_canvas()->get_clipping_planes();
-        clp_data_out.z_range                     = {float(-clps[0].get_data()[3]), float(clps[1].get_data()[3])};
-    }
-
-    return clp_data_out;
-}
-
-void GLGizmoPainterBase::render_triangles(const Selection& selection) const
-{
-    auto* shader = wxGetApp().get_shader("gouraud");
-    if (! shader)
-        return;
-    shader->start_using();
-    shader->set_uniform("slope.actived", false);
-    shader->set_uniform("print_volume.type", 0);
-    shader->set_uniform("clipping_plane", this->get_clipping_plane_data().clp_dataf);
-    ScopeGuard guard([shader]() { if (shader) shader->stop_using(); });
-
-    const ModelObject *mo      = m_c->selection_info()->model_object();
-    int                mesh_id = -1;
-    for (const ModelVolume* mv : mo->volumes) {
-        if (! mv->is_model_part())
-            continue;
-
-        ++mesh_id;
-
-        const Transform3d trafo_matrix =
-            mo->instances[selection.get_instance_idx()]->get_transformation().get_matrix() *
-            mv->get_matrix();
-
-        bool is_left_handed = trafo_matrix.matrix().determinant() < 0.;
-        if (is_left_handed)
-            glsafe(::glFrontFace(GL_CW));
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Camera& camera = wxGetApp().plater()->get_camera();
-        const Transform3d matrix = camera.get_view_matrix() * trafo_matrix;
-        shader->set_uniform("view_model_matrix", matrix);
-        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-        shader->set_uniform("normal_matrix", (Matrix3d)matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
-#else
-        glsafe(::glPushMatrix());
-        glsafe(::glMultMatrixd(trafo_matrix.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-        // For printers with multiple extruders, it is necessary to pass trafo_matrix
-        // to the shader input variable print_box.volume_world_matrix before
-        // rendering the painted triangles. When this matrix is not set, the
-        // wrong transformation matrix is used for "Clipping of view".
-        shader->set_uniform("volume_world_matrix", trafo_matrix);
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        m_triangle_selectors[mesh_id]->render(m_imgui, trafo_matrix);
-#else
-        m_triangle_selectors[mesh_id]->render(m_imgui);
-
-        glsafe(::glPopMatrix());
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        if (is_left_handed)
-            glsafe(::glFrontFace(GL_CCW));
-    }
-}
-
-void GLGizmoPainterBase::render_cursor()
-{
-    // First check that the mouse pointer is on an object.
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    const Selection& selection = m_parent.get_selection();
-    const ModelInstance* mi = mo->instances[selection.get_instance_idx()];
-    const Camera& camera = wxGetApp().plater()->get_camera();
-
-    // Precalculate transformations of individual meshes.
-    std::vector<Transform3d> trafo_matrices;
-    for (const ModelVolume* mv : mo->volumes) {
-        if (mv->is_model_part())
-            trafo_matrices.emplace_back(mi->get_transformation().get_matrix() * mv->get_matrix());
-    }
-    // Raycast and return if there's no hit.
-    update_raycast_cache(m_parent.get_local_mouse_position(), camera, trafo_matrices);
-    if (m_rr.mesh_id == -1)
-        return;
-
-    if (m_tool_type == ToolType::BRUSH) {
-        if (m_cursor_type == TriangleSelector::SPHERE)
-            render_cursor_sphere(trafo_matrices[m_rr.mesh_id]);
-        else if (m_cursor_type == TriangleSelector::CIRCLE)
-            render_cursor_circle();
-    }
-}
-
-void GLGizmoPainterBase::render_cursor_circle()
-{
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-    const Camera &camera   = wxGetApp().plater()->get_camera();
-    const float   zoom     = float(camera.get_zoom());
-    const float   inv_zoom = (zoom != 0.0f) ? 1.0f / zoom : 0.0f;
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-
-    const Size cnv_size = m_parent.get_canvas_size();
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    const float cnv_width  = float(cnv_size.get_width());
-    const float cnv_height = float(cnv_size.get_height());
-    if (cnv_width == 0.0f || cnv_height == 0.0f)
-        return;
-
-    const float cnv_inv_width  = 1.0f / cnv_width;
-    const float cnv_inv_height = 1.0f / cnv_height;
-
-    const Vec2d center = m_parent.get_local_mouse_position();
-    const float radius = m_cursor_radius * float(wxGetApp().plater()->get_camera().get_zoom());
-#else
-    const float cnv_half_width  = 0.5f * float(cnv_size.get_width());
-    const float cnv_half_height = 0.5f * float(cnv_size.get_height());
-    if (cnv_half_width == 0.0f || cnv_half_height == 0.0f)
-        return;
-    const Vec2d mouse_pos(m_parent.get_local_mouse_position().x(), m_parent.get_local_mouse_position().y());
-    Vec2d center(mouse_pos.x() - cnv_half_width, cnv_half_height - mouse_pos.y());
-    center = center * inv_zoom;
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-    glsafe(::glLineWidth(1.5f));
-#if !ENABLE_LEGACY_OPENGL_REMOVAL
-    static const std::array<float, 3> color = { 0.f, 1.f, 0.3f };
-    glsafe(::glColor3fv(color.data()));
-#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
-    glsafe(::glDisable(GL_DEPTH_TEST));
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-    glsafe(::glPushMatrix());
-    glsafe(::glLoadIdentity());
-    // ensure that the circle is renderered inside the frustrum
-    glsafe(::glTranslated(0.0, 0.0, -(camera.get_near_z() + 0.5)));
-    // ensure that the overlay fits the frustrum near z plane
-    const double gui_scale = camera.get_gui_scale();
-    glsafe(::glScaled(gui_scale, gui_scale, 1.0));
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-
-    glsafe(::glPushAttrib(GL_ENABLE_BIT));
-    glsafe(::glLineStipple(4, 0xAAAA));
-    glsafe(::glEnable(GL_LINE_STIPPLE));
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    if (!m_circle.is_initialized() || !m_old_center.isApprox(center) || std::abs(m_old_cursor_radius - radius) > EPSILON) {
-        m_old_cursor_radius = radius;
-#else
-    if (!m_circle.is_initialized() || !m_old_center.isApprox(center) || std::abs(m_old_cursor_radius - m_cursor_radius) > EPSILON) {
-        m_old_cursor_radius = m_cursor_radius;
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        m_old_center = center;
-        m_circle.reset();
-
-        GLModel::Geometry init_data;
-        static const unsigned int StepsCount = 32;
-        static const float StepSize = 2.0f * float(PI) / float(StepsCount);
-        init_data.format = { GLModel::Geometry::EPrimitiveType::LineLoop, GLModel::Geometry::EVertexLayout::P2 };
-        init_data.color  = { 0.0f, 1.0f, 0.3f, 1.0f };
-        init_data.reserve_vertices(StepsCount);
-        init_data.reserve_indices(StepsCount);
-
-        // vertices + indices
-        for (unsigned int i = 0; i < StepsCount; ++i) {
-            const float angle = float(i) * StepSize;
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-            init_data.add_vertex(Vec2f(2.0f * ((center.x() + ::cos(angle) * radius) * cnv_inv_width - 0.5f),
-                                       -2.0f * ((center.y() + ::sin(angle) * radius) * cnv_inv_height - 0.5f)));
-#else
-            init_data.add_vertex(Vec2f(center.x() + ::cos(angle) * m_cursor_radius, center.y() + ::sin(angle) * m_cursor_radius));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-            init_data.add_index(i);
-        }
-
-        m_circle.init_from(std::move(init_data));
-    }
-
-    GLShaderProgram* shader = GUI::wxGetApp().get_shader("flat");
-    if (shader != nullptr) {
-        shader->start_using();
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        shader->set_uniform("view_model_matrix", Transform3d::Identity());
-        shader->set_uniform("projection_matrix", Transform3d::Identity());
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        m_circle.render();
-        shader->stop_using();
-    }
-#else
-    ::glBegin(GL_LINE_LOOP);
-    for (double angle=0; angle<2*M_PI; angle+=M_PI/20.)
-        ::glVertex2f(GLfloat(center.x()+m_cursor_radius*cos(angle)), GLfloat(center.y()+m_cursor_radius*sin(angle)));
-    glsafe(::glEnd());
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    glsafe(::glPopAttrib());
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-    glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-    glsafe(::glEnable(GL_DEPTH_TEST));
-}
-
-
-void GLGizmoPainterBase::render_cursor_sphere(const Transform3d& trafo) const
-{
-    if (s_sphere == nullptr) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        s_sphere = std::make_shared<GLModel>();
-        s_sphere->init_from(its_make_sphere(1.0, double(PI) / 12.0));
-#else
-        s_sphere = std::make_shared<GLIndexedVertexArray>();
-        s_sphere->load_its_flat_shading(its_make_sphere(1.0, double(PI) / 12.0));
-        s_sphere->finalize_geometry(true);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLShaderProgram* shader = wxGetApp().get_shader("flat");
-    if (shader == nullptr)
-        return;
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    const Transform3d complete_scaling_matrix_inverse = Geometry::Transformation(trafo).get_matrix(true, true, false, true).inverse();
-    const bool is_left_handed = Geometry::Transformation(trafo).is_left_handed();
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-    glsafe(::glPushMatrix());
-    glsafe(::glMultMatrixd(trafo.data()));
-    // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.
-    glsafe(::glTranslatef(m_rr.hit.x(), m_rr.hit.y(), m_rr.hit.z()));
-    glsafe(::glMultMatrixd(complete_scaling_matrix_inverse.data()));
-    glsafe(::glScaled(m_cursor_radius, m_cursor_radius, m_cursor_radius));
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-
-    if (is_left_handed)
-        glFrontFace(GL_CW);
-
-    ColorRGBA render_color = { 0.0f, 0.0f, 0.0f, 0.25f };
-    if (m_button_down == Button::Left)
-        render_color = this->get_cursor_sphere_left_button_color();
-    else if (m_button_down == Button::Right)
-        render_color = this->get_cursor_sphere_right_button_color();
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    shader->start_using();
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    const Camera& camera = wxGetApp().plater()->get_camera();
-    Transform3d view_model_matrix = camera.get_view_matrix() * trafo *
-        Geometry::assemble_transform(m_rr.hit.cast<double>()) * complete_scaling_matrix_inverse *
-        Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), m_cursor_radius * Vec3d::Ones());
-
-    shader->set_uniform("view_model_matrix", view_model_matrix);
-    shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-    assert(s_sphere != nullptr);
-    s_sphere->set_color(render_color);
-#else
-    glsafe(::glColor4fv(render_color.data()));
-
-    assert(s_sphere != nullptr);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    s_sphere->render();
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    shader->stop_using();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    if (is_left_handed)
-        glFrontFace(GL_CCW);
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-    glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-}
-
-
-bool GLGizmoPainterBase::is_mesh_point_clipped(const Vec3d& point, const Transform3d& trafo) const
-{
-    if (m_c->object_clipper()->get_position() == 0.)
-        return false;
-
-    auto sel_info = m_c->selection_info();
-    Vec3d transformed_point =  trafo * point;
-    transformed_point(2) += sel_info->get_sla_shift();
-    return m_c->object_clipper()->get_clipping_plane()->is_point_clipped(transformed_point);
-}
-
-// Interpolate points between the previous and current mouse positions, which are then projected onto the object.
-// Returned projected mouse positions are grouped by mesh_idx. It may contain multiple std::vector<GLGizmoPainterBase::ProjectedMousePosition>
-// with the same mesh_idx, but all items in std::vector<GLGizmoPainterBase::ProjectedMousePosition> always have the same mesh_idx.
-std::vector<std::vector<GLGizmoPainterBase::ProjectedMousePosition>> GLGizmoPainterBase::get_projected_mouse_positions(const Vec2d &mouse_position, const double resolution, const std::vector<Transform3d> &trafo_matrices) const
-{
-    // List of mouse positions that will be used as seeds for painting.
-    std::vector<Vec2d> mouse_positions{mouse_position};
-    if (m_last_mouse_click != Vec2d::Zero()) {
-        // In case current mouse position is far from the last one,
-        // add several positions from between into the list, so there
-        // are no gaps in the painted region.
-        if (size_t patches_in_between = size_t((mouse_position - m_last_mouse_click).norm() / resolution); patches_in_between > 0) {
-            const Vec2d diff = (m_last_mouse_click - mouse_position) / (patches_in_between + 1);
-            for (size_t patch_idx = 1; patch_idx <= patches_in_between; ++patch_idx)
-                mouse_positions.emplace_back(mouse_position + patch_idx * diff);
-            mouse_positions.emplace_back(m_last_mouse_click);
-        }
-    }
-
-    const Camera                       &camera = wxGetApp().plater()->get_camera();
-    std::vector<ProjectedMousePosition> mesh_hit_points;
-    mesh_hit_points.reserve(mouse_positions.size());
-
-    // In mesh_hit_points only the last item could have mesh_id == -1, any other items mustn't.
-    for (const Vec2d &mp : mouse_positions) {
-        update_raycast_cache(mp, camera, trafo_matrices);
-        mesh_hit_points.push_back({m_rr.hit, m_rr.mesh_id, m_rr.facet});
-        if (m_rr.mesh_id == -1)
-            break;
-    }
-
-    // Divide mesh_hit_points into groups with the same mesh_idx. It may contain multiple groups with the same mesh_idx.
-    std::vector<std::vector<ProjectedMousePosition>> mesh_hit_points_by_mesh;
-    for (size_t prev_mesh_hit_point = 0, curr_mesh_hit_point = 0; curr_mesh_hit_point < mesh_hit_points.size(); ++curr_mesh_hit_point) {
-        size_t next_mesh_hit_point = curr_mesh_hit_point + 1;
-        if (next_mesh_hit_point >= mesh_hit_points.size() || mesh_hit_points[curr_mesh_hit_point].mesh_idx != mesh_hit_points[next_mesh_hit_point].mesh_idx) {
-            mesh_hit_points_by_mesh.emplace_back();
-            mesh_hit_points_by_mesh.back().insert(mesh_hit_points_by_mesh.back().end(), mesh_hit_points.begin() + int(prev_mesh_hit_point), mesh_hit_points.begin() + int(next_mesh_hit_point));
-            prev_mesh_hit_point = next_mesh_hit_point;
-        }
-    }
-
-    auto on_same_facet = [](std::vector<ProjectedMousePosition> &hit_points) -> bool {
-        for (const ProjectedMousePosition &mesh_hit_point : hit_points)
-            if (mesh_hit_point.facet_idx != hit_points.front().facet_idx)
-                return false;
-        return true;
-    };
-
-    struct Plane
-    {
-        Vec3d origin;
-        Vec3d first_axis;
-        Vec3d second_axis;
-    };
-    auto find_plane = [](std::vector<ProjectedMousePosition> &hit_points) -> std::optional<Plane> {
-        assert(hit_points.size() >= 3);
-        for (size_t third_idx = 2; third_idx < hit_points.size(); ++third_idx) {
-            const Vec3d &first_point  = hit_points[third_idx - 2].mesh_hit.cast<double>();
-            const Vec3d &second_point = hit_points[third_idx - 1].mesh_hit.cast<double>();
-            const Vec3d &third_point  = hit_points[third_idx].mesh_hit.cast<double>();
-
-            const Vec3d  first_vec    = first_point - second_point;
-            const Vec3d  second_vec   = third_point - second_point;
-
-            // If three points aren't collinear, then there exists only one plane going through all points.
-            if (first_vec.cross(second_vec).squaredNorm() > sqr(EPSILON)) {
-                const Vec3d first_axis_vec_n = first_vec.normalized();
-                // Make second_vec perpendicular to first_axis_vec_n using Gram–Schmidt orthogonalization process
-                const Vec3d second_axis_vec_n = (second_vec - (first_vec.dot(second_vec) / first_vec.dot(first_vec)) * first_vec).normalized();
-                return Plane{second_point, first_axis_vec_n, second_axis_vec_n};
-            }
-        }
-
-        return std::nullopt;
-    };
-
-    for(std::vector<ProjectedMousePosition> &hit_points : mesh_hit_points_by_mesh) {
-        assert(!hit_points.empty());
-        if (hit_points.back().mesh_idx == -1)
-            break;
-
-        if (hit_points.size() <= 2)
-            continue;
-
-        if (on_same_facet(hit_points)) {
-            hit_points = {hit_points.front(), hit_points.back()};
-        } else if (std::optional<Plane> plane = find_plane(hit_points); plane) {
-            Polyline polyline;
-            polyline.points.reserve(hit_points.size());
-            // Project hit_points into its plane to simplified them in the next step.
-            for (auto &hit_point : hit_points) {
-                const Vec3d &point  = hit_point.mesh_hit.cast<double>();
-                const double x_cord = plane->first_axis.dot(point - plane->origin);
-                const double y_cord = plane->second_axis.dot(point - plane->origin);
-                polyline.points.emplace_back(scale_(x_cord), scale_(y_cord));
-            }
-
-            polyline.simplify(scale_(m_cursor_radius) / 10.);
-
-            const int                           mesh_idx = hit_points.front().mesh_idx;
-            std::vector<ProjectedMousePosition> new_hit_points;
-            new_hit_points.reserve(polyline.points.size());
-            // Project 2D simplified hit_points beck to 3D.
-            for (const Point &point : polyline.points) {
-                const double x_cord        = unscale<double>(point.x());
-                const double y_cord        = unscale<double>(point.y());
-                const Vec3d  new_hit_point = plane->origin + x_cord * plane->first_axis + y_cord * plane->second_axis;
-                const int    facet_idx     = m_c->raycaster()->raycasters()[mesh_idx]->get_closest_facet(new_hit_point.cast<float>());
-                new_hit_points.push_back({new_hit_point.cast<float>(), mesh_idx, size_t(facet_idx)});
-            }
-
-            hit_points = new_hit_points;
-        } else {
-            hit_points = {hit_points.front(), hit_points.back()};
-        }
-    }
-
-    return mesh_hit_points_by_mesh;
-}
-
-// Following function is called from GLCanvas3D to inform the gizmo about a mouse/keyboard event.
-// The gizmo has an opportunity to react - if it does, it should return true so that the Canvas3D is
-// aware that the event was reacted to and stops trying to make different sense of it. If the gizmo
-// concludes that the event was not intended for it, it should return false.
-bool GLGizmoPainterBase::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)
-{
-    if (action == SLAGizmoEventType::MouseWheelUp
-     || action == SLAGizmoEventType::MouseWheelDown) {
-        if (control_down) {
-            double pos = m_c->object_clipper()->get_position();
-            pos = action == SLAGizmoEventType::MouseWheelDown
-                      ? std::max(0., pos - 0.01)
-                      : std::min(1., pos + 0.01);
-            m_c->object_clipper()->set_position(pos, true);
-            return true;
-        }
-        else if (alt_down) {
-            if (m_tool_type == ToolType::BRUSH && (m_cursor_type == TriangleSelector::CursorType::SPHERE || m_cursor_type == TriangleSelector::CursorType::CIRCLE)) {
-                m_cursor_radius = action == SLAGizmoEventType::MouseWheelDown ? std::max(m_cursor_radius - this->get_cursor_radius_step(), this->get_cursor_radius_min())
-                                                                              : std::min(m_cursor_radius + this->get_cursor_radius_step(), this->get_cursor_radius_max());
-                m_parent.set_as_dirty();
-                return true;
-            } else if (m_tool_type == ToolType::SMART_FILL) {
-                m_smart_fill_angle = action == SLAGizmoEventType::MouseWheelDown ? std::max(m_smart_fill_angle - SmartFillAngleStep, SmartFillAngleMin)
-                                                                                : std::min(m_smart_fill_angle + SmartFillAngleStep, SmartFillAngleMax);
-                m_parent.set_as_dirty();
-                if (m_rr.mesh_id != -1) {
-                    const Selection     &selection                 = m_parent.get_selection();
-                    const ModelObject   *mo                        = m_c->selection_info()->model_object();
-                    const ModelInstance *mi                        = mo->instances[selection.get_instance_idx()];
-                    const Transform3d   trafo_matrix_not_translate = mi->get_transformation().get_matrix(true) * mo->volumes[m_rr.mesh_id]->get_matrix(true);
-                    const Transform3d   trafo_matrix = mi->get_transformation().get_matrix() * mo->volumes[m_rr.mesh_id]->get_matrix();
-                    m_triangle_selectors[m_rr.mesh_id]->seed_fill_select_triangles(m_rr.hit, int(m_rr.facet), trafo_matrix_not_translate, this->get_clipping_plane_in_volume_coordinates(trafo_matrix), m_smart_fill_angle,
-                                                                                   m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f, true);
-                    m_triangle_selectors[m_rr.mesh_id]->request_update_render_data();
-                    m_seed_fill_last_mesh_id = m_rr.mesh_id;
-                }
-                return true;
-            }
-
-            return false;
-        }
-    }
-
-    if (action == SLAGizmoEventType::ResetClippingPlane) {
-        m_c->object_clipper()->set_position(-1., false);
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::LeftDown
-     || action == SLAGizmoEventType::RightDown
-    || (action == SLAGizmoEventType::Dragging && m_button_down != Button::None)) {
-
-        if (m_triangle_selectors.empty())
-            return false;
-
-        EnforcerBlockerType new_state = EnforcerBlockerType::NONE;
-        if (! shift_down) {
-            if (action == SLAGizmoEventType::Dragging)
-                new_state = m_button_down == Button::Left ? this->get_left_button_state_type() : this->get_right_button_state_type();
-            else
-                new_state = action == SLAGizmoEventType::LeftDown ? this->get_left_button_state_type() : this->get_right_button_state_type();
-        }
-
-        const Camera        &camera                      = wxGetApp().plater()->get_camera();
-        const Selection     &selection                   = m_parent.get_selection();
-        const ModelObject   *mo                          = m_c->selection_info()->model_object();
-        const ModelInstance *mi                          = mo->instances[selection.get_instance_idx()];
-        const Transform3d   instance_trafo               = mi->get_transformation().get_matrix();
-        const Transform3d   instance_trafo_not_translate = mi->get_transformation().get_matrix(true);
-
-        // Precalculate transformations of individual meshes.
-        std::vector<Transform3d> trafo_matrices;
-        std::vector<Transform3d> trafo_matrices_not_translate;
-        for (const ModelVolume *mv : mo->volumes)
-            if (mv->is_model_part()) {
-                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());
-                trafo_matrices_not_translate.emplace_back(instance_trafo_not_translate * mv->get_matrix(true));
-            }
-
-        std::vector<std::vector<ProjectedMousePosition>> projected_mouse_positions_by_mesh = get_projected_mouse_positions(mouse_position, 1., trafo_matrices);
-        m_last_mouse_click = Vec2d::Zero(); // only actual hits should be saved
-
-        for (const std::vector<ProjectedMousePosition> &projected_mouse_positions : projected_mouse_positions_by_mesh) {
-            assert(!projected_mouse_positions.empty());
-            const int  mesh_idx                = projected_mouse_positions.front().mesh_idx;
-            const bool dragging_while_painting = (action == SLAGizmoEventType::Dragging && m_button_down != Button::None);
-
-            // The mouse button click detection is enabled when there is a valid hit.
-            // Missing the object entirely
-            // shall not capture the mouse.
-            if (mesh_idx != -1)
-                if (m_button_down == Button::None)
-                    m_button_down = ((action == SLAGizmoEventType::LeftDown) ? Button::Left : Button::Right);
-
-            // In case we have no valid hit, we can return. The event will be stopped when
-            // dragging while painting (to prevent scene rotations and moving the object)
-            if (mesh_idx == -1)
-                return dragging_while_painting;
-
-            const Transform3d &trafo_matrix               = trafo_matrices[mesh_idx];
-            const Transform3d &trafo_matrix_not_translate = trafo_matrices_not_translate[mesh_idx];
-
-            // Calculate direction from camera to the hit (in mesh coords):
-            Vec3f camera_pos = (trafo_matrix.inverse() * camera.get_position()).cast<float>();
-
-            assert(mesh_idx < int(m_triangle_selectors.size()));
-            const TriangleSelector::ClippingPlane &clp = this->get_clipping_plane_in_volume_coordinates(trafo_matrix);
-            if (m_tool_type == ToolType::SMART_FILL || m_tool_type == ToolType::BUCKET_FILL || (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER)) {
-                for(const ProjectedMousePosition &projected_mouse_position : projected_mouse_positions) {
-                    assert(projected_mouse_position.mesh_idx == mesh_idx);
-                    const Vec3f mesh_hit = projected_mouse_position.mesh_hit;
-                    const int facet_idx = int(projected_mouse_position.facet_idx);
-                    m_triangle_selectors[mesh_idx]->seed_fill_apply_on_triangles(new_state);
-                    if (m_tool_type == ToolType::SMART_FILL)
-                        m_triangle_selectors[mesh_idx]->seed_fill_select_triangles(mesh_hit, facet_idx, trafo_matrix_not_translate, clp, m_smart_fill_angle,
-                                                                                       m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f, true);
-                    else if (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER)
-                        m_triangle_selectors[mesh_idx]->bucket_fill_select_triangles(mesh_hit, facet_idx, clp, false, true);
-                    else if (m_tool_type == ToolType::BUCKET_FILL)
-                        m_triangle_selectors[mesh_idx]->bucket_fill_select_triangles(mesh_hit, facet_idx, clp, true, true);
-
-                    m_seed_fill_last_mesh_id = -1;
-                }
-            } else if (m_tool_type == ToolType::BRUSH) {
-                assert(m_cursor_type == TriangleSelector::CursorType::CIRCLE || m_cursor_type == TriangleSelector::CursorType::SPHERE);
-
-                if (projected_mouse_positions.size() == 1) {
-                    const ProjectedMousePosition             &first_position = projected_mouse_positions.front();
-                    std::unique_ptr<TriangleSelector::Cursor> cursor         = TriangleSelector::SinglePointCursor::cursor_factory(first_position.mesh_hit,
-                                                                                                                                   camera_pos, m_cursor_radius,
-                                                                                                                                   m_cursor_type, trafo_matrix, clp);
-                    m_triangle_selectors[mesh_idx]->select_patch(int(first_position.facet_idx), std::move(cursor), new_state, trafo_matrix_not_translate,
-                                                                 m_triangle_splitting_enabled, m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f);
-                } else {
-                    for (auto first_position_it = projected_mouse_positions.cbegin(); first_position_it != projected_mouse_positions.cend() - 1; ++first_position_it) {
-                        auto second_position_it = first_position_it + 1;
-                        std::unique_ptr<TriangleSelector::Cursor> cursor = TriangleSelector::DoublePointCursor::cursor_factory(first_position_it->mesh_hit, second_position_it->mesh_hit, camera_pos, m_cursor_radius, m_cursor_type, trafo_matrix, clp);
-                        m_triangle_selectors[mesh_idx]->select_patch(int(first_position_it->facet_idx), std::move(cursor), new_state, trafo_matrix_not_translate, m_triangle_splitting_enabled, m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f);
-                    }
-                }
-            }
-
-            m_triangle_selectors[mesh_idx]->request_update_render_data();
-            m_last_mouse_click = mouse_position;
-        }
-
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::Moving && (m_tool_type == ToolType::SMART_FILL || m_tool_type == ToolType::BUCKET_FILL || (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER))) {
-        if (m_triangle_selectors.empty())
-            return false;
-
-        const Camera        &camera                       = wxGetApp().plater()->get_camera();
-        const Selection     &selection                    = m_parent.get_selection();
-        const ModelObject   *mo                           = m_c->selection_info()->model_object();
-        const ModelInstance *mi                           = mo->instances[selection.get_instance_idx()];
-        const Transform3d    instance_trafo               = mi->get_transformation().get_matrix();
-        const Transform3d    instance_trafo_not_translate = mi->get_transformation().get_matrix(true);
-
-        // Precalculate transformations of individual meshes.
-        std::vector<Transform3d> trafo_matrices;
-        std::vector<Transform3d> trafo_matrices_not_translate;
-        for (const ModelVolume *mv : mo->volumes)
-            if (mv->is_model_part()) {
-                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());
-                trafo_matrices_not_translate.emplace_back(instance_trafo_not_translate * mv->get_matrix(true));
-            }
-
-        // Now "click" into all the prepared points and spill paint around them.
-        update_raycast_cache(mouse_position, camera, trafo_matrices);
-
-        auto seed_fill_unselect_all = [this]() {
-            for (auto &triangle_selector : m_triangle_selectors) {
-                triangle_selector->seed_fill_unselect_all_triangles();
-                triangle_selector->request_update_render_data();
-            }
-        };
-
-        if (m_rr.mesh_id == -1) {
-            // Clean selected by seed fill for all triangles in all meshes when a mouse isn't pointing on any mesh.
-            seed_fill_unselect_all();
-            m_seed_fill_last_mesh_id = -1;
-
-            // In case we have no valid hit, we can return.
-            return false;
-        }
-
-        // The mouse moved from one object's volume to another one. So it is needed to unselect all triangles selected by seed fill.
-        if(m_rr.mesh_id != m_seed_fill_last_mesh_id)
-            seed_fill_unselect_all();
-
-        const Transform3d &trafo_matrix = trafo_matrices[m_rr.mesh_id];
-        const Transform3d &trafo_matrix_not_translate = trafo_matrices_not_translate[m_rr.mesh_id];
-
-        assert(m_rr.mesh_id < int(m_triangle_selectors.size()));
-        const TriangleSelector::ClippingPlane &clp = this->get_clipping_plane_in_volume_coordinates(trafo_matrix);
-        if (m_tool_type == ToolType::SMART_FILL)
-            m_triangle_selectors[m_rr.mesh_id]->seed_fill_select_triangles(m_rr.hit, int(m_rr.facet), trafo_matrix_not_translate, clp, m_smart_fill_angle,
-                                                                           m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f);
-        else if (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER)
-            m_triangle_selectors[m_rr.mesh_id]->bucket_fill_select_triangles(m_rr.hit, int(m_rr.facet), clp, false);
-        else if (m_tool_type == ToolType::BUCKET_FILL)
-            m_triangle_selectors[m_rr.mesh_id]->bucket_fill_select_triangles(m_rr.hit, int(m_rr.facet), clp, true);
-        m_triangle_selectors[m_rr.mesh_id]->request_update_render_data();
-        m_seed_fill_last_mesh_id = m_rr.mesh_id;
-        return true;
-    }
-
-    if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::RightUp)
-      && m_button_down != Button::None) {
-        // Take snapshot and update ModelVolume data.
-        wxString action_name = this->handle_snapshot_action_name(shift_down, m_button_down);
-        Plater::TakeSnapshot snapshot(wxGetApp().plater(), action_name, UndoRedo::SnapshotType::GizmoAction);
-        update_model_object();
-
-        m_button_down = Button::None;
-        m_last_mouse_click = Vec2d::Zero();
-        return true;
-    }
-
-    return false;
-}
-
-bool GLGizmoPainterBase::on_mouse(const wxMouseEvent &mouse_event)
-{
-    // wxCoord == int --> wx/types.h
-    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());
-    Vec2d mouse_pos = mouse_coord.cast<double>();
-
-    if (mouse_event.Moving()) {
-        gizmo_event(SLAGizmoEventType::Moving, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false);
-        return false;
-    }
-
-    // when control is down we allow scene pan and rotation even when clicking
-    // over some object
-    bool control_down           = mouse_event.CmdDown();
-    bool grabber_contains_mouse = (get_hover_id() != -1);
-
-    const Selection &selection = m_parent.get_selection();
-    int selected_object_idx = selection.get_object_idx();
-    if (mouse_event.LeftDown()) {
-        if ((!control_down || grabber_contains_mouse) &&            
-            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))
-            // the gizmo got the event and took some action, there is no need
-            // to do anything more
-            return true;
-    } else if (mouse_event.RightDown()){
-        if (!control_down && selected_object_idx != -1 &&
-            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) 
-            // event was taken care of
-            return true;
-    } else if (mouse_event.Dragging()) {
-        if (m_parent.get_move_volume_id() != -1)
-            // don't allow dragging objects with the Sla gizmo on
-            return true;
-        if (!control_down && gizmo_event(SLAGizmoEventType::Dragging,
-                                         mouse_pos, mouse_event.ShiftDown(),
-                                         mouse_event.AltDown(), false)) {
-            // the gizmo got the event and took some action, no need to do
-            // anything more here
-            m_parent.set_as_dirty();
-            return true;
-        }
-        if(control_down && (mouse_event.LeftIsDown() || mouse_event.RightIsDown()))
-        {
-            // CTRL has been pressed while already dragging -> stop current action
-            if (mouse_event.LeftIsDown())
-                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);
-            else if (mouse_event.RightIsDown())
-                gizmo_event(SLAGizmoEventType::RightUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);
-            return false;
-        }
-    } else if (mouse_event.LeftUp()) {
-        if (!m_parent.is_mouse_dragging()) {
-            // in case SLA/FDM gizmo is selected, we just pass the LeftUp
-            // event and stop processing - neither object moving or selecting
-            // is suppressed in that case
-            gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), control_down);
-            return true;
-        }
-    } else if (mouse_event.RightUp()) {
-        if (!m_parent.is_mouse_dragging()) {
-            gizmo_event(SLAGizmoEventType::RightUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), control_down);
-            return true;
-        }
-    }
-    return false;
-}
-
-void GLGizmoPainterBase::update_raycast_cache(const Vec2d& mouse_position,
-                                              const Camera& camera,
-                                              const std::vector<Transform3d>& trafo_matrices) const
-{
-    if (m_rr.mouse_position == mouse_position) {
-        // Same query as last time - the answer is already in the cache.
-        return;
-    }
-
-    Vec3f normal =  Vec3f::Zero();
-    Vec3f hit = Vec3f::Zero();
-    size_t facet = 0;
-    Vec3f closest_hit = Vec3f::Zero();
-    double closest_hit_squared_distance = std::numeric_limits<double>::max();
-    size_t closest_facet = 0;
-    int closest_hit_mesh_id = -1;
-
-    // Cast a ray on all meshes, pick the closest hit and save it for the respective mesh
-    for (int mesh_id = 0; mesh_id < int(trafo_matrices.size()); ++mesh_id) {
-
-        if (m_c->raycaster()->raycasters()[mesh_id]->unproject_on_mesh(
-                   mouse_position,
-                   trafo_matrices[mesh_id],
-                   camera,
-                   hit,
-                   normal,
-                   m_c->object_clipper()->get_clipping_plane(),
-                   &facet))
-        {
-            // In case this hit is clipped, skip it.
-            if (is_mesh_point_clipped(hit.cast<double>(), trafo_matrices[mesh_id]))
-                continue;
-
-            // Is this hit the closest to the camera so far?
-            double hit_squared_distance = (camera.get_position()-trafo_matrices[mesh_id]*hit.cast<double>()).squaredNorm();
-            if (hit_squared_distance < closest_hit_squared_distance) {
-                closest_hit_squared_distance = hit_squared_distance;
-                closest_facet = facet;
-                closest_hit_mesh_id = mesh_id;
-                closest_hit = hit;
-            }
-        }
-    }
-
-    m_rr = {mouse_position, closest_hit_mesh_id, closest_hit, closest_facet};
-}
-
-bool GLGizmoPainterBase::on_is_activable() const
-{
-    const Selection& selection = m_parent.get_selection();
-
-    if (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() != ptFFF
-        || !selection.is_single_full_instance() || wxGetApp().get_mode() == comSimple)
-        return false;
-
-    // Check that none of the selected volumes is outside. Only SLA auxiliaries (supports) are allowed outside.
-    const Selection::IndicesList& list = selection.get_volume_idxs();
-    return std::all_of(list.cbegin(), list.cend(), [&selection](unsigned int idx) { return !selection.get_volume(idx)->is_outside; });
-}
-
-bool GLGizmoPainterBase::on_is_selectable() const
-{
-    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptFFF
-         && wxGetApp().get_mode() != comSimple );
-}
-
-
-CommonGizmosDataID GLGizmoPainterBase::on_get_requirements() const
-{
-    return CommonGizmosDataID(
-                int(CommonGizmosDataID::SelectionInfo)
-              | int(CommonGizmosDataID::InstancesHider)
-              | int(CommonGizmosDataID::Raycaster)
-              | int(CommonGizmosDataID::ObjectClipper));
-}
-
-
-void GLGizmoPainterBase::on_set_state()
-{
-    if (m_state == m_old_state)
-        return;
-
-    if (m_state == On && m_old_state != On) { // the gizmo was just turned on
-        on_opening();
-    }
-    if (m_state == Off && m_old_state != Off) { // the gizmo was just turned Off
-        // we are actually shutting down
-        on_shutdown();
-        m_old_mo_id = -1;
-        //m_iva.release_geometry();
-        m_triangle_selectors.clear();
-    }
-    m_old_state = m_state;
-}
-
-
-
-void GLGizmoPainterBase::on_load(cereal::BinaryInputArchive&)
-{
-    // We should update the gizmo from current ModelObject, but it is not
-    // possible at this point. That would require having updated selection and
-    // common gizmos data, which is not done at this point. Instead, save
-    // a flag to do the update in set_painter_gizmo_data, which will be called
-    // soon after.
-    m_schedule_update = true;
-}
-
-TriangleSelector::ClippingPlane GLGizmoPainterBase::get_clipping_plane_in_volume_coordinates(const Transform3d &trafo) const {
-    const ::Slic3r::GUI::ClippingPlane *const clipping_plane = m_c->object_clipper()->get_clipping_plane();
-    if (clipping_plane == nullptr || !clipping_plane->is_active())
-        return {};
-
-    const Vec3d  clp_normal = clipping_plane->get_normal();
-    const double clp_offset = clipping_plane->get_offset();
-
-    const Transform3d trafo_normal = Transform3d(trafo.linear().transpose());
-    const Transform3d trafo_inv    = trafo.inverse();
-
-    Vec3d point_on_plane             = clp_normal * clp_offset;
-    Vec3d point_on_plane_transformed = trafo_inv * point_on_plane;
-    Vec3d normal_transformed         = trafo_normal * clp_normal;
-    auto offset_transformed          = float(point_on_plane_transformed.dot(normal_transformed));
-
-    return TriangleSelector::ClippingPlane({float(normal_transformed.x()), float(normal_transformed.y()), float(normal_transformed.z()), offset_transformed});
-}
-
-ColorRGBA TriangleSelectorGUI::get_seed_fill_color(const ColorRGBA& base_color)
-{
-    return saturate(base_color, 0.75f);
-}
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-void TriangleSelectorGUI::render(ImGuiWrapper* imgui, const Transform3d& matrix)
-#else
-void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-{
-    static const ColorRGBA enforcers_color = { 0.47f, 0.47f, 1.0f, 1.0f };
-    static const ColorRGBA blockers_color  = { 1.0f, 0.44f, 0.44f, 1.0f };
-
-    if (m_update_render_data) {
-        update_render_data();
-        m_update_render_data = false;
-    }
-
-    auto* shader = wxGetApp().get_current_shader();
-    if (! shader)
-        return;
-
-    assert(shader->get_name() == "gouraud");
-
-    for (auto iva : {std::make_pair(&m_iva_enforcers, enforcers_color),
-                     std::make_pair(&m_iva_blockers, blockers_color)}) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        iva.first->set_color(iva.second);
-        iva.first->render();
-#else
-        if (iva.first->has_VBOs()) {
-            shader->set_uniform("uniform_color", iva.second);
-            iva.first->render();
-        }
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    for (auto& iva : m_iva_seed_fills) {
-        size_t           color_idx = &iva - &m_iva_seed_fills.front();
-        const ColorRGBA& color     = TriangleSelectorGUI::get_seed_fill_color(color_idx == 1 ? enforcers_color :
-            color_idx == 2 ? blockers_color :
-            GLVolume::NEUTRAL_COLOR);
-        iva.set_color(color);
-        iva.render();
-    }
-#else
-    for (auto& iva : m_iva_seed_fills)
-        if (iva.has_VBOs()) {
-            size_t                      color_idx = &iva - &m_iva_seed_fills.front();
-            const ColorRGBA& color                = TriangleSelectorGUI::get_seed_fill_color(color_idx == 1 ? enforcers_color :
-                                                                                             color_idx == 2 ? blockers_color :
-                                                                                                              GLVolume::NEUTRAL_COLOR);
-            shader->set_uniform("uniform_color", color);
-            iva.render();
-        }
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    render_paint_contour(matrix);
-#else
-    render_paint_contour();
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-#else
-    if (m_paint_contour.has_VBO()) {
-        ScopeGuard guard_gouraud([shader]() { shader->start_using(); });
-        shader->stop_using();
-
-        auto *contour_shader = wxGetApp().get_shader("mm_contour");
-        contour_shader->start_using();
-        contour_shader->set_uniform("offset", OpenGLManager::get_gl_info().is_mesa() ? 0.0005 : 0.00001);
-        m_paint_contour.render();
-        contour_shader->stop_using();
-    }
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-#ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
-    if (imgui)
-        render_debug(imgui);
-    else
-        assert(false); // If you want debug output, pass ptr to ImGuiWrapper.
-#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
-}
-
-void TriangleSelectorGUI::update_render_data()
-{
-    int              enf_cnt = 0;
-    int              blc_cnt = 0;
-    std::vector<int> seed_fill_cnt(m_iva_seed_fills.size(), 0);
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    for (auto* iva : { &m_iva_enforcers, &m_iva_blockers }) {
-        iva->reset();
-    }
-
-    for (auto& iva : m_iva_seed_fills) {
-        iva.reset();
-    }
-
-    GLModel::Geometry iva_enforcers_data;
-    iva_enforcers_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };
-    GLModel::Geometry iva_blockers_data;
-    iva_blockers_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };
-    std::array<GLModel::Geometry, 3> iva_seed_fills_data;
-    for (auto& data : iva_seed_fills_data)
-        data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };
-#else
-    for (auto *iva : {&m_iva_enforcers, &m_iva_blockers})
-        iva->release_geometry();
-
-    for (auto &iva : m_iva_seed_fills)
-        iva.release_geometry();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    // small value used to offset triangles along their normal to avoid z-fighting
-    static const float offset = 0.001f;
-
-    for (const Triangle &tr : m_triangles) {
-        if (!tr.valid() || tr.is_split() || (tr.get_state() == EnforcerBlockerType::NONE && !tr.is_selected_by_seed_fill()))
-            continue;
-
-        int tr_state = int(tr.get_state());
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        GLModel::Geometry &iva = tr.is_selected_by_seed_fill()                   ? iva_seed_fills_data[tr_state] :
-                                 tr.get_state() == EnforcerBlockerType::ENFORCER ? iva_enforcers_data :
-                                                                                   iva_blockers_data;
-#else
-        GLIndexedVertexArray &iva = tr.is_selected_by_seed_fill()                   ? m_iva_seed_fills[tr_state] :
-                                    tr.get_state() == EnforcerBlockerType::ENFORCER ? m_iva_enforcers :
-                                                                                      m_iva_blockers;
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        int                  &cnt = tr.is_selected_by_seed_fill()                   ? seed_fill_cnt[tr_state] :
-                                    tr.get_state() == EnforcerBlockerType::ENFORCER ? enf_cnt :
-                                                                                      blc_cnt;
-        const Vec3f          &v0  = m_vertices[tr.verts_idxs[0]].v;
-        const Vec3f          &v1  = m_vertices[tr.verts_idxs[1]].v;
-        const Vec3f          &v2  = m_vertices[tr.verts_idxs[2]].v;
-        //FIXME the normal may likely be pulled from m_triangle_selectors, but it may not be worth the effort
-        // or the current implementation may be more cache friendly.
-        const Vec3f           n   = (v1 - v0).cross(v2 - v1).normalized();
-        // small value used to offset triangles along their normal to avoid z-fighting
-        const Vec3f    offset_n   = offset * n;
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        iva.add_vertex(v0 + offset_n, n);
-        iva.add_vertex(v1 + offset_n, n);
-        iva.add_vertex(v2 + offset_n, n);
-        iva.add_triangle((unsigned int)cnt, (unsigned int)cnt + 1, (unsigned int)cnt + 2);
-#else
-        iva.push_geometry(v0 + offset_n, n);
-        iva.push_geometry(v1 + offset_n, n);
-        iva.push_geometry(v2 + offset_n, n);
-        iva.push_triangle(cnt, cnt + 1, cnt + 2);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        cnt += 3;
-    }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    if (!iva_enforcers_data.is_empty())
-        m_iva_enforcers.init_from(std::move(iva_enforcers_data));
-    if (!iva_blockers_data.is_empty())
-        m_iva_blockers.init_from(std::move(iva_blockers_data));
-    for (size_t i = 0; i < m_iva_seed_fills.size(); ++i) {
-        if (!iva_seed_fills_data[i].is_empty())
-            m_iva_seed_fills[i].init_from(std::move(iva_seed_fills_data[i]));
-    }
-
-    update_paint_contour();
-#else
-    for (auto *iva : {&m_iva_enforcers, &m_iva_blockers})
-        iva->finalize_geometry(true);
-
-    for (auto &iva : m_iva_seed_fills)
-        iva.finalize_geometry(true);
-
-    m_paint_contour.release_geometry();
-    std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();
-    m_paint_contour.contour_vertices.reserve(contour_edges.size() * 6);
-    for (const Vec2i &edge : contour_edges) {
-        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(0)].v.x());
-        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(0)].v.y());
-        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(0)].v.z());
-
-        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(1)].v.x());
-        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(1)].v.y());
-        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(1)].v.z());
-    }
-
-    m_paint_contour.contour_indices.assign(m_paint_contour.contour_vertices.size() / 3, 0);
-    std::iota(m_paint_contour.contour_indices.begin(), m_paint_contour.contour_indices.end(), 0);
-    m_paint_contour.contour_indices_size = m_paint_contour.contour_indices.size();
-
-    m_paint_contour.finalize_geometry();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-}
-
-#if !ENABLE_LEGACY_OPENGL_REMOVAL
-void GLPaintContour::render() const
-{
-    assert(this->m_contour_VBO_id != 0);
-    assert(this->m_contour_EBO_id != 0);
-
-    glsafe(::glLineWidth(4.0f));
-
-    glsafe(::glBindBuffer(GL_ARRAY_BUFFER, this->m_contour_VBO_id));
-    glsafe(::glVertexPointer(3, GL_FLOAT, 3 * sizeof(float), nullptr));
-
-    glsafe(::glEnableClientState(GL_VERTEX_ARRAY));
-
-    if (this->contour_indices_size > 0) {
-        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->m_contour_EBO_id));
-        glsafe(::glDrawElements(GL_LINES, GLsizei(this->contour_indices_size), GL_UNSIGNED_INT, nullptr));
-        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));
-    }
-
-    glsafe(::glDisableClientState(GL_VERTEX_ARRAY));
-
-    glsafe(::glBindBuffer(GL_ARRAY_BUFFER, 0));
-}
-
-void GLPaintContour::finalize_geometry()
-{
-    assert(this->m_contour_VBO_id == 0);
-    assert(this->m_contour_EBO_id == 0);
-
-    if (!this->contour_vertices.empty()) {
-        glsafe(::glGenBuffers(1, &this->m_contour_VBO_id));
-        glsafe(::glBindBuffer(GL_ARRAY_BUFFER, this->m_contour_VBO_id));
-        glsafe(::glBufferData(GL_ARRAY_BUFFER, this->contour_vertices.size() * sizeof(float), this->contour_vertices.data(), GL_STATIC_DRAW));
-        glsafe(::glBindBuffer(GL_ARRAY_BUFFER, 0));
-        this->contour_vertices.clear();
-    }
-
-    if (!this->contour_indices.empty()) {
-        glsafe(::glGenBuffers(1, &this->m_contour_EBO_id));
-        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->m_contour_EBO_id));
-        glsafe(::glBufferData(GL_ELEMENT_ARRAY_BUFFER, this->contour_indices.size() * sizeof(unsigned int), this->contour_indices.data(), GL_STATIC_DRAW));
-        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));
-        this->contour_indices.clear();
-    }
-}
-
-void GLPaintContour::release_geometry()
-{
-    if (this->m_contour_VBO_id) {
-        glsafe(::glDeleteBuffers(1, &this->m_contour_VBO_id));
-        this->m_contour_VBO_id = 0;
-    }
-    if (this->m_contour_EBO_id) {
-        glsafe(::glDeleteBuffers(1, &this->m_contour_EBO_id));
-        this->m_contour_EBO_id = 0;
-    }
-    this->clear();
-}
-#endif // !ENABLE_LEGACY_OPENGL_REMOVAL
-
-#ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
-void TriangleSelectorGUI::render_debug(ImGuiWrapper* imgui)
-{
-    imgui->begin(std::string("TriangleSelector dialog (DEV ONLY)"),
-                 ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);
-    static float edge_limit = 1.f;
-    imgui->text("Edge limit (mm): ");
-    imgui->slider_float("", &edge_limit, 0.1f, 8.f);
-    set_edge_limit(edge_limit);
-    imgui->checkbox("Show split triangles: ", m_show_triangles);
-    imgui->checkbox("Show invalid triangles: ", m_show_invalid);
-
-    int valid_triangles = m_triangles.size() - m_invalid_triangles;
-    imgui->text("Valid triangles: " + std::to_string(valid_triangles) +
-                  "/" + std::to_string(m_triangles.size()));
-    imgui->text("Vertices: " + std::to_string(m_vertices.size()));
-    if (imgui->button("Force garbage collection"))
-        garbage_collect();
-
-    if (imgui->button("Serialize - deserialize")) {
-        auto map = serialize();
-        deserialize(map);
-    }
-
-    imgui->end();
-
-    if (! m_show_triangles)
-        return;
-
-    enum vtype {
-        ORIGINAL = 0,
-        SPLIT,
-        INVALID
-    };
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    for (auto& va : m_varrays)
-        va.reset();
-#else
-    for (auto& va : m_varrays)
-        va.release_geometry();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    std::array<int, 3> cnts;
-
-    ::glScalef(1.01f, 1.01f, 1.01f);
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    std::array<GLModel::Geometry, 3> varrays_data;
-    for (auto& data : varrays_data)
-        data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::UINT };
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    for (int tr_id=0; tr_id<int(m_triangles.size()); ++tr_id) {
-        const Triangle& tr = m_triangles[tr_id];
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        GLModel::Geometry* va = nullptr;
-#else
-        GLIndexedVertexArray* va = nullptr;
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        int* cnt = nullptr;
-        if (tr_id < m_orig_size_indices) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-            va = &varrays_data[ORIGINAL];
-#else
-            va = &m_varrays[ORIGINAL];
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-            cnt = &cnts[ORIGINAL];
-        }
-        else if (tr.valid()) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-            va = &varrays_data[SPLIT];
-#else
-            va = &m_varrays[SPLIT];
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-            cnt = &cnts[SPLIT];
-        }
-        else {
-            if (! m_show_invalid)
-                continue;
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-            va = &varrays_data[INVALID];
-#else
-            va = &m_varrays[INVALID];
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-            cnt = &cnts[INVALID];
-        }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        for (int i = 0; i < 3; ++i) {
-            va->add_vertex(m_vertices[tr.verts_idxs[i]].v, Vec3f(0.0f, 0.0f, 1.0f));
-        }
-        va->add_uint_triangle((unsigned int)*cnt, (unsigned int)*cnt + 1, (unsigned int)*cnt + 2);
-#else
-        for (int i = 0; i < 3; ++i)
-            va->push_geometry(double(m_vertices[tr.verts_idxs[i]].v[0]),
-                              double(m_vertices[tr.verts_idxs[i]].v[1]),
-                              double(m_vertices[tr.verts_idxs[i]].v[2]),
-                              0., 0., 1.);
-        va->push_triangle(*cnt,
-            *cnt + 1,
-            *cnt + 2);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        *cnt += 3;
-    }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    for (int i = 0; i < 3; ++i) {
-        if (!varrays_data[i].is_empty())
-            m_varrays[i].init_from(std::move(varrays_data[i]));
-    }
-#else
-//    for (auto* iva : { &m_iva_enforcers, &m_iva_blockers })
-//        iva->finalize_geometry(true);
-//
-//    for (auto& iva : m_iva_seed_fills)
-//        iva.finalize_geometry(true);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLShaderProgram* curr_shader = wxGetApp().get_current_shader();
-    if (curr_shader != nullptr)
-        curr_shader->stop_using();
-
-    GLShaderProgram* shader = wxGetApp().get_shader("flat");
-    if (shader != nullptr) {
-        shader->start_using();
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Camera& camera = wxGetApp().plater()->get_camera();
-        shader->set_uniform("view_model_matrix", camera.get_view_matrix());
-        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    ::glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
-    for (vtype i : {ORIGINAL, SPLIT, INVALID}) {
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        GLModel& va = m_varrays[i];
-        switch (i) {
-        case ORIGINAL: va.set_color({ 0.0f, 0.0f, 1.0f, 1.0f }); break;
-        case SPLIT:    va.set_color({ 1.0f, 0.0f, 0.0f, 1.0f }); break;
-        case INVALID:  va.set_color({ 1.0f, 1.0f, 0.0f, 1.0f }); break;
-        }
-        va.render();
-#else
-        GLIndexedVertexArray& va = m_varrays[i];
-        va.finalize_geometry(true);
-        if (va.has_VBOs()) {
-            switch (i) {
-            case ORIGINAL : ::glColor3f(0.f, 0.f, 1.f); break;
-            case SPLIT    : ::glColor3f(1.f, 0.f, 0.f); break;
-            case INVALID  : ::glColor3f(1.f, 1.f, 0.f); break;
-            }
-            va.render();
-        }
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-    }
-    ::glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        shader->stop_using();
-    }
-
-    if (curr_shader != nullptr)
-        curr_shader->start_using();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-}
-#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-void TriangleSelectorGUI::update_paint_contour()
-{
-    m_paint_contour.reset();
-
-    GLModel::Geometry init_data;
-    const std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();
-    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3 };
-    init_data.reserve_vertices(2 * contour_edges.size());
-    init_data.reserve_indices(2 * contour_edges.size());
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    init_data.color = ColorRGBA::WHITE();
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-// 
-    // vertices + indices
-    unsigned int vertices_count = 0;
-    for (const Vec2i& edge : contour_edges) {
-        init_data.add_vertex(m_vertices[edge(0)].v);
-        init_data.add_vertex(m_vertices[edge(1)].v);
-        vertices_count += 2;
-        init_data.add_line(vertices_count - 2, vertices_count - 1);
-    }
-
-    if (!init_data.is_empty())
-        m_paint_contour.init_from(std::move(init_data));
-}
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-void TriangleSelectorGUI::render_paint_contour(const Transform3d& matrix)
-#else
-void TriangleSelectorGUI::render_paint_contour()
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-{
-    auto* curr_shader = wxGetApp().get_current_shader();
-    if (curr_shader != nullptr)
-        curr_shader->stop_using();
-
-    auto* contour_shader = wxGetApp().get_shader("mm_contour");
-    if (contour_shader != nullptr) {
-        contour_shader->start_using();
-
-        contour_shader->set_uniform("offset", OpenGLManager::get_gl_info().is_mesa() ? 0.0005 : 0.00001);
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Camera& camera = wxGetApp().plater()->get_camera();
-        contour_shader->set_uniform("view_model_matrix", camera.get_view_matrix() * matrix);
-        contour_shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-        m_paint_contour.render();
-        contour_shader->stop_using();
-    }
-
-    if (curr_shader != nullptr)
-        curr_shader->start_using();
-}
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-} // namespace Slic3r::GUI
+// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.

+#include "GLGizmoPainterBase.hpp"

+#include "slic3r/GUI/GLCanvas3D.hpp"

+#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"

+

+#include <GL/glew.h>

+

+#include "slic3r/GUI/GUI_App.hpp"

+#include "slic3r/GUI/Camera.hpp"

+#include "slic3r/GUI/Plater.hpp"

+#include "slic3r/GUI/OpenGLManager.hpp"

+#include "slic3r/Utils/UndoRedo.hpp"

+#include "libslic3r/Model.hpp"

+#include "libslic3r/PresetBundle.hpp"

+#include "libslic3r/TriangleMesh.hpp"

+

+#include <memory>

+#include <optional>

+

+namespace Slic3r::GUI {

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+std::shared_ptr<GLModel> GLGizmoPainterBase::s_sphere = nullptr;

+#else

+std::shared_ptr<GLIndexedVertexArray> GLGizmoPainterBase::s_sphere = nullptr;

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+GLGizmoPainterBase::GLGizmoPainterBase(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)

+    : GLGizmoBase(parent, icon_filename, sprite_id)

+{

+}

+

+GLGizmoPainterBase::~GLGizmoPainterBase()

+{

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    if (s_sphere != nullptr)

+        s_sphere.reset();

+#else

+    if (s_sphere != nullptr && s_sphere->has_VBOs())

+        s_sphere->release_geometry();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+}

+

+void GLGizmoPainterBase::data_changed()

+{

+    if (m_state != On)

+        return;

+

+    const ModelObject* mo = m_c->selection_info() ? m_c->selection_info()->model_object() : nullptr;

+    const Selection &  selection = m_parent.get_selection();

+    if (mo && selection.is_from_single_instance()

+     && (m_schedule_update || mo->id() != m_old_mo_id || mo->volumes.size() != m_old_volumes_size))

+    {

+        update_from_model_object();

+        m_old_mo_id = mo->id();

+        m_old_volumes_size = mo->volumes.size();

+        m_schedule_update = false;

+    }

+}

+

+GLGizmoPainterBase::ClippingPlaneDataWrapper GLGizmoPainterBase::get_clipping_plane_data() const

+{

+    ClippingPlaneDataWrapper clp_data_out{{0.f, 0.f, 1.f, FLT_MAX}, {-FLT_MAX, FLT_MAX}};

+    // Take care of the clipping plane. The normal of the clipping plane is

+    // saved with opposite sign than we need to pass to OpenGL (FIXME)

+    if (bool clipping_plane_active = m_c->object_clipper()->get_position() != 0.; clipping_plane_active) {

+        const ClippingPlane *clp = m_c->object_clipper()->get_clipping_plane();

+        for (size_t i = 0; i < 3; ++i)

+            clp_data_out.clp_dataf[i] = -1.f * float(clp->get_data()[i]);

+        clp_data_out.clp_dataf[3] = float(clp->get_data()[3]);

+    }

+

+    // z_range is calculated in the same way as in GLCanvas3D::_render_objects(GLVolumeCollection::ERenderType type)

+    if (m_c->get_canvas()->get_use_clipping_planes()) {

+        const std::array<ClippingPlane, 2> &clps = m_c->get_canvas()->get_clipping_planes();

+        clp_data_out.z_range                     = {float(-clps[0].get_data()[3]), float(clps[1].get_data()[3])};

+    }

+

+    return clp_data_out;

+}

+

+void GLGizmoPainterBase::render_triangles(const Selection& selection) const

+{

+    auto* shader = wxGetApp().get_shader("gouraud");

+    if (! shader)

+        return;

+    shader->start_using();

+    shader->set_uniform("slope.actived", false);

+    shader->set_uniform("print_volume.type", 0);

+    shader->set_uniform("clipping_plane", this->get_clipping_plane_data().clp_dataf);

+    ScopeGuard guard([shader]() { if (shader) shader->stop_using(); });

+

+    const ModelObject *mo      = m_c->selection_info()->model_object();

+    int                mesh_id = -1;

+    for (const ModelVolume* mv : mo->volumes) {

+        if (! mv->is_model_part())

+            continue;

+

+        ++mesh_id;

+

+        const Transform3d trafo_matrix =

+            mo->instances[selection.get_instance_idx()]->get_transformation().get_matrix() *

+            mv->get_matrix();

+

+        bool is_left_handed = trafo_matrix.matrix().determinant() < 0.;

+        if (is_left_handed)

+            glsafe(::glFrontFace(GL_CW));

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Camera& camera = wxGetApp().plater()->get_camera();

+        const Transform3d matrix = camera.get_view_matrix() * trafo_matrix;

+        shader->set_uniform("view_model_matrix", matrix);

+        shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+        shader->set_uniform("normal_matrix", (Matrix3d)matrix.matrix().block(0, 0, 3, 3).inverse().transpose());

+#else

+        glsafe(::glPushMatrix());

+        glsafe(::glMultMatrixd(trafo_matrix.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+        // For printers with multiple extruders, it is necessary to pass trafo_matrix

+        // to the shader input variable print_box.volume_world_matrix before

+        // rendering the painted triangles. When this matrix is not set, the

+        // wrong transformation matrix is used for "Clipping of view".

+        shader->set_uniform("volume_world_matrix", trafo_matrix);

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        m_triangle_selectors[mesh_id]->render(m_imgui, trafo_matrix);

+#else

+        m_triangle_selectors[mesh_id]->render(m_imgui);

+

+        glsafe(::glPopMatrix());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        if (is_left_handed)

+            glsafe(::glFrontFace(GL_CCW));

+    }

+}

+

+void GLGizmoPainterBase::render_cursor()

+{

+    // First check that the mouse pointer is on an object.

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    const Selection& selection = m_parent.get_selection();

+    const ModelInstance* mi = mo->instances[selection.get_instance_idx()];

+    const Camera& camera = wxGetApp().plater()->get_camera();

+

+    // Precalculate transformations of individual meshes.

+    std::vector<Transform3d> trafo_matrices;

+    for (const ModelVolume* mv : mo->volumes) {

+        if (mv->is_model_part())

+            trafo_matrices.emplace_back(mi->get_transformation().get_matrix() * mv->get_matrix());

+    }

+    // Raycast and return if there's no hit.

+    update_raycast_cache(m_parent.get_local_mouse_position(), camera, trafo_matrices);

+    if (m_rr.mesh_id == -1)

+        return;

+

+    if (m_tool_type == ToolType::BRUSH) {

+        if (m_cursor_type == TriangleSelector::SPHERE)

+            render_cursor_sphere(trafo_matrices[m_rr.mesh_id]);

+        else if (m_cursor_type == TriangleSelector::CIRCLE)

+            render_cursor_circle();

+    }

+}

+

+void GLGizmoPainterBase::render_cursor_circle()

+{

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+    const Camera &camera   = wxGetApp().plater()->get_camera();

+    const float   zoom     = float(camera.get_zoom());

+    const float   inv_zoom = (zoom != 0.0f) ? 1.0f / zoom : 0.0f;

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+

+    const Size cnv_size = m_parent.get_canvas_size();

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    const float cnv_width  = float(cnv_size.get_width());

+    const float cnv_height = float(cnv_size.get_height());

+    if (cnv_width == 0.0f || cnv_height == 0.0f)

+        return;

+

+    const float cnv_inv_width  = 1.0f / cnv_width;

+    const float cnv_inv_height = 1.0f / cnv_height;

+

+    const Vec2d center = m_parent.get_local_mouse_position();

+    const float radius = m_cursor_radius * float(wxGetApp().plater()->get_camera().get_zoom());

+#else

+    const float cnv_half_width  = 0.5f * float(cnv_size.get_width());

+    const float cnv_half_height = 0.5f * float(cnv_size.get_height());

+    if (cnv_half_width == 0.0f || cnv_half_height == 0.0f)

+        return;

+    const Vec2d mouse_pos(m_parent.get_local_mouse_position().x(), m_parent.get_local_mouse_position().y());

+    Vec2d center(mouse_pos.x() - cnv_half_width, cnv_half_height - mouse_pos.y());

+    center = center * inv_zoom;

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+    glsafe(::glLineWidth(1.5f));

+#if !ENABLE_LEGACY_OPENGL_REMOVAL

+    static const std::array<float, 3> color = { 0.f, 1.f, 0.3f };

+    glsafe(::glColor3fv(color.data()));

+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL

+    glsafe(::glDisable(GL_DEPTH_TEST));

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+    glsafe(::glPushMatrix());

+    glsafe(::glLoadIdentity());

+    // ensure that the circle is renderered inside the frustrum

+    glsafe(::glTranslated(0.0, 0.0, -(camera.get_near_z() + 0.5)));

+    // ensure that the overlay fits the frustrum near z plane

+    const double gui_scale = camera.get_gui_scale();

+    glsafe(::glScaled(gui_scale, gui_scale, 1.0));

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+

+    glsafe(::glPushAttrib(GL_ENABLE_BIT));

+    glsafe(::glLineStipple(4, 0xAAAA));

+    glsafe(::glEnable(GL_LINE_STIPPLE));

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    if (!m_circle.is_initialized() || !m_old_center.isApprox(center) || std::abs(m_old_cursor_radius - radius) > EPSILON) {

+        m_old_cursor_radius = radius;

+#else

+    if (!m_circle.is_initialized() || !m_old_center.isApprox(center) || std::abs(m_old_cursor_radius - m_cursor_radius) > EPSILON) {

+        m_old_cursor_radius = m_cursor_radius;

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        m_old_center = center;

+        m_circle.reset();

+

+        GLModel::Geometry init_data;

+        static const unsigned int StepsCount = 32;

+        static const float StepSize = 2.0f * float(PI) / float(StepsCount);

+        init_data.format = { GLModel::Geometry::EPrimitiveType::LineLoop, GLModel::Geometry::EVertexLayout::P2 };

+        init_data.color  = { 0.0f, 1.0f, 0.3f, 1.0f };

+        init_data.reserve_vertices(StepsCount);

+        init_data.reserve_indices(StepsCount);

+

+        // vertices + indices

+        for (unsigned int i = 0; i < StepsCount; ++i) {

+            const float angle = float(i) * StepSize;

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+            init_data.add_vertex(Vec2f(2.0f * ((center.x() + ::cos(angle) * radius) * cnv_inv_width - 0.5f),

+                                       -2.0f * ((center.y() + ::sin(angle) * radius) * cnv_inv_height - 0.5f)));

+#else

+            init_data.add_vertex(Vec2f(center.x() + ::cos(angle) * m_cursor_radius, center.y() + ::sin(angle) * m_cursor_radius));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+            init_data.add_index(i);

+        }

+

+        m_circle.init_from(std::move(init_data));

+    }

+

+    GLShaderProgram* shader = GUI::wxGetApp().get_shader("flat");

+    if (shader != nullptr) {

+        shader->start_using();

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        shader->set_uniform("view_model_matrix", Transform3d::Identity());

+        shader->set_uniform("projection_matrix", Transform3d::Identity());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        m_circle.render();

+        shader->stop_using();

+    }

+#else

+    ::glBegin(GL_LINE_LOOP);

+    for (double angle=0; angle<2*M_PI; angle+=M_PI/20.)

+        ::glVertex2f(GLfloat(center.x()+m_cursor_radius*cos(angle)), GLfloat(center.y()+m_cursor_radius*sin(angle)));

+    glsafe(::glEnd());

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    glsafe(::glPopAttrib());

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+    glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+    glsafe(::glEnable(GL_DEPTH_TEST));

+}

+

+

+void GLGizmoPainterBase::render_cursor_sphere(const Transform3d& trafo) const

+{

+    if (s_sphere == nullptr) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        s_sphere = std::make_shared<GLModel>();

+        s_sphere->init_from(its_make_sphere(1.0, double(PI) / 12.0));

+#else

+        s_sphere = std::make_shared<GLIndexedVertexArray>();

+        s_sphere->load_its_flat_shading(its_make_sphere(1.0, double(PI) / 12.0));

+        s_sphere->finalize_geometry(true);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLShaderProgram* shader = wxGetApp().get_shader("flat");

+    if (shader == nullptr)

+        return;

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d complete_scaling_matrix_inverse = Geometry::Transformation(trafo).get_scaling_factor_matrix().inverse();

+#else

+    const Transform3d complete_scaling_matrix_inverse = Geometry::Transformation(trafo).get_matrix(true, true, false, true).inverse();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const bool is_left_handed = Geometry::Transformation(trafo).is_left_handed();

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+    glsafe(::glPushMatrix());

+    glsafe(::glMultMatrixd(trafo.data()));

+    // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.

+    glsafe(::glTranslatef(m_rr.hit.x(), m_rr.hit.y(), m_rr.hit.z()));

+    glsafe(::glMultMatrixd(complete_scaling_matrix_inverse.data()));

+    glsafe(::glScaled(m_cursor_radius, m_cursor_radius, m_cursor_radius));

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+

+    if (is_left_handed)

+        glFrontFace(GL_CW);

+

+    ColorRGBA render_color = { 0.0f, 0.0f, 0.0f, 0.25f };

+    if (m_button_down == Button::Left)

+        render_color = this->get_cursor_sphere_left_button_color();

+    else if (m_button_down == Button::Right)

+        render_color = this->get_cursor_sphere_right_button_color();

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    shader->start_using();

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    const Camera& camera = wxGetApp().plater()->get_camera();

+    Transform3d view_model_matrix = camera.get_view_matrix() * trafo *

+        Geometry::assemble_transform(m_rr.hit.cast<double>()) * complete_scaling_matrix_inverse *

+        Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), m_cursor_radius * Vec3d::Ones());

+

+    shader->set_uniform("view_model_matrix", view_model_matrix);

+    shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+    assert(s_sphere != nullptr);

+    s_sphere->set_color(render_color);

+#else

+    glsafe(::glColor4fv(render_color.data()));

+

+    assert(s_sphere != nullptr);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    s_sphere->render();

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    shader->stop_using();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    if (is_left_handed)

+        glFrontFace(GL_CCW);

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+    glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+}

+

+

+bool GLGizmoPainterBase::is_mesh_point_clipped(const Vec3d& point, const Transform3d& trafo) const

+{

+    if (m_c->object_clipper()->get_position() == 0.)

+        return false;

+

+    auto sel_info = m_c->selection_info();

+    Vec3d transformed_point =  trafo * point;

+    transformed_point(2) += sel_info->get_sla_shift();

+    return m_c->object_clipper()->get_clipping_plane()->is_point_clipped(transformed_point);

+}

+

+// Interpolate points between the previous and current mouse positions, which are then projected onto the object.

+// Returned projected mouse positions are grouped by mesh_idx. It may contain multiple std::vector<GLGizmoPainterBase::ProjectedMousePosition>

+// with the same mesh_idx, but all items in std::vector<GLGizmoPainterBase::ProjectedMousePosition> always have the same mesh_idx.

+std::vector<std::vector<GLGizmoPainterBase::ProjectedMousePosition>> GLGizmoPainterBase::get_projected_mouse_positions(const Vec2d &mouse_position, const double resolution, const std::vector<Transform3d> &trafo_matrices) const

+{

+    // List of mouse positions that will be used as seeds for painting.

+    std::vector<Vec2d> mouse_positions{mouse_position};

+    if (m_last_mouse_click != Vec2d::Zero()) {

+        // In case current mouse position is far from the last one,

+        // add several positions from between into the list, so there

+        // are no gaps in the painted region.

+        if (size_t patches_in_between = size_t((mouse_position - m_last_mouse_click).norm() / resolution); patches_in_between > 0) {

+            const Vec2d diff = (m_last_mouse_click - mouse_position) / (patches_in_between + 1);

+            for (size_t patch_idx = 1; patch_idx <= patches_in_between; ++patch_idx)

+                mouse_positions.emplace_back(mouse_position + patch_idx * diff);

+            mouse_positions.emplace_back(m_last_mouse_click);

+        }

+    }

+

+    const Camera                       &camera = wxGetApp().plater()->get_camera();

+    std::vector<ProjectedMousePosition> mesh_hit_points;

+    mesh_hit_points.reserve(mouse_positions.size());

+

+    // In mesh_hit_points only the last item could have mesh_id == -1, any other items mustn't.

+    for (const Vec2d &mp : mouse_positions) {

+        update_raycast_cache(mp, camera, trafo_matrices);

+        mesh_hit_points.push_back({m_rr.hit, m_rr.mesh_id, m_rr.facet});

+        if (m_rr.mesh_id == -1)

+            break;

+    }

+

+    // Divide mesh_hit_points into groups with the same mesh_idx. It may contain multiple groups with the same mesh_idx.

+    std::vector<std::vector<ProjectedMousePosition>> mesh_hit_points_by_mesh;

+    for (size_t prev_mesh_hit_point = 0, curr_mesh_hit_point = 0; curr_mesh_hit_point < mesh_hit_points.size(); ++curr_mesh_hit_point) {

+        size_t next_mesh_hit_point = curr_mesh_hit_point + 1;

+        if (next_mesh_hit_point >= mesh_hit_points.size() || mesh_hit_points[curr_mesh_hit_point].mesh_idx != mesh_hit_points[next_mesh_hit_point].mesh_idx) {

+            mesh_hit_points_by_mesh.emplace_back();

+            mesh_hit_points_by_mesh.back().insert(mesh_hit_points_by_mesh.back().end(), mesh_hit_points.begin() + int(prev_mesh_hit_point), mesh_hit_points.begin() + int(next_mesh_hit_point));

+            prev_mesh_hit_point = next_mesh_hit_point;

+        }

+    }

+

+    auto on_same_facet = [](std::vector<ProjectedMousePosition> &hit_points) -> bool {

+        for (const ProjectedMousePosition &mesh_hit_point : hit_points)

+            if (mesh_hit_point.facet_idx != hit_points.front().facet_idx)

+                return false;

+        return true;

+    };

+

+    struct Plane

+    {

+        Vec3d origin;

+        Vec3d first_axis;

+        Vec3d second_axis;

+    };

+    auto find_plane = [](std::vector<ProjectedMousePosition> &hit_points) -> std::optional<Plane> {

+        assert(hit_points.size() >= 3);

+        for (size_t third_idx = 2; third_idx < hit_points.size(); ++third_idx) {

+            const Vec3d &first_point  = hit_points[third_idx - 2].mesh_hit.cast<double>();

+            const Vec3d &second_point = hit_points[third_idx - 1].mesh_hit.cast<double>();

+            const Vec3d &third_point  = hit_points[third_idx].mesh_hit.cast<double>();

+

+            const Vec3d  first_vec    = first_point - second_point;

+            const Vec3d  second_vec   = third_point - second_point;

+

+            // If three points aren't collinear, then there exists only one plane going through all points.

+            if (first_vec.cross(second_vec).squaredNorm() > sqr(EPSILON)) {

+                const Vec3d first_axis_vec_n = first_vec.normalized();

+                // Make second_vec perpendicular to first_axis_vec_n using Gram–Schmidt orthogonalization process

+                const Vec3d second_axis_vec_n = (second_vec - (first_vec.dot(second_vec) / first_vec.dot(first_vec)) * first_vec).normalized();

+                return Plane{second_point, first_axis_vec_n, second_axis_vec_n};

+            }

+        }

+

+        return std::nullopt;

+    };

+

+    for(std::vector<ProjectedMousePosition> &hit_points : mesh_hit_points_by_mesh) {

+        assert(!hit_points.empty());

+        if (hit_points.back().mesh_idx == -1)

+            break;

+

+        if (hit_points.size() <= 2)

+            continue;

+

+        if (on_same_facet(hit_points)) {

+            hit_points = {hit_points.front(), hit_points.back()};

+        } else if (std::optional<Plane> plane = find_plane(hit_points); plane) {

+            Polyline polyline;

+            polyline.points.reserve(hit_points.size());

+            // Project hit_points into its plane to simplified them in the next step.

+            for (auto &hit_point : hit_points) {

+                const Vec3d &point  = hit_point.mesh_hit.cast<double>();

+                const double x_cord = plane->first_axis.dot(point - plane->origin);

+                const double y_cord = plane->second_axis.dot(point - plane->origin);

+                polyline.points.emplace_back(scale_(x_cord), scale_(y_cord));

+            }

+

+            polyline.simplify(scale_(m_cursor_radius) / 10.);

+

+            const int                           mesh_idx = hit_points.front().mesh_idx;

+            std::vector<ProjectedMousePosition> new_hit_points;

+            new_hit_points.reserve(polyline.points.size());

+            // Project 2D simplified hit_points beck to 3D.

+            for (const Point &point : polyline.points) {

+                const double x_cord        = unscale<double>(point.x());

+                const double y_cord        = unscale<double>(point.y());

+                const Vec3d  new_hit_point = plane->origin + x_cord * plane->first_axis + y_cord * plane->second_axis;

+                const int    facet_idx     = m_c->raycaster()->raycasters()[mesh_idx]->get_closest_facet(new_hit_point.cast<float>());

+                new_hit_points.push_back({new_hit_point.cast<float>(), mesh_idx, size_t(facet_idx)});

+            }

+

+            hit_points = new_hit_points;

+        } else {

+            hit_points = {hit_points.front(), hit_points.back()};

+        }

+    }

+

+    return mesh_hit_points_by_mesh;

+}

+

+// Following function is called from GLCanvas3D to inform the gizmo about a mouse/keyboard event.

+// The gizmo has an opportunity to react - if it does, it should return true so that the Canvas3D is

+// aware that the event was reacted to and stops trying to make different sense of it. If the gizmo

+// concludes that the event was not intended for it, it should return false.

+bool GLGizmoPainterBase::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)

+{

+    if (action == SLAGizmoEventType::MouseWheelUp

+     || action == SLAGizmoEventType::MouseWheelDown) {

+        if (control_down) {

+            double pos = m_c->object_clipper()->get_position();

+            pos = action == SLAGizmoEventType::MouseWheelDown

+                      ? std::max(0., pos - 0.01)

+                      : std::min(1., pos + 0.01);

+            m_c->object_clipper()->set_position(pos, true);

+            return true;

+        }

+        else if (alt_down) {

+            if (m_tool_type == ToolType::BRUSH && (m_cursor_type == TriangleSelector::CursorType::SPHERE || m_cursor_type == TriangleSelector::CursorType::CIRCLE)) {

+                m_cursor_radius = action == SLAGizmoEventType::MouseWheelDown ? std::max(m_cursor_radius - this->get_cursor_radius_step(), this->get_cursor_radius_min())

+                                                                              : std::min(m_cursor_radius + this->get_cursor_radius_step(), this->get_cursor_radius_max());

+                m_parent.set_as_dirty();

+                return true;

+            } else if (m_tool_type == ToolType::SMART_FILL) {

+                m_smart_fill_angle = action == SLAGizmoEventType::MouseWheelDown ? std::max(m_smart_fill_angle - SmartFillAngleStep, SmartFillAngleMin)

+                                                                                : std::min(m_smart_fill_angle + SmartFillAngleStep, SmartFillAngleMax);

+                m_parent.set_as_dirty();

+                if (m_rr.mesh_id != -1) {

+                    const Selection     &selection                 = m_parent.get_selection();

+                    const ModelObject   *mo                        = m_c->selection_info()->model_object();

+                    const ModelInstance *mi                        = mo->instances[selection.get_instance_idx()];

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    const Transform3d   trafo_matrix_not_translate = mi->get_transformation().get_matrix_no_offset() * mo->volumes[m_rr.mesh_id]->get_matrix_no_offset();

+#else

+                    const Transform3d   trafo_matrix_not_translate = mi->get_transformation().get_matrix(true) * mo->volumes[m_rr.mesh_id]->get_matrix(true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    const Transform3d   trafo_matrix = mi->get_transformation().get_matrix() * mo->volumes[m_rr.mesh_id]->get_matrix();

+                    m_triangle_selectors[m_rr.mesh_id]->seed_fill_select_triangles(m_rr.hit, int(m_rr.facet), trafo_matrix_not_translate, this->get_clipping_plane_in_volume_coordinates(trafo_matrix), m_smart_fill_angle,

+                                                                                   m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f, true);

+                    m_triangle_selectors[m_rr.mesh_id]->request_update_render_data();

+                    m_seed_fill_last_mesh_id = m_rr.mesh_id;

+                }

+                return true;

+            }

+

+            return false;

+        }

+    }

+

+    if (action == SLAGizmoEventType::ResetClippingPlane) {

+        m_c->object_clipper()->set_position(-1., false);

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::LeftDown

+     || action == SLAGizmoEventType::RightDown

+    || (action == SLAGizmoEventType::Dragging && m_button_down != Button::None)) {

+

+        if (m_triangle_selectors.empty())

+            return false;

+

+        EnforcerBlockerType new_state = EnforcerBlockerType::NONE;

+        if (! shift_down) {

+            if (action == SLAGizmoEventType::Dragging)

+                new_state = m_button_down == Button::Left ? this->get_left_button_state_type() : this->get_right_button_state_type();

+            else

+                new_state = action == SLAGizmoEventType::LeftDown ? this->get_left_button_state_type() : this->get_right_button_state_type();

+        }

+

+        const Camera        &camera                      = wxGetApp().plater()->get_camera();

+        const Selection     &selection                   = m_parent.get_selection();

+        const ModelObject   *mo                          = m_c->selection_info()->model_object();

+        const ModelInstance *mi                          = mo->instances[selection.get_instance_idx()];

+        const Transform3d   instance_trafo               = mi->get_transformation().get_matrix();

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        const Transform3d   instance_trafo_not_translate = mi->get_transformation().get_matrix_no_offset();

+#else

+        const Transform3d   instance_trafo_not_translate = mi->get_transformation().get_matrix(true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+

+        // Precalculate transformations of individual meshes.

+        std::vector<Transform3d> trafo_matrices;

+        std::vector<Transform3d> trafo_matrices_not_translate;

+        for (const ModelVolume *mv : mo->volumes)

+            if (mv->is_model_part()) {

+                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                trafo_matrices_not_translate.emplace_back(instance_trafo_not_translate * mv->get_matrix_no_offset());

+#else

+                trafo_matrices_not_translate.emplace_back(instance_trafo_not_translate * mv->get_matrix(true));

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+            }

+

+        std::vector<std::vector<ProjectedMousePosition>> projected_mouse_positions_by_mesh = get_projected_mouse_positions(mouse_position, 1., trafo_matrices);

+        m_last_mouse_click = Vec2d::Zero(); // only actual hits should be saved

+

+        for (const std::vector<ProjectedMousePosition> &projected_mouse_positions : projected_mouse_positions_by_mesh) {

+            assert(!projected_mouse_positions.empty());

+            const int  mesh_idx                = projected_mouse_positions.front().mesh_idx;

+            const bool dragging_while_painting = (action == SLAGizmoEventType::Dragging && m_button_down != Button::None);

+

+            // The mouse button click detection is enabled when there is a valid hit.

+            // Missing the object entirely

+            // shall not capture the mouse.

+            if (mesh_idx != -1)

+                if (m_button_down == Button::None)

+                    m_button_down = ((action == SLAGizmoEventType::LeftDown) ? Button::Left : Button::Right);

+

+            // In case we have no valid hit, we can return. The event will be stopped when

+            // dragging while painting (to prevent scene rotations and moving the object)

+            if (mesh_idx == -1)

+                return dragging_while_painting;

+

+            const Transform3d &trafo_matrix               = trafo_matrices[mesh_idx];

+            const Transform3d &trafo_matrix_not_translate = trafo_matrices_not_translate[mesh_idx];

+

+            // Calculate direction from camera to the hit (in mesh coords):

+            Vec3f camera_pos = (trafo_matrix.inverse() * camera.get_position()).cast<float>();

+

+            assert(mesh_idx < int(m_triangle_selectors.size()));

+            const TriangleSelector::ClippingPlane &clp = this->get_clipping_plane_in_volume_coordinates(trafo_matrix);

+            if (m_tool_type == ToolType::SMART_FILL || m_tool_type == ToolType::BUCKET_FILL || (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER)) {

+                for(const ProjectedMousePosition &projected_mouse_position : projected_mouse_positions) {

+                    assert(projected_mouse_position.mesh_idx == mesh_idx);

+                    const Vec3f mesh_hit = projected_mouse_position.mesh_hit;

+                    const int facet_idx = int(projected_mouse_position.facet_idx);

+                    m_triangle_selectors[mesh_idx]->seed_fill_apply_on_triangles(new_state);

+                    if (m_tool_type == ToolType::SMART_FILL)

+                        m_triangle_selectors[mesh_idx]->seed_fill_select_triangles(mesh_hit, facet_idx, trafo_matrix_not_translate, clp, m_smart_fill_angle,

+                                                                                       m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f, true);

+                    else if (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER)

+                        m_triangle_selectors[mesh_idx]->bucket_fill_select_triangles(mesh_hit, facet_idx, clp, false, true);

+                    else if (m_tool_type == ToolType::BUCKET_FILL)

+                        m_triangle_selectors[mesh_idx]->bucket_fill_select_triangles(mesh_hit, facet_idx, clp, true, true);

+

+                    m_seed_fill_last_mesh_id = -1;

+                }

+            } else if (m_tool_type == ToolType::BRUSH) {

+                assert(m_cursor_type == TriangleSelector::CursorType::CIRCLE || m_cursor_type == TriangleSelector::CursorType::SPHERE);

+

+                if (projected_mouse_positions.size() == 1) {

+                    const ProjectedMousePosition             &first_position = projected_mouse_positions.front();

+                    std::unique_ptr<TriangleSelector::Cursor> cursor         = TriangleSelector::SinglePointCursor::cursor_factory(first_position.mesh_hit,

+                                                                                                                                   camera_pos, m_cursor_radius,

+                                                                                                                                   m_cursor_type, trafo_matrix, clp);

+                    m_triangle_selectors[mesh_idx]->select_patch(int(first_position.facet_idx), std::move(cursor), new_state, trafo_matrix_not_translate,

+                                                                 m_triangle_splitting_enabled, m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f);

+                } else {

+                    for (auto first_position_it = projected_mouse_positions.cbegin(); first_position_it != projected_mouse_positions.cend() - 1; ++first_position_it) {

+                        auto second_position_it = first_position_it + 1;

+                        std::unique_ptr<TriangleSelector::Cursor> cursor = TriangleSelector::DoublePointCursor::cursor_factory(first_position_it->mesh_hit, second_position_it->mesh_hit, camera_pos, m_cursor_radius, m_cursor_type, trafo_matrix, clp);

+                        m_triangle_selectors[mesh_idx]->select_patch(int(first_position_it->facet_idx), std::move(cursor), new_state, trafo_matrix_not_translate, m_triangle_splitting_enabled, m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f);

+                    }

+                }

+            }

+

+            m_triangle_selectors[mesh_idx]->request_update_render_data();

+            m_last_mouse_click = mouse_position;

+        }

+

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::Moving && (m_tool_type == ToolType::SMART_FILL || m_tool_type == ToolType::BUCKET_FILL || (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER))) {

+        if (m_triangle_selectors.empty())

+            return false;

+

+        const Camera        &camera                       = wxGetApp().plater()->get_camera();

+        const Selection     &selection                    = m_parent.get_selection();

+        const ModelObject   *mo                           = m_c->selection_info()->model_object();

+        const ModelInstance *mi                           = mo->instances[selection.get_instance_idx()];

+        const Transform3d    instance_trafo               = mi->get_transformation().get_matrix();

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        const Transform3d    instance_trafo_not_translate = mi->get_transformation().get_matrix_no_offset();

+#else

+        const Transform3d    instance_trafo_not_translate = mi->get_transformation().get_matrix(true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+

+        // Precalculate transformations of individual meshes.

+        std::vector<Transform3d> trafo_matrices;

+        std::vector<Transform3d> trafo_matrices_not_translate;

+        for (const ModelVolume *mv : mo->volumes)

+            if (mv->is_model_part()) {

+                trafo_matrices.emplace_back(instance_trafo * mv->get_matrix());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                trafo_matrices_not_translate.emplace_back(instance_trafo_not_translate * mv->get_matrix_no_offset());

+#else

+                trafo_matrices_not_translate.emplace_back(instance_trafo_not_translate * mv->get_matrix(true));

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+            }

+

+        // Now "click" into all the prepared points and spill paint around them.

+        update_raycast_cache(mouse_position, camera, trafo_matrices);

+

+        auto seed_fill_unselect_all = [this]() {

+            for (auto &triangle_selector : m_triangle_selectors) {

+                triangle_selector->seed_fill_unselect_all_triangles();

+                triangle_selector->request_update_render_data();

+            }

+        };

+

+        if (m_rr.mesh_id == -1) {

+            // Clean selected by seed fill for all triangles in all meshes when a mouse isn't pointing on any mesh.

+            seed_fill_unselect_all();

+            m_seed_fill_last_mesh_id = -1;

+

+            // In case we have no valid hit, we can return.

+            return false;

+        }

+

+        // The mouse moved from one object's volume to another one. So it is needed to unselect all triangles selected by seed fill.

+        if(m_rr.mesh_id != m_seed_fill_last_mesh_id)

+            seed_fill_unselect_all();

+

+        const Transform3d &trafo_matrix = trafo_matrices[m_rr.mesh_id];

+        const Transform3d &trafo_matrix_not_translate = trafo_matrices_not_translate[m_rr.mesh_id];

+

+        assert(m_rr.mesh_id < int(m_triangle_selectors.size()));

+        const TriangleSelector::ClippingPlane &clp = this->get_clipping_plane_in_volume_coordinates(trafo_matrix);

+        if (m_tool_type == ToolType::SMART_FILL)

+            m_triangle_selectors[m_rr.mesh_id]->seed_fill_select_triangles(m_rr.hit, int(m_rr.facet), trafo_matrix_not_translate, clp, m_smart_fill_angle,

+                                                                           m_paint_on_overhangs_only ? m_highlight_by_angle_threshold_deg : 0.f);

+        else if (m_tool_type == ToolType::BRUSH && m_cursor_type == TriangleSelector::CursorType::POINTER)

+            m_triangle_selectors[m_rr.mesh_id]->bucket_fill_select_triangles(m_rr.hit, int(m_rr.facet), clp, false);

+        else if (m_tool_type == ToolType::BUCKET_FILL)

+            m_triangle_selectors[m_rr.mesh_id]->bucket_fill_select_triangles(m_rr.hit, int(m_rr.facet), clp, true);

+        m_triangle_selectors[m_rr.mesh_id]->request_update_render_data();

+        m_seed_fill_last_mesh_id = m_rr.mesh_id;

+        return true;

+    }

+

+    if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::RightUp)

+      && m_button_down != Button::None) {

+        // Take snapshot and update ModelVolume data.

+        wxString action_name = this->handle_snapshot_action_name(shift_down, m_button_down);

+        Plater::TakeSnapshot snapshot(wxGetApp().plater(), action_name, UndoRedo::SnapshotType::GizmoAction);

+        update_model_object();

+

+        m_button_down = Button::None;

+        m_last_mouse_click = Vec2d::Zero();

+        return true;

+    }

+

+    return false;

+}

+

+bool GLGizmoPainterBase::on_mouse(const wxMouseEvent &mouse_event)

+{

+    // wxCoord == int --> wx/types.h

+    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());

+    Vec2d mouse_pos = mouse_coord.cast<double>();

+

+    if (mouse_event.Moving()) {

+        gizmo_event(SLAGizmoEventType::Moving, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false);

+        return false;

+    }

+

+    // when control is down we allow scene pan and rotation even when clicking

+    // over some object

+    bool control_down           = mouse_event.CmdDown();

+    bool grabber_contains_mouse = (get_hover_id() != -1);

+

+    const Selection &selection = m_parent.get_selection();

+    int selected_object_idx = selection.get_object_idx();

+    if (mouse_event.LeftDown()) {

+        if ((!control_down || grabber_contains_mouse) &&            

+            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))

+            // the gizmo got the event and took some action, there is no need

+            // to do anything more

+            return true;

+    } else if (mouse_event.RightDown()){

+        if (!control_down && selected_object_idx != -1 &&

+            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) 

+            // event was taken care of

+            return true;

+    } else if (mouse_event.Dragging()) {

+        if (m_parent.get_move_volume_id() != -1)

+            // don't allow dragging objects with the Sla gizmo on

+            return true;

+        if (!control_down && gizmo_event(SLAGizmoEventType::Dragging,

+                                         mouse_pos, mouse_event.ShiftDown(),

+                                         mouse_event.AltDown(), false)) {

+            // the gizmo got the event and took some action, no need to do

+            // anything more here

+            m_parent.set_as_dirty();

+            return true;

+        }

+        if(control_down && (mouse_event.LeftIsDown() || mouse_event.RightIsDown()))

+        {

+            // CTRL has been pressed while already dragging -> stop current action

+            if (mouse_event.LeftIsDown())

+                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);

+            else if (mouse_event.RightIsDown())

+                gizmo_event(SLAGizmoEventType::RightUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);

+            return false;

+        }

+    } else if (mouse_event.LeftUp()) {

+        if (!m_parent.is_mouse_dragging()) {

+            // in case SLA/FDM gizmo is selected, we just pass the LeftUp

+            // event and stop processing - neither object moving or selecting

+            // is suppressed in that case

+            gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), control_down);

+            return true;

+        }

+    } else if (mouse_event.RightUp()) {

+        if (!m_parent.is_mouse_dragging()) {

+            gizmo_event(SLAGizmoEventType::RightUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), control_down);

+            return true;

+        }

+    }

+    return false;

+}

+

+void GLGizmoPainterBase::update_raycast_cache(const Vec2d& mouse_position,

+                                              const Camera& camera,

+                                              const std::vector<Transform3d>& trafo_matrices) const

+{

+    if (m_rr.mouse_position == mouse_position) {

+        // Same query as last time - the answer is already in the cache.

+        return;

+    }

+

+    Vec3f normal =  Vec3f::Zero();

+    Vec3f hit = Vec3f::Zero();

+    size_t facet = 0;

+    Vec3f closest_hit = Vec3f::Zero();

+    double closest_hit_squared_distance = std::numeric_limits<double>::max();

+    size_t closest_facet = 0;

+    int closest_hit_mesh_id = -1;

+

+    // Cast a ray on all meshes, pick the closest hit and save it for the respective mesh

+    for (int mesh_id = 0; mesh_id < int(trafo_matrices.size()); ++mesh_id) {

+

+        if (m_c->raycaster()->raycasters()[mesh_id]->unproject_on_mesh(

+                   mouse_position,

+                   trafo_matrices[mesh_id],

+                   camera,

+                   hit,

+                   normal,

+                   m_c->object_clipper()->get_clipping_plane(),

+                   &facet))

+        {

+            // In case this hit is clipped, skip it.

+            if (is_mesh_point_clipped(hit.cast<double>(), trafo_matrices[mesh_id]))

+                continue;

+

+            // Is this hit the closest to the camera so far?

+            double hit_squared_distance = (camera.get_position()-trafo_matrices[mesh_id]*hit.cast<double>()).squaredNorm();

+            if (hit_squared_distance < closest_hit_squared_distance) {

+                closest_hit_squared_distance = hit_squared_distance;

+                closest_facet = facet;

+                closest_hit_mesh_id = mesh_id;

+                closest_hit = hit;

+            }

+        }

+    }

+

+    m_rr = {mouse_position, closest_hit_mesh_id, closest_hit, closest_facet};

+}

+

+bool GLGizmoPainterBase::on_is_activable() const

+{

+    const Selection& selection = m_parent.get_selection();

+

+    if (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() != ptFFF

+        || !selection.is_single_full_instance() || wxGetApp().get_mode() == comSimple)

+        return false;

+

+    // Check that none of the selected volumes is outside. Only SLA auxiliaries (supports) are allowed outside.

+    const Selection::IndicesList& list = selection.get_volume_idxs();

+    return std::all_of(list.cbegin(), list.cend(), [&selection](unsigned int idx) { return !selection.get_volume(idx)->is_outside; });

+}

+

+bool GLGizmoPainterBase::on_is_selectable() const

+{

+    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptFFF

+         && wxGetApp().get_mode() != comSimple );

+}

+

+

+CommonGizmosDataID GLGizmoPainterBase::on_get_requirements() const

+{

+    return CommonGizmosDataID(

+                int(CommonGizmosDataID::SelectionInfo)

+              | int(CommonGizmosDataID::InstancesHider)

+              | int(CommonGizmosDataID::Raycaster)

+              | int(CommonGizmosDataID::ObjectClipper));

+}

+

+

+void GLGizmoPainterBase::on_set_state()

+{

+    if (m_state == m_old_state)

+        return;

+

+    if (m_state == On && m_old_state != On) { // the gizmo was just turned on

+        on_opening();

+    }

+    if (m_state == Off && m_old_state != Off) { // the gizmo was just turned Off

+        // we are actually shutting down

+        on_shutdown();

+        m_old_mo_id = -1;

+        //m_iva.release_geometry();

+        m_triangle_selectors.clear();

+    }

+    m_old_state = m_state;

+}

+

+

+

+void GLGizmoPainterBase::on_load(cereal::BinaryInputArchive&)

+{

+    // We should update the gizmo from current ModelObject, but it is not

+    // possible at this point. That would require having updated selection and

+    // common gizmos data, which is not done at this point. Instead, save

+    // a flag to do the update in set_painter_gizmo_data, which will be called

+    // soon after.

+    m_schedule_update = true;

+}

+

+TriangleSelector::ClippingPlane GLGizmoPainterBase::get_clipping_plane_in_volume_coordinates(const Transform3d &trafo) const {

+    const ::Slic3r::GUI::ClippingPlane *const clipping_plane = m_c->object_clipper()->get_clipping_plane();

+    if (clipping_plane == nullptr || !clipping_plane->is_active())

+        return {};

+

+    const Vec3d  clp_normal = clipping_plane->get_normal();

+    const double clp_offset = clipping_plane->get_offset();

+

+    const Transform3d trafo_normal = Transform3d(trafo.linear().transpose());

+    const Transform3d trafo_inv    = trafo.inverse();

+

+    Vec3d point_on_plane             = clp_normal * clp_offset;

+    Vec3d point_on_plane_transformed = trafo_inv * point_on_plane;

+    Vec3d normal_transformed         = trafo_normal * clp_normal;

+    auto offset_transformed          = float(point_on_plane_transformed.dot(normal_transformed));

+

+    return TriangleSelector::ClippingPlane({float(normal_transformed.x()), float(normal_transformed.y()), float(normal_transformed.z()), offset_transformed});

+}

+

+ColorRGBA TriangleSelectorGUI::get_seed_fill_color(const ColorRGBA& base_color)

+{

+    return saturate(base_color, 0.75f);

+}

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+void TriangleSelectorGUI::render(ImGuiWrapper* imgui, const Transform3d& matrix)

+#else

+void TriangleSelectorGUI::render(ImGuiWrapper* imgui)

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+{

+    static const ColorRGBA enforcers_color = { 0.47f, 0.47f, 1.0f, 1.0f };

+    static const ColorRGBA blockers_color  = { 1.0f, 0.44f, 0.44f, 1.0f };

+

+    if (m_update_render_data) {

+        update_render_data();

+        m_update_render_data = false;

+    }

+

+    auto* shader = wxGetApp().get_current_shader();

+    if (! shader)

+        return;

+

+    assert(shader->get_name() == "gouraud");

+

+    for (auto iva : {std::make_pair(&m_iva_enforcers, enforcers_color),

+                     std::make_pair(&m_iva_blockers, blockers_color)}) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        iva.first->set_color(iva.second);

+        iva.first->render();

+#else

+        if (iva.first->has_VBOs()) {

+            shader->set_uniform("uniform_color", iva.second);

+            iva.first->render();

+        }

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    for (auto& iva : m_iva_seed_fills) {

+        size_t           color_idx = &iva - &m_iva_seed_fills.front();

+        const ColorRGBA& color     = TriangleSelectorGUI::get_seed_fill_color(color_idx == 1 ? enforcers_color :

+            color_idx == 2 ? blockers_color :

+            GLVolume::NEUTRAL_COLOR);

+        iva.set_color(color);

+        iva.render();

+    }

+#else

+    for (auto& iva : m_iva_seed_fills)

+        if (iva.has_VBOs()) {

+            size_t                      color_idx = &iva - &m_iva_seed_fills.front();

+            const ColorRGBA& color                = TriangleSelectorGUI::get_seed_fill_color(color_idx == 1 ? enforcers_color :

+                                                                                             color_idx == 2 ? blockers_color :

+                                                                                                              GLVolume::NEUTRAL_COLOR);

+            shader->set_uniform("uniform_color", color);

+            iva.render();

+        }

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    render_paint_contour(matrix);

+#else

+    render_paint_contour();

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+#else

+    if (m_paint_contour.has_VBO()) {

+        ScopeGuard guard_gouraud([shader]() { shader->start_using(); });

+        shader->stop_using();

+

+        auto *contour_shader = wxGetApp().get_shader("mm_contour");

+        contour_shader->start_using();

+        contour_shader->set_uniform("offset", OpenGLManager::get_gl_info().is_mesa() ? 0.0005 : 0.00001);

+        m_paint_contour.render();

+        contour_shader->stop_using();

+    }

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+#ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG

+    if (imgui)

+        render_debug(imgui);

+    else

+        assert(false); // If you want debug output, pass ptr to ImGuiWrapper.

+#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG

+}

+

+void TriangleSelectorGUI::update_render_data()

+{

+    int              enf_cnt = 0;

+    int              blc_cnt = 0;

+    std::vector<int> seed_fill_cnt(m_iva_seed_fills.size(), 0);

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    for (auto* iva : { &m_iva_enforcers, &m_iva_blockers }) {

+        iva->reset();

+    }

+

+    for (auto& iva : m_iva_seed_fills) {

+        iva.reset();

+    }

+

+    GLModel::Geometry iva_enforcers_data;

+    iva_enforcers_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };

+    GLModel::Geometry iva_blockers_data;

+    iva_blockers_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };

+    std::array<GLModel::Geometry, 3> iva_seed_fills_data;

+    for (auto& data : iva_seed_fills_data)

+        data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };

+#else

+    for (auto *iva : {&m_iva_enforcers, &m_iva_blockers})

+        iva->release_geometry();

+

+    for (auto &iva : m_iva_seed_fills)

+        iva.release_geometry();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    // small value used to offset triangles along their normal to avoid z-fighting

+    static const float offset = 0.001f;

+

+    for (const Triangle &tr : m_triangles) {

+        if (!tr.valid() || tr.is_split() || (tr.get_state() == EnforcerBlockerType::NONE && !tr.is_selected_by_seed_fill()))

+            continue;

+

+        int tr_state = int(tr.get_state());

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        GLModel::Geometry &iva = tr.is_selected_by_seed_fill()                   ? iva_seed_fills_data[tr_state] :

+                                 tr.get_state() == EnforcerBlockerType::ENFORCER ? iva_enforcers_data :

+                                                                                   iva_blockers_data;

+#else

+        GLIndexedVertexArray &iva = tr.is_selected_by_seed_fill()                   ? m_iva_seed_fills[tr_state] :

+                                    tr.get_state() == EnforcerBlockerType::ENFORCER ? m_iva_enforcers :

+                                                                                      m_iva_blockers;

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        int                  &cnt = tr.is_selected_by_seed_fill()                   ? seed_fill_cnt[tr_state] :

+                                    tr.get_state() == EnforcerBlockerType::ENFORCER ? enf_cnt :

+                                                                                      blc_cnt;

+        const Vec3f          &v0  = m_vertices[tr.verts_idxs[0]].v;

+        const Vec3f          &v1  = m_vertices[tr.verts_idxs[1]].v;

+        const Vec3f          &v2  = m_vertices[tr.verts_idxs[2]].v;

+        //FIXME the normal may likely be pulled from m_triangle_selectors, but it may not be worth the effort

+        // or the current implementation may be more cache friendly.

+        const Vec3f           n   = (v1 - v0).cross(v2 - v1).normalized();

+        // small value used to offset triangles along their normal to avoid z-fighting

+        const Vec3f    offset_n   = offset * n;

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        iva.add_vertex(v0 + offset_n, n);

+        iva.add_vertex(v1 + offset_n, n);

+        iva.add_vertex(v2 + offset_n, n);

+        iva.add_triangle((unsigned int)cnt, (unsigned int)cnt + 1, (unsigned int)cnt + 2);

+#else

+        iva.push_geometry(v0 + offset_n, n);

+        iva.push_geometry(v1 + offset_n, n);

+        iva.push_geometry(v2 + offset_n, n);

+        iva.push_triangle(cnt, cnt + 1, cnt + 2);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        cnt += 3;

+    }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    if (!iva_enforcers_data.is_empty())

+        m_iva_enforcers.init_from(std::move(iva_enforcers_data));

+    if (!iva_blockers_data.is_empty())

+        m_iva_blockers.init_from(std::move(iva_blockers_data));

+    for (size_t i = 0; i < m_iva_seed_fills.size(); ++i) {

+        if (!iva_seed_fills_data[i].is_empty())

+            m_iva_seed_fills[i].init_from(std::move(iva_seed_fills_data[i]));

+    }

+

+    update_paint_contour();

+#else

+    for (auto *iva : {&m_iva_enforcers, &m_iva_blockers})

+        iva->finalize_geometry(true);

+

+    for (auto &iva : m_iva_seed_fills)

+        iva.finalize_geometry(true);

+

+    m_paint_contour.release_geometry();

+    std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();

+    m_paint_contour.contour_vertices.reserve(contour_edges.size() * 6);

+    for (const Vec2i &edge : contour_edges) {

+        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(0)].v.x());

+        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(0)].v.y());

+        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(0)].v.z());

+

+        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(1)].v.x());

+        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(1)].v.y());

+        m_paint_contour.contour_vertices.emplace_back(m_vertices[edge(1)].v.z());

+    }

+

+    m_paint_contour.contour_indices.assign(m_paint_contour.contour_vertices.size() / 3, 0);

+    std::iota(m_paint_contour.contour_indices.begin(), m_paint_contour.contour_indices.end(), 0);

+    m_paint_contour.contour_indices_size = m_paint_contour.contour_indices.size();

+

+    m_paint_contour.finalize_geometry();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+}

+

+#if !ENABLE_LEGACY_OPENGL_REMOVAL

+void GLPaintContour::render() const

+{

+    assert(this->m_contour_VBO_id != 0);

+    assert(this->m_contour_EBO_id != 0);

+

+    glsafe(::glLineWidth(4.0f));

+

+    glsafe(::glBindBuffer(GL_ARRAY_BUFFER, this->m_contour_VBO_id));

+    glsafe(::glVertexPointer(3, GL_FLOAT, 3 * sizeof(float), nullptr));

+

+    glsafe(::glEnableClientState(GL_VERTEX_ARRAY));

+

+    if (this->contour_indices_size > 0) {

+        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->m_contour_EBO_id));

+        glsafe(::glDrawElements(GL_LINES, GLsizei(this->contour_indices_size), GL_UNSIGNED_INT, nullptr));

+        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));

+    }

+

+    glsafe(::glDisableClientState(GL_VERTEX_ARRAY));

+

+    glsafe(::glBindBuffer(GL_ARRAY_BUFFER, 0));

+}

+

+void GLPaintContour::finalize_geometry()

+{

+    assert(this->m_contour_VBO_id == 0);

+    assert(this->m_contour_EBO_id == 0);

+

+    if (!this->contour_vertices.empty()) {

+        glsafe(::glGenBuffers(1, &this->m_contour_VBO_id));

+        glsafe(::glBindBuffer(GL_ARRAY_BUFFER, this->m_contour_VBO_id));

+        glsafe(::glBufferData(GL_ARRAY_BUFFER, this->contour_vertices.size() * sizeof(float), this->contour_vertices.data(), GL_STATIC_DRAW));

+        glsafe(::glBindBuffer(GL_ARRAY_BUFFER, 0));

+        this->contour_vertices.clear();

+    }

+

+    if (!this->contour_indices.empty()) {

+        glsafe(::glGenBuffers(1, &this->m_contour_EBO_id));

+        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, this->m_contour_EBO_id));

+        glsafe(::glBufferData(GL_ELEMENT_ARRAY_BUFFER, this->contour_indices.size() * sizeof(unsigned int), this->contour_indices.data(), GL_STATIC_DRAW));

+        glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));

+        this->contour_indices.clear();

+    }

+}

+

+void GLPaintContour::release_geometry()

+{

+    if (this->m_contour_VBO_id) {

+        glsafe(::glDeleteBuffers(1, &this->m_contour_VBO_id));

+        this->m_contour_VBO_id = 0;

+    }

+    if (this->m_contour_EBO_id) {

+        glsafe(::glDeleteBuffers(1, &this->m_contour_EBO_id));

+        this->m_contour_EBO_id = 0;

+    }

+    this->clear();

+}

+#endif // !ENABLE_LEGACY_OPENGL_REMOVAL

+

+#ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG

+void TriangleSelectorGUI::render_debug(ImGuiWrapper* imgui)

+{

+    imgui->begin(std::string("TriangleSelector dialog (DEV ONLY)"),

+                 ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);

+    static float edge_limit = 1.f;

+    imgui->text("Edge limit (mm): ");

+    imgui->slider_float("", &edge_limit, 0.1f, 8.f);

+    set_edge_limit(edge_limit);

+    imgui->checkbox("Show split triangles: ", m_show_triangles);

+    imgui->checkbox("Show invalid triangles: ", m_show_invalid);

+

+    int valid_triangles = m_triangles.size() - m_invalid_triangles;

+    imgui->text("Valid triangles: " + std::to_string(valid_triangles) +

+                  "/" + std::to_string(m_triangles.size()));

+    imgui->text("Vertices: " + std::to_string(m_vertices.size()));

+    if (imgui->button("Force garbage collection"))

+        garbage_collect();

+

+    if (imgui->button("Serialize - deserialize")) {

+        auto map = serialize();

+        deserialize(map);

+    }

+

+    imgui->end();

+

+    if (! m_show_triangles)

+        return;

+

+    enum vtype {

+        ORIGINAL = 0,

+        SPLIT,

+        INVALID

+    };

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    for (auto& va : m_varrays)

+        va.reset();

+#else

+    for (auto& va : m_varrays)

+        va.release_geometry();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    std::array<int, 3> cnts;

+

+    ::glScalef(1.01f, 1.01f, 1.01f);

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    std::array<GLModel::Geometry, 3> varrays_data;

+    for (auto& data : varrays_data)

+        data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::UINT };

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    for (int tr_id=0; tr_id<int(m_triangles.size()); ++tr_id) {

+        const Triangle& tr = m_triangles[tr_id];

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        GLModel::Geometry* va = nullptr;

+#else

+        GLIndexedVertexArray* va = nullptr;

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        int* cnt = nullptr;

+        if (tr_id < m_orig_size_indices) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+            va = &varrays_data[ORIGINAL];

+#else

+            va = &m_varrays[ORIGINAL];

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+            cnt = &cnts[ORIGINAL];

+        }

+        else if (tr.valid()) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+            va = &varrays_data[SPLIT];

+#else

+            va = &m_varrays[SPLIT];

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+            cnt = &cnts[SPLIT];

+        }

+        else {

+            if (! m_show_invalid)

+                continue;

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+            va = &varrays_data[INVALID];

+#else

+            va = &m_varrays[INVALID];

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+            cnt = &cnts[INVALID];

+        }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        for (int i = 0; i < 3; ++i) {

+            va->add_vertex(m_vertices[tr.verts_idxs[i]].v, Vec3f(0.0f, 0.0f, 1.0f));

+        }

+        va->add_uint_triangle((unsigned int)*cnt, (unsigned int)*cnt + 1, (unsigned int)*cnt + 2);

+#else

+        for (int i = 0; i < 3; ++i)

+            va->push_geometry(double(m_vertices[tr.verts_idxs[i]].v[0]),

+                              double(m_vertices[tr.verts_idxs[i]].v[1]),

+                              double(m_vertices[tr.verts_idxs[i]].v[2]),

+                              0., 0., 1.);

+        va->push_triangle(*cnt,

+            *cnt + 1,

+            *cnt + 2);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        *cnt += 3;

+    }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    for (int i = 0; i < 3; ++i) {

+        if (!varrays_data[i].is_empty())

+            m_varrays[i].init_from(std::move(varrays_data[i]));

+    }

+#else

+//    for (auto* iva : { &m_iva_enforcers, &m_iva_blockers })

+//        iva->finalize_geometry(true);

+//

+//    for (auto& iva : m_iva_seed_fills)

+//        iva.finalize_geometry(true);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLShaderProgram* curr_shader = wxGetApp().get_current_shader();

+    if (curr_shader != nullptr)

+        curr_shader->stop_using();

+

+    GLShaderProgram* shader = wxGetApp().get_shader("flat");

+    if (shader != nullptr) {

+        shader->start_using();

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Camera& camera = wxGetApp().plater()->get_camera();

+        shader->set_uniform("view_model_matrix", camera.get_view_matrix());

+        shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    ::glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );

+    for (vtype i : {ORIGINAL, SPLIT, INVALID}) {

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        GLModel& va = m_varrays[i];

+        switch (i) {

+        case ORIGINAL: va.set_color({ 0.0f, 0.0f, 1.0f, 1.0f }); break;

+        case SPLIT:    va.set_color({ 1.0f, 0.0f, 0.0f, 1.0f }); break;

+        case INVALID:  va.set_color({ 1.0f, 1.0f, 0.0f, 1.0f }); break;

+        }

+        va.render();

+#else

+        GLIndexedVertexArray& va = m_varrays[i];

+        va.finalize_geometry(true);

+        if (va.has_VBOs()) {

+            switch (i) {

+            case ORIGINAL : ::glColor3f(0.f, 0.f, 1.f); break;

+            case SPLIT    : ::glColor3f(1.f, 0.f, 0.f); break;

+            case INVALID  : ::glColor3f(1.f, 1.f, 0.f); break;

+            }

+            va.render();

+        }

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+    }

+    ::glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        shader->stop_using();

+    }

+

+    if (curr_shader != nullptr)

+        curr_shader->start_using();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+}

+#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+void TriangleSelectorGUI::update_paint_contour()

+{

+    m_paint_contour.reset();

+

+    GLModel::Geometry init_data;

+    const std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();

+    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3 };

+    init_data.reserve_vertices(2 * contour_edges.size());

+    init_data.reserve_indices(2 * contour_edges.size());

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    init_data.color = ColorRGBA::WHITE();

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+// 

+    // vertices + indices

+    unsigned int vertices_count = 0;

+    for (const Vec2i& edge : contour_edges) {

+        init_data.add_vertex(m_vertices[edge(0)].v);

+        init_data.add_vertex(m_vertices[edge(1)].v);

+        vertices_count += 2;

+        init_data.add_line(vertices_count - 2, vertices_count - 1);

+    }

+

+    if (!init_data.is_empty())

+        m_paint_contour.init_from(std::move(init_data));

+}

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+void TriangleSelectorGUI::render_paint_contour(const Transform3d& matrix)

+#else

+void TriangleSelectorGUI::render_paint_contour()

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+{

+    auto* curr_shader = wxGetApp().get_current_shader();

+    if (curr_shader != nullptr)

+        curr_shader->stop_using();

+

+    auto* contour_shader = wxGetApp().get_shader("mm_contour");

+    if (contour_shader != nullptr) {

+        contour_shader->start_using();

+

+        contour_shader->set_uniform("offset", OpenGLManager::get_gl_info().is_mesa() ? 0.0005 : 0.00001);

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Camera& camera = wxGetApp().plater()->get_camera();

+        contour_shader->set_uniform("view_model_matrix", camera.get_view_matrix() * matrix);

+        contour_shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+        m_paint_contour.render();

+        contour_shader->stop_using();

+    }

+

+    if (curr_shader != nullptr)

+        curr_shader->start_using();

+}

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+} // namespace Slic3r::GUI

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
index c9947ee18..6579a1431 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
@@ -190,11 +190,7 @@ void GLGizmoRotate::on_render()
 

     glsafe(::glLineWidth((m_hover_id != -1) ? 2.0f : 1.5f));

 #if ENABLE_LEGACY_OPENGL_REMOVAL

-#if ENABLE_GL_SHADERS_ATTRIBUTES

-    GLShaderProgram* shader = wxGetApp().get_shader("flat_attr");

-#else

     GLShaderProgram* shader = wxGetApp().get_shader("flat");

-#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     if (shader != nullptr) {

         shader->start_using();

 

@@ -298,7 +294,12 @@ void GLGizmoRotate::init_data_from_selection(const Selection& selection)
     }

     else if (coordinates_type == ECoordinatesType::Local && selection.is_single_volume_or_modifier()) {

         const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        m_bounding_box = v.transformed_convex_hull_bounding_box(

+            v.get_instance_transformation().get_scaling_factor_matrix() * v.get_volume_transformation().get_scaling_factor_matrix());

+#else

         m_bounding_box = v.transformed_convex_hull_bounding_box(v.get_instance_transformation().get_matrix(true, true, false, true) * v.get_volume_transformation().get_matrix(true, true, false, true));

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

         m_center = v.world_matrix() * m_bounding_box.center();

     }

     else {

@@ -308,8 +309,13 @@ void GLGizmoRotate::init_data_from_selection(const Selection& selection)
             const GLVolume& v = *selection.get_volume(id);

             m_bounding_box.merge(v.transformed_convex_hull_bounding_box(v.get_volume_transformation().get_matrix()));

         }

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        m_bounding_box = m_bounding_box.transformed(selection.get_volume(*ids.begin())->get_instance_transformation().get_scaling_factor_matrix());

+        m_center = selection.get_volume(*ids.begin())->get_instance_transformation().get_matrix_no_scaling_factor() * m_bounding_box.center();

+#else

         m_bounding_box = m_bounding_box.transformed(selection.get_volume(*ids.begin())->get_instance_transformation().get_matrix(true, true, false, true));

         m_center = selection.get_volume(*ids.begin())->get_instance_transformation().get_matrix(false, false, true, false) * m_bounding_box.center();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

     }

 

     m_radius = Offset + m_bounding_box.radius();

@@ -322,11 +328,19 @@ void GLGizmoRotate::init_data_from_selection(const Selection& selection)
         m_orient_matrix = Transform3d::Identity();

     else if (coordinates_type == ECoordinatesType::Local && selection.is_single_volume_or_modifier()) {

         const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        m_orient_matrix = v.get_instance_transformation().get_rotation_matrix() * v.get_volume_transformation().get_rotation_matrix();

+#else

         m_orient_matrix = v.get_instance_transformation().get_matrix(true, false, true, true) * v.get_volume_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

     }

     else {

         const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        m_orient_matrix = v.get_instance_transformation().get_rotation_matrix();

+#else

         m_orient_matrix = v.get_instance_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

     }

 }

 #endif // ENABLE_WORLD_COORDINATE

@@ -656,11 +670,7 @@ void GLGizmoRotate::render_grabber_extension(const BoundingBoxf3& box, bool pick
     const double size = m_dragging ? double(m_grabbers.front().get_dragging_half_size(mean_size)) : double(m_grabbers.front().get_half_size(mean_size));

 

 #if ENABLE_LEGACY_OPENGL_REMOVAL

-#if ENABLE_GL_SHADERS_ATTRIBUTES

-    GLShaderProgram* shader = wxGetApp().get_shader(picking ? "flat_attr" : "gouraud_light_attr");

-#else

     GLShaderProgram* shader = wxGetApp().get_shader(picking ? "flat" : "gouraud_light");

-#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     if (shader == nullptr)

         return;

 

@@ -739,12 +749,12 @@ Transform3d GLGizmoRotate::local_transform(const Selection& selection) const
     {

     case X:

     {

-        ret = Geometry::assemble_transform(Vec3d::Zero(), Vec3d(0.0, 0.5 * PI, 0.0)) * Geometry::assemble_transform(Vec3d::Zero(), Vec3d(0.0, 0.0, -0.5 * PI));

+        ret = Geometry::assemble_transform(Vec3d::Zero(), 0.5 * PI * Vec3d::UnitY()) * Geometry::assemble_transform(Vec3d::Zero(), -0.5 * PI * Vec3d::UnitZ());

         break;

     }

     case Y:

     {

-        ret = Geometry::assemble_transform(Vec3d::Zero(), Vec3d(0.0, 0.0, -0.5 * PI)) * Geometry::assemble_transform(Vec3d::Zero(), Vec3d(0.0, -0.5 * PI, 0.0));

+        ret = Geometry::assemble_transform(Vec3d::Zero(), -0.5 * PI * Vec3d::UnitZ()) * Geometry::assemble_transform(Vec3d::Zero(), -0.5 * PI * Vec3d::UnitY());

         break;

     }

     default:

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp b/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
index 36e5b0217..05df5f193 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
@@ -219,14 +219,24 @@ void GLGizmoScale3D::on_render()
         }
 
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        m_bounding_box = m_bounding_box.transformed(selection.get_volume(*idxs.begin())->get_instance_transformation().get_scaling_factor_matrix());
+#else
         m_bounding_box = m_bounding_box.transformed(selection.get_volume(*idxs.begin())->get_instance_transformation().get_matrix(true, true, false, true));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
 #endif // ENABLE_WORLD_COORDINATE
 
         // gets transform from first selected volume
         const GLVolume& v = *selection.get_volume(*idxs.begin());
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        const Transform3d inst_trafo = v.get_instance_transformation().get_matrix_no_scaling_factor();
+        m_grabbers_transform = inst_trafo * Geometry::assemble_transform(m_bounding_box.center());
+        m_center = inst_trafo * m_bounding_box.center();
+#else
         m_grabbers_transform = v.get_instance_transformation().get_matrix(false, false, true) * Geometry::assemble_transform(m_bounding_box.center());
         m_center = selection.get_volume(*idxs.begin())->get_instance_transformation().get_matrix(false, false, true, false) * m_bounding_box.center();
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
         m_instance_center = v.get_instance_offset();
     }
     else if (selection.is_single_volume_or_modifier() && wxGetApp().obj_manipul()->is_instance_coordinates()) {
@@ -243,8 +253,14 @@ void GLGizmoScale3D::on_render()
 #endif // ENABLE_WORLD_COORDINATE
         const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        m_bounding_box.merge(v.transformed_convex_hull_bounding_box(
+            v.get_instance_transformation().get_scaling_factor_matrix() * v.get_volume_transformation().get_matrix_no_offset()));
+        Geometry::Transformation trafo(v.get_instance_transformation().get_rotation_matrix());
+#else
         m_bounding_box.merge(v.transformed_convex_hull_bounding_box(v.get_instance_transformation().get_matrix(true, true, false, true) * v.get_volume_transformation().get_matrix(true, false, false, true)));
         Geometry::Transformation trafo(v.get_instance_transformation().get_matrix(true, false, true, true));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
         trafo.set_offset(v.world_matrix().translation());
         m_grabbers_transform = trafo.get_matrix();
         m_center = v.world_matrix() * m_bounding_box.center();
@@ -252,8 +268,14 @@ void GLGizmoScale3D::on_render()
     }
     else if (selection.is_single_volume_or_modifier() && wxGetApp().obj_manipul()->is_local_coordinates()) {
         const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        m_bounding_box.merge(v.transformed_convex_hull_bounding_box(
+            v.get_instance_transformation().get_scaling_factor_matrix() * v.get_volume_transformation().get_scaling_factor_matrix()));
+        Geometry::Transformation trafo(v.get_instance_transformation().get_rotation_matrix() * v.get_volume_transformation().get_rotation_matrix());
+#else
         m_bounding_box.merge(v.transformed_convex_hull_bounding_box(v.get_instance_transformation().get_matrix(true, true, false, true) * v.get_volume_transformation().get_matrix(true, true, false, true)));
         Geometry::Transformation trafo(v.get_instance_transformation().get_matrix(true, false, true, true) * v.get_volume_transformation().get_matrix(true, false, true, true));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
         trafo.set_offset(v.world_matrix().translation());
         m_grabbers_transform = trafo.get_matrix();
         m_center = v.world_matrix() * m_bounding_box.center();
@@ -352,8 +374,15 @@ void GLGizmoScale3D::on_render()
 
     glsafe(::glLineWidth((m_hover_id != -1) ? 2.0f : 1.5f));
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_GL_SHADERS_ATTRIBUTES
+    const Transform3d base_matrix = local_transform(selection);
+    for (int i = 0; i < 10; ++i) {
+        m_grabbers[i].matrix = base_matrix;
+    }
+#else
     glsafe(::glPushMatrix());
     transform_to_local(selection);
+#endif // ENABLE_GL_SHADERS_ATTRIBUTES
 
     float grabber_mean_size = (float)((m_bounding_box.size().x() + m_bounding_box.size().y() + m_bounding_box.size().z()) / 3.0);
 #else
@@ -557,14 +586,23 @@ void GLGizmoScale3D::on_render_for_picking()
 {
     glsafe(::glDisable(GL_DEPTH_TEST));
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_GL_SHADERS_ATTRIBUTES
+    const Transform3d base_matrix = local_transform(m_parent.get_selection());
+    for (int i = 0; i < 10; ++i) {
+        m_grabbers[i].matrix = base_matrix;
+    }
+#else
     glsafe(::glPushMatrix());
     transform_to_local(m_parent.get_selection());
+#endif // ENABLE_GL_SHADERS_ATTRIBUTES
     render_grabbers_for_picking(m_bounding_box);
+#if !ENABLE_GL_SHADERS_ATTRIBUTES
     glsafe(::glPopMatrix());
+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
 #else
     render_grabbers_for_picking(m_parent.get_selection().get_bounding_box());
 #endif // ENABLE_WORLD_COORDINATE
-}
+    }
 
 #if ENABLE_LEGACY_OPENGL_REMOVAL
 void GLGizmoScale3D::render_grabbers_connection(unsigned int id_1, unsigned int id_2, const ColorRGBA& color)
@@ -773,6 +811,28 @@ double GLGizmoScale3D::calc_ratio(const UpdateData& data) const
 }
 
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_GL_SHADERS_ATTRIBUTES
+Transform3d GLGizmoScale3D::local_transform(const Selection& selection) const
+{
+    Transform3d ret = Geometry::assemble_transform(m_center);
+    if (!wxGetApp().obj_manipul()->is_world_coordinates()) {
+        const GLVolume& v = *selection.get_volume(*selection.get_volume_idxs().begin());
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+        Transform3d orient_matrix = v.get_instance_transformation().get_rotation_matrix();
+#else
+        Transform3d orient_matrix = v.get_instance_transformation().get_matrix(true, false, true, true);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+        if (selection.is_single_volume_or_modifier() && wxGetApp().obj_manipul()->is_local_coordinates())
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+            orient_matrix = orient_matrix * v.get_volume_transformation().get_rotation_matrix();
+#else
+            orient_matrix = orient_matrix * v.get_volume_transformation().get_matrix(true, false, true, true);
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
+        ret = ret * orient_matrix;
+    }
+    return ret;
+}
+#else
 void GLGizmoScale3D::transform_to_local(const Selection& selection) const
 {
     glsafe(::glTranslated(m_center.x(), m_center.y(), m_center.z()));
@@ -784,6 +844,7 @@ void GLGizmoScale3D::transform_to_local(const Selection& selection) const
         glsafe(::glMultMatrixd(orient_matrix.data()));
     }
 }
+#endif // ENABLE_GL_SHADERS_ATTRIBUTES
 #endif // ENABLE_WORLD_COORDINATE
 
 } // namespace GUI
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoScale.hpp b/src/slic3r/GUI/Gizmos/GLGizmoScale.hpp
index e279e53e2..b8001d7a9 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoScale.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoScale.hpp
@@ -107,7 +107,11 @@ private:
 
     double calc_ratio(const UpdateData& data) const;
 #if ENABLE_WORLD_COORDINATE
+#if ENABLE_GL_SHADERS_ATTRIBUTES
+    Transform3d local_transform(const Selection& selection) const;
+#else
     void transform_to_local(const Selection& selection) const;
+#endif // ENABLE_GL_SHADERS_ATTRIBUTES
 #endif // ENABLE_WORLD_COORDINATE
 };
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
index 7c61673b4..f72ce3206 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
@@ -1,1370 +1,1374 @@
-// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.
-#include "GLGizmoSlaSupports.hpp"
-#include "slic3r/GUI/GLCanvas3D.hpp"
-#include "slic3r/GUI/Camera.hpp"
-#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"
-#include "slic3r/GUI/MainFrame.hpp"
-#include "slic3r/Utils/UndoRedo.hpp"
-
-#include <GL/glew.h>
-
-#include <wx/msgdlg.h>
-#include <wx/settings.h>
-#include <wx/stattext.h>
-
-#include "slic3r/GUI/GUI_App.hpp"
-#include "slic3r/GUI/GUI.hpp"
-#include "slic3r/GUI/GUI_ObjectSettings.hpp"
-#include "slic3r/GUI/GUI_ObjectList.hpp"
-#include "slic3r/GUI/Plater.hpp"
-#include "slic3r/GUI/NotificationManager.hpp"
-#include "slic3r/GUI/MsgDialog.hpp"
-#include "libslic3r/PresetBundle.hpp"
-#include "libslic3r/SLAPrint.hpp"
-
-
-namespace Slic3r {
-namespace GUI {
-
-GLGizmoSlaSupports::GLGizmoSlaSupports(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
-    : GLGizmoBase(parent, icon_filename, sprite_id)
-{}
-
-bool GLGizmoSlaSupports::on_init()
-{
-    m_shortcut_key = WXK_CONTROL_L;
-
-    m_desc["head_diameter"]    = _L("Head diameter") + ": ";
-    m_desc["lock_supports"]    = _L("Lock supports under new islands");
-    m_desc["remove_selected"]  = _L("Remove selected points");
-    m_desc["remove_all"]       = _L("Remove all points");
-    m_desc["apply_changes"]    = _L("Apply changes");
-    m_desc["discard_changes"]  = _L("Discard changes");
-    m_desc["minimal_distance"] = _L("Minimal points distance") + ": ";
-    m_desc["points_density"]   = _L("Support points density") + ": ";
-    m_desc["auto_generate"]    = _L("Auto-generate points");
-    m_desc["manual_editing"]   = _L("Manual editing");
-    m_desc["clipping_of_view"] = _L("Clipping of view")+ ": ";
-    m_desc["reset_direction"]  = _L("Reset direction");
-        
-    m_cone.init_from(its_make_cone(1., 1., 2 * PI / 24));
-    m_cylinder.init_from(its_make_cylinder(1., 1., 2 * PI / 24.));
-    m_sphere.init_from(its_make_sphere(1., (2 * M_PI) / 24.));
-
-    return true;
-}
-
-void GLGizmoSlaSupports::data_changed()
-{
-    if (! m_c->selection_info())
-        return;
-
-    ModelObject* mo = m_c->selection_info()->model_object();
-
-    if (m_state == On && mo && mo->id() != m_old_mo_id) {
-        disable_editing_mode();
-        reload_cache();
-        m_old_mo_id = mo->id();
-        m_c->instances_hider()->show_supports(true);
-    }
-
-    // If we triggered autogeneration before, check backend and fetch results if they are there
-    if (mo) {
-        if (mo->sla_points_status == sla::PointsStatus::Generating)
-            get_data_from_backend();
-    }
-}
-
-
-
-void GLGizmoSlaSupports::on_render()
-{
-    if (!m_cone.is_initialized())
-        m_cone.init_from(its_make_cone(1.0, 1.0, double(PI) / 12.0));
-    if (!m_sphere.is_initialized())
-        m_sphere.init_from(its_make_sphere(1.0, double(PI) / 12.0));
-    if (!m_cylinder.is_initialized())
-        m_cylinder.init_from(its_make_cylinder(1.0, 1.0, double(PI) / 12.0));
-
-    ModelObject* mo = m_c->selection_info()->model_object();
-    const Selection& selection = m_parent.get_selection();
-
-    // If current m_c->m_model_object does not match selection, ask GLCanvas3D to turn us off
-    if (m_state == On
-     && (mo != selection.get_model()->objects[selection.get_object_idx()]
-      || m_c->selection_info()->get_active_instance() != selection.get_instance_idx())) {
-        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_RESETGIZMOS));
-        return;
-    }
-
-    glsafe(::glEnable(GL_BLEND));
-    glsafe(::glEnable(GL_DEPTH_TEST));
-
-    if (selection.is_from_single_instance())
-        render_points(selection, false);
-
-    m_selection_rectangle.render(m_parent);
-    m_c->object_clipper()->render_cut();
-    m_c->supports_clipper()->render_cut();
-
-    glsafe(::glDisable(GL_BLEND));
-}
-
-
-void GLGizmoSlaSupports::on_render_for_picking()
-{
-    const Selection& selection = m_parent.get_selection();
-    //glsafe(::glEnable(GL_DEPTH_TEST));
-    render_points(selection, true);
-}
-
-void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)
-{
-    const size_t cache_size = m_editing_mode ? m_editing_cache.size() : m_normal_cache.size();
-
-    const bool has_points = (cache_size != 0);
-    const bool has_holes = (! m_c->hollowed_mesh()->get_hollowed_mesh()
-                   && ! m_c->selection_info()->model_object()->sla_drain_holes.empty());
-
-    if (! has_points && ! has_holes)
-        return;
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    GLShaderProgram* shader = wxGetApp().get_shader(picking ? "flat" : "gouraud_light");
-    if (shader == nullptr)
-        return;
-
-    shader->start_using();
-    ScopeGuard guard([shader]() { shader->stop_using(); });
-#else
-    GLShaderProgram* shader = picking ? nullptr : wxGetApp().get_shader("gouraud_light");
-    if (shader != nullptr)
-        shader->start_using();
-    ScopeGuard guard([shader]() {
-        if (shader != nullptr)
-            shader->stop_using();
-    });
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    const GLVolume* vol = selection.get_volume(*selection.get_volume_idxs().begin());
-    Geometry::Transformation transformation(vol->get_instance_transformation().get_matrix() * vol->get_volume_transformation().get_matrix());
-    const Transform3d& instance_scaling_matrix_inverse = transformation.get_matrix(true, true, false, true).inverse();
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-    const Transform3d instance_matrix = Geometry::assemble_transform(m_c->selection_info()->get_sla_shift() * Vec3d::UnitZ()) * transformation.get_matrix();
-    const Camera& camera = wxGetApp().plater()->get_camera();
-    const Transform3d& view_matrix = camera.get_view_matrix();
-    const Transform3d& projection_matrix = camera.get_projection_matrix();
-
-    shader->set_uniform("projection_matrix", projection_matrix);
-#else
-    const Transform3d& instance_matrix = transformation.get_matrix();
-    const float z_shift = m_c->selection_info()->get_sla_shift();
-    glsafe(::glPushMatrix());
-    glsafe(::glTranslated(0.0, 0.0, z_shift));
-    glsafe(::glMultMatrixd(instance_matrix.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-    ColorRGBA render_color;
-    for (size_t i = 0; i < cache_size; ++i) {
-        const sla::SupportPoint& support_point = m_editing_mode ? m_editing_cache[i].support_point : m_normal_cache[i];
-        const bool point_selected = m_editing_mode ? m_editing_cache[i].selected : false;
-
-        if (is_mesh_point_clipped(support_point.pos.cast<double>()))
-            continue;
-
-        // First decide about the color of the point.
-        if (picking)
-            render_color = picking_color_component(i);
-        else {
-            if (size_t(m_hover_id) == i && m_editing_mode) // ignore hover state unless editing mode is active
-                render_color = { 0.f, 1.f, 1.f, 1.f };
-            else { // neigher hover nor picking
-                bool supports_new_island = m_lock_unique_islands && support_point.is_new_island;
-                if (m_editing_mode) {
-                    if (point_selected)
-                        render_color = { 1.f, 0.3f, 0.3f, 1.f};
-                    else
-                        if (supports_new_island)
-                            render_color = { 0.3f, 0.3f, 1.f, 1.f };
-                        else
-                            render_color = { 0.7f, 0.7f, 0.7f, 1.f };
-                }
-                else
-                    render_color = { 0.5f, 0.5f, 0.5f, 1.f };
-            }
-        }
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        m_cone.set_color(render_color);
-        m_sphere.set_color(render_color);
-        if (!picking)
-#else
-        m_cone.set_color(-1, render_color);
-        m_sphere.set_color(-1, render_color);
-        if (shader && !picking)
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-            shader->set_uniform("emission_factor", 0.5f);
-
-        // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Transform3d support_matrix = Geometry::assemble_transform(support_point.pos.cast<double>()) * instance_scaling_matrix_inverse;
-#else
-        glsafe(::glPushMatrix());
-        glsafe(::glTranslatef(support_point.pos.x(), support_point.pos.y(), support_point.pos.z()));
-        glsafe(::glMultMatrixd(instance_scaling_matrix_inverse.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-        if (vol->is_left_handed())
-            glFrontFace(GL_CW);
-
-        // Matrices set, we can render the point mark now.
-        // If in editing mode, we'll also render a cone pointing to the sphere.
-        if (m_editing_mode) {
-            // in case the normal is not yet cached, find and cache it
-            if (m_editing_cache[i].normal == Vec3f::Zero())
-                m_c->raycaster()->raycaster()->get_closest_point(m_editing_cache[i].support_point.pos, &m_editing_cache[i].normal);
-
-            Eigen::Quaterniond q;
-            q.setFromTwoVectors(Vec3d::UnitZ(), instance_scaling_matrix_inverse * m_editing_cache[i].normal.cast<double>());
-            const Eigen::AngleAxisd aa(q);
-            const double cone_radius = 0.25; // mm
-            const double cone_height = 0.75;
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-            const Transform3d view_model_matrix = view_matrix * instance_matrix * support_matrix * Transform3d(aa.toRotationMatrix()) *
-                Geometry::assemble_transform((cone_height + support_point.head_front_radius * RenderPointScale) * Vec3d::UnitZ(),
-                    Vec3d(PI, 0.0, 0.0), Vec3d(cone_radius, cone_radius, cone_height));
-
-            shader->set_uniform("view_model_matrix", view_model_matrix);
-            shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
-#else
-            glsafe(::glPushMatrix());
-            glsafe(::glRotated(aa.angle() * (180. / M_PI), aa.axis().x(), aa.axis().y(), aa.axis().z()));
-            glsafe(::glTranslatef(0.f, 0.f, cone_height + support_point.head_front_radius * RenderPointScale));
-            glsafe(::glRotated(180., 1., 0., 0.));
-            glsafe(::glScaled(cone_radius, cone_radius, cone_height));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-            m_cone.render();
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-            glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-        }
-
-        const double radius = (double)support_point.head_front_radius * RenderPointScale;
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Transform3d view_model_matrix = view_matrix * instance_matrix * support_matrix *
-            Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), radius * Vec3d::Ones());
-
-        shader->set_uniform("view_model_matrix", view_model_matrix);
-        shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
-#else
-        glsafe(::glPushMatrix());
-        glsafe(::glScaled(radius, radius, radius));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        m_sphere.render();
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-        glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-
-        if (vol->is_left_handed())
-            glFrontFace(GL_CCW);
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-        glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-    }
-
-    // Now render the drain holes:
-    if (has_holes && ! picking) {
-        render_color = { 0.7f, 0.7f, 0.7f, 0.7f };
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-        m_cylinder.set_color(render_color);
-#else
-        m_cylinder.set_color(-1, render_color);
-        if (shader != nullptr)
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-        shader->set_uniform("emission_factor", 0.5f);
-        for (const sla::DrainHole& drain_hole : m_c->selection_info()->model_object()->sla_drain_holes) {
-            if (is_mesh_point_clipped(drain_hole.pos.cast<double>()))
-                continue;
-
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-            const Transform3d hole_matrix = Geometry::assemble_transform(drain_hole.pos.cast<double>()) * instance_scaling_matrix_inverse;
-#else
-            // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.
-            glsafe(::glPushMatrix());
-            glsafe(::glTranslatef(drain_hole.pos.x(), drain_hole.pos.y(), drain_hole.pos.z()));
-            glsafe(::glMultMatrixd(instance_scaling_matrix_inverse.data()));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-            if (vol->is_left_handed())
-                glFrontFace(GL_CW);
-
-            // Matrices set, we can render the point mark now.
-            Eigen::Quaterniond q;
-            q.setFromTwoVectors(Vec3d::UnitZ(), instance_scaling_matrix_inverse * (-drain_hole.normal).cast<double>());
-            const Eigen::AngleAxisd aa(q);
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-            const Transform3d view_model_matrix = view_matrix * instance_matrix * hole_matrix * Transform3d(aa.toRotationMatrix()) *
-                Geometry::assemble_transform(-drain_hole.height * Vec3d::UnitZ(), Vec3d::Zero(), Vec3d(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));
-
-            shader->set_uniform("view_model_matrix", view_model_matrix);
-            shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
-#else
-            glsafe(::glRotated(aa.angle() * (180. / M_PI), aa.axis().x(), aa.axis().y(), aa.axis().z()));
-            glsafe(::glTranslated(0., 0., -drain_hole.height));
-            glsafe(::glScaled(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-            m_cylinder.render();
-
-            if (vol->is_left_handed())
-                glFrontFace(GL_CCW);
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-            glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-        }
-    }
-
-#if !ENABLE_GL_SHADERS_ATTRIBUTES
-    glsafe(::glPopMatrix());
-#endif // !ENABLE_GL_SHADERS_ATTRIBUTES
-}
-
-
-
-bool GLGizmoSlaSupports::is_mesh_point_clipped(const Vec3d& point) const
-{
-    if (m_c->object_clipper()->get_position() == 0.)
-        return false;
-
-    auto sel_info = m_c->selection_info();
-    int active_inst = m_c->selection_info()->get_active_instance();
-    const ModelInstance* mi = sel_info->model_object()->instances[active_inst];
-    const Transform3d& trafo = mi->get_transformation().get_matrix() * sel_info->model_object()->volumes.front()->get_matrix();
-
-    Vec3d transformed_point =  trafo * point;
-    transformed_point(2) += sel_info->get_sla_shift();
-    return m_c->object_clipper()->get_clipping_plane()->is_point_clipped(transformed_point);
-}
-
-
-
-// Unprojects the mouse position on the mesh and saves hit point and normal of the facet into pos_and_normal
-// Return false if no intersection was found, true otherwise.
-bool GLGizmoSlaSupports::unproject_on_mesh(const Vec2d& mouse_pos, std::pair<Vec3f, Vec3f>& pos_and_normal)
-{
-    if (! m_c->raycaster()->raycaster())
-        return false;
-
-    const Camera& camera = wxGetApp().plater()->get_camera();
-    const Selection& selection = m_parent.get_selection();
-    const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());
-    Geometry::Transformation trafo = volume->get_instance_transformation() * volume->get_volume_transformation();
-    trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));
-
-    double clp_dist = m_c->object_clipper()->get_position();
-    const ClippingPlane* clp = m_c->object_clipper()->get_clipping_plane();
-
-    // The raycaster query
-    Vec3f hit;
-    Vec3f normal;
-    if (m_c->raycaster()->raycaster()->unproject_on_mesh(
-            mouse_pos,
-            trafo.get_matrix(),
-            camera,
-            hit,
-            normal,
-            clp_dist != 0. ? clp : nullptr))
-    {
-        // Check whether the hit is in a hole
-        bool in_hole = false;
-        // In case the hollowed and drilled mesh is available, we can allow
-        // placing points in holes, because they should never end up
-        // on surface that's been drilled away.
-        if (! m_c->hollowed_mesh()->get_hollowed_mesh()) {
-            sla::DrainHoles drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;
-            for (const sla::DrainHole& hole : drain_holes) {
-                if (hole.is_inside(hit)) {
-                    in_hole = true;
-                    break;
-                }
-            }
-        }
-        if (! in_hole) {
-            // Return both the point and the facet normal.
-            pos_and_normal = std::make_pair(hit, normal);
-            return true;
-        }
-    }
-
-    return false;
-}
-
-// Following function is called from GLCanvas3D to inform the gizmo about a mouse/keyboard event.
-// The gizmo has an opportunity to react - if it does, it should return true so that the Canvas3D is
-// aware that the event was reacted to and stops trying to make different sense of it. If the gizmo
-// concludes that the event was not intended for it, it should return false.
-bool GLGizmoSlaSupports::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)
-{
-    ModelObject* mo = m_c->selection_info()->model_object();
-    int active_inst = m_c->selection_info()->get_active_instance();
-
-    if (m_editing_mode) {
-
-        // left down with shift - show the selection rectangle:
-        if (action == SLAGizmoEventType::LeftDown && (shift_down || alt_down || control_down)) {
-            if (m_hover_id == -1) {
-                if (shift_down || alt_down) {
-                    m_selection_rectangle.start_dragging(mouse_position, shift_down ? GLSelectionRectangle::EState::Select : GLSelectionRectangle::EState::Deselect);
-                }
-            }
-            else {
-                if (m_editing_cache[m_hover_id].selected)
-                    unselect_point(m_hover_id);
-                else {
-                    if (!alt_down)
-                        select_point(m_hover_id);
-                }
-            }
-
-            return true;
-        }
-
-        // left down without selection rectangle - place point on the mesh:
-        if (action == SLAGizmoEventType::LeftDown && !m_selection_rectangle.is_dragging() && !shift_down) {
-            // If any point is in hover state, this should initiate its move - return control back to GLCanvas:
-            if (m_hover_id != -1)
-                return false;
-
-            // If there is some selection, don't add new point and deselect everything instead.
-            if (m_selection_empty) {
-                std::pair<Vec3f, Vec3f> pos_and_normal;
-                if (unproject_on_mesh(mouse_position, pos_and_normal)) { // we got an intersection
-                    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Add support point"));
-                    m_editing_cache.emplace_back(sla::SupportPoint(pos_and_normal.first, m_new_point_head_diameter/2.f, false), false, pos_and_normal.second);
-                    m_parent.set_as_dirty();
-                    m_wait_for_up_event = true;
-                }
-                else
-                    return false;
-            }
-            else
-                select_point(NoPoints);
-
-            return true;
-        }
-
-        // left up with selection rectangle - select points inside the rectangle:
-        if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::ShiftUp || action == SLAGizmoEventType::AltUp) && m_selection_rectangle.is_dragging()) {
-            // Is this a selection or deselection rectangle?
-            GLSelectionRectangle::EState rectangle_status = m_selection_rectangle.get_state();
-
-            // First collect positions of all the points in world coordinates.
-            Geometry::Transformation trafo = mo->instances[active_inst]->get_transformation();
-            trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));
-            std::vector<Vec3d> points;
-            for (unsigned int i=0; i<m_editing_cache.size(); ++i)
-                points.push_back(trafo.get_matrix() * m_editing_cache[i].support_point.pos.cast<double>());
-
-            // Now ask the rectangle which of the points are inside.
-            std::vector<Vec3f> points_inside;
-            std::vector<unsigned int> points_idxs = m_selection_rectangle.stop_dragging(m_parent, points);
-            for (size_t idx : points_idxs)
-                points_inside.push_back(points[idx].cast<float>());
-
-            // Only select/deselect points that are actually visible. We want to check not only
-            // the point itself, but also the center of base of its cone, so the points don't hide
-            // under every miniature irregularity on the model. Remember the actual number and
-            // append the cone bases.
-            size_t orig_pts_num = points_inside.size();
-            for (size_t idx : points_idxs)
-                points_inside.emplace_back((trafo.get_matrix().cast<float>() * (m_editing_cache[idx].support_point.pos + m_editing_cache[idx].normal)).cast<float>());
-
-            for (size_t idx : m_c->raycaster()->raycaster()->get_unobscured_idxs(
-                     trafo, wxGetApp().plater()->get_camera(), points_inside,
-                     m_c->object_clipper()->get_clipping_plane()))
-            {
-                if (idx >= orig_pts_num) // this is a cone-base, get index of point it belongs to
-                    idx -= orig_pts_num;
-                if (rectangle_status == GLSelectionRectangle::EState::Deselect)
-                    unselect_point(points_idxs[idx]);
-                else
-                    select_point(points_idxs[idx]);
-            }
-            return true;
-        }
-
-        // left up with no selection rectangle
-        if (action == SLAGizmoEventType::LeftUp) {
-            if (m_wait_for_up_event) {
-                m_wait_for_up_event = false;
-                return true;
-            }
-        }
-
-        // dragging the selection rectangle:
-        if (action == SLAGizmoEventType::Dragging) {
-            if (m_wait_for_up_event)
-                return true; // point has been placed and the button not released yet
-                             // this prevents GLCanvas from starting scene rotation
-
-            if (m_selection_rectangle.is_dragging())  {
-                m_selection_rectangle.dragging(mouse_position);
-                return true;
-            }
-
-            return false;
-        }
-
-        if (action == SLAGizmoEventType::Delete) {
-            // delete key pressed
-            delete_selected_points();
-            return true;
-        }
-
-        if (action ==  SLAGizmoEventType::ApplyChanges) {
-            editing_mode_apply_changes();
-            return true;
-        }
-
-        if (action ==  SLAGizmoEventType::DiscardChanges) {
-            ask_about_changes_call_after([this](){ editing_mode_apply_changes(); },
-                                         [this](){ editing_mode_discard_changes(); });
-            return true;
-        }
-
-        if (action == SLAGizmoEventType::RightDown) {
-            if (m_hover_id != -1) {
-                select_point(NoPoints);
-                select_point(m_hover_id);
-                delete_selected_points();
-                return true;
-            }
-            return false;
-        }
-
-        if (action == SLAGizmoEventType::SelectAll) {
-            select_point(AllPoints);
-            return true;
-        }
-    }
-
-    if (!m_editing_mode) {
-        if (action == SLAGizmoEventType::AutomaticGeneration) {
-            auto_generate();
-            return true;
-        }
-
-        if (action == SLAGizmoEventType::ManualEditing) {
-            switch_to_editing_mode();
-            return true;
-        }
-    }
-
-    if (action == SLAGizmoEventType::MouseWheelUp && control_down) {
-        double pos = m_c->object_clipper()->get_position();
-        pos = std::min(1., pos + 0.01);
-        m_c->object_clipper()->set_position(pos, true);
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::MouseWheelDown && control_down) {
-        double pos = m_c->object_clipper()->get_position();
-        pos = std::max(0., pos - 0.01);
-        m_c->object_clipper()->set_position(pos, true);
-        return true;
-    }
-
-    if (action == SLAGizmoEventType::ResetClippingPlane) {
-        m_c->object_clipper()->set_position(-1., false);
-        return true;
-    }
-
-    return false;
-}
-
-void GLGizmoSlaSupports::delete_selected_points(bool force)
-{
-    if (! m_editing_mode) {
-        std::cout << "DEBUGGING: delete_selected_points called out of editing mode!" << std::endl;
-        std::abort();
-    }
-
-    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Delete support point"));
-
-    for (unsigned int idx=0; idx<m_editing_cache.size(); ++idx) {
-        if (m_editing_cache[idx].selected && (!m_editing_cache[idx].support_point.is_new_island || !m_lock_unique_islands || force)) {
-            m_editing_cache.erase(m_editing_cache.begin() + (idx--));
-        }
-    }
-
-    select_point(NoPoints);
-}
-
-std::vector<const ConfigOption*> GLGizmoSlaSupports::get_config_options(const std::vector<std::string>& keys) const
-{
-    std::vector<const ConfigOption*> out;
-    const ModelObject* mo = m_c->selection_info()->model_object();
-
-    if (! mo)
-        return out;
-
-    const DynamicPrintConfig& object_cfg = mo->config.get();
-    const DynamicPrintConfig& print_cfg = wxGetApp().preset_bundle->sla_prints.get_edited_preset().config;
-    std::unique_ptr<DynamicPrintConfig> default_cfg = nullptr;
-
-    for (const std::string& key : keys) {
-        if (object_cfg.has(key))
-            out.push_back(object_cfg.option(key));
-        else
-            if (print_cfg.has(key))
-                out.push_back(print_cfg.option(key));
-            else { // we must get it from defaults
-                if (default_cfg == nullptr)
-                    default_cfg.reset(DynamicPrintConfig::new_from_defaults_keys(keys));
-                out.push_back(default_cfg->option(key));
-            }
-    }
-
-    return out;
-}
-
-
-
-/*
-void GLGizmoSlaSupports::find_intersecting_facets(const igl::AABB<Eigen::MatrixXf, 3>* aabb, const Vec3f& normal, double offset, std::vector<unsigned int>& idxs) const
-{
-    if (aabb->is_leaf()) { // this is a facet
-        // corner.dot(normal) - offset
-        idxs.push_back(aabb->m_primitive);
-    }
-    else { // not a leaf
-    using CornerType = Eigen::AlignedBox<float, 3>::CornerType;
-        bool sign = std::signbit(offset - normal.dot(aabb->m_box.corner(CornerType(0))));
-        for (unsigned int i=1; i<8; ++i)
-            if (std::signbit(offset - normal.dot(aabb->m_box.corner(CornerType(i)))) != sign) {
-                find_intersecting_facets(aabb->m_left, normal, offset, idxs);
-                find_intersecting_facets(aabb->m_right, normal, offset, idxs);
-            }
-    }
-}
-
-
-
-void GLGizmoSlaSupports::make_line_segments() const
-{
-    TriangleMeshSlicer tms(&m_c->m_model_object->volumes.front()->mesh);
-    Vec3f normal(0.f, 1.f, 1.f);
-    double d = 0.;
-
-    std::vector<IntersectionLine> lines;
-    find_intersections(&m_AABB, normal, d, lines);
-    ExPolygons expolys;
-    tms.make_expolygons_simple(lines, &expolys);
-
-    SVG svg("slice_loops.svg", get_extents(expolys));
-    svg.draw(expolys);
-    //for (const IntersectionLine &l : lines[i])
-    //    svg.draw(l, "red", 0);
-    //svg.draw_outline(expolygons, "black", "blue", 0);
-    svg.Close();
-}
-*/
-
-
-void GLGizmoSlaSupports::on_render_input_window(float x, float y, float bottom_limit)
-{
-    static float last_y = 0.0f;
-    static float last_h = 0.0f;
-
-    ModelObject* mo = m_c->selection_info()->model_object();
-
-    if (! mo)
-        return;
-
-    bool first_run = true; // This is a hack to redraw the button when all points are removed,
-                           // so it is not delayed until the background process finishes.
-RENDER_AGAIN:
-    //m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);
-    //const ImVec2 window_size(m_imgui->scaled(18.f, 16.f));
-    //ImGui::SetNextWindowPos(ImVec2(x, y - std::max(0.f, y+window_size.y-bottom_limit) ));
-    //ImGui::SetNextWindowSize(ImVec2(window_size));
-
-    m_imgui->begin(get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);
-
-    // adjust window position to avoid overlap the view toolbar
-    float win_h = ImGui::GetWindowHeight();
-    y = std::min(y, bottom_limit - win_h);
-    ImGui::SetWindowPos(ImVec2(x, y), ImGuiCond_Always);
-    if ((last_h != win_h) || (last_y != y))
-    {
-        // ask canvas for another frame to render the window in the correct position
-        m_imgui->set_requires_extra_frame();
-        if (last_h != win_h)
-            last_h = win_h;
-        if (last_y != y)
-            last_y = y;
-    }
-
-    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:
-
-    const float settings_sliders_left = std::max(m_imgui->calc_text_size(m_desc.at("minimal_distance")).x, m_imgui->calc_text_size(m_desc.at("points_density")).x) + m_imgui->scaled(1.f);
-    const float clipping_slider_left = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x, m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(1.5f);
-    const float diameter_slider_left = m_imgui->calc_text_size(m_desc.at("head_diameter")).x + m_imgui->scaled(1.f);
-    const float minimal_slider_width = m_imgui->scaled(4.f);
-    const float buttons_width_approx = m_imgui->calc_text_size(m_desc.at("apply_changes")).x + m_imgui->calc_text_size(m_desc.at("discard_changes")).x + m_imgui->scaled(1.5f);
-    const float lock_supports_width_approx = m_imgui->calc_text_size(m_desc.at("lock_supports")).x + m_imgui->scaled(2.f);
-
-    float window_width = minimal_slider_width + std::max(std::max(settings_sliders_left, clipping_slider_left), diameter_slider_left);
-    window_width = std::max(std::max(window_width, buttons_width_approx), lock_supports_width_approx);
-
-    bool force_refresh = false;
-    bool remove_selected = false;
-    bool remove_all = false;
-
-    if (m_editing_mode) {
-
-        float diameter_upper_cap = static_cast<ConfigOptionFloat*>(wxGetApp().preset_bundle->sla_prints.get_edited_preset().config.option("support_pillar_diameter"))->value;
-        if (m_new_point_head_diameter > diameter_upper_cap)
-            m_new_point_head_diameter = diameter_upper_cap;
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("head_diameter"));
-        ImGui::SameLine(diameter_slider_left);
-        ImGui::PushItemWidth(window_width - diameter_slider_left);
-
-        // Following is a nasty way to:
-        //  - save the initial value of the slider before one starts messing with it
-        //  - keep updating the head radius during sliding so it is continuosly refreshed in 3D scene
-        //  - take correct undo/redo snapshot after the user is done with moving the slider
-        float initial_value = m_new_point_head_diameter;
-        m_imgui->slider_float("##head_diameter", &m_new_point_head_diameter, 0.1f, diameter_upper_cap, "%.1f");
-        if (m_imgui->get_last_slider_status().clicked) {
-            if (m_old_point_head_diameter == 0.f)
-                m_old_point_head_diameter = initial_value;
-        }
-        if (m_imgui->get_last_slider_status().edited) {
-            for (auto& cache_entry : m_editing_cache)
-                if (cache_entry.selected)
-                    cache_entry.support_point.head_front_radius = m_new_point_head_diameter / 2.f;
-        }
-        if (m_imgui->get_last_slider_status().deactivated_after_edit) {
-            // momentarily restore the old value to take snapshot
-            for (auto& cache_entry : m_editing_cache)
-                if (cache_entry.selected)
-                    cache_entry.support_point.head_front_radius = m_old_point_head_diameter / 2.f;
-            float backup = m_new_point_head_diameter;
-            m_new_point_head_diameter = m_old_point_head_diameter;
-            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Change point head diameter"));
-            m_new_point_head_diameter = backup;
-            for (auto& cache_entry : m_editing_cache)
-                if (cache_entry.selected)
-                    cache_entry.support_point.head_front_radius = m_new_point_head_diameter / 2.f;
-            m_old_point_head_diameter = 0.f;
-        }
-
-        bool changed = m_lock_unique_islands;
-        m_imgui->checkbox(m_desc.at("lock_supports"), m_lock_unique_islands);
-        force_refresh |= changed != m_lock_unique_islands;
-
-        m_imgui->disabled_begin(m_selection_empty);
-        remove_selected = m_imgui->button(m_desc.at("remove_selected"));
-        m_imgui->disabled_end();
-
-        m_imgui->disabled_begin(m_editing_cache.empty());
-        remove_all = m_imgui->button(m_desc.at("remove_all"));
-        m_imgui->disabled_end();
-
-        m_imgui->text(" "); // vertical gap
-
-        if (m_imgui->button(m_desc.at("apply_changes"))) {
-            editing_mode_apply_changes();
-            force_refresh = true;
-        }
-        ImGui::SameLine();
-        bool discard_changes = m_imgui->button(m_desc.at("discard_changes"));
-        if (discard_changes) {
-            editing_mode_discard_changes();
-            force_refresh = true;
-        }
-    }
-    else { // not in editing mode:
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("minimal_distance"));
-        ImGui::SameLine(settings_sliders_left);
-        ImGui::PushItemWidth(window_width - settings_sliders_left);
-
-        std::vector<const ConfigOption*> opts = get_config_options({"support_points_density_relative", "support_points_minimal_distance"});
-        float density = static_cast<const ConfigOptionInt*>(opts[0])->value;
-        float minimal_point_distance = static_cast<const ConfigOptionFloat*>(opts[1])->value;
-
-        m_imgui->slider_float("##minimal_point_distance", &minimal_point_distance, 0.f, 20.f, "%.f mm");
-        bool slider_clicked = m_imgui->get_last_slider_status().clicked; // someone clicked the slider
-        bool slider_edited = m_imgui->get_last_slider_status().edited; // someone is dragging the slider
-        bool slider_released = m_imgui->get_last_slider_status().deactivated_after_edit; // someone has just released the slider
-
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("points_density"));
-        ImGui::SameLine(settings_sliders_left);
-
-        m_imgui->slider_float("##points_density", &density, 0.f, 200.f, "%.f %%");
-        slider_clicked |= m_imgui->get_last_slider_status().clicked;
-        slider_edited |= m_imgui->get_last_slider_status().edited;
-        slider_released |= m_imgui->get_last_slider_status().deactivated_after_edit;
-
-        if (slider_clicked) { // stash the values of the settings so we know what to revert to after undo
-            m_minimal_point_distance_stash = minimal_point_distance;
-            m_density_stash = density;
-        }
-        if (slider_edited) {
-            mo->config.set("support_points_minimal_distance", minimal_point_distance);
-            mo->config.set("support_points_density_relative", (int)density);
-        }
-        if (slider_released) {
-            mo->config.set("support_points_minimal_distance", m_minimal_point_distance_stash);
-            mo->config.set("support_points_density_relative", (int)m_density_stash);
-            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Support parameter change"));
-            mo->config.set("support_points_minimal_distance", minimal_point_distance);
-            mo->config.set("support_points_density_relative", (int)density);
-            wxGetApp().obj_list()->update_and_show_object_settings_item();
-        }
-
-        bool generate = m_imgui->button(m_desc.at("auto_generate"));
-
-        if (generate)
-            auto_generate();
-
-        ImGui::Separator();
-        if (m_imgui->button(m_desc.at("manual_editing")))
-            switch_to_editing_mode();
-
-        m_imgui->disabled_begin(m_normal_cache.empty());
-        remove_all = m_imgui->button(m_desc.at("remove_all"));
-        m_imgui->disabled_end();
-
-        // m_imgui->text("");
-        // m_imgui->text(m_c->m_model_object->sla_points_status == sla::PointsStatus::NoPoints ? _(L("No points  (will be autogenerated)")) :
-        //              (m_c->m_model_object->sla_points_status == sla::PointsStatus::AutoGenerated ? _(L("Autogenerated points (no modifications)")) :
-        //              (m_c->m_model_object->sla_points_status == sla::PointsStatus::UserModified ? _(L("User-modified points")) :
-        //              (m_c->m_model_object->sla_points_status == sla::PointsStatus::Generating ? _(L("Generation in progress...")) : "UNKNOWN STATUS"))));
-    }
-
-
-    // Following is rendered in both editing and non-editing mode:
-    ImGui::Separator();
-    if (m_c->object_clipper()->get_position() == 0.f) {
-        ImGui::AlignTextToFramePadding();
-        m_imgui->text(m_desc.at("clipping_of_view"));
-    }
-    else {
-        if (m_imgui->button(m_desc.at("reset_direction"))) {
-            wxGetApp().CallAfter([this](){
-                    m_c->object_clipper()->set_position(-1., false);
-                });
-        }
-    }
-
-    ImGui::SameLine(clipping_slider_left);
-    ImGui::PushItemWidth(window_width - clipping_slider_left);
-    float clp_dist = m_c->object_clipper()->get_position();
-    if (m_imgui->slider_float("##clp_dist", &clp_dist, 0.f, 1.f, "%.2f"))
-        m_c->object_clipper()->set_position(clp_dist, true);
-
-
-    if (m_imgui->button("?")) {
-        wxGetApp().CallAfter([]() {
-            SlaGizmoHelpDialog help_dlg;
-            help_dlg.ShowModal();
-        });
-    }
-
-    m_imgui->end();
-
-    if (remove_selected || remove_all) {
-        force_refresh = false;
-        m_parent.set_as_dirty();
-        bool was_in_editing = m_editing_mode;
-        if (! was_in_editing)
-            switch_to_editing_mode();
-        if (remove_all) {
-            select_point(AllPoints);
-            delete_selected_points(true); // true - delete regardless of locked status
-        }
-        if (remove_selected)
-            delete_selected_points(false); // leave locked points
-        if (! was_in_editing)
-            editing_mode_apply_changes();
-
-        if (first_run) {
-            first_run = false;
-            goto RENDER_AGAIN;
-        }
-    }
-
-    if (force_refresh)
-        m_parent.set_as_dirty();
-}
-
-bool GLGizmoSlaSupports::on_is_activable() const
-{
-    const Selection& selection = m_parent.get_selection();
-
-    if (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() != ptSLA
-        || !selection.is_from_single_instance())
-        return false;
-
-    // Check that none of the selected volumes is outside. Only SLA auxiliaries (supports) are allowed outside.
-    const Selection::IndicesList& list = selection.get_volume_idxs();
-    for (const auto& idx : list)
-        if (selection.get_volume(idx)->is_outside && selection.get_volume(idx)->composite_id.volume_id >= 0)
-            return false;
-
-    return true;
-}
-
-bool GLGizmoSlaSupports::on_is_selectable() const
-{
-    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptSLA);
-}
-
-std::string GLGizmoSlaSupports::on_get_name() const
-{
-    return _u8L("SLA Support Points");
-}
-
-CommonGizmosDataID GLGizmoSlaSupports::on_get_requirements() const
-{
-    return CommonGizmosDataID(
-                int(CommonGizmosDataID::SelectionInfo)
-              | int(CommonGizmosDataID::InstancesHider)
-              | int(CommonGizmosDataID::Raycaster)
-              | int(CommonGizmosDataID::HollowedMesh)
-              | int(CommonGizmosDataID::ObjectClipper)
-              | int(CommonGizmosDataID::SupportsClipper));
-}
-
-
-
-void GLGizmoSlaSupports::ask_about_changes_call_after(std::function<void()> on_yes, std::function<void()> on_no)
-{
-    wxGetApp().CallAfter([on_yes, on_no]() {
-        // Following is called through CallAfter, because otherwise there was a problem
-        // on OSX with the wxMessageDialog being shown several times when clicked into.
-        MessageDialog dlg(GUI::wxGetApp().mainframe, _L("Do you want to save your manually "
-            "edited support points?") + "\n",_L("Save support points?"), wxICON_QUESTION | wxYES | wxNO | wxCANCEL );
-        int ret = dlg.ShowModal();
-            if (ret == wxID_YES)
-                on_yes();
-            else if (ret == wxID_NO)
-                on_no();
-    });
-}
-
-
-void GLGizmoSlaSupports::on_set_state()
-{
-    if (m_state == m_old_state)
-        return;
-
-    if (m_state == On && m_old_state != On) { // the gizmo was just turned on
-        // Set default head diameter from config.
-        const DynamicPrintConfig& cfg = wxGetApp().preset_bundle->sla_prints.get_edited_preset().config;
-        m_new_point_head_diameter = static_cast<const ConfigOptionFloat*>(cfg.option("support_head_front_diameter"))->value;
-    }
-    if (m_state == Off && m_old_state != Off) { // the gizmo was just turned Off
-        bool will_ask = m_editing_mode && unsaved_changes() && on_is_activable();
-        if (will_ask) {
-            ask_about_changes_call_after([this](){ editing_mode_apply_changes(); },
-                                         [this](){ editing_mode_discard_changes(); });
-            // refuse to be turned off so the gizmo is active when the CallAfter is executed
-            m_state = m_old_state;
-        }
-        else {
-            // we are actually shutting down
-            disable_editing_mode(); // so it is not active next time the gizmo opens
-            m_old_mo_id = -1;
-        }
-    }
-    m_old_state = m_state;
-}
-
-
-
-void GLGizmoSlaSupports::on_start_dragging()
-{
-    if (m_hover_id != -1) {
-        select_point(NoPoints);
-        select_point(m_hover_id);
-        m_point_before_drag = m_editing_cache[m_hover_id];
-    }
-    else
-        m_point_before_drag = CacheEntry();
-}
-
-
-void GLGizmoSlaSupports::on_stop_dragging()
-{
-    if (m_hover_id != -1) {
-        CacheEntry backup = m_editing_cache[m_hover_id];
-
-        if (m_point_before_drag.support_point.pos != Vec3f::Zero() // some point was touched
-         && backup.support_point.pos != m_point_before_drag.support_point.pos) // and it was moved, not just selected
-        {
-            m_editing_cache[m_hover_id] = m_point_before_drag;
-            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Move support point"));
-            m_editing_cache[m_hover_id] = backup;
-        }
-    }
-    m_point_before_drag = CacheEntry();
-}
-
-void GLGizmoSlaSupports::on_dragging(const UpdateData &data)
-{
-    assert(m_hover_id != -1);
-    if (!m_editing_mode) return;
-    if (m_editing_cache[m_hover_id].support_point.is_new_island && m_lock_unique_islands)
-        return;
-    
-    std::pair<Vec3f, Vec3f> pos_and_normal;
-    if (!unproject_on_mesh(data.mouse_pos.cast<double>(), pos_and_normal))
-        return;
-
-    m_editing_cache[m_hover_id].support_point.pos = pos_and_normal.first;
-    m_editing_cache[m_hover_id].support_point.is_new_island = false;
-    m_editing_cache[m_hover_id].normal = pos_and_normal.second;        
-}
-
-void GLGizmoSlaSupports::on_load(cereal::BinaryInputArchive& ar)
-{
-    ar(m_new_point_head_diameter,
-       m_normal_cache,
-       m_editing_cache,
-       m_selection_empty
-    );
-}
-
-
-
-void GLGizmoSlaSupports::on_save(cereal::BinaryOutputArchive& ar) const
-{
-    ar(m_new_point_head_diameter,
-       m_normal_cache,
-       m_editing_cache,
-       m_selection_empty
-    );
-}
-
-
-
-void GLGizmoSlaSupports::select_point(int i)
-{
-    if (! m_editing_mode) {
-        std::cout << "DEBUGGING: select_point called when out of editing mode!" << std::endl;
-        std::abort();
-    }
-
-    if (i == AllPoints || i == NoPoints) {
-        for (auto& point_and_selection : m_editing_cache)
-            point_and_selection.selected = ( i == AllPoints );
-        m_selection_empty = (i == NoPoints);
-
-        if (i == AllPoints)
-            m_new_point_head_diameter = m_editing_cache[0].support_point.head_front_radius * 2.f;
-    }
-    else {
-        m_editing_cache[i].selected = true;
-        m_selection_empty = false;
-        m_new_point_head_diameter = m_editing_cache[i].support_point.head_front_radius * 2.f;
-    }
-}
-
-
-void GLGizmoSlaSupports::unselect_point(int i)
-{
-    if (! m_editing_mode) {
-        std::cout << "DEBUGGING: unselect_point called when out of editing mode!" << std::endl;
-        std::abort();
-    }
-
-    m_editing_cache[i].selected = false;
-    m_selection_empty = true;
-    for (const CacheEntry& ce : m_editing_cache) {
-        if (ce.selected) {
-            m_selection_empty = false;
-            break;
-        }
-    }
-}
-
-
-
-
-void GLGizmoSlaSupports::editing_mode_discard_changes()
-{
-    if (! m_editing_mode) {
-        std::cout << "DEBUGGING: editing_mode_discard_changes called when out of editing mode!" << std::endl;
-        std::abort();
-    }
-    select_point(NoPoints);
-    disable_editing_mode();
-}
-
-
-
-void GLGizmoSlaSupports::editing_mode_apply_changes()
-{
-    // If there are no changes, don't touch the front-end. The data in the cache could have been
-    // taken from the backend and copying them to ModelObject would needlessly invalidate them.
-    disable_editing_mode(); // this leaves the editing mode undo/redo stack and must be done before the snapshot is taken
-
-    if (unsaved_changes()) {
-        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Support points edit"));
-
-        m_normal_cache.clear();
-        for (const CacheEntry& ce : m_editing_cache)
-            m_normal_cache.push_back(ce.support_point);
-
-        ModelObject* mo = m_c->selection_info()->model_object();
-        mo->sla_points_status = sla::PointsStatus::UserModified;
-        mo->sla_support_points.clear();
-        mo->sla_support_points = m_normal_cache;
-
-        reslice_SLA_supports();
-    }
-}
-
-
-
-void GLGizmoSlaSupports::reload_cache()
-{
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    m_normal_cache.clear();
-    if (mo->sla_points_status == sla::PointsStatus::AutoGenerated || mo->sla_points_status == sla::PointsStatus::Generating)
-        get_data_from_backend();
-    else
-        for (const sla::SupportPoint& point : mo->sla_support_points)
-            m_normal_cache.emplace_back(point);
-}
-
-
-bool GLGizmoSlaSupports::has_backend_supports() const
-{
-    const ModelObject* mo = m_c->selection_info()->model_object();
-    if (! mo)
-        return false;
-
-    // find SlaPrintObject with this ID
-    for (const SLAPrintObject* po : m_parent.sla_print()->objects()) {
-        if (po->model_object()->id() == mo->id())
-        	return po->is_step_done(slaposSupportPoints);
-    }
-    return false;
-}
-
-void GLGizmoSlaSupports::reslice_SLA_supports(bool postpone_error_messages) const
-{
-    wxGetApp().CallAfter([this, postpone_error_messages]() {
-        wxGetApp().plater()->reslice_SLA_supports(
-            *m_c->selection_info()->model_object(), postpone_error_messages);
-    });
-}
-
-bool GLGizmoSlaSupports::on_mouse(const wxMouseEvent &mouse_event){
-    if (mouse_event.Moving()) return false;
-    if (use_grabbers(mouse_event)) return true;
-
-    // wxCoord == int --> wx/types.h
-    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());
-    Vec2d mouse_pos = mouse_coord.cast<double>();
-
-    static bool pending_right_up = false;        
-    if (mouse_event.LeftDown()) {
-        bool grabber_contains_mouse = (get_hover_id() != -1);
-        bool control_down = mouse_event.CmdDown();
-        if ((!control_down || grabber_contains_mouse) &&
-            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))
-        return true;
-    } else if (mouse_event.Dragging()) {
-        bool control_down = mouse_event.CmdDown();
-        if (m_parent.get_move_volume_id() != -1) {
-            // don't allow dragging objects with the Sla gizmo on
-            return true;
-        } else if (!control_down &&
-                gizmo_event(SLAGizmoEventType::Dragging, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false)) {
-            // the gizmo got the event and took some action, no need to do
-            // anything more here
-            m_parent.set_as_dirty();
-            return true;
-        } else if (control_down && (mouse_event.LeftIsDown() || mouse_event.RightIsDown())){
-            // CTRL has been pressed while already dragging -> stop current action
-            if (mouse_event.LeftIsDown())
-                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);
-            else if (mouse_event.RightIsDown())
-                pending_right_up = false;
-        }
-    } else if (mouse_event.LeftUp() && !m_parent.is_mouse_dragging()) {
-        // in case SLA/FDM gizmo is selected, we just pass the LeftUp event
-        // and stop processing - neither object moving or selecting is
-        // suppressed in that case
-        gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());
-        return true;
-    }else if (mouse_event.RightDown()){
-        if (m_parent.get_selection().get_object_idx() != -1 &&
-            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) {
-            // we need to set the following right up as processed to avoid showing
-            // the context menu if the user release the mouse over the object
-            pending_right_up = true;
-            // event was taken care of by the SlaSupports gizmo
-            return true;
-        }
-    } else if (pending_right_up && mouse_event.RightUp()) {
-        pending_right_up = false;
-        return true;
-    }
-    return false;
-}
-
-void GLGizmoSlaSupports::get_data_from_backend()
-{
-    if (! has_backend_supports())
-        return;
-    ModelObject* mo = m_c->selection_info()->model_object();
-
-    // find the respective SLAPrintObject, we need a pointer to it
-    for (const SLAPrintObject* po : m_parent.sla_print()->objects()) {
-        if (po->model_object()->id() == mo->id()) {
-            m_normal_cache.clear();
-            const std::vector<sla::SupportPoint>& points = po->get_support_points();
-            auto mat = (po->trafo() * po->model_object()->volumes.front()->get_transformation().get_matrix()).inverse().cast<float>();
-            for (unsigned int i=0; i<points.size();++i)
-                m_normal_cache.emplace_back(sla::SupportPoint(mat * points[i].pos, points[i].head_front_radius, points[i].is_new_island));
-
-            mo->sla_points_status = sla::PointsStatus::AutoGenerated;
-            break;
-        }
-    }
-
-    // We don't copy the data into ModelObject, as this would stop the background processing.
-}
-
-
-
-void GLGizmoSlaSupports::auto_generate()
-{
-    //wxMessageDialog dlg(GUI::wxGetApp().plater(), 
-    MessageDialog dlg(GUI::wxGetApp().plater(), 
-                        _L("Autogeneration will erase all manually edited points.") + "\n\n" +
-                        _L("Are you sure you want to do it?") + "\n",
-                        _L("Warning"), wxICON_WARNING | wxYES | wxNO);
-
-    ModelObject* mo = m_c->selection_info()->model_object();
-
-    if (mo->sla_points_status != sla::PointsStatus::UserModified || m_normal_cache.empty() || dlg.ShowModal() == wxID_YES) {
-        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Autogenerate support points"));
-        wxGetApp().CallAfter([this]() { reslice_SLA_supports(); });
-        mo->sla_points_status = sla::PointsStatus::Generating;
-    }
-}
-
-
-
-void GLGizmoSlaSupports::switch_to_editing_mode()
-{
-    wxGetApp().plater()->enter_gizmos_stack();
-    m_editing_mode = true;
-    m_editing_cache.clear();
-    for (const sla::SupportPoint& sp : m_normal_cache)
-        m_editing_cache.emplace_back(sp);
-    select_point(NoPoints);
-
-    m_c->instances_hider()->show_supports(false);
-    m_parent.set_as_dirty();
-}
-
-
-void GLGizmoSlaSupports::disable_editing_mode()
-{
-    if (m_editing_mode) {
-        m_editing_mode = false;
-        wxGetApp().plater()->leave_gizmos_stack();
-        m_c->instances_hider()->show_supports(true);
-        m_parent.set_as_dirty();
-    }
-    wxGetApp().plater()->get_notification_manager()->close_notification_of_type(NotificationType::QuitSLAManualMode);
-}
-
-
-
-bool GLGizmoSlaSupports::unsaved_changes() const
-{
-    if (m_editing_cache.size() != m_normal_cache.size())
-        return true;
-
-    for (size_t i=0; i<m_editing_cache.size(); ++i)
-        if (m_editing_cache[i].support_point != m_normal_cache[i])
-            return true;
-
-    return false;
-}
-
-SlaGizmoHelpDialog::SlaGizmoHelpDialog()
-: wxDialog(nullptr, wxID_ANY, _L("SLA gizmo keyboard shortcuts"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE|wxRESIZE_BORDER)
-{
-    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
-    const wxString ctrl = GUI::shortkey_ctrl_prefix();
-    const wxString alt  = GUI::shortkey_alt_prefix();
-
-
-    // fonts
-    const wxFont& font = wxGetApp().small_font();
-    const wxFont& bold_font = wxGetApp().bold_font();
-
-    auto note_text = new wxStaticText(this, wxID_ANY, _L("Note: some shortcuts work in (non)editing mode only."));
-    note_text->SetFont(font);
-
-    auto vsizer    = new wxBoxSizer(wxVERTICAL);
-    auto gridsizer = new wxFlexGridSizer(2, 5, 15);
-    auto hsizer    = new wxBoxSizer(wxHORIZONTAL);
-
-    hsizer->AddSpacer(20);
-    hsizer->Add(vsizer);
-    hsizer->AddSpacer(20);
-
-    vsizer->AddSpacer(20);
-    vsizer->Add(note_text, 1, wxALIGN_CENTRE_HORIZONTAL);
-    vsizer->AddSpacer(20);
-    vsizer->Add(gridsizer);
-    vsizer->AddSpacer(20);
-
-    std::vector<std::pair<wxString, wxString>> shortcuts;
-    shortcuts.push_back(std::make_pair(_L("Left click"),              _L("Add point")));
-    shortcuts.push_back(std::make_pair(_L("Right click"),             _L("Remove point")));
-    shortcuts.push_back(std::make_pair(_L("Drag"),                    _L("Move point")));
-    shortcuts.push_back(std::make_pair(ctrl+_L("Left click"),         _L("Add point to selection")));
-    shortcuts.push_back(std::make_pair(alt+_L("Left click"),          _L("Remove point from selection")));
-    shortcuts.push_back(std::make_pair(wxString("Shift+")+_L("Drag"), _L("Select by rectangle")));
-    shortcuts.push_back(std::make_pair(alt+_(L("Drag")),              _L("Deselect by rectangle")));
-    shortcuts.push_back(std::make_pair(ctrl+"A",                      _L("Select all points")));
-    shortcuts.push_back(std::make_pair("Delete",                      _L("Remove selected points")));
-    shortcuts.push_back(std::make_pair(ctrl+_L("Mouse wheel"),        _L("Move clipping plane")));
-    shortcuts.push_back(std::make_pair("R",                           _L("Reset clipping plane")));
-    shortcuts.push_back(std::make_pair("Enter",                       _L("Apply changes")));
-    shortcuts.push_back(std::make_pair("Esc",                         _L("Discard changes")));
-    shortcuts.push_back(std::make_pair("M",                           _L("Switch to editing mode")));
-    shortcuts.push_back(std::make_pair("A",                           _L("Auto-generate points")));
-
-    for (const auto& pair : shortcuts) {
-        auto shortcut = new wxStaticText(this, wxID_ANY, pair.first);
-        auto desc = new wxStaticText(this, wxID_ANY, pair.second);
-        shortcut->SetFont(bold_font);
-        desc->SetFont(font);
-        gridsizer->Add(shortcut, -1, wxALIGN_CENTRE_VERTICAL);
-        gridsizer->Add(desc, -1, wxALIGN_CENTRE_VERTICAL);
-    }
-
-    SetSizer(hsizer);
-    hsizer->SetSizeHints(this);
-}
-
-
-
-} // namespace GUI
-} // namespace Slic3r
+// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.

+#include "GLGizmoSlaSupports.hpp"

+#include "slic3r/GUI/GLCanvas3D.hpp"

+#include "slic3r/GUI/Camera.hpp"

+#include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"

+#include "slic3r/GUI/MainFrame.hpp"

+#include "slic3r/Utils/UndoRedo.hpp"

+

+#include <GL/glew.h>

+

+#include <wx/msgdlg.h>

+#include <wx/settings.h>

+#include <wx/stattext.h>

+

+#include "slic3r/GUI/GUI_App.hpp"

+#include "slic3r/GUI/GUI.hpp"

+#include "slic3r/GUI/GUI_ObjectSettings.hpp"

+#include "slic3r/GUI/GUI_ObjectList.hpp"

+#include "slic3r/GUI/Plater.hpp"

+#include "slic3r/GUI/NotificationManager.hpp"

+#include "slic3r/GUI/MsgDialog.hpp"

+#include "libslic3r/PresetBundle.hpp"

+#include "libslic3r/SLAPrint.hpp"

+

+

+namespace Slic3r {

+namespace GUI {

+

+GLGizmoSlaSupports::GLGizmoSlaSupports(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)

+    : GLGizmoBase(parent, icon_filename, sprite_id)

+{}

+

+bool GLGizmoSlaSupports::on_init()

+{

+    m_shortcut_key = WXK_CONTROL_L;

+

+    m_desc["head_diameter"]    = _L("Head diameter") + ": ";

+    m_desc["lock_supports"]    = _L("Lock supports under new islands");

+    m_desc["remove_selected"]  = _L("Remove selected points");

+    m_desc["remove_all"]       = _L("Remove all points");

+    m_desc["apply_changes"]    = _L("Apply changes");

+    m_desc["discard_changes"]  = _L("Discard changes");

+    m_desc["minimal_distance"] = _L("Minimal points distance") + ": ";

+    m_desc["points_density"]   = _L("Support points density") + ": ";

+    m_desc["auto_generate"]    = _L("Auto-generate points");

+    m_desc["manual_editing"]   = _L("Manual editing");

+    m_desc["clipping_of_view"] = _L("Clipping of view")+ ": ";

+    m_desc["reset_direction"]  = _L("Reset direction");

+        

+    m_cone.init_from(its_make_cone(1., 1., 2 * PI / 24));

+    m_cylinder.init_from(its_make_cylinder(1., 1., 2 * PI / 24.));

+    m_sphere.init_from(its_make_sphere(1., (2 * M_PI) / 24.));

+

+    return true;

+}

+

+void GLGizmoSlaSupports::data_changed()

+{

+    if (! m_c->selection_info())

+        return;

+

+    ModelObject* mo = m_c->selection_info()->model_object();

+

+    if (m_state == On && mo && mo->id() != m_old_mo_id) {

+        disable_editing_mode();

+        reload_cache();

+        m_old_mo_id = mo->id();

+        m_c->instances_hider()->show_supports(true);

+    }

+

+    // If we triggered autogeneration before, check backend and fetch results if they are there

+    if (mo) {

+        if (mo->sla_points_status == sla::PointsStatus::Generating)

+            get_data_from_backend();

+    }

+}

+

+

+

+void GLGizmoSlaSupports::on_render()

+{

+    if (!m_cone.is_initialized())

+        m_cone.init_from(its_make_cone(1.0, 1.0, double(PI) / 12.0));

+    if (!m_sphere.is_initialized())

+        m_sphere.init_from(its_make_sphere(1.0, double(PI) / 12.0));

+    if (!m_cylinder.is_initialized())

+        m_cylinder.init_from(its_make_cylinder(1.0, 1.0, double(PI) / 12.0));

+

+    ModelObject* mo = m_c->selection_info()->model_object();

+    const Selection& selection = m_parent.get_selection();

+

+    // If current m_c->m_model_object does not match selection, ask GLCanvas3D to turn us off

+    if (m_state == On

+     && (mo != selection.get_model()->objects[selection.get_object_idx()]

+      || m_c->selection_info()->get_active_instance() != selection.get_instance_idx())) {

+        m_parent.post_event(SimpleEvent(EVT_GLCANVAS_RESETGIZMOS));

+        return;

+    }

+

+    glsafe(::glEnable(GL_BLEND));

+    glsafe(::glEnable(GL_DEPTH_TEST));

+

+    if (selection.is_from_single_instance())

+        render_points(selection, false);

+

+    m_selection_rectangle.render(m_parent);

+    m_c->object_clipper()->render_cut();

+    m_c->supports_clipper()->render_cut();

+

+    glsafe(::glDisable(GL_BLEND));

+}

+

+

+void GLGizmoSlaSupports::on_render_for_picking()

+{

+    const Selection& selection = m_parent.get_selection();

+    //glsafe(::glEnable(GL_DEPTH_TEST));

+    render_points(selection, true);

+}

+

+void GLGizmoSlaSupports::render_points(const Selection& selection, bool picking)

+{

+    const size_t cache_size = m_editing_mode ? m_editing_cache.size() : m_normal_cache.size();

+

+    const bool has_points = (cache_size != 0);

+    const bool has_holes = (! m_c->hollowed_mesh()->get_hollowed_mesh()

+                   && ! m_c->selection_info()->model_object()->sla_drain_holes.empty());

+

+    if (! has_points && ! has_holes)

+        return;

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    GLShaderProgram* shader = wxGetApp().get_shader(picking ? "flat" : "gouraud_light");

+    if (shader == nullptr)

+        return;

+

+    shader->start_using();

+    ScopeGuard guard([shader]() { shader->stop_using(); });

+#else

+    GLShaderProgram* shader = picking ? nullptr : wxGetApp().get_shader("gouraud_light");

+    if (shader != nullptr)

+        shader->start_using();

+    ScopeGuard guard([shader]() {

+        if (shader != nullptr)

+            shader->stop_using();

+    });

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    const GLVolume* vol = selection.get_volume(*selection.get_volume_idxs().begin());

+    Geometry::Transformation transformation(vol->get_instance_transformation().get_matrix() * vol->get_volume_transformation().get_matrix());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d instance_scaling_matrix_inverse = transformation.get_scaling_factor_matrix().inverse();

+#else

+    const Transform3d& instance_scaling_matrix_inverse = transformation.get_matrix(true, true, false, true).inverse();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+    const Transform3d instance_matrix = Geometry::assemble_transform(m_c->selection_info()->get_sla_shift() * Vec3d::UnitZ()) * transformation.get_matrix();

+    const Camera& camera = wxGetApp().plater()->get_camera();

+    const Transform3d& view_matrix = camera.get_view_matrix();

+    const Transform3d& projection_matrix = camera.get_projection_matrix();

+

+    shader->set_uniform("projection_matrix", projection_matrix);

+#else

+    const Transform3d& instance_matrix = transformation.get_matrix();

+    const float z_shift = m_c->selection_info()->get_sla_shift();

+    glsafe(::glPushMatrix());

+    glsafe(::glTranslated(0.0, 0.0, z_shift));

+    glsafe(::glMultMatrixd(instance_matrix.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+    ColorRGBA render_color;

+    for (size_t i = 0; i < cache_size; ++i) {

+        const sla::SupportPoint& support_point = m_editing_mode ? m_editing_cache[i].support_point : m_normal_cache[i];

+        const bool point_selected = m_editing_mode ? m_editing_cache[i].selected : false;

+

+        if (is_mesh_point_clipped(support_point.pos.cast<double>()))

+            continue;

+

+        // First decide about the color of the point.

+        if (picking)

+            render_color = picking_color_component(i);

+        else {

+            if (size_t(m_hover_id) == i && m_editing_mode) // ignore hover state unless editing mode is active

+                render_color = { 0.f, 1.f, 1.f, 1.f };

+            else { // neigher hover nor picking

+                bool supports_new_island = m_lock_unique_islands && support_point.is_new_island;

+                if (m_editing_mode) {

+                    if (point_selected)

+                        render_color = { 1.f, 0.3f, 0.3f, 1.f};

+                    else

+                        if (supports_new_island)

+                            render_color = { 0.3f, 0.3f, 1.f, 1.f };

+                        else

+                            render_color = { 0.7f, 0.7f, 0.7f, 1.f };

+                }

+                else

+                    render_color = { 0.5f, 0.5f, 0.5f, 1.f };

+            }

+        }

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        m_cone.set_color(render_color);

+        m_sphere.set_color(render_color);

+        if (!picking)

+#else

+        m_cone.set_color(-1, render_color);

+        m_sphere.set_color(-1, render_color);

+        if (shader && !picking)

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+            shader->set_uniform("emission_factor", 0.5f);

+

+        // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Transform3d support_matrix = Geometry::assemble_transform(support_point.pos.cast<double>()) * instance_scaling_matrix_inverse;

+#else

+        glsafe(::glPushMatrix());

+        glsafe(::glTranslatef(support_point.pos.x(), support_point.pos.y(), support_point.pos.z()));

+        glsafe(::glMultMatrixd(instance_scaling_matrix_inverse.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+        if (vol->is_left_handed())

+            glFrontFace(GL_CW);

+

+        // Matrices set, we can render the point mark now.

+        // If in editing mode, we'll also render a cone pointing to the sphere.

+        if (m_editing_mode) {

+            // in case the normal is not yet cached, find and cache it

+            if (m_editing_cache[i].normal == Vec3f::Zero())

+                m_c->raycaster()->raycaster()->get_closest_point(m_editing_cache[i].support_point.pos, &m_editing_cache[i].normal);

+

+            Eigen::Quaterniond q;

+            q.setFromTwoVectors(Vec3d::UnitZ(), instance_scaling_matrix_inverse * m_editing_cache[i].normal.cast<double>());

+            const Eigen::AngleAxisd aa(q);

+            const double cone_radius = 0.25; // mm

+            const double cone_height = 0.75;

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+            const Transform3d view_model_matrix = view_matrix * instance_matrix * support_matrix * Transform3d(aa.toRotationMatrix()) *

+                Geometry::assemble_transform((cone_height + support_point.head_front_radius * RenderPointScale) * Vec3d::UnitZ(),

+                    Vec3d(PI, 0.0, 0.0), Vec3d(cone_radius, cone_radius, cone_height));

+

+            shader->set_uniform("view_model_matrix", view_model_matrix);

+            shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());

+#else

+            glsafe(::glPushMatrix());

+            glsafe(::glRotated(aa.angle() * (180. / M_PI), aa.axis().x(), aa.axis().y(), aa.axis().z()));

+            glsafe(::glTranslatef(0.f, 0.f, cone_height + support_point.head_front_radius * RenderPointScale));

+            glsafe(::glRotated(180., 1., 0., 0.));

+            glsafe(::glScaled(cone_radius, cone_radius, cone_height));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+            m_cone.render();

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+            glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+        }

+

+        const double radius = (double)support_point.head_front_radius * RenderPointScale;

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Transform3d view_model_matrix = view_matrix * instance_matrix * support_matrix *

+            Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), radius * Vec3d::Ones());

+

+        shader->set_uniform("view_model_matrix", view_model_matrix);

+        shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());

+#else

+        glsafe(::glPushMatrix());

+        glsafe(::glScaled(radius, radius, radius));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        m_sphere.render();

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+        glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+

+        if (vol->is_left_handed())

+            glFrontFace(GL_CCW);

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+        glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+    }

+

+    // Now render the drain holes:

+    if (has_holes && ! picking) {

+        render_color = { 0.7f, 0.7f, 0.7f, 0.7f };

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+        m_cylinder.set_color(render_color);

+#else

+        m_cylinder.set_color(-1, render_color);

+        if (shader != nullptr)

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+        shader->set_uniform("emission_factor", 0.5f);

+        for (const sla::DrainHole& drain_hole : m_c->selection_info()->model_object()->sla_drain_holes) {

+            if (is_mesh_point_clipped(drain_hole.pos.cast<double>()))

+                continue;

+

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+            const Transform3d hole_matrix = Geometry::assemble_transform(drain_hole.pos.cast<double>()) * instance_scaling_matrix_inverse;

+#else

+            // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.

+            glsafe(::glPushMatrix());

+            glsafe(::glTranslatef(drain_hole.pos.x(), drain_hole.pos.y(), drain_hole.pos.z()));

+            glsafe(::glMultMatrixd(instance_scaling_matrix_inverse.data()));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+            if (vol->is_left_handed())

+                glFrontFace(GL_CW);

+

+            // Matrices set, we can render the point mark now.

+            Eigen::Quaterniond q;

+            q.setFromTwoVectors(Vec3d::UnitZ(), instance_scaling_matrix_inverse * (-drain_hole.normal).cast<double>());

+            const Eigen::AngleAxisd aa(q);

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+            const Transform3d view_model_matrix = view_matrix * instance_matrix * hole_matrix * Transform3d(aa.toRotationMatrix()) *

+                Geometry::assemble_transform(-drain_hole.height * Vec3d::UnitZ(), Vec3d::Zero(), Vec3d(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));

+

+            shader->set_uniform("view_model_matrix", view_model_matrix);

+            shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());

+#else

+            glsafe(::glRotated(aa.angle() * (180. / M_PI), aa.axis().x(), aa.axis().y(), aa.axis().z()));

+            glsafe(::glTranslated(0., 0., -drain_hole.height));

+            glsafe(::glScaled(drain_hole.radius, drain_hole.radius, drain_hole.height + sla::HoleStickOutLength));

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+            m_cylinder.render();

+

+            if (vol->is_left_handed())

+                glFrontFace(GL_CCW);

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+            glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+        }

+    }

+

+#if !ENABLE_GL_SHADERS_ATTRIBUTES

+    glsafe(::glPopMatrix());

+#endif // !ENABLE_GL_SHADERS_ATTRIBUTES

+}

+

+

+

+bool GLGizmoSlaSupports::is_mesh_point_clipped(const Vec3d& point) const

+{

+    if (m_c->object_clipper()->get_position() == 0.)

+        return false;

+

+    auto sel_info = m_c->selection_info();

+    int active_inst = m_c->selection_info()->get_active_instance();

+    const ModelInstance* mi = sel_info->model_object()->instances[active_inst];

+    const Transform3d& trafo = mi->get_transformation().get_matrix() * sel_info->model_object()->volumes.front()->get_matrix();

+

+    Vec3d transformed_point =  trafo * point;

+    transformed_point(2) += sel_info->get_sla_shift();

+    return m_c->object_clipper()->get_clipping_plane()->is_point_clipped(transformed_point);

+}

+

+

+

+// Unprojects the mouse position on the mesh and saves hit point and normal of the facet into pos_and_normal

+// Return false if no intersection was found, true otherwise.

+bool GLGizmoSlaSupports::unproject_on_mesh(const Vec2d& mouse_pos, std::pair<Vec3f, Vec3f>& pos_and_normal)

+{

+    if (! m_c->raycaster()->raycaster())

+        return false;

+

+    const Camera& camera = wxGetApp().plater()->get_camera();

+    const Selection& selection = m_parent.get_selection();

+    const GLVolume* volume = selection.get_volume(*selection.get_volume_idxs().begin());

+    Geometry::Transformation trafo = volume->get_instance_transformation() * volume->get_volume_transformation();

+    trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));

+

+    double clp_dist = m_c->object_clipper()->get_position();

+    const ClippingPlane* clp = m_c->object_clipper()->get_clipping_plane();

+

+    // The raycaster query

+    Vec3f hit;

+    Vec3f normal;

+    if (m_c->raycaster()->raycaster()->unproject_on_mesh(

+            mouse_pos,

+            trafo.get_matrix(),

+            camera,

+            hit,

+            normal,

+            clp_dist != 0. ? clp : nullptr))

+    {

+        // Check whether the hit is in a hole

+        bool in_hole = false;

+        // In case the hollowed and drilled mesh is available, we can allow

+        // placing points in holes, because they should never end up

+        // on surface that's been drilled away.

+        if (! m_c->hollowed_mesh()->get_hollowed_mesh()) {

+            sla::DrainHoles drain_holes = m_c->selection_info()->model_object()->sla_drain_holes;

+            for (const sla::DrainHole& hole : drain_holes) {

+                if (hole.is_inside(hit)) {

+                    in_hole = true;

+                    break;

+                }

+            }

+        }

+        if (! in_hole) {

+            // Return both the point and the facet normal.

+            pos_and_normal = std::make_pair(hit, normal);

+            return true;

+        }

+    }

+

+    return false;

+}

+

+// Following function is called from GLCanvas3D to inform the gizmo about a mouse/keyboard event.

+// The gizmo has an opportunity to react - if it does, it should return true so that the Canvas3D is

+// aware that the event was reacted to and stops trying to make different sense of it. If the gizmo

+// concludes that the event was not intended for it, it should return false.

+bool GLGizmoSlaSupports::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)

+{

+    ModelObject* mo = m_c->selection_info()->model_object();

+    int active_inst = m_c->selection_info()->get_active_instance();

+

+    if (m_editing_mode) {

+

+        // left down with shift - show the selection rectangle:

+        if (action == SLAGizmoEventType::LeftDown && (shift_down || alt_down || control_down)) {

+            if (m_hover_id == -1) {

+                if (shift_down || alt_down) {

+                    m_selection_rectangle.start_dragging(mouse_position, shift_down ? GLSelectionRectangle::EState::Select : GLSelectionRectangle::EState::Deselect);

+                }

+            }

+            else {

+                if (m_editing_cache[m_hover_id].selected)

+                    unselect_point(m_hover_id);

+                else {

+                    if (!alt_down)

+                        select_point(m_hover_id);

+                }

+            }

+

+            return true;

+        }

+

+        // left down without selection rectangle - place point on the mesh:

+        if (action == SLAGizmoEventType::LeftDown && !m_selection_rectangle.is_dragging() && !shift_down) {

+            // If any point is in hover state, this should initiate its move - return control back to GLCanvas:

+            if (m_hover_id != -1)

+                return false;

+

+            // If there is some selection, don't add new point and deselect everything instead.

+            if (m_selection_empty) {

+                std::pair<Vec3f, Vec3f> pos_and_normal;

+                if (unproject_on_mesh(mouse_position, pos_and_normal)) { // we got an intersection

+                    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Add support point"));

+                    m_editing_cache.emplace_back(sla::SupportPoint(pos_and_normal.first, m_new_point_head_diameter/2.f, false), false, pos_and_normal.second);

+                    m_parent.set_as_dirty();

+                    m_wait_for_up_event = true;

+                }

+                else

+                    return false;

+            }

+            else

+                select_point(NoPoints);

+

+            return true;

+        }

+

+        // left up with selection rectangle - select points inside the rectangle:

+        if ((action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::ShiftUp || action == SLAGizmoEventType::AltUp) && m_selection_rectangle.is_dragging()) {

+            // Is this a selection or deselection rectangle?

+            GLSelectionRectangle::EState rectangle_status = m_selection_rectangle.get_state();

+

+            // First collect positions of all the points in world coordinates.

+            Geometry::Transformation trafo = mo->instances[active_inst]->get_transformation();

+            trafo.set_offset(trafo.get_offset() + Vec3d(0., 0., m_c->selection_info()->get_sla_shift()));

+            std::vector<Vec3d> points;

+            for (unsigned int i=0; i<m_editing_cache.size(); ++i)

+                points.push_back(trafo.get_matrix() * m_editing_cache[i].support_point.pos.cast<double>());

+

+            // Now ask the rectangle which of the points are inside.

+            std::vector<Vec3f> points_inside;

+            std::vector<unsigned int> points_idxs = m_selection_rectangle.stop_dragging(m_parent, points);

+            for (size_t idx : points_idxs)

+                points_inside.push_back(points[idx].cast<float>());

+

+            // Only select/deselect points that are actually visible. We want to check not only

+            // the point itself, but also the center of base of its cone, so the points don't hide

+            // under every miniature irregularity on the model. Remember the actual number and

+            // append the cone bases.

+            size_t orig_pts_num = points_inside.size();

+            for (size_t idx : points_idxs)

+                points_inside.emplace_back((trafo.get_matrix().cast<float>() * (m_editing_cache[idx].support_point.pos + m_editing_cache[idx].normal)).cast<float>());

+

+            for (size_t idx : m_c->raycaster()->raycaster()->get_unobscured_idxs(

+                     trafo, wxGetApp().plater()->get_camera(), points_inside,

+                     m_c->object_clipper()->get_clipping_plane()))

+            {

+                if (idx >= orig_pts_num) // this is a cone-base, get index of point it belongs to

+                    idx -= orig_pts_num;

+                if (rectangle_status == GLSelectionRectangle::EState::Deselect)

+                    unselect_point(points_idxs[idx]);

+                else

+                    select_point(points_idxs[idx]);

+            }

+            return true;

+        }

+

+        // left up with no selection rectangle

+        if (action == SLAGizmoEventType::LeftUp) {

+            if (m_wait_for_up_event) {

+                m_wait_for_up_event = false;

+                return true;

+            }

+        }

+

+        // dragging the selection rectangle:

+        if (action == SLAGizmoEventType::Dragging) {

+            if (m_wait_for_up_event)

+                return true; // point has been placed and the button not released yet

+                             // this prevents GLCanvas from starting scene rotation

+

+            if (m_selection_rectangle.is_dragging())  {

+                m_selection_rectangle.dragging(mouse_position);

+                return true;

+            }

+

+            return false;

+        }

+

+        if (action == SLAGizmoEventType::Delete) {

+            // delete key pressed

+            delete_selected_points();

+            return true;

+        }

+

+        if (action ==  SLAGizmoEventType::ApplyChanges) {

+            editing_mode_apply_changes();

+            return true;

+        }

+

+        if (action ==  SLAGizmoEventType::DiscardChanges) {

+            ask_about_changes_call_after([this](){ editing_mode_apply_changes(); },

+                                         [this](){ editing_mode_discard_changes(); });

+            return true;

+        }

+

+        if (action == SLAGizmoEventType::RightDown) {

+            if (m_hover_id != -1) {

+                select_point(NoPoints);

+                select_point(m_hover_id);

+                delete_selected_points();

+                return true;

+            }

+            return false;

+        }

+

+        if (action == SLAGizmoEventType::SelectAll) {

+            select_point(AllPoints);

+            return true;

+        }

+    }

+

+    if (!m_editing_mode) {

+        if (action == SLAGizmoEventType::AutomaticGeneration) {

+            auto_generate();

+            return true;

+        }

+

+        if (action == SLAGizmoEventType::ManualEditing) {

+            switch_to_editing_mode();

+            return true;

+        }

+    }

+

+    if (action == SLAGizmoEventType::MouseWheelUp && control_down) {

+        double pos = m_c->object_clipper()->get_position();

+        pos = std::min(1., pos + 0.01);

+        m_c->object_clipper()->set_position(pos, true);

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::MouseWheelDown && control_down) {

+        double pos = m_c->object_clipper()->get_position();

+        pos = std::max(0., pos - 0.01);

+        m_c->object_clipper()->set_position(pos, true);

+        return true;

+    }

+

+    if (action == SLAGizmoEventType::ResetClippingPlane) {

+        m_c->object_clipper()->set_position(-1., false);

+        return true;

+    }

+

+    return false;

+}

+

+void GLGizmoSlaSupports::delete_selected_points(bool force)

+{

+    if (! m_editing_mode) {

+        std::cout << "DEBUGGING: delete_selected_points called out of editing mode!" << std::endl;

+        std::abort();

+    }

+

+    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Delete support point"));

+

+    for (unsigned int idx=0; idx<m_editing_cache.size(); ++idx) {

+        if (m_editing_cache[idx].selected && (!m_editing_cache[idx].support_point.is_new_island || !m_lock_unique_islands || force)) {

+            m_editing_cache.erase(m_editing_cache.begin() + (idx--));

+        }

+    }

+

+    select_point(NoPoints);

+}

+

+std::vector<const ConfigOption*> GLGizmoSlaSupports::get_config_options(const std::vector<std::string>& keys) const

+{

+    std::vector<const ConfigOption*> out;

+    const ModelObject* mo = m_c->selection_info()->model_object();

+

+    if (! mo)

+        return out;

+

+    const DynamicPrintConfig& object_cfg = mo->config.get();

+    const DynamicPrintConfig& print_cfg = wxGetApp().preset_bundle->sla_prints.get_edited_preset().config;

+    std::unique_ptr<DynamicPrintConfig> default_cfg = nullptr;

+

+    for (const std::string& key : keys) {

+        if (object_cfg.has(key))

+            out.push_back(object_cfg.option(key));

+        else

+            if (print_cfg.has(key))

+                out.push_back(print_cfg.option(key));

+            else { // we must get it from defaults

+                if (default_cfg == nullptr)

+                    default_cfg.reset(DynamicPrintConfig::new_from_defaults_keys(keys));

+                out.push_back(default_cfg->option(key));

+            }

+    }

+

+    return out;

+}

+

+

+

+/*

+void GLGizmoSlaSupports::find_intersecting_facets(const igl::AABB<Eigen::MatrixXf, 3>* aabb, const Vec3f& normal, double offset, std::vector<unsigned int>& idxs) const

+{

+    if (aabb->is_leaf()) { // this is a facet

+        // corner.dot(normal) - offset

+        idxs.push_back(aabb->m_primitive);

+    }

+    else { // not a leaf

+    using CornerType = Eigen::AlignedBox<float, 3>::CornerType;

+        bool sign = std::signbit(offset - normal.dot(aabb->m_box.corner(CornerType(0))));

+        for (unsigned int i=1; i<8; ++i)

+            if (std::signbit(offset - normal.dot(aabb->m_box.corner(CornerType(i)))) != sign) {

+                find_intersecting_facets(aabb->m_left, normal, offset, idxs);

+                find_intersecting_facets(aabb->m_right, normal, offset, idxs);

+            }

+    }

+}

+

+

+

+void GLGizmoSlaSupports::make_line_segments() const

+{

+    TriangleMeshSlicer tms(&m_c->m_model_object->volumes.front()->mesh);

+    Vec3f normal(0.f, 1.f, 1.f);

+    double d = 0.;

+

+    std::vector<IntersectionLine> lines;

+    find_intersections(&m_AABB, normal, d, lines);

+    ExPolygons expolys;

+    tms.make_expolygons_simple(lines, &expolys);

+

+    SVG svg("slice_loops.svg", get_extents(expolys));

+    svg.draw(expolys);

+    //for (const IntersectionLine &l : lines[i])

+    //    svg.draw(l, "red", 0);

+    //svg.draw_outline(expolygons, "black", "blue", 0);

+    svg.Close();

+}

+*/

+

+

+void GLGizmoSlaSupports::on_render_input_window(float x, float y, float bottom_limit)

+{

+    static float last_y = 0.0f;

+    static float last_h = 0.0f;

+

+    ModelObject* mo = m_c->selection_info()->model_object();

+

+    if (! mo)

+        return;

+

+    bool first_run = true; // This is a hack to redraw the button when all points are removed,

+                           // so it is not delayed until the background process finishes.

+RENDER_AGAIN:

+    //m_imgui->set_next_window_pos(x, y, ImGuiCond_Always);

+    //const ImVec2 window_size(m_imgui->scaled(18.f, 16.f));

+    //ImGui::SetNextWindowPos(ImVec2(x, y - std::max(0.f, y+window_size.y-bottom_limit) ));

+    //ImGui::SetNextWindowSize(ImVec2(window_size));

+

+    m_imgui->begin(get_name(), ImGuiWindowFlags_NoMove | ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoCollapse);

+

+    // adjust window position to avoid overlap the view toolbar

+    float win_h = ImGui::GetWindowHeight();

+    y = std::min(y, bottom_limit - win_h);

+    ImGui::SetWindowPos(ImVec2(x, y), ImGuiCond_Always);

+    if ((last_h != win_h) || (last_y != y))

+    {

+        // ask canvas for another frame to render the window in the correct position

+        m_imgui->set_requires_extra_frame();

+        if (last_h != win_h)

+            last_h = win_h;

+        if (last_y != y)

+            last_y = y;

+    }

+

+    // First calculate width of all the texts that are could possibly be shown. We will decide set the dialog width based on that:

+

+    const float settings_sliders_left = std::max(m_imgui->calc_text_size(m_desc.at("minimal_distance")).x, m_imgui->calc_text_size(m_desc.at("points_density")).x) + m_imgui->scaled(1.f);

+    const float clipping_slider_left = std::max(m_imgui->calc_text_size(m_desc.at("clipping_of_view")).x, m_imgui->calc_text_size(m_desc.at("reset_direction")).x) + m_imgui->scaled(1.5f);

+    const float diameter_slider_left = m_imgui->calc_text_size(m_desc.at("head_diameter")).x + m_imgui->scaled(1.f);

+    const float minimal_slider_width = m_imgui->scaled(4.f);

+    const float buttons_width_approx = m_imgui->calc_text_size(m_desc.at("apply_changes")).x + m_imgui->calc_text_size(m_desc.at("discard_changes")).x + m_imgui->scaled(1.5f);

+    const float lock_supports_width_approx = m_imgui->calc_text_size(m_desc.at("lock_supports")).x + m_imgui->scaled(2.f);

+

+    float window_width = minimal_slider_width + std::max(std::max(settings_sliders_left, clipping_slider_left), diameter_slider_left);

+    window_width = std::max(std::max(window_width, buttons_width_approx), lock_supports_width_approx);

+

+    bool force_refresh = false;

+    bool remove_selected = false;

+    bool remove_all = false;

+

+    if (m_editing_mode) {

+

+        float diameter_upper_cap = static_cast<ConfigOptionFloat*>(wxGetApp().preset_bundle->sla_prints.get_edited_preset().config.option("support_pillar_diameter"))->value;

+        if (m_new_point_head_diameter > diameter_upper_cap)

+            m_new_point_head_diameter = diameter_upper_cap;

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("head_diameter"));

+        ImGui::SameLine(diameter_slider_left);

+        ImGui::PushItemWidth(window_width - diameter_slider_left);

+

+        // Following is a nasty way to:

+        //  - save the initial value of the slider before one starts messing with it

+        //  - keep updating the head radius during sliding so it is continuosly refreshed in 3D scene

+        //  - take correct undo/redo snapshot after the user is done with moving the slider

+        float initial_value = m_new_point_head_diameter;

+        m_imgui->slider_float("##head_diameter", &m_new_point_head_diameter, 0.1f, diameter_upper_cap, "%.1f");

+        if (m_imgui->get_last_slider_status().clicked) {

+            if (m_old_point_head_diameter == 0.f)

+                m_old_point_head_diameter = initial_value;

+        }

+        if (m_imgui->get_last_slider_status().edited) {

+            for (auto& cache_entry : m_editing_cache)

+                if (cache_entry.selected)

+                    cache_entry.support_point.head_front_radius = m_new_point_head_diameter / 2.f;

+        }

+        if (m_imgui->get_last_slider_status().deactivated_after_edit) {

+            // momentarily restore the old value to take snapshot

+            for (auto& cache_entry : m_editing_cache)

+                if (cache_entry.selected)

+                    cache_entry.support_point.head_front_radius = m_old_point_head_diameter / 2.f;

+            float backup = m_new_point_head_diameter;

+            m_new_point_head_diameter = m_old_point_head_diameter;

+            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Change point head diameter"));

+            m_new_point_head_diameter = backup;

+            for (auto& cache_entry : m_editing_cache)

+                if (cache_entry.selected)

+                    cache_entry.support_point.head_front_radius = m_new_point_head_diameter / 2.f;

+            m_old_point_head_diameter = 0.f;

+        }

+

+        bool changed = m_lock_unique_islands;

+        m_imgui->checkbox(m_desc.at("lock_supports"), m_lock_unique_islands);

+        force_refresh |= changed != m_lock_unique_islands;

+

+        m_imgui->disabled_begin(m_selection_empty);

+        remove_selected = m_imgui->button(m_desc.at("remove_selected"));

+        m_imgui->disabled_end();

+

+        m_imgui->disabled_begin(m_editing_cache.empty());

+        remove_all = m_imgui->button(m_desc.at("remove_all"));

+        m_imgui->disabled_end();

+

+        m_imgui->text(" "); // vertical gap

+

+        if (m_imgui->button(m_desc.at("apply_changes"))) {

+            editing_mode_apply_changes();

+            force_refresh = true;

+        }

+        ImGui::SameLine();

+        bool discard_changes = m_imgui->button(m_desc.at("discard_changes"));

+        if (discard_changes) {

+            editing_mode_discard_changes();

+            force_refresh = true;

+        }

+    }

+    else { // not in editing mode:

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("minimal_distance"));

+        ImGui::SameLine(settings_sliders_left);

+        ImGui::PushItemWidth(window_width - settings_sliders_left);

+

+        std::vector<const ConfigOption*> opts = get_config_options({"support_points_density_relative", "support_points_minimal_distance"});

+        float density = static_cast<const ConfigOptionInt*>(opts[0])->value;

+        float minimal_point_distance = static_cast<const ConfigOptionFloat*>(opts[1])->value;

+

+        m_imgui->slider_float("##minimal_point_distance", &minimal_point_distance, 0.f, 20.f, "%.f mm");

+        bool slider_clicked = m_imgui->get_last_slider_status().clicked; // someone clicked the slider

+        bool slider_edited = m_imgui->get_last_slider_status().edited; // someone is dragging the slider

+        bool slider_released = m_imgui->get_last_slider_status().deactivated_after_edit; // someone has just released the slider

+

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("points_density"));

+        ImGui::SameLine(settings_sliders_left);

+

+        m_imgui->slider_float("##points_density", &density, 0.f, 200.f, "%.f %%");

+        slider_clicked |= m_imgui->get_last_slider_status().clicked;

+        slider_edited |= m_imgui->get_last_slider_status().edited;

+        slider_released |= m_imgui->get_last_slider_status().deactivated_after_edit;

+

+        if (slider_clicked) { // stash the values of the settings so we know what to revert to after undo

+            m_minimal_point_distance_stash = minimal_point_distance;

+            m_density_stash = density;

+        }

+        if (slider_edited) {

+            mo->config.set("support_points_minimal_distance", minimal_point_distance);

+            mo->config.set("support_points_density_relative", (int)density);

+        }

+        if (slider_released) {

+            mo->config.set("support_points_minimal_distance", m_minimal_point_distance_stash);

+            mo->config.set("support_points_density_relative", (int)m_density_stash);

+            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Support parameter change"));

+            mo->config.set("support_points_minimal_distance", minimal_point_distance);

+            mo->config.set("support_points_density_relative", (int)density);

+            wxGetApp().obj_list()->update_and_show_object_settings_item();

+        }

+

+        bool generate = m_imgui->button(m_desc.at("auto_generate"));

+

+        if (generate)

+            auto_generate();

+

+        ImGui::Separator();

+        if (m_imgui->button(m_desc.at("manual_editing")))

+            switch_to_editing_mode();

+

+        m_imgui->disabled_begin(m_normal_cache.empty());

+        remove_all = m_imgui->button(m_desc.at("remove_all"));

+        m_imgui->disabled_end();

+

+        // m_imgui->text("");

+        // m_imgui->text(m_c->m_model_object->sla_points_status == sla::PointsStatus::NoPoints ? _(L("No points  (will be autogenerated)")) :

+        //              (m_c->m_model_object->sla_points_status == sla::PointsStatus::AutoGenerated ? _(L("Autogenerated points (no modifications)")) :

+        //              (m_c->m_model_object->sla_points_status == sla::PointsStatus::UserModified ? _(L("User-modified points")) :

+        //              (m_c->m_model_object->sla_points_status == sla::PointsStatus::Generating ? _(L("Generation in progress...")) : "UNKNOWN STATUS"))));

+    }

+

+

+    // Following is rendered in both editing and non-editing mode:

+    ImGui::Separator();

+    if (m_c->object_clipper()->get_position() == 0.f) {

+        ImGui::AlignTextToFramePadding();

+        m_imgui->text(m_desc.at("clipping_of_view"));

+    }

+    else {

+        if (m_imgui->button(m_desc.at("reset_direction"))) {

+            wxGetApp().CallAfter([this](){

+                    m_c->object_clipper()->set_position(-1., false);

+                });

+        }

+    }

+

+    ImGui::SameLine(clipping_slider_left);

+    ImGui::PushItemWidth(window_width - clipping_slider_left);

+    float clp_dist = m_c->object_clipper()->get_position();

+    if (m_imgui->slider_float("##clp_dist", &clp_dist, 0.f, 1.f, "%.2f"))

+        m_c->object_clipper()->set_position(clp_dist, true);

+

+

+    if (m_imgui->button("?")) {

+        wxGetApp().CallAfter([]() {

+            SlaGizmoHelpDialog help_dlg;

+            help_dlg.ShowModal();

+        });

+    }

+

+    m_imgui->end();

+

+    if (remove_selected || remove_all) {

+        force_refresh = false;

+        m_parent.set_as_dirty();

+        bool was_in_editing = m_editing_mode;

+        if (! was_in_editing)

+            switch_to_editing_mode();

+        if (remove_all) {

+            select_point(AllPoints);

+            delete_selected_points(true); // true - delete regardless of locked status

+        }

+        if (remove_selected)

+            delete_selected_points(false); // leave locked points

+        if (! was_in_editing)

+            editing_mode_apply_changes();

+

+        if (first_run) {

+            first_run = false;

+            goto RENDER_AGAIN;

+        }

+    }

+

+    if (force_refresh)

+        m_parent.set_as_dirty();

+}

+

+bool GLGizmoSlaSupports::on_is_activable() const

+{

+    const Selection& selection = m_parent.get_selection();

+

+    if (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() != ptSLA

+        || !selection.is_from_single_instance())

+        return false;

+

+    // Check that none of the selected volumes is outside. Only SLA auxiliaries (supports) are allowed outside.

+    const Selection::IndicesList& list = selection.get_volume_idxs();

+    for (const auto& idx : list)

+        if (selection.get_volume(idx)->is_outside && selection.get_volume(idx)->composite_id.volume_id >= 0)

+            return false;

+

+    return true;

+}

+

+bool GLGizmoSlaSupports::on_is_selectable() const

+{

+    return (wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology() == ptSLA);

+}

+

+std::string GLGizmoSlaSupports::on_get_name() const

+{

+    return _u8L("SLA Support Points");

+}

+

+CommonGizmosDataID GLGizmoSlaSupports::on_get_requirements() const

+{

+    return CommonGizmosDataID(

+                int(CommonGizmosDataID::SelectionInfo)

+              | int(CommonGizmosDataID::InstancesHider)

+              | int(CommonGizmosDataID::Raycaster)

+              | int(CommonGizmosDataID::HollowedMesh)

+              | int(CommonGizmosDataID::ObjectClipper)

+              | int(CommonGizmosDataID::SupportsClipper));

+}

+

+

+

+void GLGizmoSlaSupports::ask_about_changes_call_after(std::function<void()> on_yes, std::function<void()> on_no)

+{

+    wxGetApp().CallAfter([on_yes, on_no]() {

+        // Following is called through CallAfter, because otherwise there was a problem

+        // on OSX with the wxMessageDialog being shown several times when clicked into.

+        MessageDialog dlg(GUI::wxGetApp().mainframe, _L("Do you want to save your manually "

+            "edited support points?") + "\n",_L("Save support points?"), wxICON_QUESTION | wxYES | wxNO | wxCANCEL );

+        int ret = dlg.ShowModal();

+            if (ret == wxID_YES)

+                on_yes();

+            else if (ret == wxID_NO)

+                on_no();

+    });

+}

+

+

+void GLGizmoSlaSupports::on_set_state()

+{

+    if (m_state == m_old_state)

+        return;

+

+    if (m_state == On && m_old_state != On) { // the gizmo was just turned on

+        // Set default head diameter from config.

+        const DynamicPrintConfig& cfg = wxGetApp().preset_bundle->sla_prints.get_edited_preset().config;

+        m_new_point_head_diameter = static_cast<const ConfigOptionFloat*>(cfg.option("support_head_front_diameter"))->value;

+    }

+    if (m_state == Off && m_old_state != Off) { // the gizmo was just turned Off

+        bool will_ask = m_editing_mode && unsaved_changes() && on_is_activable();

+        if (will_ask) {

+            ask_about_changes_call_after([this](){ editing_mode_apply_changes(); },

+                                         [this](){ editing_mode_discard_changes(); });

+            // refuse to be turned off so the gizmo is active when the CallAfter is executed

+            m_state = m_old_state;

+        }

+        else {

+            // we are actually shutting down

+            disable_editing_mode(); // so it is not active next time the gizmo opens

+            m_old_mo_id = -1;

+        }

+    }

+    m_old_state = m_state;

+}

+

+

+

+void GLGizmoSlaSupports::on_start_dragging()

+{

+    if (m_hover_id != -1) {

+        select_point(NoPoints);

+        select_point(m_hover_id);

+        m_point_before_drag = m_editing_cache[m_hover_id];

+    }

+    else

+        m_point_before_drag = CacheEntry();

+}

+

+

+void GLGizmoSlaSupports::on_stop_dragging()

+{

+    if (m_hover_id != -1) {

+        CacheEntry backup = m_editing_cache[m_hover_id];

+

+        if (m_point_before_drag.support_point.pos != Vec3f::Zero() // some point was touched

+         && backup.support_point.pos != m_point_before_drag.support_point.pos) // and it was moved, not just selected

+        {

+            m_editing_cache[m_hover_id] = m_point_before_drag;

+            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Move support point"));

+            m_editing_cache[m_hover_id] = backup;

+        }

+    }

+    m_point_before_drag = CacheEntry();

+}

+

+void GLGizmoSlaSupports::on_dragging(const UpdateData &data)

+{

+    assert(m_hover_id != -1);

+    if (!m_editing_mode) return;

+    if (m_editing_cache[m_hover_id].support_point.is_new_island && m_lock_unique_islands)

+        return;

+    

+    std::pair<Vec3f, Vec3f> pos_and_normal;

+    if (!unproject_on_mesh(data.mouse_pos.cast<double>(), pos_and_normal))

+        return;

+

+    m_editing_cache[m_hover_id].support_point.pos = pos_and_normal.first;

+    m_editing_cache[m_hover_id].support_point.is_new_island = false;

+    m_editing_cache[m_hover_id].normal = pos_and_normal.second;        

+}

+

+void GLGizmoSlaSupports::on_load(cereal::BinaryInputArchive& ar)

+{

+    ar(m_new_point_head_diameter,

+       m_normal_cache,

+       m_editing_cache,

+       m_selection_empty

+    );

+}

+

+

+

+void GLGizmoSlaSupports::on_save(cereal::BinaryOutputArchive& ar) const

+{

+    ar(m_new_point_head_diameter,

+       m_normal_cache,

+       m_editing_cache,

+       m_selection_empty

+    );

+}

+

+

+

+void GLGizmoSlaSupports::select_point(int i)

+{

+    if (! m_editing_mode) {

+        std::cout << "DEBUGGING: select_point called when out of editing mode!" << std::endl;

+        std::abort();

+    }

+

+    if (i == AllPoints || i == NoPoints) {

+        for (auto& point_and_selection : m_editing_cache)

+            point_and_selection.selected = ( i == AllPoints );

+        m_selection_empty = (i == NoPoints);

+

+        if (i == AllPoints)

+            m_new_point_head_diameter = m_editing_cache[0].support_point.head_front_radius * 2.f;

+    }

+    else {

+        m_editing_cache[i].selected = true;

+        m_selection_empty = false;

+        m_new_point_head_diameter = m_editing_cache[i].support_point.head_front_radius * 2.f;

+    }

+}

+

+

+void GLGizmoSlaSupports::unselect_point(int i)

+{

+    if (! m_editing_mode) {

+        std::cout << "DEBUGGING: unselect_point called when out of editing mode!" << std::endl;

+        std::abort();

+    }

+

+    m_editing_cache[i].selected = false;

+    m_selection_empty = true;

+    for (const CacheEntry& ce : m_editing_cache) {

+        if (ce.selected) {

+            m_selection_empty = false;

+            break;

+        }

+    }

+}

+

+

+

+

+void GLGizmoSlaSupports::editing_mode_discard_changes()

+{

+    if (! m_editing_mode) {

+        std::cout << "DEBUGGING: editing_mode_discard_changes called when out of editing mode!" << std::endl;

+        std::abort();

+    }

+    select_point(NoPoints);

+    disable_editing_mode();

+}

+

+

+

+void GLGizmoSlaSupports::editing_mode_apply_changes()

+{

+    // If there are no changes, don't touch the front-end. The data in the cache could have been

+    // taken from the backend and copying them to ModelObject would needlessly invalidate them.

+    disable_editing_mode(); // this leaves the editing mode undo/redo stack and must be done before the snapshot is taken

+

+    if (unsaved_changes()) {

+        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Support points edit"));

+

+        m_normal_cache.clear();

+        for (const CacheEntry& ce : m_editing_cache)

+            m_normal_cache.push_back(ce.support_point);

+

+        ModelObject* mo = m_c->selection_info()->model_object();

+        mo->sla_points_status = sla::PointsStatus::UserModified;

+        mo->sla_support_points.clear();

+        mo->sla_support_points = m_normal_cache;

+

+        reslice_SLA_supports();

+    }

+}

+

+

+

+void GLGizmoSlaSupports::reload_cache()

+{

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    m_normal_cache.clear();

+    if (mo->sla_points_status == sla::PointsStatus::AutoGenerated || mo->sla_points_status == sla::PointsStatus::Generating)

+        get_data_from_backend();

+    else

+        for (const sla::SupportPoint& point : mo->sla_support_points)

+            m_normal_cache.emplace_back(point);

+}

+

+

+bool GLGizmoSlaSupports::has_backend_supports() const

+{

+    const ModelObject* mo = m_c->selection_info()->model_object();

+    if (! mo)

+        return false;

+

+    // find SlaPrintObject with this ID

+    for (const SLAPrintObject* po : m_parent.sla_print()->objects()) {

+        if (po->model_object()->id() == mo->id())

+        	return po->is_step_done(slaposSupportPoints);

+    }

+    return false;

+}

+

+void GLGizmoSlaSupports::reslice_SLA_supports(bool postpone_error_messages) const

+{

+    wxGetApp().CallAfter([this, postpone_error_messages]() {

+        wxGetApp().plater()->reslice_SLA_supports(

+            *m_c->selection_info()->model_object(), postpone_error_messages);

+    });

+}

+

+bool GLGizmoSlaSupports::on_mouse(const wxMouseEvent &mouse_event){

+    if (mouse_event.Moving()) return false;

+    if (use_grabbers(mouse_event)) return true;

+

+    // wxCoord == int --> wx/types.h

+    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());

+    Vec2d mouse_pos = mouse_coord.cast<double>();

+

+    static bool pending_right_up = false;        

+    if (mouse_event.LeftDown()) {

+        bool grabber_contains_mouse = (get_hover_id() != -1);

+        bool control_down = mouse_event.CmdDown();

+        if ((!control_down || grabber_contains_mouse) &&

+            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))

+        return true;

+    } else if (mouse_event.Dragging()) {

+        bool control_down = mouse_event.CmdDown();

+        if (m_parent.get_move_volume_id() != -1) {

+            // don't allow dragging objects with the Sla gizmo on

+            return true;

+        } else if (!control_down &&

+                gizmo_event(SLAGizmoEventType::Dragging, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false)) {

+            // the gizmo got the event and took some action, no need to do

+            // anything more here

+            m_parent.set_as_dirty();

+            return true;

+        } else if (control_down && (mouse_event.LeftIsDown() || mouse_event.RightIsDown())){

+            // CTRL has been pressed while already dragging -> stop current action

+            if (mouse_event.LeftIsDown())

+                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);

+            else if (mouse_event.RightIsDown())

+                pending_right_up = false;

+        }

+    } else if (mouse_event.LeftUp() && !m_parent.is_mouse_dragging()) {

+        // in case SLA/FDM gizmo is selected, we just pass the LeftUp event

+        // and stop processing - neither object moving or selecting is

+        // suppressed in that case

+        gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());

+        return true;

+    }else if (mouse_event.RightDown()){

+        if (m_parent.get_selection().get_object_idx() != -1 &&

+            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) {

+            // we need to set the following right up as processed to avoid showing

+            // the context menu if the user release the mouse over the object

+            pending_right_up = true;

+            // event was taken care of by the SlaSupports gizmo

+            return true;

+        }

+    } else if (pending_right_up && mouse_event.RightUp()) {

+        pending_right_up = false;

+        return true;

+    }

+    return false;

+}

+

+void GLGizmoSlaSupports::get_data_from_backend()

+{

+    if (! has_backend_supports())

+        return;

+    ModelObject* mo = m_c->selection_info()->model_object();

+

+    // find the respective SLAPrintObject, we need a pointer to it

+    for (const SLAPrintObject* po : m_parent.sla_print()->objects()) {

+        if (po->model_object()->id() == mo->id()) {

+            m_normal_cache.clear();

+            const std::vector<sla::SupportPoint>& points = po->get_support_points();

+            auto mat = (po->trafo() * po->model_object()->volumes.front()->get_transformation().get_matrix()).inverse().cast<float>();

+            for (unsigned int i=0; i<points.size();++i)

+                m_normal_cache.emplace_back(sla::SupportPoint(mat * points[i].pos, points[i].head_front_radius, points[i].is_new_island));

+

+            mo->sla_points_status = sla::PointsStatus::AutoGenerated;

+            break;

+        }

+    }

+

+    // We don't copy the data into ModelObject, as this would stop the background processing.

+}

+

+

+

+void GLGizmoSlaSupports::auto_generate()

+{

+    //wxMessageDialog dlg(GUI::wxGetApp().plater(), 

+    MessageDialog dlg(GUI::wxGetApp().plater(), 

+                        _L("Autogeneration will erase all manually edited points.") + "\n\n" +

+                        _L("Are you sure you want to do it?") + "\n",

+                        _L("Warning"), wxICON_WARNING | wxYES | wxNO);

+

+    ModelObject* mo = m_c->selection_info()->model_object();

+

+    if (mo->sla_points_status != sla::PointsStatus::UserModified || m_normal_cache.empty() || dlg.ShowModal() == wxID_YES) {

+        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Autogenerate support points"));

+        wxGetApp().CallAfter([this]() { reslice_SLA_supports(); });

+        mo->sla_points_status = sla::PointsStatus::Generating;

+    }

+}

+

+

+

+void GLGizmoSlaSupports::switch_to_editing_mode()

+{

+    wxGetApp().plater()->enter_gizmos_stack();

+    m_editing_mode = true;

+    m_editing_cache.clear();

+    for (const sla::SupportPoint& sp : m_normal_cache)

+        m_editing_cache.emplace_back(sp);

+    select_point(NoPoints);

+

+    m_c->instances_hider()->show_supports(false);

+    m_parent.set_as_dirty();

+}

+

+

+void GLGizmoSlaSupports::disable_editing_mode()

+{

+    if (m_editing_mode) {

+        m_editing_mode = false;

+        wxGetApp().plater()->leave_gizmos_stack();

+        m_c->instances_hider()->show_supports(true);

+        m_parent.set_as_dirty();

+    }

+    wxGetApp().plater()->get_notification_manager()->close_notification_of_type(NotificationType::QuitSLAManualMode);

+}

+

+

+

+bool GLGizmoSlaSupports::unsaved_changes() const

+{

+    if (m_editing_cache.size() != m_normal_cache.size())

+        return true;

+

+    for (size_t i=0; i<m_editing_cache.size(); ++i)

+        if (m_editing_cache[i].support_point != m_normal_cache[i])

+            return true;

+

+    return false;

+}

+

+SlaGizmoHelpDialog::SlaGizmoHelpDialog()

+: wxDialog(nullptr, wxID_ANY, _L("SLA gizmo keyboard shortcuts"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE|wxRESIZE_BORDER)

+{

+    SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));

+    const wxString ctrl = GUI::shortkey_ctrl_prefix();

+    const wxString alt  = GUI::shortkey_alt_prefix();

+

+

+    // fonts

+    const wxFont& font = wxGetApp().small_font();

+    const wxFont& bold_font = wxGetApp().bold_font();

+

+    auto note_text = new wxStaticText(this, wxID_ANY, _L("Note: some shortcuts work in (non)editing mode only."));

+    note_text->SetFont(font);

+

+    auto vsizer    = new wxBoxSizer(wxVERTICAL);

+    auto gridsizer = new wxFlexGridSizer(2, 5, 15);

+    auto hsizer    = new wxBoxSizer(wxHORIZONTAL);

+

+    hsizer->AddSpacer(20);

+    hsizer->Add(vsizer);

+    hsizer->AddSpacer(20);

+

+    vsizer->AddSpacer(20);

+    vsizer->Add(note_text, 1, wxALIGN_CENTRE_HORIZONTAL);

+    vsizer->AddSpacer(20);

+    vsizer->Add(gridsizer);

+    vsizer->AddSpacer(20);

+

+    std::vector<std::pair<wxString, wxString>> shortcuts;

+    shortcuts.push_back(std::make_pair(_L("Left click"),              _L("Add point")));

+    shortcuts.push_back(std::make_pair(_L("Right click"),             _L("Remove point")));

+    shortcuts.push_back(std::make_pair(_L("Drag"),                    _L("Move point")));

+    shortcuts.push_back(std::make_pair(ctrl+_L("Left click"),         _L("Add point to selection")));

+    shortcuts.push_back(std::make_pair(alt+_L("Left click"),          _L("Remove point from selection")));

+    shortcuts.push_back(std::make_pair(wxString("Shift+")+_L("Drag"), _L("Select by rectangle")));

+    shortcuts.push_back(std::make_pair(alt+_(L("Drag")),              _L("Deselect by rectangle")));

+    shortcuts.push_back(std::make_pair(ctrl+"A",                      _L("Select all points")));

+    shortcuts.push_back(std::make_pair("Delete",                      _L("Remove selected points")));

+    shortcuts.push_back(std::make_pair(ctrl+_L("Mouse wheel"),        _L("Move clipping plane")));

+    shortcuts.push_back(std::make_pair("R",                           _L("Reset clipping plane")));

+    shortcuts.push_back(std::make_pair("Enter",                       _L("Apply changes")));

+    shortcuts.push_back(std::make_pair("Esc",                         _L("Discard changes")));

+    shortcuts.push_back(std::make_pair("M",                           _L("Switch to editing mode")));

+    shortcuts.push_back(std::make_pair("A",                           _L("Auto-generate points")));

+

+    for (const auto& pair : shortcuts) {

+        auto shortcut = new wxStaticText(this, wxID_ANY, pair.first);

+        auto desc = new wxStaticText(this, wxID_ANY, pair.second);

+        shortcut->SetFont(bold_font);

+        desc->SetFont(font);

+        gridsizer->Add(shortcut, -1, wxALIGN_CENTRE_VERTICAL);

+        gridsizer->Add(desc, -1, wxALIGN_CENTRE_VERTICAL);

+    }

+

+    SetSizer(hsizer);

+    hsizer->SetSizeHints(this);

+}

+

+

+

+} // namespace GUI

+} // namespace Slic3r

diff --git a/src/slic3r/GUI/MeshUtils.cpp b/src/slic3r/GUI/MeshUtils.cpp
index bbdcdeb34..777a4d7ba 100644
--- a/src/slic3r/GUI/MeshUtils.cpp
+++ b/src/slic3r/GUI/MeshUtils.cpp
@@ -1,370 +1,378 @@
-#include "MeshUtils.hpp"
-
-#include "libslic3r/Tesselate.hpp"
-#include "libslic3r/TriangleMesh.hpp"
-#include "libslic3r/TriangleMeshSlicer.hpp"
-#include "libslic3r/ClipperUtils.hpp"
-#include "libslic3r/Model.hpp"
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-#include "slic3r/GUI/GUI_App.hpp"
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-#include "slic3r/GUI/Camera.hpp"
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-#include "slic3r/GUI/Plater.hpp"
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-
-#include <GL/glew.h>
-
-#include <igl/unproject.h>
-
-
-namespace Slic3r {
-namespace GUI {
-
-void MeshClipper::set_plane(const ClippingPlane& plane)
-{
-    if (m_plane != plane) {
-        m_plane = plane;
-        m_triangles_valid = false;
-    }
-}
-
-
-void MeshClipper::set_limiting_plane(const ClippingPlane& plane)
-{
-    if (m_limiting_plane != plane) {
-        m_limiting_plane = plane;
-        m_triangles_valid = false;
-    }
-}
-
-
-
-void MeshClipper::set_mesh(const TriangleMesh& mesh)
-{
-    if (m_mesh != &mesh) {
-        m_mesh = &mesh;
-        m_triangles_valid = false;
-        m_triangles2d.resize(0);
-    }
-}
-
-void MeshClipper::set_negative_mesh(const TriangleMesh& mesh)
-{
-    if (m_negative_mesh != &mesh) {
-        m_negative_mesh = &mesh;
-        m_triangles_valid = false;
-        m_triangles2d.resize(0);
-    }
-}
-
-
-
-void MeshClipper::set_transformation(const Geometry::Transformation& trafo)
-{
-    if (! m_trafo.get_matrix().isApprox(trafo.get_matrix())) {
-        m_trafo = trafo;
-        m_triangles_valid = false;
-        m_triangles2d.resize(0);
-    }
-}
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-void MeshClipper::render_cut(const ColorRGBA& color)
-#else
-void MeshClipper::render_cut()
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-{
-    if (! m_triangles_valid)
-        recalculate_triangles();
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    if (m_model.vertices_count() == 0 || m_model.indices_count() == 0)
-        return;
-
-    GLShaderProgram* curr_shader = wxGetApp().get_current_shader();
-    if (curr_shader != nullptr)
-        curr_shader->stop_using();
-
-    GLShaderProgram* shader = wxGetApp().get_shader("flat");
-    if (shader != nullptr) {
-        shader->start_using();
-#if ENABLE_GL_SHADERS_ATTRIBUTES
-        const Camera& camera = wxGetApp().plater()->get_camera();
-        shader->set_uniform("view_model_matrix", camera.get_view_matrix());
-        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
-#endif // ENABLE_GL_SHADERS_ATTRIBUTES
-        m_model.set_color(color);
-        m_model.render();
-        shader->stop_using();
-    }
-
-    if (curr_shader != nullptr)
-        curr_shader->start_using();
-#else
-    if (m_vertex_array.has_VBOs())
-        m_vertex_array.render();
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-}
-
-
-
-void MeshClipper::recalculate_triangles()
-{
-    const Transform3f& instance_matrix_no_translation_no_scaling = m_trafo.get_matrix(true,false,true).cast<float>();
-    // Calculate clipping plane normal in mesh coordinates.
-    const Vec3f up_noscale = instance_matrix_no_translation_no_scaling.inverse() * m_plane.get_normal().cast<float>();
-    const Vec3d up = up_noscale.cast<double>().cwiseProduct(m_trafo.get_scaling_factor());
-    // Calculate distance from mesh origin to the clipping plane (in mesh coordinates).
-    const float height_mesh = m_plane.distance(m_trafo.get_offset()) * (up_noscale.norm()/up.norm());
-
-    // Now do the cutting
-    MeshSlicingParams slicing_params;
-    slicing_params.trafo.rotate(Eigen::Quaternion<double, Eigen::DontAlign>::FromTwoVectors(up, Vec3d::UnitZ()));
-
-    ExPolygons expolys = union_ex(slice_mesh(m_mesh->its, height_mesh, slicing_params));
-
-    if (m_negative_mesh && !m_negative_mesh->empty()) {
-        const ExPolygons neg_expolys = union_ex(slice_mesh(m_negative_mesh->its, height_mesh, slicing_params));
-        expolys = diff_ex(expolys, neg_expolys);
-    }
-
-    // Triangulate and rotate the cut into world coords:
-    Eigen::Quaterniond q;
-    q.setFromTwoVectors(Vec3d::UnitZ(), up);
-    Transform3d tr = Transform3d::Identity();
-    tr.rotate(q);
-    tr = m_trafo.get_matrix() * tr;
-
-    if (m_limiting_plane != ClippingPlane::ClipsNothing())
-    {
-        // Now remove whatever ended up below the limiting plane (e.g. sinking objects).
-        // First transform the limiting plane from world to mesh coords.
-        // Note that inverse of tr transforms the plane from world to horizontal.
-        const Vec3d normal_old = m_limiting_plane.get_normal().normalized();
-        const Vec3d normal_new = (tr.matrix().block<3,3>(0,0).transpose() * normal_old).normalized();
-
-        // normal_new should now be the plane normal in mesh coords. To find the offset,
-        // transform a point and set offset so it belongs to the transformed plane.
-        Vec3d pt = Vec3d::Zero();
-        const double plane_offset = m_limiting_plane.get_data()[3];
-        if (std::abs(normal_old.z()) > 0.5) // normal is normalized, at least one of the coords if larger than sqrt(3)/3 = 0.57
-            pt.z() = - plane_offset / normal_old.z();
-        else if (std::abs(normal_old.y()) > 0.5)
-            pt.y() = - plane_offset / normal_old.y();
-        else
-            pt.x() = - plane_offset / normal_old.x();
-        pt = tr.inverse() * pt;
-        const double offset = -(normal_new.dot(pt));
-
-        if (std::abs(normal_old.dot(m_plane.get_normal().normalized())) > 0.99) {
-            // The cuts are parallel, show all or nothing.
-            if (normal_old.dot(m_plane.get_normal().normalized()) < 0.0 && offset < height_mesh)
-                expolys.clear();
-        } else {
-            // The cut is a horizontal plane defined by z=height_mesh.
-            // ax+by+e=0 is the line of intersection with the limiting plane.
-            // Normalized so a^2 + b^2 = 1.
-            const double len = std::hypot(normal_new.x(), normal_new.y());
-            if (len == 0.)
-                return;
-            const double a = normal_new.x() / len;
-            const double b = normal_new.y() / len;
-            const double e = (normal_new.z() * height_mesh + offset) / len;
-
-            // We need a half-plane to limit the cut. Get angle of the intersecting line.
-            double angle = (b != 0.0) ? std::atan(-a / b) : ((a < 0.0) ? -0.5 * M_PI : 0.5 * M_PI);
-            if (b > 0) // select correct half-plane
-                angle += M_PI;
-
-            // We'll take a big rectangle above x-axis and rotate and translate
-            // it so it lies on our line. This will be the figure to subtract
-            // from the cut. The coordinates must not overflow after the transform,
-            // make the rectangle a bit smaller.
-            const coord_t size = (std::numeric_limits<coord_t>::max() - scale_(std::max(std::abs(e*a), std::abs(e*b)))) / 4;
-            Polygons ep {Polygon({Point(-size, 0), Point(size, 0), Point(size, 2*size), Point(-size, 2*size)})};
-            ep.front().rotate(angle);
-            ep.front().translate(scale_(-e * a), scale_(-e * b));
-            expolys = diff_ex(expolys, ep);
-        }
-    }
-
-    m_triangles2d = triangulate_expolygons_2f(expolys, m_trafo.get_matrix().matrix().determinant() < 0.);
-
-    tr.pretranslate(0.001 * m_plane.get_normal().normalized()); // to avoid z-fighting
-
-#if ENABLE_LEGACY_OPENGL_REMOVAL
-    m_model.reset();
-
-    GLModel::Geometry init_data;
-    init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };
-    init_data.reserve_vertices(m_triangles2d.size());
-    init_data.reserve_indices(m_triangles2d.size());
-
-    // vertices + indices
-    for (auto it = m_triangles2d.cbegin(); it != m_triangles2d.cend(); it = it + 3) {
-        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 0)).x(), (*(it + 0)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());
-        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 1)).x(), (*(it + 1)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());
-        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 2)).x(), (*(it + 2)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());
-        const size_t idx = it - m_triangles2d.cbegin();
-        init_data.add_triangle((unsigned int)idx, (unsigned int)idx + 1, (unsigned int)idx + 2);
-    }
-
-    if (!init_data.is_empty())
-        m_model.init_from(std::move(init_data));
-#else
-    m_vertex_array.release_geometry();
-    for (auto it=m_triangles2d.cbegin(); it != m_triangles2d.cend(); it=it+3) {
-        m_vertex_array.push_geometry(tr * Vec3d((*(it+0))(0), (*(it+0))(1), height_mesh), up);
-        m_vertex_array.push_geometry(tr * Vec3d((*(it+1))(0), (*(it+1))(1), height_mesh), up);
-        m_vertex_array.push_geometry(tr * Vec3d((*(it+2))(0), (*(it+2))(1), height_mesh), up);
-        const size_t idx = it - m_triangles2d.cbegin();
-        m_vertex_array.push_triangle(idx, idx+1, idx+2);
-    }
-    m_vertex_array.finalize_geometry(true);
-#endif // ENABLE_LEGACY_OPENGL_REMOVAL
-
-    m_triangles_valid = true;
-}
-
-
-Vec3f MeshRaycaster::get_triangle_normal(size_t facet_idx) const
-{
-    return m_normals[facet_idx];
-}
-
-void MeshRaycaster::line_from_mouse_pos(const Vec2d& mouse_pos, const Transform3d& trafo, const Camera& camera,
-                                        Vec3d& point, Vec3d& direction) const
-{
-    Matrix4d modelview = camera.get_view_matrix().matrix();
-    Matrix4d projection= camera.get_projection_matrix().matrix();
-    Vec4i viewport(camera.get_viewport().data());
-
-    Vec3d pt1;
-    Vec3d pt2;
-    igl::unproject(Vec3d(mouse_pos(0), viewport[3] - mouse_pos(1), 0.),
-                   modelview, projection, viewport, pt1);
-    igl::unproject(Vec3d(mouse_pos(0), viewport[3] - mouse_pos(1), 1.),
-                   modelview, projection, viewport, pt2);
-
-    Transform3d inv = trafo.inverse();
-    pt1 = inv * pt1;
-    pt2 = inv * pt2;
-
-    point = pt1;
-    direction = pt2-pt1;
-}
-
-
-bool MeshRaycaster::unproject_on_mesh(const Vec2d& mouse_pos, const Transform3d& trafo, const Camera& camera,
-                                      Vec3f& position, Vec3f& normal, const ClippingPlane* clipping_plane,
-                                      size_t* facet_idx) const
-{
-    Vec3d point;
-    Vec3d direction;
-    line_from_mouse_pos(mouse_pos, trafo, camera, point, direction);
-
-    std::vector<sla::IndexedMesh::hit_result> hits = m_emesh.query_ray_hits(point, direction);
-
-    if (hits.empty())
-        return false; // no intersection found
-
-    unsigned i = 0;
-
-    // Remove points that are obscured or cut by the clipping plane.
-    // Also, remove anything below the bed (sinking objects).
-    for (i=0; i<hits.size(); ++i) {
-        Vec3d transformed_hit = trafo * hits[i].position();
-        if (transformed_hit.z() >= SINKING_Z_THRESHOLD &&
-            (! clipping_plane || ! clipping_plane->is_point_clipped(transformed_hit)))
-            break;
-    }
-
-    if (i==hits.size() || (hits.size()-i) % 2 != 0) {
-        // All hits are either clipped, or there is an odd number of unclipped
-        // hits - meaning the nearest must be from inside the mesh.
-        return false;
-    }
-
-    // Now stuff the points in the provided vector and calculate normals if asked about them:
-    position = hits[i].position().cast<float>();
-    normal = hits[i].normal().cast<float>();
-
-    if (facet_idx)
-        *facet_idx = hits[i].face();
-
-    return true;
-}
-
-
-std::vector<unsigned> MeshRaycaster::get_unobscured_idxs(const Geometry::Transformation& trafo, const Camera& camera, const std::vector<Vec3f>& points,
-                                                       const ClippingPlane* clipping_plane) const
-{
-    std::vector<unsigned> out;
-
-    const Transform3d& instance_matrix_no_translation_no_scaling = trafo.get_matrix(true,false,true);
-    Vec3d direction_to_camera = -camera.get_dir_forward();
-    Vec3d direction_to_camera_mesh = (instance_matrix_no_translation_no_scaling.inverse() * direction_to_camera).normalized().eval();
-    direction_to_camera_mesh = direction_to_camera_mesh.cwiseProduct(trafo.get_scaling_factor());
-    const Transform3d inverse_trafo = trafo.get_matrix().inverse();
-
-    for (size_t i=0; i<points.size(); ++i) {
-        const Vec3f& pt = points[i];
-        if (clipping_plane && clipping_plane->is_point_clipped(pt.cast<double>()))
-            continue;
-
-        bool is_obscured = false;
-        // Cast a ray in the direction of the camera and look for intersection with the mesh:
-        std::vector<sla::IndexedMesh::hit_result> hits;
-        // Offset the start of the ray by EPSILON to account for numerical inaccuracies.
-        hits = m_emesh.query_ray_hits((inverse_trafo * pt.cast<double>() + direction_to_camera_mesh * EPSILON),
-                                      direction_to_camera_mesh);
-
-        if (! hits.empty()) {
-            // If the closest hit facet normal points in the same direction as the ray,
-            // we are looking through the mesh and should therefore discard the point:
-            if (hits.front().normal().dot(direction_to_camera_mesh.cast<double>()) > 0)
-                is_obscured = true;
-
-            // Eradicate all hits that the caller wants to ignore
-            for (unsigned j=0; j<hits.size(); ++j) {
-                if (clipping_plane && clipping_plane->is_point_clipped(trafo.get_matrix() * hits[j].position())) {
-                    hits.erase(hits.begin()+j);
-                    --j;
-                }
-            }
-
-            // FIXME: the intersection could in theory be behind the camera, but as of now we only have camera direction.
-            // Also, the threshold is in mesh coordinates, not in actual dimensions.
-            if (! hits.empty())
-                is_obscured = true;
-        }
-        if (! is_obscured)
-            out.push_back(i);
-    }
-    return out;
-}
-
-
-Vec3f MeshRaycaster::get_closest_point(const Vec3f& point, Vec3f* normal) const
-{
-    int idx = 0;
-    Vec3d closest_point;
-    m_emesh.squared_distance(point.cast<double>(), idx, closest_point);
-    if (normal)
-        *normal = m_normals[idx];
-
-    return closest_point.cast<float>();
-}
-
-int MeshRaycaster::get_closest_facet(const Vec3f &point) const
-{
-    int   facet_idx = 0;
-    Vec3d closest_point;
-    m_emesh.squared_distance(point.cast<double>(), facet_idx, closest_point);
-    return facet_idx;
-}
-
-} // namespace GUI
-} // namespace Slic3r
+#include "MeshUtils.hpp"

+

+#include "libslic3r/Tesselate.hpp"

+#include "libslic3r/TriangleMesh.hpp"

+#include "libslic3r/TriangleMeshSlicer.hpp"

+#include "libslic3r/ClipperUtils.hpp"

+#include "libslic3r/Model.hpp"

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+#include "slic3r/GUI/GUI_App.hpp"

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+#include "slic3r/GUI/Camera.hpp"

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+#include "slic3r/GUI/Plater.hpp"

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+

+#include <GL/glew.h>

+

+#include <igl/unproject.h>

+

+

+namespace Slic3r {

+namespace GUI {

+

+void MeshClipper::set_plane(const ClippingPlane& plane)

+{

+    if (m_plane != plane) {

+        m_plane = plane;

+        m_triangles_valid = false;

+    }

+}

+

+

+void MeshClipper::set_limiting_plane(const ClippingPlane& plane)

+{

+    if (m_limiting_plane != plane) {

+        m_limiting_plane = plane;

+        m_triangles_valid = false;

+    }

+}

+

+

+

+void MeshClipper::set_mesh(const TriangleMesh& mesh)

+{

+    if (m_mesh != &mesh) {

+        m_mesh = &mesh;

+        m_triangles_valid = false;

+        m_triangles2d.resize(0);

+    }

+}

+

+void MeshClipper::set_negative_mesh(const TriangleMesh& mesh)

+{

+    if (m_negative_mesh != &mesh) {

+        m_negative_mesh = &mesh;

+        m_triangles_valid = false;

+        m_triangles2d.resize(0);

+    }

+}

+

+

+

+void MeshClipper::set_transformation(const Geometry::Transformation& trafo)

+{

+    if (! m_trafo.get_matrix().isApprox(trafo.get_matrix())) {

+        m_trafo = trafo;

+        m_triangles_valid = false;

+        m_triangles2d.resize(0);

+    }

+}

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+void MeshClipper::render_cut(const ColorRGBA& color)

+#else

+void MeshClipper::render_cut()

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+{

+    if (! m_triangles_valid)

+        recalculate_triangles();

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    if (m_model.vertices_count() == 0 || m_model.indices_count() == 0)

+        return;

+

+    GLShaderProgram* curr_shader = wxGetApp().get_current_shader();

+    if (curr_shader != nullptr)

+        curr_shader->stop_using();

+

+    GLShaderProgram* shader = wxGetApp().get_shader("flat");

+    if (shader != nullptr) {

+        shader->start_using();

+#if ENABLE_GL_SHADERS_ATTRIBUTES

+        const Camera& camera = wxGetApp().plater()->get_camera();

+        shader->set_uniform("view_model_matrix", camera.get_view_matrix());

+        shader->set_uniform("projection_matrix", camera.get_projection_matrix());

+#endif // ENABLE_GL_SHADERS_ATTRIBUTES

+        m_model.set_color(color);

+        m_model.render();

+        shader->stop_using();

+    }

+

+    if (curr_shader != nullptr)

+        curr_shader->start_using();

+#else

+    if (m_vertex_array.has_VBOs())

+        m_vertex_array.render();

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+}

+

+

+

+void MeshClipper::recalculate_triangles()

+{

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3f instance_matrix_no_translation_no_scaling = m_trafo.get_rotation_matrix().cast<float>();

+#else

+    const Transform3f& instance_matrix_no_translation_no_scaling = m_trafo.get_matrix(true,false,true).cast<float>();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    // Calculate clipping plane normal in mesh coordinates.

+    const Vec3f up_noscale = instance_matrix_no_translation_no_scaling.inverse() * m_plane.get_normal().cast<float>();

+    const Vec3d up = up_noscale.cast<double>().cwiseProduct(m_trafo.get_scaling_factor());

+    // Calculate distance from mesh origin to the clipping plane (in mesh coordinates).

+    const float height_mesh = m_plane.distance(m_trafo.get_offset()) * (up_noscale.norm()/up.norm());

+

+    // Now do the cutting

+    MeshSlicingParams slicing_params;

+    slicing_params.trafo.rotate(Eigen::Quaternion<double, Eigen::DontAlign>::FromTwoVectors(up, Vec3d::UnitZ()));

+

+    ExPolygons expolys = union_ex(slice_mesh(m_mesh->its, height_mesh, slicing_params));

+

+    if (m_negative_mesh && !m_negative_mesh->empty()) {

+        const ExPolygons neg_expolys = union_ex(slice_mesh(m_negative_mesh->its, height_mesh, slicing_params));

+        expolys = diff_ex(expolys, neg_expolys);

+    }

+

+    // Triangulate and rotate the cut into world coords:

+    Eigen::Quaterniond q;

+    q.setFromTwoVectors(Vec3d::UnitZ(), up);

+    Transform3d tr = Transform3d::Identity();

+    tr.rotate(q);

+    tr = m_trafo.get_matrix() * tr;

+

+    if (m_limiting_plane != ClippingPlane::ClipsNothing())

+    {

+        // Now remove whatever ended up below the limiting plane (e.g. sinking objects).

+        // First transform the limiting plane from world to mesh coords.

+        // Note that inverse of tr transforms the plane from world to horizontal.

+        const Vec3d normal_old = m_limiting_plane.get_normal().normalized();

+        const Vec3d normal_new = (tr.matrix().block<3,3>(0,0).transpose() * normal_old).normalized();

+

+        // normal_new should now be the plane normal in mesh coords. To find the offset,

+        // transform a point and set offset so it belongs to the transformed plane.

+        Vec3d pt = Vec3d::Zero();

+        const double plane_offset = m_limiting_plane.get_data()[3];

+        if (std::abs(normal_old.z()) > 0.5) // normal is normalized, at least one of the coords if larger than sqrt(3)/3 = 0.57

+            pt.z() = - plane_offset / normal_old.z();

+        else if (std::abs(normal_old.y()) > 0.5)

+            pt.y() = - plane_offset / normal_old.y();

+        else

+            pt.x() = - plane_offset / normal_old.x();

+        pt = tr.inverse() * pt;

+        const double offset = -(normal_new.dot(pt));

+

+        if (std::abs(normal_old.dot(m_plane.get_normal().normalized())) > 0.99) {

+            // The cuts are parallel, show all or nothing.

+            if (normal_old.dot(m_plane.get_normal().normalized()) < 0.0 && offset < height_mesh)

+                expolys.clear();

+        } else {

+            // The cut is a horizontal plane defined by z=height_mesh.

+            // ax+by+e=0 is the line of intersection with the limiting plane.

+            // Normalized so a^2 + b^2 = 1.

+            const double len = std::hypot(normal_new.x(), normal_new.y());

+            if (len == 0.)

+                return;

+            const double a = normal_new.x() / len;

+            const double b = normal_new.y() / len;

+            const double e = (normal_new.z() * height_mesh + offset) / len;

+

+            // We need a half-plane to limit the cut. Get angle of the intersecting line.

+            double angle = (b != 0.0) ? std::atan(-a / b) : ((a < 0.0) ? -0.5 * M_PI : 0.5 * M_PI);

+            if (b > 0) // select correct half-plane

+                angle += M_PI;

+

+            // We'll take a big rectangle above x-axis and rotate and translate

+            // it so it lies on our line. This will be the figure to subtract

+            // from the cut. The coordinates must not overflow after the transform,

+            // make the rectangle a bit smaller.

+            const coord_t size = (std::numeric_limits<coord_t>::max() - scale_(std::max(std::abs(e*a), std::abs(e*b)))) / 4;

+            Polygons ep {Polygon({Point(-size, 0), Point(size, 0), Point(size, 2*size), Point(-size, 2*size)})};

+            ep.front().rotate(angle);

+            ep.front().translate(scale_(-e * a), scale_(-e * b));

+            expolys = diff_ex(expolys, ep);

+        }

+    }

+

+    m_triangles2d = triangulate_expolygons_2f(expolys, m_trafo.get_matrix().matrix().determinant() < 0.);

+

+    tr.pretranslate(0.001 * m_plane.get_normal().normalized()); // to avoid z-fighting

+

+#if ENABLE_LEGACY_OPENGL_REMOVAL

+    m_model.reset();

+

+    GLModel::Geometry init_data;

+    init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3 };

+    init_data.reserve_vertices(m_triangles2d.size());

+    init_data.reserve_indices(m_triangles2d.size());

+

+    // vertices + indices

+    for (auto it = m_triangles2d.cbegin(); it != m_triangles2d.cend(); it = it + 3) {

+        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 0)).x(), (*(it + 0)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());

+        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 1)).x(), (*(it + 1)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());

+        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 2)).x(), (*(it + 2)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());

+        const size_t idx = it - m_triangles2d.cbegin();

+        init_data.add_triangle((unsigned int)idx, (unsigned int)idx + 1, (unsigned int)idx + 2);

+    }

+

+    if (!init_data.is_empty())

+        m_model.init_from(std::move(init_data));

+#else

+    m_vertex_array.release_geometry();

+    for (auto it=m_triangles2d.cbegin(); it != m_triangles2d.cend(); it=it+3) {

+        m_vertex_array.push_geometry(tr * Vec3d((*(it+0))(0), (*(it+0))(1), height_mesh), up);

+        m_vertex_array.push_geometry(tr * Vec3d((*(it+1))(0), (*(it+1))(1), height_mesh), up);

+        m_vertex_array.push_geometry(tr * Vec3d((*(it+2))(0), (*(it+2))(1), height_mesh), up);

+        const size_t idx = it - m_triangles2d.cbegin();

+        m_vertex_array.push_triangle(idx, idx+1, idx+2);

+    }

+    m_vertex_array.finalize_geometry(true);

+#endif // ENABLE_LEGACY_OPENGL_REMOVAL

+

+    m_triangles_valid = true;

+}

+

+

+Vec3f MeshRaycaster::get_triangle_normal(size_t facet_idx) const

+{

+    return m_normals[facet_idx];

+}

+

+void MeshRaycaster::line_from_mouse_pos(const Vec2d& mouse_pos, const Transform3d& trafo, const Camera& camera,

+                                        Vec3d& point, Vec3d& direction) const

+{

+    Matrix4d modelview = camera.get_view_matrix().matrix();

+    Matrix4d projection= camera.get_projection_matrix().matrix();

+    Vec4i viewport(camera.get_viewport().data());

+

+    Vec3d pt1;

+    Vec3d pt2;

+    igl::unproject(Vec3d(mouse_pos(0), viewport[3] - mouse_pos(1), 0.),

+                   modelview, projection, viewport, pt1);

+    igl::unproject(Vec3d(mouse_pos(0), viewport[3] - mouse_pos(1), 1.),

+                   modelview, projection, viewport, pt2);

+

+    Transform3d inv = trafo.inverse();

+    pt1 = inv * pt1;

+    pt2 = inv * pt2;

+

+    point = pt1;

+    direction = pt2-pt1;

+}

+

+

+bool MeshRaycaster::unproject_on_mesh(const Vec2d& mouse_pos, const Transform3d& trafo, const Camera& camera,

+                                      Vec3f& position, Vec3f& normal, const ClippingPlane* clipping_plane,

+                                      size_t* facet_idx) const

+{

+    Vec3d point;

+    Vec3d direction;

+    line_from_mouse_pos(mouse_pos, trafo, camera, point, direction);

+

+    std::vector<sla::IndexedMesh::hit_result> hits = m_emesh.query_ray_hits(point, direction);

+

+    if (hits.empty())

+        return false; // no intersection found

+

+    unsigned i = 0;

+

+    // Remove points that are obscured or cut by the clipping plane.

+    // Also, remove anything below the bed (sinking objects).

+    for (i=0; i<hits.size(); ++i) {

+        Vec3d transformed_hit = trafo * hits[i].position();

+        if (transformed_hit.z() >= SINKING_Z_THRESHOLD &&

+            (! clipping_plane || ! clipping_plane->is_point_clipped(transformed_hit)))

+            break;

+    }

+

+    if (i==hits.size() || (hits.size()-i) % 2 != 0) {

+        // All hits are either clipped, or there is an odd number of unclipped

+        // hits - meaning the nearest must be from inside the mesh.

+        return false;

+    }

+

+    // Now stuff the points in the provided vector and calculate normals if asked about them:

+    position = hits[i].position().cast<float>();

+    normal = hits[i].normal().cast<float>();

+

+    if (facet_idx)

+        *facet_idx = hits[i].face();

+

+    return true;

+}

+

+

+std::vector<unsigned> MeshRaycaster::get_unobscured_idxs(const Geometry::Transformation& trafo, const Camera& camera, const std::vector<Vec3f>& points,

+                                                       const ClippingPlane* clipping_plane) const

+{

+    std::vector<unsigned> out;

+

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+    const Transform3d instance_matrix_no_translation_no_scaling = trafo.get_rotation_matrix();

+#else

+    const Transform3d& instance_matrix_no_translation_no_scaling = trafo.get_matrix(true,false,true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

+    Vec3d direction_to_camera = -camera.get_dir_forward();

+    Vec3d direction_to_camera_mesh = (instance_matrix_no_translation_no_scaling.inverse() * direction_to_camera).normalized().eval();

+    direction_to_camera_mesh = direction_to_camera_mesh.cwiseProduct(trafo.get_scaling_factor());

+    const Transform3d inverse_trafo = trafo.get_matrix().inverse();

+

+    for (size_t i=0; i<points.size(); ++i) {

+        const Vec3f& pt = points[i];

+        if (clipping_plane && clipping_plane->is_point_clipped(pt.cast<double>()))

+            continue;

+

+        bool is_obscured = false;

+        // Cast a ray in the direction of the camera and look for intersection with the mesh:

+        std::vector<sla::IndexedMesh::hit_result> hits;

+        // Offset the start of the ray by EPSILON to account for numerical inaccuracies.

+        hits = m_emesh.query_ray_hits((inverse_trafo * pt.cast<double>() + direction_to_camera_mesh * EPSILON),

+                                      direction_to_camera_mesh);

+

+        if (! hits.empty()) {

+            // If the closest hit facet normal points in the same direction as the ray,

+            // we are looking through the mesh and should therefore discard the point:

+            if (hits.front().normal().dot(direction_to_camera_mesh.cast<double>()) > 0)

+                is_obscured = true;

+

+            // Eradicate all hits that the caller wants to ignore

+            for (unsigned j=0; j<hits.size(); ++j) {

+                if (clipping_plane && clipping_plane->is_point_clipped(trafo.get_matrix() * hits[j].position())) {

+                    hits.erase(hits.begin()+j);

+                    --j;

+                }

+            }

+

+            // FIXME: the intersection could in theory be behind the camera, but as of now we only have camera direction.

+            // Also, the threshold is in mesh coordinates, not in actual dimensions.

+            if (! hits.empty())

+                is_obscured = true;

+        }

+        if (! is_obscured)

+            out.push_back(i);

+    }

+    return out;

+}

+

+

+Vec3f MeshRaycaster::get_closest_point(const Vec3f& point, Vec3f* normal) const

+{

+    int idx = 0;

+    Vec3d closest_point;

+    m_emesh.squared_distance(point.cast<double>(), idx, closest_point);

+    if (normal)

+        *normal = m_normals[idx];

+

+    return closest_point.cast<float>();

+}

+

+int MeshRaycaster::get_closest_facet(const Vec3f &point) const

+{

+    int   facet_idx = 0;

+    Vec3d closest_point;

+    m_emesh.squared_distance(point.cast<double>(), facet_idx, closest_point);

+    return facet_idx;

+}

+

+} // namespace GUI

+} // namespace Slic3r

diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index cd9f221b4..0c1985733 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3492,7 +3492,11 @@ bool Plater::priv::replace_volume_with_stl(int object_idx, int volume_idx, const
     new_volume->set_type(old_volume->type());
     new_volume->set_material_id(old_volume->material_id());
     new_volume->set_transformation(old_volume->get_transformation());
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+    new_volume->translate(new_volume->get_transformation().get_matrix_no_offset() * (new_volume->source.mesh_offset - old_volume->source.mesh_offset));
+#else
     new_volume->translate(new_volume->get_transformation().get_matrix(true) * (new_volume->source.mesh_offset - old_volume->source.mesh_offset));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
     assert(!old_volume->source.is_converted_from_inches || !old_volume->source.is_converted_from_meters);
     if (old_volume->source.is_converted_from_inches)
         new_volume->convert_from_imperial_units();
@@ -3847,10 +3851,16 @@ void Plater::priv::reload_from_disk()
                 new_volume->config.apply(old_volume->config);
                 new_volume->set_type(old_volume->type());
                 new_volume->set_material_id(old_volume->material_id());
+#if ENABLE_TRANSFORMATIONS_BY_MATRICES
+                new_volume->set_transformation(Geometry::assemble_transform(old_volume->source.transform.get_offset()) *
+                    old_volume->get_transformation().get_matrix_no_offset() * old_volume->source.transform.get_matrix_no_offset());
+                new_volume->translate(new_volume->get_transformation().get_matrix_no_offset() * (new_volume->source.mesh_offset - old_volume->source.mesh_offset));
+#else
                 new_volume->set_transformation(Geometry::assemble_transform(old_volume->source.transform.get_offset()) *
                                                old_volume->get_transformation().get_matrix(true) *
                                                old_volume->source.transform.get_matrix(true));
                 new_volume->translate(new_volume->get_transformation().get_matrix(true) * (new_volume->source.mesh_offset - old_volume->source.mesh_offset));
+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES
                 new_volume->source.object_idx = old_volume->source.object_idx;
                 new_volume->source.volume_idx = old_volume->source.volume_idx;
                 assert(!old_volume->source.is_converted_from_inches || !old_volume->source.is_converted_from_meters);
diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index 3bb2db1ac..45d80a145 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -723,7 +723,11 @@ const BoundingBoxf3& Selection::get_unscaled_instance_bounding_box() const
                 const GLVolume& volume = *(*m_volumes)[i];

                 if (volume.is_modifier)

                     continue;

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                Transform3d trafo = volume.get_instance_transformation().get_matrix_no_scaling_factor() * volume.get_volume_transformation().get_matrix();

+#else

                 Transform3d trafo = volume.get_instance_transformation().get_matrix(false, false, true, false) * volume.get_volume_transformation().get_matrix();

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

                 trafo.translation().z() += volume.get_sla_shift_z();

                 (*bbox)->merge(volume.transformed_convex_hull_bounding_box(trafo));

             }

@@ -1486,8 +1490,14 @@ void Selection::render(float scale_factor)
     }

     else if (coordinates_type == ECoordinatesType::Local && is_single_volume_or_modifier()) {

         const GLVolume& v = *get_volume(*get_volume_idxs().begin());

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        box = v.transformed_convex_hull_bounding_box(

+            v.get_instance_transformation().get_scaling_factor_matrix() * v.get_volume_transformation().get_scaling_factor_matrix());

+        trafo = v.get_instance_transformation().get_matrix_no_scaling_factor() * v.get_volume_transformation().get_matrix_no_scaling_factor();

+#else

         box = v.transformed_convex_hull_bounding_box(v.get_instance_transformation().get_matrix(true, true, false, true) * v.get_volume_transformation().get_matrix(true, true, false, true));

         trafo = v.get_instance_transformation().get_matrix(false, false, true, false) * v.get_volume_transformation().get_matrix(false, false, true, false);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

     }

     else {

         const Selection::IndicesList& ids = get_volume_idxs();

@@ -1495,8 +1505,13 @@ void Selection::render(float scale_factor)
             const GLVolume& v = *get_volume(id);

             box.merge(v.transformed_convex_hull_bounding_box(v.get_volume_transformation().get_matrix()));

         }

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        box = box.transformed(get_volume(*ids.begin())->get_instance_transformation().get_scaling_factor_matrix());

+        trafo = get_volume(*ids.begin())->get_instance_transformation().get_matrix_no_scaling_factor();

+#else

         box = box.transformed(get_volume(*ids.begin())->get_instance_transformation().get_matrix(true, true, false, true));

         trafo = get_volume(*ids.begin())->get_instance_transformation().get_matrix(false, false, true, false);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

     }

 

     render_bounding_box(box, trafo, ColorRGB::WHITE());

@@ -1516,11 +1531,7 @@ void Selection::render_center(bool gizmo_is_dragging)
         return;

 

 #if ENABLE_LEGACY_OPENGL_REMOVAL

-#if ENABLE_GL_SHADERS_ATTRIBUTES

-    GLShaderProgram* shader = wxGetApp().get_shader("flat_attr");

-#else

     GLShaderProgram* shader = wxGetApp().get_shader("flat");

-#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     if (shader == nullptr)

         return;

 

@@ -1565,11 +1576,7 @@ void Selection::render_sidebar_hints(const std::string& sidebar_field)
         return;

 

 #if ENABLE_LEGACY_OPENGL_REMOVAL

-#if ENABLE_GL_SHADERS_ATTRIBUTES

-    GLShaderProgram* shader = wxGetApp().get_shader(boost::starts_with(sidebar_field, "layer") ? "flat_attr" : "gouraud_light_attr");

-#else

     GLShaderProgram* shader = wxGetApp().get_shader(boost::starts_with(sidebar_field, "layer") ? "flat" : "gouraud_light");

-#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     if (shader == nullptr)

         return;

 

@@ -1622,7 +1629,11 @@ void Selection::render_sidebar_hints(const std::string& sidebar_field)
 #if !ENABLE_GL_SHADERS_ATTRIBUTES && !ENABLE_WORLD_COORDINATE_SHOW_AXES

             Transform3d orient_matrix = Transform3d::Identity();

 #endif // !ENABLE_GL_SHADERS_ATTRIBUTES && !ENABLE_WORLD_COORDINATE_SHOW_AXES

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+            orient_matrix = (*m_volumes)[*m_list.begin()]->get_instance_transformation().get_rotation_matrix();

+#else

             orient_matrix = (*m_volumes)[*m_list.begin()]->get_instance_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

 #if ENABLE_WORLD_COORDINATE_SHOW_AXES

             axes_center = (*m_volumes)[*m_list.begin()]->get_instance_offset();

 #else

@@ -1667,13 +1678,21 @@ void Selection::render_sidebar_hints(const std::string& sidebar_field)
 #endif // !ENABLE_GL_SHADERS_ATTRIBUTES && !ENABLE_WORLD_COORDINATE_SHOW_AXES

                 if (wxGetApp().obj_manipul()->is_local_coordinates()) {

                     const GLVolume* v = (*m_volumes)[*m_list.begin()];

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    orient_matrix = v->get_instance_transformation().get_rotation_matrix() * v->get_volume_transformation().get_rotation_matrix();

+#else

                     orient_matrix = v->get_instance_transformation().get_matrix(true, false, true, true) * v->get_volume_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

 #if ENABLE_WORLD_COORDINATE_SHOW_AXES

                     axes_center = (*m_volumes)[*m_list.begin()]->world_matrix().translation();

 #endif // ENABLE_WORLD_COORDINATE_SHOW_AXES

                 }

                 else {

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                    orient_matrix = (*m_volumes)[*m_list.begin()]->get_instance_transformation().get_rotation_matrix();

+#else

                     orient_matrix = (*m_volumes)[*m_list.begin()]->get_instance_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

 #if ENABLE_WORLD_COORDINATE_SHOW_AXES

                     axes_center = (*m_volumes)[*m_list.begin()]->get_instance_offset();

                 }

@@ -1700,7 +1719,11 @@ void Selection::render_sidebar_hints(const std::string& sidebar_field)
         else {

 #if ENABLE_GL_SHADERS_ATTRIBUTES || ENABLE_WORLD_COORDINATE_SHOW_AXES

             if (requires_local_axes())

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+                orient_matrix = (*m_volumes)[*m_list.begin()]->get_instance_transformation().get_rotation_matrix();

+#else

                 orient_matrix = (*m_volumes)[*m_list.begin()]->get_instance_transformation().get_matrix(true, false, true, true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

 #else

             glsafe(::glTranslated(center.x(), center.y(), center.z()));

             if (requires_local_axes()) {

@@ -2357,11 +2380,7 @@ void Selection::render_bounding_box(const BoundingBoxf3 & box, float* color) con
 

     glsafe(::glLineWidth(2.0f * m_scale_factor));

 

-#if ENABLE_GL_SHADERS_ATTRIBUTES

-    GLShaderProgram* shader = wxGetApp().get_shader("flat_attr");

-#else

     GLShaderProgram* shader = wxGetApp().get_shader("flat");

-#endif // ENABLE_GL_SHADERS_ATTRIBUTES

     if (shader == nullptr)

         return;

 

@@ -3061,8 +3080,13 @@ void Selection::paste_volumes_from_clipboard()
     {

         ModelInstance* dst_instance = dst_object->instances[dst_inst_idx];

         BoundingBoxf3 dst_instance_bb = dst_object->instance_bounding_box(dst_inst_idx);

+#if ENABLE_TRANSFORMATIONS_BY_MATRICES

+        Transform3d src_matrix = src_object->instances[0]->get_transformation().get_matrix_no_offset();

+        Transform3d dst_matrix = dst_instance->get_transformation().get_matrix_no_offset();

+#else

         Transform3d src_matrix = src_object->instances[0]->get_transformation().get_matrix(true);

         Transform3d dst_matrix = dst_instance->get_transformation().get_matrix(true);

+#endif // ENABLE_TRANSFORMATIONS_BY_MATRICES

         bool from_same_object = (src_object->input_file == dst_object->input_file) && src_matrix.isApprox(dst_matrix);

 

         // used to keep relative position of multivolume selections when pasting from another object