1 files changed, 70 insertions, 27 deletions

diff --git a/xs/src/libslic3r/PrintObject.cpp b/xs/src/libslic3r/PrintObject.cpp
index 7882c58a8..ef2364dc4 100644
--- a/xs/src/libslic3r/PrintObject.cpp
+++ b/xs/src/libslic3r/PrintObject.cpp
@@ -112,8 +112,18 @@ bool PrintObject::reload_model_instances()
     Points copies;
     copies.reserve(m_model_object->instances.size());
     for (const ModelInstance *mi : m_model_object->instances)
+    {
+#if ENABLE_MODELINSTANCE_3D_OFFSET
+        if (mi->is_printable())
+        {
+            const Vec3d& offset = mi->get_offset();
+            copies.emplace_back(Point::new_scale(offset(0), offset(1)));
+        }
+#else
         if (mi->is_printable())
             copies.emplace_back(Point::new_scale(mi->offset(0), mi->offset(1)));
+#endif // ENABLE_MODELINSTANCE_3D_OFFSET
+    }
     return this->set_copies(copies);
 }
 
@@ -490,6 +500,7 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             steps.emplace_back(posSlice);
         } else if (
                opt_key == "support_material"
+            || opt_key == "support_material_auto"
             || opt_key == "support_material_angle"
             || opt_key == "support_material_buildplate_only"
             || opt_key == "support_material_enforce_layers"
@@ -1560,34 +1571,66 @@ end:
 
 std::vector<ExPolygons> PrintObject::_slice_region(size_t region_id, const std::vector<float> &z, bool modifier)
 {
-    std::vector<ExPolygons> layers;
+    std::vector<const ModelVolume*> volumes;
     if (region_id < this->region_volumes.size()) {
-        std::vector<int> &volumes = this->region_volumes[region_id];
-        if (! volumes.empty()) {
-            // Compose mesh.
-            //FIXME better to perform slicing over each volume separately and then to use a Boolean operation to merge them.
-            TriangleMesh mesh;
-            for (int volume_id : volumes) {
-                ModelVolume *volume = this->model_object()->volumes[volume_id];
-                if (volume->modifier == modifier)
-                    mesh.merge(volume->mesh);
-                m_print->throw_if_canceled();
-            }
-            if (mesh.stl.stats.number_of_facets > 0) {
-                // transform mesh
-                // we ignore the per-instance transformations currently and only 
-                // consider the first one
-                this->model_object()->instances.front()->transform_mesh(&mesh, true);
-                // align mesh to Z = 0 (it should be already aligned actually) and apply XY shift
-                mesh.translate(- unscale<float>(m_copies_shift(0)), - unscale<float>(m_copies_shift(1)), - float(this->model_object()->bounding_box().min(2)));
-                // perform actual slicing
-				TriangleMeshSlicer mslicer;
-				Print *print = this->print();
-				auto callback = TriangleMeshSlicer::throw_on_cancel_callback_type([print](){print->throw_if_canceled();});
-				mslicer.init(&mesh, callback);
-                mslicer.slice(z, &layers, callback);
-                m_print->throw_if_canceled();
-            }
+        for (int volume_id : this->region_volumes[region_id]) {
+            const ModelVolume *volume = this->model_object()->volumes[volume_id];
+            if (modifier ? volume->is_modifier() : volume->is_model_part())
+                volumes.emplace_back(volume);
+        }
+    }
+    return this->_slice_volumes(z, volumes);
+}
+
+std::vector<ExPolygons> PrintObject::slice_support_enforcers() const
+{
+    std::vector<const ModelVolume*> volumes;
+    for (const ModelVolume *volume : this->model_object()->volumes)
+        if (volume->is_support_enforcer())
+            volumes.emplace_back(volume);
+    std::vector<float> zs;
+    zs.reserve(this->layers().size());
+    for (const Layer *l : this->layers())
+        zs.emplace_back(l->slice_z);
+    return this->_slice_volumes(zs, volumes);
+}
+
+std::vector<ExPolygons> PrintObject::slice_support_blockers() const
+{
+    std::vector<const ModelVolume*> volumes;
+    for (const ModelVolume *volume : this->model_object()->volumes)
+        if (volume->is_support_blocker())
+            volumes.emplace_back(volume);
+    std::vector<float> zs;
+    zs.reserve(this->layers().size());
+    for (const Layer *l : this->layers())
+        zs.emplace_back(l->slice_z);
+    return this->_slice_volumes(zs, volumes);
+}
+
+std::vector<ExPolygons> PrintObject::_slice_volumes(const std::vector<float> &z, const std::vector<const ModelVolume*> &volumes) const
+{
+    std::vector<ExPolygons> layers;
+    if (! volumes.empty()) {
+        // Compose mesh.
+        //FIXME better to perform slicing over each volume separately and then to use a Boolean operation to merge them.
+        TriangleMesh mesh;
+        for (const ModelVolume *v : volumes)
+            mesh.merge(v->mesh);
+        if (mesh.stl.stats.number_of_facets > 0) {
+            // transform mesh
+            // we ignore the per-instance transformations currently and only 
+            // consider the first one
+            this->model_object()->instances.front()->transform_mesh(&mesh, true);
+            // align mesh to Z = 0 (it should be already aligned actually) and apply XY shift
+            mesh.translate(- unscale<float>(m_copies_shift(0)), - unscale<float>(m_copies_shift(1)), - float(this->model_object()->bounding_box().min(2)));
+            // perform actual slicing
+            TriangleMeshSlicer mslicer;
+            const Print *print = this->print();
+            auto callback = TriangleMeshSlicer::throw_on_cancel_callback_type([print](){print->throw_if_canceled();});
+            mslicer.init(&mesh, callback);
+            mslicer.slice(z, &layers, callback);
+            m_print->throw_if_canceled();
         }
     }
     return layers;