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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <algorithm>
#include "curves_sculpt_intern.hh"
#include "BLI_float4x4.hh"
#include "BLI_kdtree.h"
#include "BLI_rand.hh"
#include "BLI_vector.hh"
#include "PIL_time.h"
#include "DEG_depsgraph.h"
#include "BKE_attribute_math.hh"
#include "BKE_brush.h"
#include "BKE_bvhutils.h"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "BKE_curves_utils.hh"
#include "BKE_geometry_set.hh"
#include "BKE_mesh.h"
#include "BKE_mesh_runtime.h"
#include "BKE_mesh_sample.hh"
#include "BKE_modifier.h"
#include "BKE_object.h"
#include "BKE_paint.h"
#include "BKE_report.h"
#include "DNA_brush_enums.h"
#include "DNA_brush_types.h"
#include "DNA_curves_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "GEO_add_curves_on_mesh.hh"
#include "WM_api.h"
#include "DEG_depsgraph_query.h"
/**
* The code below uses a suffix naming convention to indicate the coordinate space:
* cu: Local space of the curves object that is being edited.
* su: Local space of the surface object.
* wo: World space.
* re: 2D coordinates within the region.
*/
namespace blender::ed::sculpt_paint {
using bke::CurvesGeometry;
class AddOperation : public CurvesSculptStrokeOperation {
private:
/** Used when some data should be interpolated from existing curves. */
KDTree_3d *curve_roots_kdtree_ = nullptr;
friend struct AddOperationExecutor;
public:
~AddOperation() override
{
if (curve_roots_kdtree_ != nullptr) {
BLI_kdtree_3d_free(curve_roots_kdtree_);
}
}
void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
};
/**
* Utility class that actually executes the update when the stroke is updated. That's useful
* because it avoids passing a very large number of parameters between functions.
*/
struct AddOperationExecutor {
AddOperation *self_ = nullptr;
CurvesSculptCommonContext ctx_;
Object *curves_ob_orig_ = nullptr;
Curves *curves_id_orig_ = nullptr;
CurvesGeometry *curves_orig_ = nullptr;
Object *surface_ob_eval_ = nullptr;
Mesh *surface_eval_ = nullptr;
Span<MLoopTri> surface_looptris_eval_;
VArraySpan<float2> surface_uv_map_eval_;
BVHTreeFromMesh surface_bvh_eval_;
const CurvesSculpt *curves_sculpt_ = nullptr;
const Brush *brush_ = nullptr;
const BrushCurvesSculptSettings *brush_settings_ = nullptr;
int add_amount_;
bool use_front_face_;
float brush_radius_re_;
float2 brush_pos_re_;
CurvesSurfaceTransforms transforms_;
AddOperationExecutor(const bContext &C) : ctx_(C)
{
}
void execute(AddOperation &self, const bContext &C, const StrokeExtension &stroke_extension)
{
self_ = &self;
curves_ob_orig_ = CTX_data_active_object(&C);
curves_id_orig_ = static_cast<Curves *>(curves_ob_orig_->data);
curves_orig_ = &CurvesGeometry::wrap(curves_id_orig_->geometry);
if (curves_id_orig_->surface == nullptr || curves_id_orig_->surface->type != OB_MESH) {
report_missing_surface(stroke_extension.reports);
return;
}
transforms_ = CurvesSurfaceTransforms(*curves_ob_orig_, curves_id_orig_->surface);
Object &surface_ob_orig = *curves_id_orig_->surface;
Mesh &surface_orig = *static_cast<Mesh *>(surface_ob_orig.data);
surface_ob_eval_ = DEG_get_evaluated_object(ctx_.depsgraph, &surface_ob_orig);
if (surface_ob_eval_ == nullptr) {
return;
}
surface_eval_ = BKE_object_get_evaluated_mesh(surface_ob_eval_);
curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
brush_settings_ = brush_->curves_sculpt_settings;
brush_radius_re_ = brush_radius_get(*ctx_.scene, *brush_, stroke_extension);
brush_pos_re_ = stroke_extension.mouse_position;
use_front_face_ = brush_->flag & BRUSH_FRONTFACE;
const eBrushFalloffShape falloff_shape = static_cast<eBrushFalloffShape>(
brush_->falloff_shape);
add_amount_ = std::max(0, brush_settings_->add_amount);
if (add_amount_ == 0) {
return;
}
/* Find UV map. */
VArraySpan<float2> surface_uv_map;
if (curves_id_orig_->surface_uv_map != nullptr) {
surface_uv_map = bke::mesh_attributes(surface_orig)
.lookup<float2>(curves_id_orig_->surface_uv_map, ATTR_DOMAIN_CORNER);
surface_uv_map_eval_ = bke::mesh_attributes(*surface_eval_)
.lookup<float2>(curves_id_orig_->surface_uv_map,
ATTR_DOMAIN_CORNER);
}
if (surface_uv_map.is_empty()) {
report_missing_uv_map_on_original_surface(stroke_extension.reports);
return;
}
if (surface_uv_map_eval_.is_empty()) {
report_missing_uv_map_on_evaluated_surface(stroke_extension.reports);
return;
}
const double time = PIL_check_seconds_timer() * 1000000.0;
/* Use a pointer cast to avoid overflow warnings. */
RandomNumberGenerator rng{*(uint32_t *)(&time)};
BKE_bvhtree_from_mesh_get(&surface_bvh_eval_, surface_eval_, BVHTREE_FROM_LOOPTRI, 2);
BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_eval_); });
surface_looptris_eval_ = {BKE_mesh_runtime_looptri_ensure(surface_eval_),
BKE_mesh_runtime_looptri_len(surface_eval_)};
/* Sample points on the surface using one of multiple strategies. */
Vector<float2> sampled_uvs;
if (add_amount_ == 1) {
this->sample_in_center_with_symmetry(sampled_uvs);
}
else if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
this->sample_projected_with_symmetry(rng, sampled_uvs);
}
else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
this->sample_spherical_with_symmetry(rng, sampled_uvs);
}
else {
BLI_assert_unreachable();
}
if (sampled_uvs.is_empty()) {
/* No new points have been added. */
return;
}
const Span<MLoopTri> surface_looptris_orig = {BKE_mesh_runtime_looptri_ensure(&surface_orig),
BKE_mesh_runtime_looptri_len(&surface_orig)};
/* Find normals. */
if (!CustomData_has_layer(&surface_orig.ldata, CD_NORMAL)) {
BKE_mesh_calc_normals_split(&surface_orig);
}
const Span<float3> corner_normals_su = {
reinterpret_cast<const float3 *>(CustomData_get_layer(&surface_orig.ldata, CD_NORMAL)),
surface_orig.totloop};
const geometry::ReverseUVSampler reverse_uv_sampler{surface_uv_map, surface_looptris_orig};
geometry::AddCurvesOnMeshInputs add_inputs;
add_inputs.uvs = sampled_uvs;
add_inputs.interpolate_length = brush_settings_->flag &
BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_LENGTH;
add_inputs.interpolate_shape = brush_settings_->flag &
BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_SHAPE;
add_inputs.interpolate_point_count = brush_settings_->flag &
BRUSH_CURVES_SCULPT_FLAG_INTERPOLATE_POINT_COUNT;
add_inputs.fallback_curve_length = brush_settings_->curve_length;
add_inputs.fallback_point_count = std::max(2, brush_settings_->points_per_curve);
add_inputs.transforms = &transforms_;
add_inputs.reverse_uv_sampler = &reverse_uv_sampler;
add_inputs.surface = &surface_orig;
add_inputs.corner_normals_su = corner_normals_su;
if (add_inputs.interpolate_length || add_inputs.interpolate_shape ||
add_inputs.interpolate_point_count) {
this->ensure_curve_roots_kdtree();
add_inputs.old_roots_kdtree = self_->curve_roots_kdtree_;
}
const geometry::AddCurvesOnMeshOutputs add_outputs = geometry::add_curves_on_mesh(
*curves_orig_, add_inputs);
if (add_outputs.uv_error) {
report_invalid_uv_map(stroke_extension.reports);
}
DEG_id_tag_update(&curves_id_orig_->id, ID_RECALC_GEOMETRY);
WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_orig_->id);
ED_region_tag_redraw(ctx_.region);
}
/**
* Sample a single point exactly at the mouse position.
*/
void sample_in_center_with_symmetry(Vector<float2> &r_sampled_uvs)
{
float3 ray_start_wo, ray_end_wo;
ED_view3d_win_to_segment_clipped(
ctx_.depsgraph, ctx_.region, ctx_.v3d, brush_pos_re_, ray_start_wo, ray_end_wo, true);
const float3 ray_start_cu = transforms_.world_to_curves * ray_start_wo;
const float3 ray_end_cu = transforms_.world_to_curves * ray_end_wo;
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_orig_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
const float4x4 transform = transforms_.curves_to_surface * brush_transform;
this->sample_in_center(r_sampled_uvs, transform * ray_start_cu, transform * ray_end_cu);
}
}
void sample_in_center(Vector<float2> &r_sampled_uvs,
const float3 &ray_start_su,
const float3 &ray_end_su)
{
const float3 ray_direction_su = math::normalize(ray_end_su - ray_start_su);
BVHTreeRayHit ray_hit;
ray_hit.dist = FLT_MAX;
ray_hit.index = -1;
BLI_bvhtree_ray_cast(surface_bvh_eval_.tree,
ray_start_su,
ray_direction_su,
0.0f,
&ray_hit,
surface_bvh_eval_.raycast_callback,
&surface_bvh_eval_);
if (ray_hit.index == -1) {
return;
}
const int looptri_index = ray_hit.index;
const MLoopTri &looptri = surface_looptris_eval_[looptri_index];
const float3 brush_pos_su = ray_hit.co;
const float3 bary_coords = bke::mesh_surface_sample::compute_bary_coord_in_triangle(
*surface_eval_, looptri, brush_pos_su);
const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
bary_coords, looptri, surface_uv_map_eval_);
r_sampled_uvs.append(uv);
}
/**
* Sample points by shooting rays within the brush radius in the 3D view.
*/
void sample_projected_with_symmetry(RandomNumberGenerator &rng, Vector<float2> &r_sampled_uvs)
{
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_orig_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
this->sample_projected(rng, r_sampled_uvs, brush_transform);
}
}
void sample_projected(RandomNumberGenerator &rng,
Vector<float2> &r_sampled_uvs,
const float4x4 &brush_transform)
{
const int old_amount = r_sampled_uvs.size();
const int max_iterations = 100;
int current_iteration = 0;
while (r_sampled_uvs.size() < old_amount + add_amount_) {
if (current_iteration++ >= max_iterations) {
break;
}
Vector<float3> bary_coords;
Vector<int> looptri_indices;
Vector<float3> positions_su;
const int missing_amount = add_amount_ + old_amount - r_sampled_uvs.size();
const int new_points = bke::mesh_surface_sample::sample_surface_points_projected(
rng,
*surface_eval_,
surface_bvh_eval_,
brush_pos_re_,
brush_radius_re_,
[&](const float2 &pos_re, float3 &r_start_su, float3 &r_end_su) {
float3 start_wo, end_wo;
ED_view3d_win_to_segment_clipped(
ctx_.depsgraph, ctx_.region, ctx_.v3d, pos_re, start_wo, end_wo, true);
const float3 start_cu = brush_transform * (transforms_.world_to_curves * start_wo);
const float3 end_cu = brush_transform * (transforms_.world_to_curves * end_wo);
r_start_su = transforms_.curves_to_surface * start_cu;
r_end_su = transforms_.curves_to_surface * end_cu;
},
use_front_face_,
add_amount_,
missing_amount,
bary_coords,
looptri_indices,
positions_su);
for (const int i : IndexRange(new_points)) {
const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
bary_coords[i], surface_looptris_eval_[looptri_indices[i]], surface_uv_map_eval_);
r_sampled_uvs.append(uv);
}
}
}
/**
* Sample points in a 3D sphere around the surface position that the mouse hovers over.
*/
void sample_spherical_with_symmetry(RandomNumberGenerator &rng, Vector<float2> &r_sampled_uvs)
{
const std::optional<CurvesBrush3D> brush_3d = sample_curves_surface_3d_brush(*ctx_.depsgraph,
*ctx_.region,
*ctx_.v3d,
transforms_,
surface_bvh_eval_,
brush_pos_re_,
brush_radius_re_);
if (!brush_3d.has_value()) {
return;
}
float3 view_ray_start_wo, view_ray_end_wo;
ED_view3d_win_to_segment_clipped(ctx_.depsgraph,
ctx_.region,
ctx_.v3d,
brush_pos_re_,
view_ray_start_wo,
view_ray_end_wo,
true);
const float3 view_ray_start_cu = transforms_.world_to_curves * view_ray_start_wo;
const float3 view_ray_end_cu = transforms_.world_to_curves * view_ray_end_wo;
const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
eCurvesSymmetryType(curves_id_orig_->symmetry));
for (const float4x4 &brush_transform : symmetry_brush_transforms) {
const float4x4 transform = transforms_.curves_to_surface * brush_transform;
const float3 brush_pos_su = transform * brush_3d->position_cu;
const float3 view_direction_su = math::normalize(transform * view_ray_end_cu -
transform * view_ray_start_cu);
const float brush_radius_su = transform_brush_radius(
transform, brush_3d->position_cu, brush_3d->radius_cu);
this->sample_spherical(rng, r_sampled_uvs, brush_pos_su, brush_radius_su, view_direction_su);
}
}
void sample_spherical(RandomNumberGenerator &rng,
Vector<float2> &r_sampled_uvs,
const float3 &brush_pos_su,
const float brush_radius_su,
const float3 &view_direction_su)
{
const float brush_radius_sq_su = pow2f(brush_radius_su);
/* Find surface triangles within brush radius. */
Vector<int> selected_looptri_indices;
if (use_front_face_) {
BLI_bvhtree_range_query_cpp(
*surface_bvh_eval_.tree,
brush_pos_su,
brush_radius_su,
[&](const int index, const float3 &UNUSED(co), const float UNUSED(dist_sq)) {
const MLoopTri &looptri = surface_looptris_eval_[index];
const float3 v0_su = surface_eval_->mvert[surface_eval_->mloop[looptri.tri[0]].v].co;
const float3 v1_su = surface_eval_->mvert[surface_eval_->mloop[looptri.tri[1]].v].co;
const float3 v2_su = surface_eval_->mvert[surface_eval_->mloop[looptri.tri[2]].v].co;
float3 normal_su;
normal_tri_v3(normal_su, v0_su, v1_su, v2_su);
if (math::dot(normal_su, view_direction_su) >= 0.0f) {
return;
}
selected_looptri_indices.append(index);
});
}
else {
BLI_bvhtree_range_query_cpp(
*surface_bvh_eval_.tree,
brush_pos_su,
brush_radius_su,
[&](const int index, const float3 &UNUSED(co), const float UNUSED(dist_sq)) {
selected_looptri_indices.append(index);
});
}
/* Density used for sampling points. This does not have to be exact, because the loop below
* automatically runs until enough samples have been found. If too many samples are found, some
* will be discarded afterwards. */
const float brush_plane_area_su = M_PI * brush_radius_sq_su;
const float approximate_density_su = add_amount_ / brush_plane_area_su;
/* Usually one or two iterations should be enough. */
const int max_iterations = 5;
int current_iteration = 0;
const int old_amount = r_sampled_uvs.size();
while (r_sampled_uvs.size() < old_amount + add_amount_) {
if (current_iteration++ >= max_iterations) {
break;
}
Vector<float3> bary_coords;
Vector<int> looptri_indices;
Vector<float3> positions_su;
const int new_points = bke::mesh_surface_sample::sample_surface_points_spherical(
rng,
*surface_eval_,
selected_looptri_indices,
brush_pos_su,
brush_radius_su,
approximate_density_su,
bary_coords,
looptri_indices,
positions_su);
for (const int i : IndexRange(new_points)) {
const float2 uv = bke::mesh_surface_sample::sample_corner_attrribute_with_bary_coords(
bary_coords[i], surface_looptris_eval_[looptri_indices[i]], surface_uv_map_eval_);
r_sampled_uvs.append(uv);
}
}
/* Remove samples when there are too many. */
while (r_sampled_uvs.size() > old_amount + add_amount_) {
const int index_to_remove = rng.get_int32(add_amount_) + old_amount;
r_sampled_uvs.remove_and_reorder(index_to_remove);
}
}
void ensure_curve_roots_kdtree()
{
if (self_->curve_roots_kdtree_ == nullptr) {
self_->curve_roots_kdtree_ = BLI_kdtree_3d_new(curves_orig_->curves_num());
for (const int curve_i : curves_orig_->curves_range()) {
const int root_point_i = curves_orig_->offsets()[curve_i];
const float3 &root_pos_cu = curves_orig_->positions()[root_point_i];
BLI_kdtree_3d_insert(self_->curve_roots_kdtree_, curve_i, root_pos_cu);
}
BLI_kdtree_3d_balance(self_->curve_roots_kdtree_);
}
}
};
void AddOperation::on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension)
{
AddOperationExecutor executor{C};
executor.execute(*this, C, stroke_extension);
}
std::unique_ptr<CurvesSculptStrokeOperation> new_add_operation()
{
return std::make_unique<AddOperation>();
}
} // namespace blender::ed::sculpt_paint
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