349 lines
14 KiB
C++
349 lines
14 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "BKE_attribute_math.hh"
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#include "BKE_brush.hh"
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#include "BKE_bvhutils.hh"
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#include "BKE_context.hh"
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#include "BKE_crazyspace.hh"
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#include "BKE_mesh.hh"
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#include "BKE_mesh_runtime.hh"
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#include "ED_screen.hh"
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#include "ED_view3d.hh"
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#include "DEG_depsgraph.hh"
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#include "DNA_brush_types.h"
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#include "WM_api.hh"
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#include "BLI_length_parameterize.hh"
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#include "BLI_math_geom.h"
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#include "BLI_math_matrix.hh"
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#include "BLI_task.hh"
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#include "GEO_add_curves_on_mesh.hh"
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#include "curves_sculpt_intern.hh"
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namespace blender::ed::sculpt_paint {
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class PuffOperation : public CurvesSculptStrokeOperation {
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private:
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/** Only used when a 3D brush is used. */
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CurvesBrush3D brush_3d_;
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/** Solver for length and collision constraints. */
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CurvesConstraintSolver constraint_solver_;
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friend struct PuffOperationExecutor;
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public:
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void on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension) override;
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};
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/**
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* Utility class that actually executes the update when the stroke is updated. That's useful
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* because it avoids passing a very large number of parameters between functions.
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*/
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struct PuffOperationExecutor {
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PuffOperation *self_ = nullptr;
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CurvesSculptCommonContext ctx_;
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Object *object_ = nullptr;
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Curves *curves_id_ = nullptr;
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CurvesGeometry *curves_ = nullptr;
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VArray<float> point_factors_;
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IndexMaskMemory selected_curve_memory_;
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IndexMask curve_selection_;
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const CurvesSculpt *curves_sculpt_ = nullptr;
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const Brush *brush_ = nullptr;
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float brush_radius_base_re_;
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float brush_radius_factor_;
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float brush_strength_;
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float2 brush_pos_re_;
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CurvesSurfaceTransforms transforms_;
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const Object *surface_ob_ = nullptr;
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const Mesh *surface_ = nullptr;
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Span<float3> surface_positions_;
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Span<int> surface_corner_verts_;
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Span<int3> surface_corner_tris_;
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Span<float3> corner_normals_su_;
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BVHTreeFromMesh surface_bvh_;
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PuffOperationExecutor(const bContext &C) : ctx_(C) {}
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void execute(PuffOperation &self, const bContext &C, const StrokeExtension &stroke_extension)
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{
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UNUSED_VARS(C, stroke_extension);
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self_ = &self;
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object_ = CTX_data_active_object(&C);
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curves_id_ = static_cast<Curves *>(object_->data);
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curves_ = &curves_id_->geometry.wrap();
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if (curves_->curves_num() == 0) {
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return;
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}
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if (curves_id_->surface == nullptr || curves_id_->surface->type != OB_MESH) {
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report_missing_surface(stroke_extension.reports);
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return;
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}
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curves_sculpt_ = ctx_.scene->toolsettings->curves_sculpt;
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brush_ = BKE_paint_brush_for_read(&curves_sculpt_->paint);
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brush_radius_base_re_ = BKE_brush_size_get(ctx_.scene, brush_);
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brush_radius_factor_ = brush_radius_factor(*brush_, stroke_extension);
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brush_strength_ = brush_strength_get(*ctx_.scene, *brush_, stroke_extension);
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brush_pos_re_ = stroke_extension.mouse_position;
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point_factors_ = *curves_->attributes().lookup_or_default<float>(
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".selection", bke::AttrDomain::Point, 1.0f);
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curve_selection_ = curves::retrieve_selected_curves(*curves_id_, selected_curve_memory_);
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const eBrushFalloffShape falloff_shape = eBrushFalloffShape(brush_->falloff_shape);
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surface_ob_ = curves_id_->surface;
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surface_ = static_cast<const Mesh *>(surface_ob_->data);
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transforms_ = CurvesSurfaceTransforms(*object_, surface_ob_);
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surface_positions_ = surface_->vert_positions();
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surface_corner_verts_ = surface_->corner_verts();
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surface_corner_tris_ = surface_->corner_tris();
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corner_normals_su_ = surface_->corner_normals();
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BKE_bvhtree_from_mesh_get(&surface_bvh_, surface_, BVHTREE_FROM_CORNER_TRIS, 2);
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BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh_); });
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if (stroke_extension.is_first) {
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if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
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self.brush_3d_ = *sample_curves_3d_brush(*ctx_.depsgraph,
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*ctx_.region,
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*ctx_.v3d,
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*ctx_.rv3d,
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*object_,
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brush_pos_re_,
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brush_radius_base_re_);
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}
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self_->constraint_solver_.initialize(
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*curves_, curve_selection_, curves_id_->flag & CV_SCULPT_COLLISION_ENABLED);
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}
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Array<float> curve_weights(curves_->curves_num(), 0.0f);
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if (falloff_shape == PAINT_FALLOFF_SHAPE_TUBE) {
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this->find_curve_weights_projected_with_symmetry(curve_weights);
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}
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else if (falloff_shape == PAINT_FALLOFF_SHAPE_SPHERE) {
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this->find_curves_weights_spherical_with_symmetry(curve_weights);
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}
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else {
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BLI_assert_unreachable();
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}
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IndexMaskMemory memory;
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const IndexMask curves_mask = IndexMask::from_predicate(
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curve_selection_, GrainSize(4096), memory, [&](const int64_t curve_i) {
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return curve_weights[curve_i] > 0.0f;
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});
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this->puff(curves_mask, curve_weights);
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self_->constraint_solver_.solve_step(*curves_, curves_mask, surface_, transforms_);
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curves_->tag_positions_changed();
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DEG_id_tag_update(&curves_id_->id, ID_RECALC_GEOMETRY);
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WM_main_add_notifier(NC_GEOM | ND_DATA, &curves_id_->id);
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ED_region_tag_redraw(ctx_.region);
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}
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void find_curve_weights_projected_with_symmetry(MutableSpan<float> r_curve_weights)
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{
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const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
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eCurvesSymmetryType(curves_id_->symmetry));
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for (const float4x4 &brush_transform : symmetry_brush_transforms) {
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this->find_curve_weights_projected(brush_transform, r_curve_weights);
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}
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}
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void find_curve_weights_projected(const float4x4 &brush_transform,
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MutableSpan<float> r_curve_weights)
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{
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const float4x4 brush_transform_inv = math::invert(brush_transform);
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const float4x4 projection = ED_view3d_ob_project_mat_get(ctx_.rv3d, object_);
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const float brush_radius_re = brush_radius_base_re_ * brush_radius_factor_;
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const float brush_radius_sq_re = pow2f(brush_radius_re);
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const bke::crazyspace::GeometryDeformation deformation =
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bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
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const OffsetIndices points_by_curve = curves_->points_by_curve();
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curve_selection_.foreach_index(GrainSize(256), [&](const int64_t curve_i) {
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const IndexRange points = points_by_curve[curve_i];
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const float3 first_pos_cu = math::transform_point(brush_transform_inv,
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deformation.positions[points[0]]);
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float2 prev_pos_re = ED_view3d_project_float_v2_m4(ctx_.region, first_pos_cu, projection);
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float max_weight = 0.0f;
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for (const int point_i : points.drop_front(1)) {
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const float3 pos_cu = math::transform_point(brush_transform_inv,
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deformation.positions[point_i]);
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const float2 pos_re = ED_view3d_project_float_v2_m4(ctx_.region, pos_cu, projection);
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BLI_SCOPED_DEFER([&]() { prev_pos_re = pos_re; });
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const float dist_to_brush_sq_re = dist_squared_to_line_segment_v2(
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brush_pos_re_, prev_pos_re, pos_re);
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if (dist_to_brush_sq_re > brush_radius_sq_re) {
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continue;
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}
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const float dist_to_brush_re = std::sqrt(dist_to_brush_sq_re);
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const float radius_falloff = BKE_brush_curve_strength(
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brush_, dist_to_brush_re, brush_radius_re);
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math::max_inplace(max_weight, radius_falloff);
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}
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math::max_inplace(r_curve_weights[curve_i], max_weight);
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});
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}
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void find_curves_weights_spherical_with_symmetry(MutableSpan<float> r_curve_weights)
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{
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float3 brush_pos_wo;
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ED_view3d_win_to_3d(
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ctx_.v3d,
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ctx_.region,
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math::transform_point(transforms_.curves_to_world, self_->brush_3d_.position_cu),
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brush_pos_re_,
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brush_pos_wo);
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const float3 brush_pos_cu = math::transform_point(transforms_.world_to_curves, brush_pos_wo);
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const float brush_radius_cu = self_->brush_3d_.radius_cu * brush_radius_factor_;
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const Vector<float4x4> symmetry_brush_transforms = get_symmetry_brush_transforms(
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eCurvesSymmetryType(curves_id_->symmetry));
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for (const float4x4 &brush_transform : symmetry_brush_transforms) {
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this->find_curves_weights_spherical(
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math::transform_point(brush_transform, brush_pos_cu), brush_radius_cu, r_curve_weights);
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}
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}
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void find_curves_weights_spherical(const float3 &brush_pos_cu,
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const float brush_radius_cu,
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MutableSpan<float> r_curve_weights)
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{
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const float brush_radius_sq_cu = pow2f(brush_radius_cu);
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const bke::crazyspace::GeometryDeformation deformation =
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bke::crazyspace::get_evaluated_curves_deformation(*ctx_.depsgraph, *object_);
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const OffsetIndices points_by_curve = curves_->points_by_curve();
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curve_selection_.foreach_index(GrainSize(256), [&](const int64_t curve_i) {
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const IndexRange points = points_by_curve[curve_i];
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float max_weight = 0.0f;
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for (const int point_i : points.drop_front(1)) {
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const float3 &prev_pos_cu = deformation.positions[point_i - 1];
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const float3 &pos_cu = deformation.positions[point_i];
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const float dist_to_brush_sq_cu = dist_squared_to_line_segment_v3(
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brush_pos_cu, prev_pos_cu, pos_cu);
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if (dist_to_brush_sq_cu > brush_radius_sq_cu) {
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continue;
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}
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const float dist_to_brush_cu = std::sqrt(dist_to_brush_sq_cu);
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const float radius_falloff = BKE_brush_curve_strength(
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brush_, dist_to_brush_cu, brush_radius_cu);
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math::max_inplace(max_weight, radius_falloff);
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}
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math::max_inplace(r_curve_weights[curve_i], max_weight);
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});
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}
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void puff(const IndexMask &selection, const Span<float> curve_weights)
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{
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const OffsetIndices points_by_curve = curves_->points_by_curve();
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MutableSpan<float3> positions_cu = curves_->positions_for_write();
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selection.foreach_segment(GrainSize(256), [&](IndexMaskSegment segment) {
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Vector<float> accumulated_lengths_cu;
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for (const int curve_i : segment) {
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const IndexRange points = points_by_curve[curve_i];
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const int first_point_i = points[0];
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const float3 first_pos_cu = positions_cu[first_point_i];
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const float3 first_pos_su = math::transform_point(transforms_.curves_to_surface,
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first_pos_cu);
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/* Find the nearest position on the surface. The curve will be aligned to the normal of
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* that point. */
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BVHTreeNearest nearest;
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nearest.dist_sq = FLT_MAX;
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BLI_bvhtree_find_nearest(surface_bvh_.tree,
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first_pos_su,
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&nearest,
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surface_bvh_.nearest_callback,
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&surface_bvh_);
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const int3 &tri = surface_corner_tris_[nearest.index];
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const float3 closest_pos_su = nearest.co;
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const float3 &v0_su = surface_positions_[surface_corner_verts_[tri[0]]];
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const float3 &v1_su = surface_positions_[surface_corner_verts_[tri[1]]];
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const float3 &v2_su = surface_positions_[surface_corner_verts_[tri[2]]];
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float3 bary_coords;
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interp_weights_tri_v3(bary_coords, v0_su, v1_su, v2_su, closest_pos_su);
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const float3 normal_su = geometry::compute_surface_point_normal(
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tri, bary_coords, corner_normals_su_);
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const float3 normal_cu = math::normalize(
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math::transform_direction(transforms_.surface_to_curves_normal, normal_su));
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accumulated_lengths_cu.reinitialize(points.size() - 1);
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length_parameterize::accumulate_lengths<float3>(
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positions_cu.slice(points), false, accumulated_lengths_cu);
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/* Align curve to the surface normal while making sure that the curve does not fold up much
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* in the process (e.g. when the curve was pointing in the opposite direction before). */
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for (const int i : IndexRange(points.size()).drop_front(1)) {
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const int point_i = points[i];
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const float3 old_pos_cu = positions_cu[point_i];
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/* Compute final position of the point. */
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const float length_param_cu = accumulated_lengths_cu[i - 1];
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const float3 goal_pos_cu = first_pos_cu + length_param_cu * normal_cu;
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const float weight = 0.01f * brush_strength_ * point_factors_[point_i] *
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curve_weights[curve_i];
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float3 new_pos_cu = math::interpolate(old_pos_cu, goal_pos_cu, weight);
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/* Make sure the point does not move closer to the root point than it was initially. This
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* makes the curve kind of "rotate up". */
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const float old_dist_to_root_cu = math::distance(old_pos_cu, first_pos_cu);
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const float new_dist_to_root_cu = math::distance(new_pos_cu, first_pos_cu);
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if (new_dist_to_root_cu < old_dist_to_root_cu) {
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const float3 offset = math::normalize(new_pos_cu - first_pos_cu);
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new_pos_cu += (old_dist_to_root_cu - new_dist_to_root_cu) * offset;
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}
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positions_cu[point_i] = new_pos_cu;
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}
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}
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});
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}
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};
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void PuffOperation::on_stroke_extended(const bContext &C, const StrokeExtension &stroke_extension)
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{
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PuffOperationExecutor executor{C};
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executor.execute(*this, C, stroke_extension);
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}
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std::unique_ptr<CurvesSculptStrokeOperation> new_puff_operation()
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{
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return std::make_unique<PuffOperation>();
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}
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} // namespace blender::ed::sculpt_paint
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