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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <algorithm>
#include "curves_sculpt_intern.hh"
#include "BKE_attribute_math.hh"
#include "BKE_bvhutils.h"
#include "BKE_context.h"
#include "BKE_curves.hh"
#include "BKE_modifier.h"
#include "BKE_object.h"
#include "BKE_report.h"
#include "ED_view3d.h"
#include "UI_interface.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BLI_enumerable_thread_specific.hh"
#include "BLI_length_parameterize.hh"
#include "BLI_task.hh"
#include "DEG_depsgraph_query.h"
#include "BLT_translation.h"
/**
* The code below uses a prefix 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 {
struct BrushPositionCandidate {
/** 3D position of the brush. */
float3 position_cu;
/** Squared distance from the mouse position in screen space. */
float distance_sq_re = FLT_MAX;
/** Measure for how far away the candidate is from the camera. */
float depth_sq_cu = FLT_MAX;
};
/**
* Determine the 3D position of a brush based on curve segments under a screen position.
*/
static std::optional<float3> find_curves_brush_position(const CurvesGeometry &curves,
const float3 &ray_start_cu,
const float3 &ray_end_cu,
const float brush_radius_re,
const ARegion ®ion,
const RegionView3D &rv3d,
const Object &object,
const Span<float3> positions)
{
/* This value might have to be adjusted based on user feedback. */
const float brush_inner_radius_re = std::min<float>(brush_radius_re, (float)UI_UNIT_X / 3.0f);
const float brush_inner_radius_sq_re = pow2f(brush_inner_radius_re);
float4x4 projection;
ED_view3d_ob_project_mat_get(&rv3d, &object, projection.values);
float2 brush_pos_re;
ED_view3d_project_float_v2_m4(®ion, ray_start_cu, brush_pos_re, projection.values);
const float max_depth_sq_cu = math::distance_squared(ray_start_cu, ray_end_cu);
/* Contains the logic that checks if `b` is a better candidate than `a`. */
auto is_better_candidate = [&](const BrushPositionCandidate &a,
const BrushPositionCandidate &b) {
if (b.distance_sq_re <= brush_inner_radius_sq_re) {
if (a.distance_sq_re > brush_inner_radius_sq_re) {
/* New candidate is in inner radius while old one is not. */
return true;
}
if (b.depth_sq_cu < a.depth_sq_cu) {
/* Both candidates are in inner radius, but new one is closer to the camera. */
return true;
}
}
else if (b.distance_sq_re < a.distance_sq_re) {
/* Both candidates are outside of inner radius, but new on is closer to the brush center. */
return true;
}
return false;
};
auto update_if_better = [&](BrushPositionCandidate &a, const BrushPositionCandidate &b) {
if (is_better_candidate(a, b)) {
a = b;
}
};
BrushPositionCandidate best_candidate = threading::parallel_reduce(
curves.curves_range(),
128,
BrushPositionCandidate(),
[&](IndexRange curves_range, const BrushPositionCandidate &init) {
BrushPositionCandidate best_candidate = init;
for (const int curve_i : curves_range) {
const IndexRange points = curves.points_for_curve(curve_i);
if (points.size() == 1) {
const float3 &pos_cu = positions[points.first()];
const float depth_sq_cu = math::distance_squared(ray_start_cu, pos_cu);
if (depth_sq_cu > max_depth_sq_cu) {
continue;
}
float2 pos_re;
ED_view3d_project_float_v2_m4(®ion, pos_cu, pos_re, projection.values);
BrushPositionCandidate candidate;
candidate.position_cu = pos_cu;
candidate.depth_sq_cu = depth_sq_cu;
candidate.distance_sq_re = math::distance_squared(brush_pos_re, pos_re);
update_if_better(best_candidate, candidate);
continue;
}
for (const int segment_i : points.drop_back(1)) {
const float3 &p1_cu = positions[segment_i];
const float3 &p2_cu = positions[segment_i + 1];
float2 p1_re, p2_re;
ED_view3d_project_float_v2_m4(®ion, p1_cu, p1_re, projection.values);
ED_view3d_project_float_v2_m4(®ion, p2_cu, p2_re, projection.values);
float2 closest_re;
const float lambda = closest_to_line_segment_v2(
closest_re, brush_pos_re, p1_re, p2_re);
const float3 closest_cu = math::interpolate(p1_cu, p2_cu, lambda);
const float depth_sq_cu = math::distance_squared(ray_start_cu, closest_cu);
if (depth_sq_cu > max_depth_sq_cu) {
continue;
}
const float distance_sq_re = math::distance_squared(brush_pos_re, closest_re);
float3 brush_position_cu;
closest_to_line_segment_v3(brush_position_cu, closest_cu, ray_start_cu, ray_end_cu);
BrushPositionCandidate candidate;
candidate.position_cu = brush_position_cu;
candidate.depth_sq_cu = depth_sq_cu;
candidate.distance_sq_re = distance_sq_re;
update_if_better(best_candidate, candidate);
}
}
return best_candidate;
},
[&](const BrushPositionCandidate &a, const BrushPositionCandidate &b) {
return is_better_candidate(a, b) ? b : a;
});
if (best_candidate.distance_sq_re == FLT_MAX) {
/* Nothing found. */
return std::nullopt;
}
return best_candidate.position_cu;
}
std::optional<CurvesBrush3D> sample_curves_3d_brush(const Depsgraph &depsgraph,
const ARegion ®ion,
const View3D &v3d,
const RegionView3D &rv3d,
const Object &curves_object,
const float2 &brush_pos_re,
const float brush_radius_re)
{
const Curves &curves_id = *static_cast<Curves *>(curves_object.data);
const CurvesGeometry &curves = CurvesGeometry::wrap(curves_id.geometry);
Object *surface_object = curves_id.surface;
Object *surface_object_eval = DEG_get_evaluated_object(&depsgraph, surface_object);
float3 center_ray_start_wo, center_ray_end_wo;
ED_view3d_win_to_segment_clipped(
&depsgraph, ®ion, &v3d, brush_pos_re, center_ray_start_wo, center_ray_end_wo, true);
/* Shorten ray when the surface object is hit. */
if (surface_object_eval != nullptr) {
const float4x4 surface_to_world_mat = surface_object->obmat;
const float4x4 world_to_surface_mat = surface_to_world_mat.inverted();
Mesh *surface_eval = BKE_object_get_evaluated_mesh(surface_object_eval);
BVHTreeFromMesh surface_bvh;
BKE_bvhtree_from_mesh_get(&surface_bvh, surface_eval, BVHTREE_FROM_LOOPTRI, 2);
BLI_SCOPED_DEFER([&]() { free_bvhtree_from_mesh(&surface_bvh); });
const float3 center_ray_start_su = world_to_surface_mat * center_ray_start_wo;
float3 center_ray_end_su = world_to_surface_mat * center_ray_end_wo;
const float3 center_ray_direction_su = math::normalize(center_ray_end_su -
center_ray_start_su);
BVHTreeRayHit center_ray_hit;
center_ray_hit.dist = FLT_MAX;
center_ray_hit.index = -1;
BLI_bvhtree_ray_cast(surface_bvh.tree,
center_ray_start_su,
center_ray_direction_su,
0.0f,
¢er_ray_hit,
surface_bvh.raycast_callback,
&surface_bvh);
if (center_ray_hit.index >= 0) {
const float3 hit_position_su = center_ray_hit.co;
if (math::distance(center_ray_start_su, center_ray_end_su) >
math::distance(center_ray_start_su, hit_position_su)) {
center_ray_end_su = hit_position_su;
center_ray_end_wo = surface_to_world_mat * center_ray_end_su;
}
}
}
const float4x4 curves_to_world_mat = curves_object.obmat;
const float4x4 world_to_curves_mat = curves_to_world_mat.inverted();
const float3 center_ray_start_cu = world_to_curves_mat * center_ray_start_wo;
const float3 center_ray_end_cu = world_to_curves_mat * center_ray_end_wo;
const bke::crazyspace::GeometryDeformation deformation =
bke::crazyspace::get_evaluated_curves_deformation(depsgraph, curves_object);
const std::optional<float3> brush_position_optional_cu = find_curves_brush_position(
curves,
center_ray_start_cu,
center_ray_end_cu,
brush_radius_re,
region,
rv3d,
curves_object,
deformation.positions);
if (!brush_position_optional_cu.has_value()) {
/* Nothing found. */
return std::nullopt;
}
const float3 brush_position_cu = *brush_position_optional_cu;
/* Determine the 3D brush radius. */
float3 radius_ray_start_wo, radius_ray_end_wo;
ED_view3d_win_to_segment_clipped(&depsgraph,
®ion,
&v3d,
brush_pos_re + float2(brush_radius_re, 0.0f),
radius_ray_start_wo,
radius_ray_end_wo,
true);
const float3 radius_ray_start_cu = world_to_curves_mat * radius_ray_start_wo;
const float3 radius_ray_end_cu = world_to_curves_mat * radius_ray_end_wo;
CurvesBrush3D brush_3d;
brush_3d.position_cu = brush_position_cu;
brush_3d.radius_cu = dist_to_line_v3(brush_position_cu, radius_ray_start_cu, radius_ray_end_cu);
return brush_3d;
}
std::optional<CurvesBrush3D> sample_curves_surface_3d_brush(
const Depsgraph &depsgraph,
const ARegion ®ion,
const View3D &v3d,
const CurvesSurfaceTransforms &transforms,
const BVHTreeFromMesh &surface_bvh,
const float2 &brush_pos_re,
const float brush_radius_re)
{
float3 brush_ray_start_wo, brush_ray_end_wo;
ED_view3d_win_to_segment_clipped(
&depsgraph, ®ion, &v3d, brush_pos_re, brush_ray_start_wo, brush_ray_end_wo, true);
const float3 brush_ray_start_su = transforms.world_to_surface * brush_ray_start_wo;
const float3 brush_ray_end_su = transforms.world_to_surface * brush_ray_end_wo;
const float3 brush_ray_direction_su = math::normalize(brush_ray_end_su - brush_ray_start_su);
BVHTreeRayHit ray_hit;
ray_hit.dist = FLT_MAX;
ray_hit.index = -1;
BLI_bvhtree_ray_cast(surface_bvh.tree,
brush_ray_start_su,
brush_ray_direction_su,
0.0f,
&ray_hit,
surface_bvh.raycast_callback,
const_cast<void *>(static_cast<const void *>(&surface_bvh)));
if (ray_hit.index == -1) {
return std::nullopt;
}
float3 brush_radius_ray_start_wo, brush_radius_ray_end_wo;
ED_view3d_win_to_segment_clipped(&depsgraph,
®ion,
&v3d,
brush_pos_re + float2(brush_radius_re, 0),
brush_radius_ray_start_wo,
brush_radius_ray_end_wo,
true);
const float3 brush_radius_ray_start_cu = transforms.world_to_curves * brush_radius_ray_start_wo;
const float3 brush_radius_ray_end_cu = transforms.world_to_curves * brush_radius_ray_end_wo;
const float3 brush_pos_su = ray_hit.co;
const float3 brush_pos_cu = transforms.surface_to_curves * brush_pos_su;
const float brush_radius_cu = dist_to_line_v3(
brush_pos_cu, brush_radius_ray_start_cu, brush_radius_ray_end_cu);
return CurvesBrush3D{brush_pos_cu, brush_radius_cu};
}
Vector<float4x4> get_symmetry_brush_transforms(const eCurvesSymmetryType symmetry)
{
Vector<float4x4> matrices;
auto symmetry_to_factors = [&](const eCurvesSymmetryType type) -> Span<float> {
if (symmetry & type) {
static std::array<float, 2> values = {1.0f, -1.0f};
return values;
}
static std::array<float, 1> values = {1.0f};
return values;
};
for (const float x : symmetry_to_factors(CURVES_SYMMETRY_X)) {
for (const float y : symmetry_to_factors(CURVES_SYMMETRY_Y)) {
for (const float z : symmetry_to_factors(CURVES_SYMMETRY_Z)) {
float4x4 matrix = float4x4::identity();
matrix.values[0][0] = x;
matrix.values[1][1] = y;
matrix.values[2][2] = z;
matrices.append(matrix);
}
}
}
return matrices;
}
float transform_brush_radius(const float4x4 &transform,
const float3 &brush_position,
const float old_radius)
{
const float3 offset_position = brush_position + float3(old_radius, 0.0f, 0.0f);
const float3 new_position = transform * brush_position;
const float3 new_offset_position = transform * offset_position;
return math::distance(new_position, new_offset_position);
}
void move_last_point_and_resample(MutableSpan<float3> positions, const float3 &new_last_position)
{
/* Find the accumulated length of each point in the original curve,
* treating it as a poly curve for performance reasons and simplicity. */
Array<float> orig_lengths(length_parameterize::segments_num(positions.size(), false));
length_parameterize::accumulate_lengths<float3>(positions, false, orig_lengths);
const float orig_total_length = orig_lengths.last();
/* Find the factor by which the new curve is shorter or longer than the original. */
const float new_last_segment_length = math::distance(positions.last(1), new_last_position);
const float new_total_length = orig_lengths.last(1) + new_last_segment_length;
const float length_factor = safe_divide(new_total_length, orig_total_length);
/* Calculate the lengths to sample the original curve with by scaling the original lengths. */
Array<float> new_lengths(positions.size() - 1);
new_lengths.first() = 0.0f;
for (const int i : new_lengths.index_range().drop_front(1)) {
new_lengths[i] = orig_lengths[i - 1] * length_factor;
}
Array<int> indices(positions.size() - 1);
Array<float> factors(positions.size() - 1);
length_parameterize::sample_at_lengths(orig_lengths, new_lengths, indices, factors);
Array<float3> new_positions(positions.size() - 1);
length_parameterize::interpolate<float3>(positions, indices, factors, new_positions);
positions.drop_back(1).copy_from(new_positions);
positions.last() = new_last_position;
}
CurvesSculptCommonContext::CurvesSculptCommonContext(const bContext &C)
{
this->depsgraph = CTX_data_depsgraph_pointer(&C);
this->scene = CTX_data_scene(&C);
this->region = CTX_wm_region(&C);
this->v3d = CTX_wm_view3d(&C);
this->rv3d = CTX_wm_region_view3d(&C);
}
void report_missing_surface(ReportList *reports)
{
BKE_report(reports, RPT_WARNING, TIP_("Missing surface mesh"));
}
void report_missing_uv_map_on_original_surface(ReportList *reports)
{
BKE_report(
reports, RPT_WARNING, TIP_("Missing UV map for attaching curves on original surface"));
}
void report_missing_uv_map_on_evaluated_surface(ReportList *reports)
{
BKE_report(
reports, RPT_WARNING, TIP_("Missing UV map for attaching curves on evaluated surface"));
}
} // namespace blender::ed::sculpt_paint
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