e955c94ed3
Listing the "Blender Foundation" as copyright holder implied the Blender Foundation holds copyright to files which may include work from many developers. While keeping copyright on headers makes sense for isolated libraries, Blender's own code may be refactored or moved between files in a way that makes the per file copyright holders less meaningful. Copyright references to the "Blender Foundation" have been replaced with "Blender Authors", with the exception of `./extern/` since these this contains libraries which are more isolated, any changed to license headers there can be handled on a case-by-case basis. Some directories in `./intern/` have also been excluded: - `./intern/cycles/` it's own `AUTHORS` file is planned. - `./intern/opensubdiv/`. An "AUTHORS" file has been added, using the chromium projects authors file as a template. Design task: #110784 Ref !110783.
100 lines
3.3 KiB
C++
100 lines
3.3 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 "BLI_math_matrix.hh"
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#include "BKE_volume.h"
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#include "BKE_volume_openvdb.hh"
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#include "GEO_points_to_volume.hh"
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#ifdef WITH_OPENVDB
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# include <openvdb/openvdb.h>
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# include <openvdb/tools/LevelSetUtil.h>
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# include <openvdb/tools/ParticlesToLevelSet.h>
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namespace blender::geometry {
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/* Implements the interface required by #openvdb::tools::ParticlesToLevelSet. */
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struct OpenVDBParticleList {
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using PosType = openvdb::Vec3R;
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Span<float3> positions;
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Span<float> radii;
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size_t size() const
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{
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return size_t(positions.size());
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}
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void getPos(size_t n, openvdb::Vec3R &xyz) const
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{
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xyz = &positions[n].x;
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}
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void getPosRad(size_t n, openvdb::Vec3R &xyz, openvdb::Real &radius) const
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{
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xyz = &positions[n].x;
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radius = radii[n];
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}
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};
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static openvdb::FloatGrid::Ptr points_to_sdf_grid(const Span<float3> positions,
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const Span<float> radii)
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{
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/* Create a new grid that will be filled. #ParticlesToLevelSet requires
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* the background value to be positive */
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openvdb::FloatGrid::Ptr new_grid = openvdb::FloatGrid::create(1.0f);
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/* Create a narrow-band level set grid based on the positions and radii. */
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openvdb::tools::ParticlesToLevelSet op{*new_grid};
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/* Don't ignore particles based on their radius. */
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op.setRmin(0.0f);
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op.setRmax(FLT_MAX);
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OpenVDBParticleList particles{positions, radii};
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op.rasterizeSpheres(particles);
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op.finalize();
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return new_grid;
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}
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VolumeGrid *fog_volume_grid_add_from_points(Volume *volume,
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const StringRefNull name,
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const Span<float3> positions,
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const Span<float> radii,
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const float voxel_size,
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const float density)
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{
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openvdb::FloatGrid::Ptr new_grid = points_to_sdf_grid(positions, radii);
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new_grid->transform().postScale(voxel_size);
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new_grid->setGridClass(openvdb::GRID_FOG_VOLUME);
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/* Convert the level set to a fog volume. This also sets the background value to zero. Inside the
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* fog there will be a density of 1. */
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openvdb::tools::sdfToFogVolume(*new_grid);
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/* Take the desired density into account. */
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openvdb::tools::foreach (new_grid->beginValueOn(),
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[&](const openvdb::FloatGrid::ValueOnIter &iter) {
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iter.modifyValue([&](float &value) { value *= density; });
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});
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return BKE_volume_grid_add_vdb(*volume, name, std::move(new_grid));
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}
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VolumeGrid *sdf_volume_grid_add_from_points(Volume *volume,
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const StringRefNull name,
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const Span<float3> positions,
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const Span<float> radii,
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const float voxel_size)
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{
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openvdb::FloatGrid::Ptr new_grid = points_to_sdf_grid(positions, radii);
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new_grid->transform().postScale(voxel_size);
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new_grid->setGridClass(openvdb::GRID_LEVEL_SET);
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return BKE_volume_grid_add_vdb(*volume, name, std::move(new_grid));
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}
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} // namespace blender::geometry
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#endif
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