c1bc70b711
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Foundation
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
|
|
#include "BLI_math_matrix.hh"
|
|
|
|
#include "BKE_volume.h"
|
|
|
|
#include "GEO_points_to_volume.hh"
|
|
|
|
#ifdef WITH_OPENVDB
|
|
# include <openvdb/openvdb.h>
|
|
# include <openvdb/tools/LevelSetUtil.h>
|
|
# include <openvdb/tools/ParticlesToLevelSet.h>
|
|
|
|
namespace blender::geometry {
|
|
|
|
/* Implements the interface required by #openvdb::tools::ParticlesToLevelSet. */
|
|
struct OpenVDBParticleList {
|
|
using PosType = openvdb::Vec3R;
|
|
|
|
Span<float3> positions;
|
|
Span<float> radii;
|
|
|
|
size_t size() const
|
|
{
|
|
return size_t(positions.size());
|
|
}
|
|
|
|
void getPos(size_t n, openvdb::Vec3R &xyz) const
|
|
{
|
|
xyz = &positions[n].x;
|
|
}
|
|
|
|
void getPosRad(size_t n, openvdb::Vec3R &xyz, openvdb::Real &radius) const
|
|
{
|
|
xyz = &positions[n].x;
|
|
radius = radii[n];
|
|
}
|
|
};
|
|
|
|
static openvdb::FloatGrid::Ptr points_to_sdf_grid(const Span<float3> positions,
|
|
const Span<float> radii)
|
|
{
|
|
/* Create a new grid that will be filled. #ParticlesToLevelSet requires
|
|
* the background value to be positive */
|
|
openvdb::FloatGrid::Ptr new_grid = openvdb::FloatGrid::create(1.0f);
|
|
|
|
/* Create a narrow-band level set grid based on the positions and radii. */
|
|
openvdb::tools::ParticlesToLevelSet op{*new_grid};
|
|
/* Don't ignore particles based on their radius. */
|
|
op.setRmin(0.0f);
|
|
op.setRmax(FLT_MAX);
|
|
OpenVDBParticleList particles{positions, radii};
|
|
op.rasterizeSpheres(particles);
|
|
op.finalize();
|
|
|
|
return new_grid;
|
|
}
|
|
|
|
VolumeGrid *fog_volume_grid_add_from_points(Volume *volume,
|
|
const StringRefNull name,
|
|
const Span<float3> positions,
|
|
const Span<float> radii,
|
|
const float voxel_size,
|
|
const float density)
|
|
{
|
|
openvdb::FloatGrid::Ptr new_grid = points_to_sdf_grid(positions, radii);
|
|
new_grid->transform().postScale(voxel_size);
|
|
new_grid->setGridClass(openvdb::GRID_FOG_VOLUME);
|
|
|
|
/* Convert the level set to a fog volume. This also sets the background value to zero. Inside the
|
|
* fog there will be a density of 1. */
|
|
openvdb::tools::sdfToFogVolume(*new_grid);
|
|
|
|
/* Take the desired density into account. */
|
|
openvdb::tools::foreach (new_grid->beginValueOn(),
|
|
[&](const openvdb::FloatGrid::ValueOnIter &iter) {
|
|
iter.modifyValue([&](float &value) { value *= density; });
|
|
});
|
|
|
|
return BKE_volume_grid_add_vdb(*volume, name, std::move(new_grid));
|
|
}
|
|
|
|
VolumeGrid *sdf_volume_grid_add_from_points(Volume *volume,
|
|
const StringRefNull name,
|
|
const Span<float3> positions,
|
|
const Span<float> radii,
|
|
const float voxel_size)
|
|
{
|
|
openvdb::FloatGrid::Ptr new_grid = points_to_sdf_grid(positions, radii);
|
|
new_grid->transform().postScale(voxel_size);
|
|
new_grid->setGridClass(openvdb::GRID_LEVEL_SET);
|
|
|
|
return BKE_volume_grid_add_vdb(*volume, name, std::move(new_grid));
|
|
}
|
|
} // namespace blender::geometry
|
|
#endif
|