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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2019 Blender Foundation. All rights reserved. */
#include "usd_writer_hair.h"
#include "usd_hierarchy_iterator.h"
#include <pxr/usd/usdGeom/basisCurves.h>
#include <pxr/usd/usdGeom/tokens.h>
#include "BKE_particle.h"
#include "DNA_particle_types.h"
namespace blender::io::usd {
USDHairWriter::USDHairWriter(const USDExporterContext &ctx) : USDAbstractWriter(ctx)
{
}
void USDHairWriter::do_write(HierarchyContext &context)
{
ParticleSystem *psys = context.particle_system;
ParticleCacheKey **cache = psys->pathcache;
if (cache == nullptr) {
return;
}
pxr::UsdTimeCode timecode = get_export_time_code();
pxr::UsdGeomBasisCurves curves = pxr::UsdGeomBasisCurves::Define(usd_export_context_.stage,
usd_export_context_.usd_path);
/* TODO(Sybren): deal with (psys->part->flag & PART_HAIR_BSPLINE) */
curves.CreateBasisAttr(pxr::VtValue(pxr::UsdGeomTokens->bspline));
curves.CreateTypeAttr(pxr::VtValue(pxr::UsdGeomTokens->cubic));
pxr::VtArray<pxr::GfVec3f> points;
pxr::VtIntArray curve_point_counts;
curve_point_counts.reserve(psys->totpart);
ParticleCacheKey *strand;
for (int strand_index = 0; strand_index < psys->totpart; ++strand_index) {
strand = cache[strand_index];
int point_count = strand->segments + 1;
curve_point_counts.push_back(point_count);
for (int point_index = 0; point_index < point_count; ++point_index, ++strand) {
points.push_back(pxr::GfVec3f(strand->co));
}
}
pxr::UsdAttribute attr_points = curves.CreatePointsAttr(pxr::VtValue(), true);
pxr::UsdAttribute attr_vertex_counts = curves.CreateCurveVertexCountsAttr(pxr::VtValue(), true);
if (!attr_points.HasValue()) {
attr_points.Set(points, pxr::UsdTimeCode::Default());
attr_vertex_counts.Set(curve_point_counts, pxr::UsdTimeCode::Default());
}
usd_value_writer_.SetAttribute(attr_points, pxr::VtValue(points), timecode);
usd_value_writer_.SetAttribute(attr_vertex_counts, pxr::VtValue(curve_point_counts), timecode);
if (psys->totpart > 0) {
pxr::VtArray<pxr::GfVec3f> colors;
colors.push_back(pxr::GfVec3f(cache[0]->col));
curves.CreateDisplayColorAttr(pxr::VtValue(colors));
}
}
bool USDHairWriter::check_is_animated(const HierarchyContext &UNUSED(context)) const
{
return true;
}
} // namespace blender::io::usd
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