diff options
Diffstat (limited to 'source/blender/io/alembic/intern/abc_writer_hair.cc')
-rw-r--r-- | source/blender/io/alembic/intern/abc_writer_hair.cc | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/source/blender/io/alembic/intern/abc_writer_hair.cc b/source/blender/io/alembic/intern/abc_writer_hair.cc new file mode 100644 index 00000000000..bbba03ed7f4 --- /dev/null +++ b/source/blender/io/alembic/intern/abc_writer_hair.cc @@ -0,0 +1,292 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/** \file + * \ingroup balembic + */ + +#include "abc_writer_hair.h" +#include "abc_writer_transform.h" +#include "abc_util.h" + +#include <cstdio> + +extern "C" { +#include "DNA_mesh_types.h" +#include "DNA_meshdata_types.h" +#include "DNA_modifier_types.h" +#include "DNA_object_types.h" + +#include "BLI_math_geom.h" + +#include "BKE_mesh.h" +#include "BKE_mesh_runtime.h" +#include "BKE_particle.h" +} + +using Alembic::Abc::P3fArraySamplePtr; + +using Alembic::AbcGeom::OCurves; +using Alembic::AbcGeom::OCurvesSchema; +using Alembic::AbcGeom::ON3fGeomParam; +using Alembic::AbcGeom::OV2fGeomParam; + +/* ************************************************************************** */ + +AbcHairWriter::AbcHairWriter(Object *ob, + AbcTransformWriter *parent, + uint32_t time_sampling, + ExportSettings &settings, + ParticleSystem *psys) + : AbcObjectWriter(ob, time_sampling, settings, parent), m_uv_warning_shown(false) +{ + m_psys = psys; + + OCurves curves(parent->alembicXform(), psys->name, m_time_sampling); + m_schema = curves.getSchema(); +} + +void AbcHairWriter::do_write() +{ + if (!m_psys) { + return; + } + Mesh *mesh = mesh_get_eval_final( + m_settings.depsgraph, m_settings.scene, m_object, &CD_MASK_MESH); + BKE_mesh_tessface_ensure(mesh); + + std::vector<Imath::V3f> verts; + std::vector<int32_t> hvertices; + std::vector<Imath::V2f> uv_values; + std::vector<Imath::V3f> norm_values; + + if (m_psys->pathcache) { + ParticleSettings *part = m_psys->part; + bool export_children = m_settings.export_child_hairs && m_psys->childcache && + part->childtype != 0; + + if (!export_children || part->draw & PART_DRAW_PARENT) { + write_hair_sample(mesh, part, verts, norm_values, uv_values, hvertices); + } + + if (export_children) { + write_hair_child_sample(mesh, part, verts, norm_values, uv_values, hvertices); + } + } + + Alembic::Abc::P3fArraySample iPos(verts); + m_sample = OCurvesSchema::Sample(iPos, hvertices); + m_sample.setBasis(Alembic::AbcGeom::kNoBasis); + m_sample.setType(Alembic::AbcGeom::kLinear); + m_sample.setWrap(Alembic::AbcGeom::kNonPeriodic); + + if (!uv_values.empty()) { + OV2fGeomParam::Sample uv_smp; + uv_smp.setVals(uv_values); + m_sample.setUVs(uv_smp); + } + + if (!norm_values.empty()) { + ON3fGeomParam::Sample norm_smp; + norm_smp.setVals(norm_values); + m_sample.setNormals(norm_smp); + } + + m_sample.setSelfBounds(bounds()); + m_schema.set(m_sample); +} + +void AbcHairWriter::write_hair_sample(Mesh *mesh, + ParticleSettings *part, + std::vector<Imath::V3f> &verts, + std::vector<Imath::V3f> &norm_values, + std::vector<Imath::V2f> &uv_values, + std::vector<int32_t> &hvertices) +{ + /* Get untransformed vertices, there's a xform under the hair. */ + float inv_mat[4][4]; + invert_m4_m4_safe(inv_mat, m_object->obmat); + + MTFace *mtface = mesh->mtface; + MFace *mface = mesh->mface; + MVert *mverts = mesh->mvert; + + if ((!mtface || !mface) && !m_uv_warning_shown) { + std::fprintf(stderr, + "Warning, no UV set found for underlying geometry of %s.\n", + m_object->id.name + 2); + m_uv_warning_shown = true; + } + + ParticleData *pa = m_psys->particles; + int k; + + ParticleCacheKey **cache = m_psys->pathcache; + ParticleCacheKey *path; + float normal[3]; + Imath::V3f tmp_nor; + + for (int p = 0; p < m_psys->totpart; p++, pa++) { + /* underlying info for faces-only emission */ + path = cache[p]; + + /* Write UV and normal vectors */ + if (part->from == PART_FROM_FACE && mtface) { + const int num = pa->num_dmcache >= 0 ? pa->num_dmcache : pa->num; + + if (num < mesh->totface) { + /* TODO(Sybren): check whether the NULL check here and if(mface) are actually required */ + MFace *face = mface == NULL ? NULL : &mface[num]; + MTFace *tface = mtface + num; + + if (mface) { + float r_uv[2], mapfw[4], vec[3]; + + psys_interpolate_uvs(tface, face->v4, pa->fuv, r_uv); + uv_values.push_back(Imath::V2f(r_uv[0], r_uv[1])); + + psys_interpolate_face(mverts, face, tface, NULL, mapfw, vec, normal, NULL, NULL, NULL); + + copy_yup_from_zup(tmp_nor.getValue(), normal); + norm_values.push_back(tmp_nor); + } + } + else { + std::fprintf(stderr, "Particle to faces overflow (%d/%d)\n", num, mesh->totface); + } + } + else if (part->from == PART_FROM_VERT && mtface) { + /* vertex id */ + const int num = (pa->num_dmcache >= 0) ? pa->num_dmcache : pa->num; + + /* iterate over all faces to find a corresponding underlying UV */ + for (int n = 0; n < mesh->totface; n++) { + MFace *face = &mface[n]; + MTFace *tface = mtface + n; + unsigned int vtx[4]; + vtx[0] = face->v1; + vtx[1] = face->v2; + vtx[2] = face->v3; + vtx[3] = face->v4; + bool found = false; + + for (int o = 0; o < 4; o++) { + if (o > 2 && vtx[o] == 0) { + break; + } + + if (vtx[o] == num) { + uv_values.push_back(Imath::V2f(tface->uv[o][0], tface->uv[o][1])); + + MVert *mv = mverts + vtx[o]; + + normal_short_to_float_v3(normal, mv->no); + copy_yup_from_zup(tmp_nor.getValue(), normal); + norm_values.push_back(tmp_nor); + found = true; + break; + } + } + + if (found) { + break; + } + } + } + + int steps = path->segments + 1; + hvertices.push_back(steps); + + for (k = 0; k < steps; k++, path++) { + float vert[3]; + copy_v3_v3(vert, path->co); + mul_m4_v3(inv_mat, vert); + + /* Convert Z-up to Y-up. */ + verts.push_back(Imath::V3f(vert[0], vert[2], -vert[1])); + } + } +} + +void AbcHairWriter::write_hair_child_sample(Mesh *mesh, + ParticleSettings *part, + std::vector<Imath::V3f> &verts, + std::vector<Imath::V3f> &norm_values, + std::vector<Imath::V2f> &uv_values, + std::vector<int32_t> &hvertices) +{ + /* Get untransformed vertices, there's a xform under the hair. */ + float inv_mat[4][4]; + invert_m4_m4_safe(inv_mat, m_object->obmat); + + MTFace *mtface = mesh->mtface; + MVert *mverts = mesh->mvert; + + ParticleCacheKey **cache = m_psys->childcache; + ParticleCacheKey *path; + + ChildParticle *pc = m_psys->child; + + for (int p = 0; p < m_psys->totchild; p++, pc++) { + path = cache[p]; + + if (part->from == PART_FROM_FACE && part->childtype != PART_CHILD_PARTICLES && mtface) { + const int num = pc->num; + if (num < 0) { + ABC_LOG(m_settings.logger) + << "Warning, child particle of hair system " << m_psys->name + << " has unknown face index of geometry of " << (m_object->id.name + 2) + << ", skipping child hair." << std::endl; + continue; + } + + MFace *face = &mesh->mface[num]; + MTFace *tface = mtface + num; + + float r_uv[2], tmpnor[3], mapfw[4], vec[3]; + + psys_interpolate_uvs(tface, face->v4, pc->fuv, r_uv); + uv_values.push_back(Imath::V2f(r_uv[0], r_uv[1])); + + psys_interpolate_face(mverts, face, tface, NULL, mapfw, vec, tmpnor, NULL, NULL, NULL); + + /* Convert Z-up to Y-up. */ + norm_values.push_back(Imath::V3f(tmpnor[0], tmpnor[2], -tmpnor[1])); + } + else { + if (uv_values.size()) { + uv_values.push_back(uv_values[pc->parent]); + } + if (norm_values.size()) { + norm_values.push_back(norm_values[pc->parent]); + } + } + + int steps = path->segments + 1; + hvertices.push_back(steps); + + for (int k = 0; k < steps; k++) { + float vert[3]; + copy_v3_v3(vert, path->co); + mul_m4_v3(inv_mat, vert); + + /* Convert Z-up to Y-up. */ + verts.push_back(Imath::V3f(vert[0], vert[2], -vert[1])); + + path++; + } + } +} |