source/blender/alembic/intern/abc_hair.cc

   1 /*
   2  * ***** BEGIN GPL LICENSE BLOCK *****
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  *
  18  * Contributor(s): Esteban Tovagliari, Cedric Paille, Kevin Dietrich
  19  *
  20  * ***** END GPL LICENSE BLOCK *****
  21  */
  22
  23 #include "abc_hair.h"
  24
  25 #include <cstdio>
  26
  27 #include "abc_transform.h"
  28 #include "abc_util.h"
  29
  30 extern "C" {
  31 #include "MEM_guardedalloc.h"
  32
  33 #include "DNA_modifier_types.h"
  34
  35 #include "BLI_listbase.h"
  36 #include "BLI_math_geom.h"
  37
  38 #include "BKE_DerivedMesh.h"
  39 #include "BKE_object.h"
  40 #include "BKE_particle.h"
  41 }
  42
  43 using Alembic::Abc::P3fArraySamplePtr;
  44
  45 using Alembic::AbcGeom::OCurves;
  46 using Alembic::AbcGeom::OCurvesSchema;
  47 using Alembic::AbcGeom::ON3fGeomParam;
  48 using Alembic::AbcGeom::OV2fGeomParam;
  49
  50 /* ************************************************************************** */
  51
  52 AbcHairWriter::AbcHairWriter(Scene *scene,
  53                              Object *ob,
  54                              AbcTransformWriter *parent,
  55                              uint32_t time_sampling,
  56                              ExportSettings &settings,
  57                              ParticleSystem *psys)
  58     : AbcObjectWriter(scene, ob, time_sampling, settings, parent)
  59 {
  60         m_psys = psys;
  61
  62         OCurves curves(parent->alembicXform(), psys->name, m_time_sampling);
  63         m_schema = curves.getSchema();
  64 }
  65
  66 void AbcHairWriter::do_write()
  67 {
  68         if (!m_psys) {
  69                 return;
  70         }
  71
  72         ParticleSystemModifierData *psmd = psys_get_modifier(m_object, m_psys);
  73
  74         if (!psmd->dm_final) {
  75                 return;
  76         }
  77
  78         DerivedMesh *dm = mesh_create_derived_view(m_scene, m_object, CD_MASK_MESH);
  79         DM_ensure_tessface(dm);
  80
  81         std::vector<Imath::V3f> verts;
  82         std::vector<int32_t> hvertices;
  83         std::vector<Imath::V2f> uv_values;
  84         std::vector<Imath::V3f> norm_values;
  85
  86         if (m_psys->pathcache) {
  87                 ParticleSettings *part = m_psys->part;
  88
  89                 write_hair_sample(dm, part, verts, norm_values, uv_values, hvertices);
  90
  91                 if (m_settings.export_child_hairs && m_psys->childcache) {
  92                         write_hair_child_sample(dm, part, verts, norm_values, uv_values, hvertices);
  93                 }
  94         }
  95
  96         dm->release(dm);
  97
  98         Alembic::Abc::P3fArraySample iPos(verts);
  99         m_sample = OCurvesSchema::Sample(iPos, hvertices);
 100         m_sample.setBasis(Alembic::AbcGeom::kNoBasis);
 101         m_sample.setType(Alembic::AbcGeom::kLinear);
 102         m_sample.setWrap(Alembic::AbcGeom::kNonPeriodic);
 103
 104         if (!uv_values.empty()) {
 105                 OV2fGeomParam::Sample uv_smp;
 106                 uv_smp.setVals(uv_values);
 107                 m_sample.setUVs(uv_smp);
 108         }
 109
 110         if (!norm_values.empty()) {
 111                 ON3fGeomParam::Sample norm_smp;
 112                 norm_smp.setVals(norm_values);
 113                 m_sample.setNormals(norm_smp);
 114         }
 115
 116         m_sample.setSelfBounds(bounds());
 117         m_schema.set(m_sample);
 118 }
 119
 120 void AbcHairWriter::write_hair_sample(DerivedMesh *dm,
 121                                       ParticleSettings *part,
 122                                       std::vector<Imath::V3f> &verts,
 123                                       std::vector<Imath::V3f> &norm_values,
 124                                       std::vector<Imath::V2f> &uv_values,
 125                                       std::vector<int32_t> &hvertices)
 126 {
 127         /* Get untransformed vertices, there's a xform under the hair. */
 128         float inv_mat[4][4];
 129         invert_m4_m4_safe(inv_mat, m_object->obmat);
 130
 131         MTFace *mtface = static_cast<MTFace *>(CustomData_get_layer(&dm->faceData, CD_MTFACE));
 132         MFace *mface = dm->getTessFaceArray(dm);
 133         MVert *mverts = dm->getVertArray(dm);
 134
 135         if (!mtface || !mface) {
 136                 std::fprintf(stderr, "Warning, no UV set found for underlying geometry.\n");
 137         }
 138
 139         ParticleData * pa = m_psys->particles;
 140         int k;
 141
 142         ParticleCacheKey **cache = m_psys->pathcache;
 143         ParticleCacheKey *path;
 144         float normal[3];
 145         Imath::V3f tmp_nor;
 146
 147         for (int p = 0; p < m_psys->totpart; ++p, ++pa) {
 148                 /* underlying info for faces-only emission */
 149                 path = cache[p];
 150
 151                 if (part->from == PART_FROM_FACE && mtface) {
 152                         const int num = pa->num_dmcache >= 0 ? pa->num_dmcache : pa->num;
 153
 154                         if (num < dm->getNumTessFaces(dm)) {
 155                                 MFace *face = static_cast<MFace *>(dm->getTessFaceData(dm, num, CD_MFACE));
 156                                 MTFace *tface = mtface + num;
 157
 158                                 if (mface) {
 159                                         float r_uv[2], mapfw[4], vec[3];
 160
 161                                         psys_interpolate_uvs(tface, face->v4, pa->fuv, r_uv);
 162                                         uv_values.push_back(Imath::V2f(r_uv[0], r_uv[1]));
 163
 164                                         psys_interpolate_face(mverts, face, tface, NULL, mapfw, vec, normal, NULL, NULL, NULL, NULL);
 165
 166                                         copy_yup_from_zup(tmp_nor.getValue(), normal);
 167                                         norm_values.push_back(tmp_nor);
 168                                 }
 169                         }
 170                         else {
 171                                 std::fprintf(stderr, "Particle to faces overflow (%d/%d)\n", num, dm->getNumTessFaces(dm));
 172                         }
 173                 }
 174                 else if (part->from == PART_FROM_VERT && mtface) {
 175                         /* vertex id */
 176                         const int num = (pa->num_dmcache >= 0) ? pa->num_dmcache : pa->num;
 177
 178                         /* iterate over all faces to find a corresponding underlying UV */
 179                         for (int n = 0; n < dm->getNumTessFaces(dm); ++n) {
 180                                 MFace *face  = static_cast<MFace *>(dm->getTessFaceData(dm, n, CD_MFACE));
 181                                 MTFace *tface = mtface + n;
 182                                 unsigned int vtx[4];
 183                                 vtx[0] = face->v1;
 184                                 vtx[1] = face->v2;
 185                                 vtx[2] = face->v3;
 186                                 vtx[3] = face->v4;
 187                                 bool found = false;
 188
 189                                 for (int o = 0; o < 4; ++o) {
 190                                         if (o > 2 && vtx[o] == 0) {
 191                                                 break;
 192                                         }
 193
 194                                         if (vtx[o] == num) {
 195                                                 uv_values.push_back(Imath::V2f(tface->uv[o][0], tface->uv[o][1]));
 196
 197                                                 MVert *mv = mverts + vtx[o];
 198
 199                                                 normal_short_to_float_v3(normal, mv->no);
 200                                                 copy_yup_from_zup(tmp_nor.getValue(), normal);
 201                                                 norm_values.push_back(tmp_nor);
 202                                                 found = true;
 203                                                 break;
 204                                         }
 205                                 }
 206
 207                                 if (found) {
 208                                         break;
 209                                 }
 210                         }
 211                 }
 212
 213                 int steps = path->segments + 1;
 214                 hvertices.push_back(steps);
 215
 216                 for (k = 0; k < steps; ++k) {
 217                         float vert[3];
 218                         copy_v3_v3(vert, path->co);
 219                         mul_m4_v3(inv_mat, vert);
 220
 221                         /* Convert Z-up to Y-up. */
 222                         verts.push_back(Imath::V3f(vert[0], vert[2], -vert[1]));
 223
 224                         ++path;
 225                 }
 226         }
 227 }
 228
 229 void AbcHairWriter::write_hair_child_sample(DerivedMesh *dm,
 230                                             ParticleSettings *part,
 231                                             std::vector<Imath::V3f> &verts,
 232                                             std::vector<Imath::V3f> &norm_values,
 233                                             std::vector<Imath::V2f> &uv_values,
 234                                             std::vector<int32_t> &hvertices)
 235 {
 236         /* Get untransformed vertices, there's a xform under the hair. */
 237         float inv_mat[4][4];
 238         invert_m4_m4_safe(inv_mat, m_object->obmat);
 239
 240         MTFace *mtface = static_cast<MTFace *>(CustomData_get_layer(&dm->faceData, CD_MTFACE));
 241         MFace *mface = dm->getTessFaceArray(dm);
 242         MVert *mverts = dm->getVertArray(dm);
 243
 244         if (!mtface || !mface) {
 245                 std::fprintf(stderr, "Warning, no UV set found for underlying geometry.\n");
 246         }
 247
 248         ParticleCacheKey **cache = m_psys->childcache;
 249         ParticleCacheKey *path;
 250
 251         ChildParticle *pc = m_psys->child;
 252
 253         for (int p = 0; p < m_psys->totchild; ++p, ++pc) {
 254                 path = cache[p];
 255
 256                 if (part->from == PART_FROM_FACE) {
 257                         const int num = pc->num;
 258
 259                         MFace *face = static_cast<MFace *>(dm->getTessFaceData(dm, num, CD_MFACE));
 260                         MTFace *tface = mtface + num;
 261
 262                         if (mface && mtface) {
 263                                 float r_uv[2], tmpnor[3], mapfw[4], vec[3];
 264
 265                                 psys_interpolate_uvs(tface, face->v4, pc->fuv, r_uv);
 266                                 uv_values.push_back(Imath::V2f(r_uv[0], r_uv[1]));
 267
 268                                 psys_interpolate_face(mverts, face, tface, NULL, mapfw, vec, tmpnor, NULL, NULL, NULL, NULL);
 269
 270                                 /* Convert Z-up to Y-up. */
 271                                 norm_values.push_back(Imath::V3f(tmpnor[0], tmpnor[2], -tmpnor[1]));
 272                         }
 273                 }
 274
 275                 int steps = path->segments + 1;
 276                 hvertices.push_back(steps);
 277
 278                 for (int k = 0; k < steps; ++k) {
 279                         float vert[3];
 280                         copy_v3_v3(vert, path->co);
 281                         mul_m4_v3(inv_mat, vert);
 282
 283                         /* Convert Z-up to Y-up. */
 284                         verts.push_back(Imath::V3f(vert[0], vert[2], -vert[1]));
 285
 286                         ++path;
 287                 }
 288         }
 289 }