/* from/to_world_space : whether from/to particles are in world or hair space
* from/to_mat : additional transform for from/to particles (e.g. for using object space copying)
*/
static bool remap_hair_emitter(Scene *scene, Object *ob, ParticleSystem *psys,
Object *target_ob, ParticleSystem *target_psys, PTCacheEdit *target_edit,
float from_mat[4][4], float to_mat[4][4], bool from_global, bool to_global)
{
ParticleSystemModifierData *target_psmd = psys_get_modifier(target_ob, target_psys);
ParticleData *pa, *tpa;
PTCacheEditPoint *edit_point;
PTCacheEditKey *ekey;
BVHTreeFromMesh bvhtree= {NULL};
MFace *mface = NULL, *mf;
MEdge *medge = NULL, *me;
MVert *mvert;
DerivedMesh *dm, *target_dm;
int numverts;
int i, k;
float from_ob_imat[4][4], to_ob_imat[4][4];
float from_imat[4][4], to_imat[4][4];
if (!target_psmd->dm)
return false;
if (!psys->part || psys->part->type != PART_HAIR)
return false;
if (!target_psys->part || target_psys->part->type != PART_HAIR)
return false;
edit_point = target_edit ? target_edit->points : NULL;
invert_m4_m4(from_ob_imat, ob->obmat);
invert_m4_m4(to_ob_imat, target_ob->obmat);
invert_m4_m4(from_imat, from_mat);
invert_m4_m4(to_imat, to_mat);
if (target_psmd->dm->deformedOnly) {
/* we don't want to mess up target_psmd->dm when converting to global coordinates below */
dm = target_psmd->dm;
}
else {
/* warning: this rebuilds target_psmd->dm! */
dm = mesh_get_derived_deform(scene, target_ob, CD_MASK_BAREMESH | CD_MASK_MFACE);
}
target_dm = target_psmd->dm;
/* don't modify the original vertices */
dm = CDDM_copy(dm);
/* BMESH_ONLY, deform dm may not have tessface */
DM_ensure_tessface(dm);
numverts = dm->getNumVerts(dm);
mvert = dm->getVertArray(dm);
/* convert to global coordinates */
for (i=0; i<numverts; i++)
mul_m4_v3(to_mat, mvert[i].co);
if (dm->getNumTessFaces(dm) != 0) {
mface = dm->getTessFaceArray(dm);
bvhtree_from_mesh_faces(&bvhtree, dm, 0.0, 2, 6);
}
else if (dm->getNumEdges(dm) != 0) {
medge = dm->getEdgeArray(dm);
bvhtree_from_mesh_edges(&bvhtree, dm, 0.0, 2, 6);
}
else {
dm->release(dm);
return false;
}
for (i = 0, tpa = target_psys->particles, pa = psys->particles;
i < target_psys->totpart;
i++, tpa++, pa++) {
float from_co[3];
BVHTreeNearest nearest;
if (from_global)
mul_v3_m4v3(from_co, from_ob_imat, pa->hair[0].co);
else
mul_v3_m4v3(from_co, from_ob_imat, pa->hair[0].world_co);
mul_m4_v3(from_mat, from_co);
nearest.index = -1;
nearest.dist_sq = FLT_MAX;
BLI_bvhtree_find_nearest(bvhtree.tree, from_co, &nearest, bvhtree.nearest_callback, &bvhtree);
if (nearest.index == -1) {
if (G.debug & G_DEBUG)
printf("No nearest point found for hair root!");
continue;
}
if (mface) {
float v[4][3];
mf = &mface[nearest.index];
copy_v3_v3(v[0], mvert[mf->v1].co);
copy_v3_v3(v[1], mvert[mf->v2].co);
copy_v3_v3(v[2], mvert[mf->v3].co);
if (mf->v4) {
copy_v3_v3(v[3], mvert[mf->v4].co);
interp_weights_poly_v3(tpa->fuv, v, 4, nearest.co);
}
else
interp_weights_poly_v3(tpa->fuv, v, 3, nearest.co);
tpa->foffset = 0.0f;
tpa->num = nearest.index;
tpa->num_dmcache = psys_particle_dm_face_lookup(target_ob, target_dm, tpa->num, tpa->fuv, NULL);
}
else {
me = &medge[nearest.index];
tpa->fuv[1] = line_point_factor_v3(nearest.co,
mvert[me->v1].co,
mvert[me->v2].co);
tpa->fuv[0] = 1.0f - tpa->fuv[1];
tpa->fuv[2] = tpa->fuv[3] = 0.0f;
tpa->foffset = 0.0f;
tpa->num = nearest.index;
tpa->num_dmcache = -1;
}
/* translate hair keys */
{
HairKey *key, *tkey;
float hairmat[4][4], imat[4][4];
float offset[3];
if (to_global)
copy_m4_m4(imat, target_ob->obmat);
else {
/* note: using target_dm here, which is in target_ob object space and has full modifiers */
psys_mat_hair_to_object(target_ob, target_dm, target_psys->part->from, tpa, hairmat);
invert_m4_m4(imat, hairmat);
}
mul_m4_m4m4(imat, imat, to_imat);
/* offset in world space */
sub_v3_v3v3(offset, nearest.co, from_co);
if (edit_point) {
for (k=0, key=pa->hair, tkey=tpa->hair, ekey = edit_point->keys; k<tpa->totkey; k++, key++, tkey++, ekey++) {
float co_orig[3];
if (from_global)
mul_v3_m4v3(co_orig, from_ob_imat, key->co);
else
mul_v3_m4v3(co_orig, from_ob_imat, key->world_co);
mul_m4_v3(from_mat, co_orig);
add_v3_v3v3(tkey->co, co_orig, offset);
mul_m4_v3(imat, tkey->co);
ekey->flag |= PEK_USE_WCO;
}
edit_point++;
}
else {
for (k=0, key=pa->hair, tkey=tpa->hair; k<tpa->totkey; k++, key++, tkey++) {
float co_orig[3];
if (from_global)
mul_v3_m4v3(co_orig, from_ob_imat, key->co);
else
mul_v3_m4v3(co_orig, from_ob_imat, key->world_co);
mul_m4_v3(from_mat, co_orig);
add_v3_v3v3(tkey->co, co_orig, offset);
mul_m4_v3(imat, tkey->co);
}
}
}
}
free_bvhtree_from_mesh(&bvhtree);
dm->release(dm);
psys_free_path_cache(target_psys, target_edit);
PE_update_object(scene, target_ob, 0);
return true;
}
static int connect_hair(Scene *scene, Object *ob, ParticleSystem *psys)
{
ParticleSystemModifierData *psmd = psys_get_modifier(ob, psys);
ParticleData *pa;
PTCacheEdit *edit;
PTCacheEditPoint *point;
PTCacheEditKey *ekey = NULL;
HairKey *key;
BVHTreeFromMesh bvhtree= {NULL};
BVHTreeNearest nearest;
MFace *mface, *mf;
MVert *mvert;
DerivedMesh *dm = NULL;
int numverts;
int i, k;
float hairmat[4][4], imat[4][4];
float v[4][3], vec[3];
if (!psys || !psys->part || psys->part->type != PART_HAIR || !psmd->dm)
return FALSE;
edit= psys->edit;
point= edit ? edit->points : NULL;
if (psmd->dm->deformedOnly) {
/* we don't want to mess up psmd->dm when converting to global coordinates below */
dm = psmd->dm;
}
else {
dm = mesh_get_derived_deform(scene, ob, CD_MASK_BAREMESH);
}
/* don't modify the original vertices */
dm = CDDM_copy(dm);
/* BMESH_ONLY, deform dm may not have tessface */
DM_ensure_tessface(dm);
numverts = dm->getNumVerts(dm);
mvert = dm->getVertArray(dm);
mface = dm->getTessFaceArray(dm);
/* convert to global coordinates */
for (i=0; i<numverts; i++)
mul_m4_v3(ob->obmat, mvert[i].co);
bvhtree_from_mesh_faces(&bvhtree, dm, 0.0, 2, 6);
for (i=0, pa= psys->particles; i<psys->totpart; i++, pa++) {
key = pa->hair;
nearest.index = -1;
nearest.dist = FLT_MAX;
BLI_bvhtree_find_nearest(bvhtree.tree, key->co, &nearest, bvhtree.nearest_callback, &bvhtree);
if (nearest.index == -1) {
if (G.debug & G_DEBUG)
printf("No nearest point found for hair root!");
continue;
}
mf = &mface[nearest.index];
copy_v3_v3(v[0], mvert[mf->v1].co);
copy_v3_v3(v[1], mvert[mf->v2].co);
copy_v3_v3(v[2], mvert[mf->v3].co);
if (mf->v4) {
copy_v3_v3(v[3], mvert[mf->v4].co);
interp_weights_poly_v3(pa->fuv, v, 4, nearest.co);
}
else
interp_weights_poly_v3(pa->fuv, v, 3, nearest.co);
pa->num = nearest.index;
pa->num_dmcache = psys_particle_dm_face_lookup(ob, psmd->dm, pa->num, pa->fuv, NULL);
psys_mat_hair_to_global(ob, psmd->dm, psys->part->from, pa, hairmat);
invert_m4_m4(imat, hairmat);
sub_v3_v3v3(vec, nearest.co, key->co);
if (point) {
ekey = point->keys;
point++;
}
for (k=0, key=pa->hair; k<pa->totkey; k++, key++) {
add_v3_v3(key->co, vec);
mul_m4_v3(imat, key->co);
if (ekey) {
ekey->flag |= PEK_USE_WCO;
ekey++;
}
}
}
free_bvhtree_from_mesh(&bvhtree);
dm->release(dm);
psys_free_path_cache(psys, psys->edit);
psys->flag &= ~PSYS_GLOBAL_HAIR;
PE_update_object(scene, ob, 0);
return TRUE;
}