diff options
| -rw-r--r-- | source/blender/editors/transform/transform_convert_mesh.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/source/blender/editors/transform/transform_convert_mesh.c b/source/blender/editors/transform/transform_convert_mesh.c index 289057b612e..451903f1857 100644 --- a/source/blender/editors/transform/transform_convert_mesh.c +++ b/source/blender/editors/transform/transform_convert_mesh.c @@ -51,6 +51,8 @@ /* Own include. */ #include "transform_convert.h" +#define USE_FACE_SUBSTITUTE + /* -------------------------------------------------------------------- */ /** \name Island Creation * @@ -1020,6 +1022,77 @@ static void mesh_customdatacorrect_free_cb(struct TransInfo *UNUSED(t), custom_data->data = NULL; } +#ifdef USE_FACE_SUBSTITUTE + +# define FACE_SUBSTITUTE_INDEX INT_MIN + +/* Search for a neighboring face with area and preferably without selected vertex. + * Used to replace arealess faces in customdata correction. */ +static BMFace *mesh_customdatacorrect_find_best_face_substitute(BMFace *f) +{ + BMFace *best_face = NULL; + BMLoop *l; + BMIter liter; + BM_ITER_ELEM (l, &liter, f, BM_LOOPS_OF_FACE) { + BMLoop *l_radial_next = l->radial_next; + BMFace *f_test = l_radial_next->f; + if (f_test == f) { + continue; + } + if (is_zero_v3(f_test->no)) { + continue; + } + + /* Check the loops edge isn't selected. */ + if (!BM_elem_flag_test(l_radial_next->v, BM_ELEM_SELECT) && + !BM_elem_flag_test(l_radial_next->next->v, BM_ELEM_SELECT)) { + /* Prefer edges with unselected vertices. + * Useful for extrude. */ + best_face = f_test; + break; + } + if (best_face == NULL) { + best_face = f_test; + } + } + return best_face; +} + +static void mesh_customdatacorrect_face_substitute_set(struct TransCustomDataLayer *tcld, + BMFace *f, + BMFace *f_copy) +{ + BLI_assert(is_zero_v3(f->no)); + BMesh *bm = tcld->bm; + /* It is impossible to calculate the loops weights of a face without area. + * Find a substitute. */ + BMFace *f_substitute = mesh_customdatacorrect_find_best_face_substitute(f); + if (f_substitute) { + /* Copy the custom-data from the substitute face. */ + BMLoop *l_iter, *l_first; + l_iter = l_first = BM_FACE_FIRST_LOOP(f); + do { + BM_loop_interp_from_face(bm, l_iter, f_substitute, false, false); + } while ((l_iter = l_iter->next) != l_first); + + /* Use the substitute face as the reference during the transformation. */ + BMFace *f_substitute_copy = BM_face_copy(tcld->bm_origfaces, bm, f_substitute, true, true); + + /* Hack: reference substitute face in `f_copy->no`. + * `tcld->origfaces` is already used to restore the initial value. */ + BM_elem_index_set(f_copy, FACE_SUBSTITUTE_INDEX); + *((BMFace **)&f_copy->no[0]) = f_substitute_copy; + } +} + +static BMFace *mesh_customdatacorrect_face_substitute_get(BMFace *f_copy) +{ + BLI_assert(BM_elem_index_get(f_copy) == FACE_SUBSTITUTE_INDEX); + return *((BMFace **)&f_copy->no[0]); +} + +#endif /* USE_FACE_SUBSTITUTE */ + static void mesh_customdatacorrect_init_vert(struct TransCustomDataLayer *tcld, BMVert *v, const int index) @@ -1042,6 +1115,11 @@ static void mesh_customdatacorrect_init_vert(struct TransCustomDataLayer *tcld, if (!BLI_ghash_ensure_p(tcld->origfaces, l->f, &val_p)) { BMFace *f_copy = BM_face_copy(tcld->bm_origfaces, bm, l->f, true, true); *val_p = f_copy; +#ifdef USE_FACE_SUBSTITUTE + if (is_zero_v3(l->f->no)) { + mesh_customdatacorrect_face_substitute_set(tcld, l->f, f_copy); + } +#endif } if (tcld->use_merge_group) { @@ -1256,6 +1334,14 @@ static void mesh_customdatacorrect_apply_vert(struct TransCustomDataLayer *tcld, f_copy = BLI_ghash_lookup(tcld->origfaces, l->f); +#ifdef USE_FACE_SUBSTITUTE + /* In some faces it is not possible to calculate interpolation, + * so we use a substitute. */ + if (BM_elem_index_get(f_copy) == FACE_SUBSTITUTE_INDEX) { + f_copy = mesh_customdatacorrect_face_substitute_get(f_copy); + } +#endif + /* only loop data, no vertex data since that contains shape keys, * and we do not want to mess up other shape keys */ BM_loop_interp_from_face(bm, l, f_copy, false, false); |