diff options
Diffstat (limited to 'source/blender/bmesh/operators/bmo_dissolve.c')
| -rw-r--r-- | source/blender/bmesh/operators/bmo_dissolve.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/source/blender/bmesh/operators/bmo_dissolve.c b/source/blender/bmesh/operators/bmo_dissolve.c index 60b96e35057..334242f3100 100644 --- a/source/blender/bmesh/operators/bmo_dissolve.c +++ b/source/blender/bmesh/operators/bmo_dissolve.c @@ -474,3 +474,144 @@ void bmo_dissolve_limit_exec(BMesh *bm, BMOperator *op) BMO_slot_buffer_from_enabled_flag(bm, op, op->slots_out, "region.out", BM_FACE, FACE_NEW); } + + +#define EDGE_MARK 1 +#define EDGE_COLLAPSE 2 + +static void bm_mesh_edge_collapse_flagged(BMesh *bm, const int flag, const short oflag) +{ + BMO_op_callf(bm, flag, "collapse edges=%fe", oflag); +} + +void bmo_dissolve_degenerate_exec(BMesh *bm, BMOperator *op) +{ + const float dist = BMO_slot_float_get(op->slots_in, "dist"); + const float dist_sq = dist * dist; + + bool found; + BMIter eiter; + BMEdge *e; + + + BMO_slot_buffer_flag_enable(bm, op->slots_in, "edges", BM_EDGE, EDGE_MARK); + + /* collapse zero length edges, this accounts for zero area faces too */ + found = false; + BM_ITER_MESH (e, &eiter, bm, BM_EDGES_OF_MESH) { + if (BMO_elem_flag_test(bm, e, EDGE_MARK)) { + if (BM_edge_calc_length_squared(e) < dist_sq) { + BMO_elem_flag_enable(bm, e, EDGE_COLLAPSE); + found = true; + } + } + + /* clear all loop tags (checked later) */ + if (e->l) { + BMLoop *l_iter, *l_first; + l_iter = l_first = e->l; + do { + BM_elem_flag_disable(l_iter, BM_ELEM_TAG); + } while ((l_iter = l_iter->radial_next) != l_first); + } + } + + if (found) { + bm_mesh_edge_collapse_flagged(bm, op->flag, EDGE_COLLAPSE); + } + + + /* clip degenerate ears from the face */ + found = false; + BM_ITER_MESH (e, &eiter, bm, BM_EDGES_OF_MESH) { + if (e->l && BMO_elem_flag_test(bm, e, EDGE_MARK)) { + BMLoop *l_iter, *l_first; + l_iter = l_first = e->l; + do { + if ( + /* check the loop hasn't already been tested (and flag not to test again) */ + !BM_elem_flag_test(l_iter, BM_ELEM_TAG) && + (BM_elem_flag_enable(l_iter, BM_ELEM_TAG), + + /* check we're marked to tested (radial edge already tested) */ + BMO_elem_flag_test(bm, l_iter->prev->e, EDGE_MARK) && + + /* check edges are not already going to be collapsed */ + !BMO_elem_flag_test(bm, l_iter->e, EDGE_COLLAPSE) && + !BMO_elem_flag_test(bm, l_iter->prev->e, EDGE_COLLAPSE))) + { + /* test if the faces loop (ear) is degenerate */ + float dir_prev[3], len_prev; + float dir_next[3], len_next; + + + sub_v3_v3v3(dir_prev, l_iter->prev->v->co, l_iter->v->co); + sub_v3_v3v3(dir_next, l_iter->next->v->co, l_iter->v->co); + + len_prev = normalize_v3(dir_prev); + len_next = normalize_v3(dir_next); + + if ((len_v3v3(dir_prev, dir_next) * min_ff(len_prev, len_next)) <= dist) { + bool reset = false; + + if (fabsf(len_prev - len_next) <= dist) { + /* both edges the same length */ + if (l_iter->f->len == 3) { + /* ideally this would have been discovered with short edge test above */ + BMO_elem_flag_enable(bm, l_iter->next->e, EDGE_COLLAPSE); + found = true; + } + else { + /* add a joining edge and tag for removal */ + BMLoop *l_split; + if (BM_face_split(bm, l_iter->f, l_iter->prev, l_iter->next, &l_split, NULL, true)) { + BMO_elem_flag_enable(bm, l_split->e, EDGE_COLLAPSE); + found = true; + reset = true; + } + } + } + else if (len_prev < len_next) { + /* split 'l_iter->e', then join the vert with next */ + BMVert *v_new; + BMEdge *e_new; + BMLoop *l_split; + v_new = BM_edge_split(bm, l_iter->e, l_iter->v, &e_new, len_prev / len_next); + BLI_assert(v_new == l_iter->next->v); + (void)v_new; + if (BM_face_split(bm, l_iter->f, l_iter->prev, l_iter->next, &l_split, NULL, true)) { + BMO_elem_flag_enable(bm, l_split->e, EDGE_COLLAPSE); + found = true; + } + reset = true; + } + else if (len_next < len_prev) { + /* split 'l_iter->prev->e', then join the vert with next */ + BMVert *v_new; + BMEdge *e_new; + BMLoop *l_split; + v_new = BM_edge_split(bm, l_iter->prev->e, l_iter->v, &e_new, len_next / len_prev); + BLI_assert(v_new == l_iter->prev->v); + (void)v_new; + if (BM_face_split(bm, l_iter->f, l_iter->prev, l_iter->next, &l_split, NULL, true)) { + BMO_elem_flag_enable(bm, l_split->e, EDGE_COLLAPSE); + found = true; + } + reset = true; + } + + if (reset) { + /* we can't easily track where we are on the radial edge, reset! */ + l_first = l_iter; + } + } + } + } while ((l_iter = l_iter->radial_next) != l_first); + } + } + + if (found) { + bm_mesh_edge_collapse_flagged(bm, op->flag, EDGE_COLLAPSE); + } + +} |