diff options
Diffstat (limited to 'source/blender/bmesh/intern/bmesh_queries.c')
| -rw-r--r-- | source/blender/bmesh/intern/bmesh_queries.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/source/blender/bmesh/intern/bmesh_queries.c b/source/blender/bmesh/intern/bmesh_queries.c index 09cd6a2f96b..3561092b1cf 100644 --- a/source/blender/bmesh/intern/bmesh_queries.c +++ b/source/blender/bmesh/intern/bmesh_queries.c @@ -309,6 +309,59 @@ BMVert *BM_edge_other_vert(BMEdge *e, BMVert *v) } /** + * The function takes a vertex at the center of a fan and returns the opposite edge in the fan. + * All edges in the fan must be manifold, otherwise return NULL. + * + * \note This could (probably) be done more effieiently. + */ +BMEdge *BM_vert_other_disk_edge(BMVert *v, BMEdge *e_first) +{ + BMLoop *l_a; + int tot = 0; + int i; + + BLI_assert(BM_vert_in_edge(e_first, v)); + + l_a = e_first->l; + do { + l_a = BM_loop_other_vert_loop(l_a, v); + l_a = BM_vert_in_edge(l_a->e, v) ? l_a : l_a->prev; + if (BM_edge_is_manifold(l_a->e)) { + l_a = l_a->radial_next; + } + else { + return NULL; + } + + tot++; + } while (l_a != e_first->l); + + /* we know the total, now loop half way */ + tot /= 2; + i = 0; + + l_a = e_first->l; + do { + if (i == tot) { + l_a = BM_vert_in_edge(l_a->e, v) ? l_a : l_a->prev; + return l_a->e; + } + + l_a = BM_loop_other_vert_loop(l_a, v); + l_a = BM_vert_in_edge(l_a->e, v) ? l_a : l_a->prev; + if (BM_edge_is_manifold(l_a->e)) { + l_a = l_a->radial_next; + } + /* this wont have changed from the previous loop */ + + + i++; + } while (l_a != e_first->l); + + return NULL; +} + +/** * Returms edge length */ float BM_edge_length_calc(BMEdge *e) |