bmesh edge rotate

* improve check to see if edge rotate can be done,
  was checking if both edges verts have an edge count of 2, which is really a meaningless test since the verts can have stray edges connected and the result wont work right.
  instead check if the next verts in both faces share a vertex.

* add utility function BM_face_other_vert_loop() which gets the next loop in a face.
* add convenience function BM_edge_face_pair() which returns 2 faces for edges that have exactly 2 face users. (saves ugly e->l->radial_next ... in code) and is more readable.

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/bmesh/intern/bmesh_mods.h b/source/blender/bmesh/intern/bmesh_mods.h
index 6d4b1333549..d530e9d8666 100644
--- a/source/blender/bmesh/intern/bmesh_mods.h
+++ b/source/blender/bmesh/intern/bmesh_mods.h
@@ -53,6 +53,7 @@ BMVert *BM_edge_split_n(BMesh *bm, BMEdge *e, int numcuts);
 
 int     BM_face_validate(BMesh *bm, BMFace *face, FILE *err);
 
+int     BM_edge_rotate_check(BMesh *UNUSED(bm), BMEdge *e);
 BMEdge *BM_edge_rotate(BMesh *bm, BMEdge *e, int ccw);
 
 BMVert *BM_vert_rip(BMesh *bm, BMFace *sf, BMVert *sv);