[Bf-blender-cvs] [819152527fd] master: BMesh: assert that face normals have been updated for tessellation
Campbell Barton
noreply at git.blender.org
Tue Jun 15 06:55:30 CEST 2021
Commit: 819152527fd425fef54107bd6841887ace51e66e
Author: Campbell Barton
Date: Tue Jun 15 14:51:48 2021 +1000
Branches: master
https://developer.blender.org/rB819152527fd425fef54107bd6841887ace51e66e
BMesh: assert that face normals have been updated for tessellation
This catches missing normal updates that may cause invalid tessellation.
===================================================================
M source/blender/bmesh/intern/bmesh_mesh_tessellate.c
===================================================================
diff --git a/source/blender/bmesh/intern/bmesh_mesh_tessellate.c b/source/blender/bmesh/intern/bmesh_mesh_tessellate.c
index ca1218c97f6..2f9d5758385 100644
--- a/source/blender/bmesh/intern/bmesh_mesh_tessellate.c
+++ b/source/blender/bmesh/intern/bmesh_mesh_tessellate.c
@@ -58,6 +58,13 @@ BLI_INLINE void mesh_calc_tessellation_for_face_impl(BMLoop *(*looptris)[3],
MemArena **pf_arena_p,
const bool face_normal)
{
+#ifdef DEBUG
+ /* The face normal is used for projecting faces into 2D space for tessellation.
+ * Invalid normals may result in invalid tessellation.
+ * Either `face_normal` should be true or normals should be updated first. */
+ BLI_assert(face_normal || BM_face_is_normal_valid(efa));
+#endif
+
switch (efa->len) {
case 3: {
/* `0 1 2` -> `0 1 2` */
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