mesh.validate() / BKE_mesh_validate() --- functions now check for duplicate vertices used within the same polygon.

(which would crash otherwise)

1 files changed, 14 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/mesh_validate.c b/source/blender/blenkernel/intern/mesh_validate.c
index aebbcd4208d..446ad399e11 100644
--- a/source/blender/blenkernel/intern/mesh_validate.c
+++ b/source/blender/blenkernel/intern/mesh_validate.c
@@ -240,9 +240,23 @@ int BKE_mesh_validate_arrays(Mesh *mesh,
 						PRINT("    loop %u has invalid vert reference (%u)\n", sp->loopstart + j, ml->v);
 						sp->invalid = TRUE;
 					}
+
+					mverts[ml->v].flag |= ME_VERT_TMP_TAG;
 					*v = ml->v;
 				}
 
+				/* is the same vertex used more then once */
+				if (!sp->invalid) {
+					v = sp->verts;
+					for (j = 0; j < mp->totloop; j++, v++) {
+						if ((mverts[*v].flag & ME_VERT_TMP_TAG) == 0) {
+							PRINT("    poly %u has duplicate vert reference at corner (%u)\n", i, j);
+							sp->invalid = TRUE;
+						}
+						mverts[*v].flag &= ~ME_VERT_TMP_TAG;
+					}
+				}
+
 				if (sp->invalid)
 					continue;