Added three more cases for allowing to create a new quad (Fkey), based on

inverting the checked triangle diagonal.
Noticed issues while modeling subsurfs yesterday, in that case you can
really be less strict.

1 files changed, 11 insertions, 1 deletions

diff --git a/source/blender/src/editmesh_add.c b/source/blender/src/editmesh_add.c
index 13860329cf7..6e82e82134e 100644
--- a/source/blender/src/editmesh_add.c
+++ b/source/blender/src/editmesh_add.c
@@ -633,7 +633,7 @@ void addedgeface_mesh(void)
 				/* if 4 edges exist, we just create the face, convex or not */
 				efa= addface_from_edges();
 				if(efa==NULL) {
-					/* the order of vertices can be anything, three cases to check */
+					/* the order of vertices can be anything, 6 cases to check */
 					if( convex(neweve[0]->co, neweve[1]->co, neweve[2]->co, neweve[3]->co) ) {
 						efa= addfacelist(neweve[0], neweve[1], neweve[2], neweve[3], NULL, NULL);
 					}
@@ -643,6 +643,16 @@ void addedgeface_mesh(void)
 					else if( convex(neweve[0]->co, neweve[2]->co, neweve[1]->co, neweve[3]->co) ) {
 						efa= addfacelist(neweve[0], neweve[2], neweve[1], neweve[3], NULL, NULL);
 					}
+					
+					else if( convex(neweve[1]->co, neweve[2]->co, neweve[3]->co, neweve[0]->co) ) {
+						efa= addfacelist(neweve[1], neweve[2], neweve[3], neweve[0], NULL, NULL);
+					}
+					else if( convex(neweve[1]->co, neweve[3]->co, neweve[0]->co, neweve[2]->co) ) {
+						efa= addfacelist(neweve[1], neweve[3], neweve[0], neweve[2], NULL, NULL);
+					}
+					else if( convex(neweve[1]->co, neweve[3]->co, neweve[2]->co, neweve[0]->co) ) {
+						efa= addfacelist(neweve[1], neweve[3], neweve[2], neweve[0], NULL, NULL);
+					}
 					else error("The selected vertices form a concave quad");
 				}
 			}