Faces split: Don't leave CD_NORMAL after split

This is supposed to be a temporary layer.

If someone needs loop normals after split it should explicitly
ask for that.

2 files changed, 4 insertions, 4 deletions

diff --git a/intern/cycles/blender/blender_util.h b/intern/cycles/blender/blender_util.h
index 8120de96362..4411181dbcc 100644
--- a/intern/cycles/blender/blender_util.h
+++ b/intern/cycles/blender/blender_util.h
@@ -80,6 +80,7 @@ static inline BL::Mesh object_to_mesh(BL::BlendData& data,
 			}
 			else {
 				me.split_faces();
+				me.calc_normals_split();
 			}
 		}
 		if(subdivision_type == Mesh::SUBDIVISION_NONE) {
diff --git a/source/blender/blenkernel/intern/mesh.c b/source/blender/blenkernel/intern/mesh.c
index 33e29dc0ff3..24a01b17e53 100644
--- a/source/blender/blenkernel/intern/mesh.c
+++ b/source/blender/blenkernel/intern/mesh.c
@@ -2376,11 +2376,10 @@ void BKE_mesh_split_faces(Mesh *mesh)
 	/* Perform actual split of vertices and adjacent edges. */
 	split_faces_split_verts(mesh, num_new_verts, vert_flags);
 	split_faces_split_edges(mesh, num_new_edges, edge_flags);
-	/* Adding new vertices will change loop normals.
-	 * Since we ensured there is CD_NORMAL layer for loops we must bring it
-	 * it back to a consistent state.
+	/* CD_NORMAL is expected to be temporary only, and it's invalid at
+	 * this point anyway.
 	 */
-	BKE_mesh_calc_normals_split(mesh);
+	CustomData_free_layers(&mesh->ldata, CD_NORMAL, mesh->totloop);
 	MEM_freeN(vert_flags);
 	MEM_freeN(edge_flags);
 #ifdef VALIDATE_MESH