bugfix [#23191] Ctrl-LMB quick extrude problem with non-perpendicular edges/faces.

also remove is_mat4_flipped() from transform_manipulator.c.

1 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/editors/mesh/editmesh_add.c b/source/blender/editors/mesh/editmesh_add.c
index 7dac8a465fa..90c5314bf3d 100644
--- a/source/blender/editors/mesh/editmesh_add.c
+++ b/source/blender/editors/mesh/editmesh_add.c
@@ -141,7 +141,16 @@ static int dupli_extrude_cursor(bContext *C, wmOperator *op, wmEvent *event)
 				done= 1;
 			}
 		}
-		if(done) normalize_v3(nor);
+		if(done) {
+			float view_vec[3], cross[3];
+
+			/* correct the normal to be aligned on the view plane */
+			copy_v3_v3(view_vec, vc.rv3d->viewinv[2]);
+			mul_mat3_m4_v3(vc.obedit->imat, view_vec);
+			cross_v3_v3v3(cross, nor, view_vec);
+			cross_v3_v3v3(nor, view_vec, cross);
+			normalize_v3(nor);
+		}
 		
 		/* center */
 		add_v3_v3v3(cent, min, max);