JC Well as you can see not boolean wise. I just did it in B5 just now, with a glass I made from terrains some time back.There might be something colorwise I'll have to look at when I've got time. Ok start over. Import your glass do not ungroup it. make the whole group popsitive the reock negative it should work. at certain angles you might not see the break. If nothing else works, try moving the camera slightly. - TJ