I want windows (not microsoft's... y'all know what I mean..) on my map, and I thought it was really that simple of cutting the window piece of the texture out, and then make a func_breakable out of it, with 0 health. But it is still the same...
EDIT: If you wonder why I want glass, this is the reason: When you shoot the glass (wall) the holes doesn't look like glass cracks..