Have a peek at my entry for this months Vue challenge (link to the thread in the announcements box above) I used a boolean differance to hollow out a cube, then put in two planes, one for the floor, one for the ceiling. As bloodsong said, I used another cube to cut a hole in the wall for the window. The reason I used a solid cube for the room is because it gave me greater control over how much light was actually in the room. Rich