I assume he's referring to a prop with a floor. If so, you can double-click the floor (or go to properties) and switch off it's visibility. Alternately, you can set it's material to 100% transparency in Surface Materials. I had this problem with the room pack I'm making, and partially solved it by making the walls 2-sided, so you can set the outer material of the walls, floor and ceiling to 100% transparency. That way, you can see into the room from any angle at all. mac