Non Camera Facing Clipping Plane?

[Lehm_2001]

I'm working on a 3d floor. Most of the time I shoot these from directly above and I can just use camera clipping to see inside. On this one its going to be at a slight angle. Is there some way to clip geometry detached from the camera?

[Macker]

Slice modifier?

[Lehm_2001]

That would actually remove the geometry from the scene. I want it to render as if the rooms have ceilings...the camera just sees through them.