It's actually harder than it seems to cut off the ceiling, houses may have all sorts of weird heights, angles and corners, doors, arches... Any simple solution

It's actually harder than it seems to cut off the ceiling, houses may have all sorts of weird heights, angles and corners, doors, arches... Any simple solution might work for 80-90% of models, but our viewer has to work for 100%. So we only remove faces with backface culling currently, we're going to do better soon though :)