Implemented the ceiling and the holes. The ambience is getting somewhat closer to what was intended. The generator is now able to figure out the outer walls and put window holes into them. Ditto for ceilings. The grills are just plain quads running a shader that can display a parametrized grid.
I'll probably drop the AO for a completely flat look, but I guess that'd mostly depend on the gameplay. I had in mind something using shadows... Still contemplating...
