I’m not entirely sure, but this is more of a gut check than 100% certainty. looking from the outside i can see the individual room geometry (due to backface culling), but flying through the rooms I don’t xray and see other room geomerty, and the framerate improved due to occlusion culling reducing the geometry that we need to draw.
Since everything is flat, its hard to tell if the geometry is 100% correct, but there’s no obvious tells here for me.