Thanks @all8up . The interior AABB sounds like an AABB that would completely fit/ be encapsulated inside the exterior AABB. Which is what I did manually now with the ‘primary AABB’, which obviously causes other issues with culling, collision etc. All clear that there needs to be a separate (interio…

JoeJ said:
Yes. But my understanding is only very basic. The idea is similar to how we use occlusion queries. I think it would work somehow like this: You have clusters of geometry (like your ‘regions’). Each cluster has a bounding box, which you convert to bounding rectangles in screen space, which…