I'm trying to build a map that takes place on top of buildings in a city. I want the buildings to extend extremely far down, to create a feeling of height. Should I extend the 2D skybox down, or use exclusively 3D skyboxes? Some of the buildings are seen from multiple angles, so I want them to be at least partially solid, and I'm not sure if I should combine solid objects and 3d skyboxes. That seems like a bad idea.