Here is my problem: I have a scene with a large number of objects (specifically billboarded stars at varying distances). Since they are in the background and stationary, it seems to me that I would save a lot of processing per frame if I could render them once, then dump them into a cube map which I could then use to build a simple skybox. I mean, rendering 6 textured quads every frame has to be better than thousands, right? Is there a way to do that using OpenGL?