i hav played HL2, and i cannot remember a bit where it has camera movement with the skybox. the main example i can think of is in the early levels when u can see the citadel. it is a 3D, animated skybox, but the camera does not move with it (at least not in those levels, i can't be bothered playing through and looking for it). maybe it has a sky layer that does move, but that is unrelated.

i see very little point with having the skybox simulate camera movement because it is just a waste of code and processing power: why not have full size scenery with lower-res textures and no collision detection? the size of the model doesn't matter much at all (to my knowledge), as it is still the same amount of points and texels seen on-screen. to me it sounds like extra work for nothing, so please give examples of improved framerate and explanations of why it actually helps. i guess if u can save level size vastly by having a miniature skybox it could be helpful, but if the background is on that sort of scale i dont see why u wouldn't use an ordinary skybox.

please give explanations and examples of how and why it actually improves framerate! thanks

julz