Volumetric fog attempt (Half-Life)
... a very inefficient one at that. In essence, 3000 quads are being drawn for the fog. 1000 flat, horizontal quads, 1000 vertical ones and another 1000 vertical ones rotated by 90°. What is visually achieved is 3000x3000x3000 little cubes which blend to create fog.
Eventually, I'll do a more proper volumetric fog, probably with a 3D texture or something.