Spherical Volumetric Fog
(Click here to enlarge)
I have been searching for help on Volumetric Fog recently, but haven't been able to find a good tutorial. So, I decided to improvise by making my own. Unfortunately its not perfect. I am currently working on several optimizations. It runs at about 5 fps on my computer, so it is very CPU intensive.
P300, 64MB, with a decent video card that supports OpenGL.