   fog question
  hi everybodyI'm using C# (VS 2008) & managed DX, my current project (which is almost done but needs only a bit of fine tuning) is something like NASA worldwind (an earth model which can display geographic data...), I'm going to implement some environmental effects on my earth model, something like FOG and CLOUD, what are your suggestions? dx fog is not good enough for simulating a real scene, how can I use volumetric fog? any sample? any tips? how can I make my scene look more realistic?thanks in advance   
  HiTake a look at this paper. It was very useful to me.   