In some tutorial ones that I saw, the FOG is dealt with as being a global aspect the map (as ambientlight), but is possible to only apply FOG in a region of the map?
u know, now that i think about it there might be a way. if u were to make a map as one big square u could give it fog. then make a box inside it textured as sky, but seel it off. hmm, i need ot test this.