I'm thinking about my next project and the idea requires realistic clouds to be rendered in real time as accurately as possible.. with sun sets, sun rises, fog... etc..

like this.

http://www.ofb.net/~eggplant/clouds/

anyone got any clues? pointers? tutorials? Libs?

I want to write a game, not reinvent the wheel.. so if there's an existing tech, if I can, I'll use it.