go to mark harris’s site, and its there. http://www.cs.unc.edu/~harrism/
currectly im implementing hybrid of several techniques. i use haris’s phase transition functions, and from another paper i take the buoyancy forces. this gives me good results, but its not finished yet.
I implemented this one:
http://nis-lab.is.s.u-tokyo.ac.jp/~nis/abs_sig.html
Don’t be afraid, it’s not that theoric, and the algorithms are easy to implement.
Y.
what exactly from this page did you implement? but I’m close to success with my approach, looks already “cloudy” 
.
Jan
In fact it looks great now 
But I can’t post any pics because I do not have a web page to post them… maybe I should get one. Anyone curious to see my clouds ?
Sure, just get some free webspace from geocities or the like.
-Ilkka
OK here are some pics:
http://de.geocities.com/westphj2003/clouds.html
I would really like to know if you think this is “good” or just beginner’s stuff… as the code is rather a hack at the moment, but at least I am quite surprised that it looks that good (as I think).
Thanks
Jan
it looks really good.
im having trouble implementing the physics method.
I used a very simple algorithm for generating the clouds, there is a regular grid (for example 40x20x40) which I fill with random vaules from a 3D Perlin Noise function. These values are then modulated with a distance attenuation function to make it “round”. An finally, if the value in a grid cell is above a certain threshold value, a particle is placed in this cell.
Yes, they look really nice.
I wouldn’t call this beginners stuff, altough I guess it’s not exactly never-been-done-before either. But you can definetly feel proud of them
-Ilkka
thanks :-).