I recently read a paper: Volumetric Clouds and Mega Particles[1]. Here's a demo of it in action: http://www.youtube.com/watch?v=3QqD26SXWDc http://www.youtube.

I recently read a paper: Volumetric Clouds and Mega Particles[1]. Here's a demo of it in action: http://www.youtube.com/watch?v=3QqD26SXWDc http://www.youtube.com/watch?v=3QqD26SXWDc It looks to be somewhat better than billboards and cheap as well, though it does have some drawbacks. [1] http://www.inframez.com/events_volclouds_slide18.htm http://www.inframez.com/events_volclouds_slide18.htm