[Corporat]

no, its not that. basically, once the particles reach a certain height, they dissapear for a short while, then come back.

and i know that it is more like steam than smoke coming out of the wide smokestacks (or whatever you call them), but I'm looking to make the scene look overall dark and unclean. i've worked on it a lot after i posted the picture here, and it's really coming along. again, thanks for all of your help