[quote="deadeye":22ze8738]But the third one works... and WTF?!? How did you do that?
it's part of the 's' plugin
all of the important code is pasted from the CD-ROM(the download version) that accompanied Jos Stam's Realtime Fluid Dynamics for Games talk at the 2003 Siggraph
the one in the version that works for you is a distorted sprite
and the color filters are adjusted according to the smoke density
that math is lightyears above my head
but you can find a pdf of the talk easily by googling