Well, I have to admit that I'm more interested in Metaform function in Vue-I for flowing liquids with collision response to the environment. Particle Illusion is probably the best way to go otherwise, as it is post processing. BTW, thanks for jogging my memory, Phoul! I hadn't checked Ebay in awhile, and just now snagged an unregistered copy of After Effects 5.5. Now to start saving pennies for PI. I still want Metaform, though; Vue has =needed= actual dynamic waterfalls for such a long time now...