Illusion is 2d partical generation program that thinks it's 3d. if you have open GL which i am sure u have, it renders fantastic special effects over avi files in real time. Pyrotechnics, water, smoke, dustsmoke effects, etc. And they look stunning. Its price is fantastic too. Go to www.coolfun.com to download the demo and sample mpegs. Oh, by the way, i do not work for them either!! i am just a very happy customer.