Hi Filip,
Thanks for your reply. I allready thought it would be complicated. What I try to accomplish is something like this:
http://www.istockphoto.com/stock-video-3446726-cells-under-a-microscope-sea...
I need a microscopic view of cells. But if I set up a particle system with Trapcode Particular, they just go over each other. And it doesnt seem to have a function witch let bounce of individual particles.
Excuse me for my bad english.
Greetings Marten