black hole/toilet bowl effect

[Mylenium]

A simple expression could do that.... You know, create a circular motion, animate its radius so it becomes a spiral, add some wiggle for randomization. 3D or 2D?

Mylenium

[suztv]

I agree - there are a few expressions that will accomplish what you want/need. Try these links and look for "follow"

http://www.creativemac.com/2003/12_dec/tutorials/followtheleader.htm
http://www.motionscript.com/mastering-expressions/follow-the-leader.html
http://www.aenhancers.com/
http://aescripts.blogspot.com/

With the follow expression you can always have the followers deviate a little bit by messing with the numbers or even have more than one leader.

Have fun!

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