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Can anyone please, please, please tell me how to ensure that no particles fall through the collide object when simulating? It never seems to work fully. Some collide while other pass through. What is the magic setting to make sure they do what they're supposed to?

In your ICETree, you can increase the simulation steps.

There was also an update with a "continuous collision engine" at some point:

http://webrel2.softimage.com/open/video ... Engine.flv

might be the one from this compound:
http://download.autodesk.com/global/doc ... urface.htm

found here:
https://forums.autodesk.com/t5/softimag ... -p/4090420