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Not so quick tips with some basic theory and simple xpresso using P Pass AB node.
Example: vimeo.com/49072275
Scene: dl.dropbox.com/u/15988061/stuff/ppassab.c4d

Btw, you could use PRepulse&Bounce node. It works fine, but it has less controls that mine setup.

Also check out other tutorials on my web site philipppavlov.com/tutorials

j vimeo.com/49498973

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