This video shows you how to create Custom channels for 3D compositing in Nuke.
Whether you want to do your own Custom-pass Compositing or use mattes for different objects you have rendered in Nuke, this tutorial has everything you need.
Find the Nuke Script I have used here http://goo.gl/Ey8yHt
(Browser might open the file, just save it as a *.nk and open in Nuke)
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