BREAKDOWN | Deep Compositing in Rise of the Planet of the Apes
Robin Hollander give this breakdown on using "Deep" data for Deep Compositing in the Foundry's Nuke. He does explain what it is and how it was used in Rise of the Planet of the Apes for compositing (Weta Digital). If you're not into Nuke, just watch anyway. Very interesting concept.
Render passes are very powerful, and with Deep it gets even easier on the compositor's side.