Saw this technique on a job recently. Basically, using a UV pass to track and position footage into a 3D render. May be something that is more obvious to heavy Nuke users, but not something that I've seen before. A simple and practical use for a UV pass!
Part 1 is about how to get custom color passes out of Maya/Mental Ray (readdressing some info from 2008 custom pass tutorials) and Part 2 is about using the UV pass in Nuke to composite our footage into our UV mapped renders.

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