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I would be a fan of vray having the ability to render a section of a frame based on a pre-made image mask (animated or still). Could turn around specific element re-renders much faster that way. Imagine a localized flaw in a very intensive moving camera shot. It took hours per frame to render the entirety. A comp artist quickly mocks up a moving roto mask. That is exported as a seq of frames, fed into vray as a render mask, and the flaw takes minutes per frame to render. Days=saved. Seems like a reasonably easy and useful tool to add.
Andrew
Andrew
