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easier way to render track mattes
I have a many layered composition and I want to render greyscale track mattes for layers that takes into account any foreground obstructions.
I am having to select the layer, apply a white fill to it, precomp all the layers in the front, and apply a black fill to that. This is very slow and I have to do this to a number of layers which means constantly applying and removing effects and all the headaches that precomping introduces.
Is there a simpler way of doing this that I am missing? A script or render setting that I have overlooked?