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Matthew Goldblatt avatar image
Matthew Goldblatt asked ·

GPU rendering and matte object

I have read that you cannot use a matte (holdout) object if you are rendering GPU. Not interested in shadows, just want a matte object. Has this been dealt with? Shocking, all I want is an object to basically render a black alpha.

Does anybody have a workaround that doesn't involve a second render pass just to get an alpha for my scene?

gpumattes
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Stephen Blair avatar image
Stephen Blair answered ·

That's right, matte (the matte parameter on a shape, the matte shader, and the matte parameters on a standard_surface) are not supported yet on GPU.

How about a custom AOV where you output black for some objects, and white for all the rest? That's doable. But if you have partial transparency, that's more complicated.

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Matthew Goldblatt avatar image
Matthew Goldblatt answered ·

actually, I just tried that out last night and it worked like a charm. Perfect!!!

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