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?
Solved! Go to Solution.
Solved by Stephen.Blair. Go to Solution.
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.
Can't find what you're looking for? Ask the community or share your knowledge.