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This seems to get me every time I encounter this situation.
I have one object A passing partially inside another object B.
I want to render in layers so that in one layer I have a full, unoccluded pass of object B.
In the other layer I want to render object A, with primary rays for object B turned off using a VOP set.
I also want object B to knock out the parts of object A in either RGB, alpha or both so I don't have pixels that should be occluded because they are inside object B.
It seems like this should be possible using object B's object properties by setting it to a Matte Surface and setting its alpha contribution to -1. This is all the documentation I can find.
However, this simply does not seem to work and I continue to get pixels in the occluded parts of object A in both RGB and alpha.
What am I doing wrong? This should be simple. Thanks.
I have one object A passing partially inside another object B.
I want to render in layers so that in one layer I have a full, unoccluded pass of object B.
In the other layer I want to render object A, with primary rays for object B turned off using a VOP set.
I also want object B to knock out the parts of object A in either RGB, alpha or both so I don't have pixels that should be occluded because they are inside object B.
It seems like this should be possible using object B's object properties by setting it to a Matte Surface and setting its alpha contribution to -1. This is all the documentation I can find.
However, this simply does not seem to work and I continue to get pixels in the occluded parts of object A in both RGB and alpha.
What am I doing wrong? This should be simple. Thanks.
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