Vray Use Background equivalent?

[Steve Davy]

Anyone know how to get the equivalent of a Use Background shader out of Vray?

I'm looking for the same behavior where in a single pass I can get holdout in all four channels.

I suspect it's done with the Material Wrapper, but I don't seem to be able to get the holdout working in the alpha as well as the RGB no matter which settings I use in the Matte Properties. I can either get alpha or no alpha on my holdout objects, but can't find a way to get black hole from them which is what I need for comping.

[Steve Davy]

Doh, never mind. Setting Alpha Contribution to -1 was what I needed.

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From: stevi...@hotmail.com
To: maya...@googlegroups.com
Subject: [maya_he3d] Vray Use Background equivalent?
Date: Fri, 13 Feb 2015 23:47:35 -0800

Anyone know how to get the equivalent of a Use Background shader out of Vray?

I'm looking for the same behavior where in a single pass I can get holdout in all four channels.

I suspect it's done with the Material Wrapper, but I don't seem to be able to get the holdout working in the alpha as well as the RGB no matter which settings I use in the Matte Properties. I can either get alpha or no alpha on my holdout objects, but can't find a way to get black hole from them which is what I need for comping.

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