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Alpha of scene objects in reflections?


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Dear Forumers,

I am trying to render a reflection of my scene in a pane of glass to comp in Nuke. What I need is an alpha channel that is composed of the objects in the reflection NOT the pane of glass itself. How can I achieve this?

I'm guessing also that a cryptomatte which contained the objects IN the reflection would also be just as helpful but I don't know how to get that either?

Thanks in advance,

Nick

PS: I am using Karma

PPS: Ideally I would like to do this in the OUT context, NOT Solaris

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