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Cryptomatte selections

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Hi Guys & Girls


I was playing around with the new cryptomatte implementation in Arnold, works pretty good, but it's hard to find extra information on the internet about it.

Something that I was asking myself is what exactly does the crypto_asset pass do? I've read it renders the same matte for all objects, so what's the difference with a normal alpha channel?


I do understand that crypto_material does mattes for each material and crypto_object does mattes based on objects like an ID pass.


So, my main question is, can i somehow create cryptomatte "selections" with different object groups?



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