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Hey Arnold team! From the docs available it appears that Cryptomatte only works at the asset, material and object level - but is there a way to get it to assign a matte ID to seperate UV shells? This could be enormously handy for those tricky shots.
No, as far as I can see, cryptomatte is object based.
Also, the Arnold team did not write cryptomatte, nor do we maintain the code. We do bundle the compiled cryptomatte with Arnold though.