Cryptomatte
Example:
https://help.maxon.net/r3d/maya/en-us/Content/html/Cryptomatte.html?TocPath=AOV%20Topics%7C_____5Cryptomatte is a tool used in compositing to create automatic ID mattes from 3D scenes. It generates precise masks for different objects, materials, or layers, making it easier to isolate and manipulate specific elements in post-production without the need for manual masking.
Credit:
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