The Cryptomatte Muxer node combines multiple Cryptomatte inputs into a single Cryptomatte output. This allows objects from different sources to be packaged together so downstream Cryptomatte tools can select and mask them as one set.

Key.

The Cryptomatte Muxer node can have multiple additional inputs. Right-click on the node and select Add Input. Right-click on an added input port to remove it. You can add as many inputs as you want, but the inputs will get smaller.