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PxrMatteID outputs matte AOVs for compositing.  

Add a user attribute for MatteID0.

Set its type and color value.


Add PxrMatteID

In your RIS Network, add a PxrMatteID VOP.  Set the color as the user attribute above.


Connect PxrMatteID's resultAOV to PxrSurface's Utility Pattern.

Set up AOV for Output