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PxrMatteID outputs matte AOVs for compositing. This requires you add a User Attribute, explained in more detail here.
Add a user attribute for MatteID0.
Set its type and color value.
Add PxrMatteID
In your PxrMaterialBuilder 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
