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Have you tried Cryptomatte instead of MatteIDs for automatic ID generation? |
Assigning Matte IDs to rendered object and outputting them as part of the AOVs can be useful for later compositing because this allows compositors to isolate objects.
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First we'll assign a Green MatteID to the sphere. We can do this by selecting the material transform and adding the RenderMan user attribute for MatteID0:
The result of this is the added parameter under the Extra Attributes of the PxrSurface material. We've made it Green:
If you were to render at this point, even if you added the correct render pass, it would not work. You need to connect a PxrMatteID to the material. You can do this using the Node Editor and connecting to the Utility Pattern Connection of the PxrSurface material:
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Now add the appropriate pass to the render outputs:
The resulting MattID0 pass looks like the one below:
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