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Code Block
Light "PxrSphereLight" "spherelight" "string lightGroup" ["light__illumholdout"]

// render showing illumholdout light source

Shadows and Compositing

A holdout shadow pass can be output using the PxrShadowFilter plug-in. Occluded and unoccluded input AOVs should be rendered using the holdouts LPE prefix.

Code Block
DisplayChannel "color occluded" "string source" ["color lpe:holdouts;C[DS]+[LO]"]
DisplayChannel "color unoccluded" "string source" ["color lpe:holdouts;unoccluded;C[DS]+[LO]"]

// render showing holdout shadow pass

Compositing can be previewed in RenderMan by using PxrImagePlaneFilter SampleFilter plug-in. This will composite the beauty render over the specified image plane, using the alpha channel and holdout shadow AOV to mask the plate.

// render comparing image plane to no image plane

Additional Considerations

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