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Holdout contributions can be composited over a film plate using an alpha and shadow pass as the masking termmasks. The shadow pass can be output is generated using the PxrShadowFilter plug-in and can be output to it's own AOV or added to the alpha. The occluded and unoccluded input AOVs should be rendered using the holdouts LPE prefix so that they only contain the shadowing term for holdout geometry.

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