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Holdouts are an integrator feature implemented at the integrator level. Available integrator that support holdouts are: PxrPathTracer, PxrVCM, and PxrUPBP. Because holdouts are considered an intrinsic geometric property when calculating illumination, LPE workflow remain unchanged for holdout geometry.

Lights

By default, light sources do not illuminate holdout objects directly. This prevents double contribution between 3d lights used to illuminate non-holdout geometry and the illumination already captured on the plate image.

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