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VFX artists often need to composite the CG objects over a live action film plate. To convince the audience that the CG objects are real and belong to the scene, holdouts are used to collect the CG objects' shadow and reflection that match very closely to the shadow and reflection in the live action plate.

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Holdout objects are used in place of real world object to catch light interactions from 3D objects. In RenderMan, holdout objects are specified by enabling the trace holdout attribute.

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