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PxrUnified is initially included in RenderMan as an experimental integrator. Eventually this integrator will become full-featured and ready for reliable production rendering. Note that PxrUnified does not currently support the holdout workflow in this version.
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PxrUnified is the integrator Pixar relies on for its own film and animated shorts. It implements both the forward path tracing algorithm and bidirectional choices along with selective "cheap" caustics using the Manifold Next Event Estimation technique here called Manifold Walk. We also include the options for Indirect Guiding that improves indirect lighting by sampling from the better lit or more important areas of the scene.
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