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OpenPBR: Novel Features and Implementation Details

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Jamie Portsmouth, Peter Kutz, Stephen Hill

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Description

OpenPBR: Novel Features and Implementation Details is a technical companion paper by Jamie Portsmouth (Autodesk), Peter Kutz (Adobe), and Stephen Hill (Lucasfilm) for the OpenPBR physically based uber-shader used in VFX, animation, and design visualization.

It covers slab-based layering, statistical mixing, and microfacet foundations, then metallic, dielectric, subsurface, and glossy-diffuse bases, thin-film iridescence, coat and fuzz layers, and thin-walled mode. Deeper notes address specular versus transmission decoupling, subsurface parameterization, coat darkening, thin-film interference, and planned hazy specular and retroreflection work.

It is for advanced rendering engineers implementing layered PBR materials who already know BRDFs and BSDFs. Expect mathematical derivations rather than artist slider tutorials.

Access is a free arXiv abstract page with PDF download. Related OpenPBR specification and MaterialX graph materials are referenced from the notes.

The companion notes help match OpenPBR 1.1 appearance across renderers by spelling out intended light transport and parameterization pitfalls. Link last verified accessible on 2026-09-29. Link last verified accessible on 2026-09-28.