What's the origin or meaning of the word "Principled" in "Principled BSDF"?
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2 Answers
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The Principled in Principled BSDF comes from the Brent Burley, to reflect the goal of a consistent, physically based shading model built on clear, well-defined principles, rather than a collection of ad-hoc parameters or legacy shading tricks. In short, it means a shader designed around physical principles of light and material behavior, while still being easy and intuitive for artists to use.
This model was published in Disney's 2012 paper PBR conventions used across modern rendering engines (Unreal, Renderman, Substance, etc.). In summary, it's called Principled because it's based on physically-grounded, artist-friendly principles, not because of a specific technical feature.
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OK, so principled is OpenPBR standard. It's supposed to match principles of PBR workflows.
