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The 3Delight Principled material is our interpretation of Disney's Principled BRDF (see References). Quoting from the main reference, a principled material adhere to these principles:

1. Intuitive rather than physical parameters should be used.
2. There should be as few parameters as possible.
3. Parameters should be zero to one over their plausible range.
4. Parameters should be allowed to be pushed beyond their plausible range where it makes sense.
5. All combinations of parameters should be as robust and plausible as possible. We thoroughly debated the addition of each parameter.

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