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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.

3Delight Principled shader has more than the 11 parameters listed in Disney's reference as it offers in order to offer more control on the coat and also has subsurface parameters.

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