ChromeStar posted at 7:47AM Sun, 03 January 2021 - #4409262

I think this is apparent if you study the comments above in detail, but I noticed in the documentation for the PrincipledBSDF in Blender it states clearly:

When converting from the older Glossy BSDF node, use the square root of the original value.

That seems to apply here too. So, to convert a P11 or earlier setting to P12, just take the square root of the original roughness. To convert a P12 setting for P11 or earlier, square the value (i.e. X^2, or X*X).

Sorry but square root... isn't that more something like x^0.5? I mean if x=sqrt(y), then x*x=y, no?

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