Is there a way to translate Ra(µm) (average Roughness) into Blender?

[CG GroundBirdie]

Like translating Ra 1.6 to the apropiate roughness value between 0 to 1? Because Roughness values are always displayed on technical drawings to specify how rough something should be. I think it could be usefull to make realistic materials, when using values like that instead of “quessing” based on the perspective of the creator/artist.

https://en.wikipedia.org/wiki/Surface_roughness#Amplitude_parameters

[spikeyxxx]

No, because Roughness in Blender is a visual trick to simulate surface roughness and (according to the mentioned article):

[…] surfaces which are obviously different to the human eye […] Ra fails to distinguish between two surfaces where one is composed of peaks on an otherwise smooth surface and the other is composed of troughs of the same amplitude.

So: different looking surfaces can have the same Ra value.

[CG GroundBirdie]

Guess, i didn’t read properly. Thanks for the reply anyway.

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