Am 02.07.2015 um 10:25 schrieb scott:
>> - Always use "fresnel on" for reflections (don't forget to specify
>> "ior"), or "metallic on" where applicable, and always use 0.0 for the
>> minimum reflection (or leave it out, specifying the maximum reflection
>> only).
>
> If you are using fresnel, is it valid (from a PBR point of view) to even
> scale the results using a maximum reflection other than 1?

Absolutely - if, for instance, your surface is littered with 
non-specular material at a microscopic level. Fine rust on iron steel, 
for instance, or a thin coating of dust.

In those cases it might be better, however, to use an average of two 
materials.

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