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Maxwell Render v3 Documentation > The BSDF > Custom Fresnel curve - r2 wrote:If you set the second parameter to 100, you are specifying that roughness should have maximum influence on the 0° and 90° colors; it would be as if you had disabled the .r2 functionality

...and:
[quote="Half Life in "MXM tip of the day""]Enable the R2 with a setting of 100 in the roughness parameter (R2 roughness) to maintain the colour and cut the surface haze of rough transmissive surfaces.
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My own tests also prove the effect that Jason showed to us back in 2011 but the documentation says it shouldn't work that way. Am I missing something?

Thank you.

Any R2 gurus here? Maybe, NL?

I'm not sure how you did your tests but the docs are right. Here is a simple example, with r2 roughness influence set at 0 and 100. With 0 the blue 90 color is fully visible as should be, with 100, I have basically disabled the r2 functionality:

Mihai, thanks for answering, now I see what was meant in the documentation.

It's just my perception that "disabled r2 functionality" should look like a disabled R2 checkbox, not like Reflectance 90 channel that is not affecting the result:

ababak wrote: It's just my perception that "disabled r2 functionality" should look like a disabled R2 checkbox, not like Reflectance 90 channel that is not affecting the result:

You lost me there, son.

Anyway, I see how it works, I see what was meant in the docs, thanks for taking your time.