I don't know for sure, but this doesnt look normal to me.
roughness at 1
roughness at 0.8
file
What I don't understand is the dark gradient near corners, it only appears with medium-high roughness and it makes walls appear floating.
in cycles's principled shader the behavior is consistent without weird dark corners.
Is this normal?
dark gradients
Forum rules
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Re: dark gradients
It remenber me the grazing angle darkening issue. And i think we do need a new Shading model (Luxcore 3.0 maybe ) for that to be solved.
Re: dark gradients
I know this is an issue with older shaders (matte, glossy...) I thought disney doesn't show the problem (it doesn't in cycles at least)
I think bidir in luxcore also works well but haven't tested