Custom glosiness

[Rimasson]

Is there a way to control the glosiness curve, like in Zbrush, to get a flat look ?

[Piotr_Adamowicz]

In Cycles, no, this would require a new BRDF.
In Eevee, you can convert a brdf node to color and run a color correction curve on it.

You can also just use any matcap you like, but that’s viewport-only.

[moony]

I experimented with something like that in this thread - although it might not be exactly what you are looking for.

Subtract shaders - no longer works, but new sheen node can get pretty close

Another interesting effect that I hadn’t considered - and could actually be used to replicate in cycles - the type of specular highlights you get in BI (which I know people have been asking for on other threads). Rather than have the roughness of the negative RGB node smaller than the positive RGB node (which gives a halo type effect) - invert the roughness values - and you force the highlight to fall off quicker than it otherwise would. Examples: This is a single glossy shader with roughness…

[Secrop]

Have you tried the ToonBSDF?

Just change the component to ‘glossy’ and play with the ‘size’ and ‘smooth’ values.