Specular material behavior

[Sorel]

So I was working on making a hair shader and decided to experiment with the specular material. However I noticed that it creates some very bright highlights that remain even when I turn the reflectivity to 0. Is this intended? Is there a way around it? The hair is flat planes that use alpha maps by the way, not strand/fiber based.

[galleon27]

Hi Sorel,

There are various ways to tackle hair-shading in Octane and depending on that, a rougher result can be achieved.

Here is a previous test I did on an older version of Octane (scene originally created from martimoo's groom for an Octane-dev feedback):

hair_demo_elsksa.gif

The important part is the two available modes: Albedo and Melanin + Pheomelanin. I am using the latter (as the case in my gif) and rarely the former.

Albedo, Melanin + Pheomelanin(Hair Shader) works only on Stand-based Hair and not Hair cards.

[galleon27]

I would avoid using Specular Material for Hair since the "very bright highlights" are most likely refractions. Can't really know for sure since i also don't use Hair Cards. Specular Materials are used for glass, liquids, etc.
Use Universal Material instead.

[Sorel]

I would avoid using Specular Material for Hair since the "very bright highlights" are most likely refractions. Can't really know for sure since i also don't use Hair Cards. Specular Materials are used for glass, liquids, etc.
Use Universal Material instead.

I started doing this and using the thin wall (diffuse) option and the results are satisfactory.