Eyebrow texture mapping

[alangreg47]

Hi

Can anyone tell me what the best material settings are for Eyebrows when rendering Poser figures. I can usually get good results with the transparency maps but I frequently get black borders around the edges of the eyebrow textures as if there is a seam problem. This only occurs when rendering in Octane so I obviously need to change the material settings somehow.
I am still something of a newbie when it comes to texture mapping. Any tips will be welcome.

[face_off]

Hi Alan

I generally use the eyebrow texture from the head map and make the separate eyebrows geometry invisible. But if you need to use the separate eyebrow geom, make sure rayepsilon if 0.00001 or less, and I think the index (or similar pin name) in the specular material needs to be 1 in order to remove the artifacts.

If you post a screenshot of what you are getting, that would help.

Paul

[alangreg47]

Hi

I have attached a screenshot of the artefact and of the default material settings imported from Poser. The FKJa-BrDefault.jpg file is simply an RGB map of the eyebrows area, the FKJa-Brows.jpg file is an alpha map (eyebrows in white, rest in black) used as a transparency map. I could, of course, simply merge the eyebrows with the face map in Photoshop, but I am intrigued to know why the artefact occurs.

[face_off]

Ah yes, I've seen that before. Octane will not handle a transparent material where the geometry (vertices) match exactly the position of other geometry. Where you see that black line is where that eyebrow prop meets the figurer's head. Either pull the brows out a fraction, turn rayepsilon to 0, or even scale up your scene in Poser by 10 or 100. A similar issue can happen when and eyelens cover exactly matches the geometry of the eyewhite.

Paul

[alangreg47]

Hi Paul


Thanks for this.
I have found the easiest way to solve the problem is to simply ignore the eyebrow materials altogether and use a modified face map with eyebrows added, this is a simple enough procedure in Photoshop.

Regards
Alan