I'm just about ready to go over to their forum and post. I just don't want to look like an ass on my first post.

I think there is a bug.

I applied a shader that is just ambient red, or air, based on the layered material transmap approach.

I imported the original hair OBJ. I did not export first from Poser. This is the actual obj file from Kozaburo in the geometries folder.

When you import this obj, the individual pieces come in separately, so you can move them around.

I have taken apart the left side of the hair (we're looking forward from behind.)

As you can see, the individual pieces each render perfectly against the sky.

But the assembled pieces on the right half are producing artifacts.

Before I took it all apart, there were the same artifacts on both sides. I found that I was able to change the artifacts just by moving pieces around slightly.

I was also able to get the artifacts even when I made some of the overlapping pieces 100% air material, instead of the layered mixture.

I was also able to create MORE artifacts by surrounding the whole hair with an air sphere. What I mean is I made a sphere, and attached the air material (100% refraction, IOR=1).

I still don't know precisely how to make it happen. I'm trying to find some combination of overlapping polygons.

This sort of thing usually is the result of not setting enough ray-trace bounces to pass through all the polygons. You eventually run out and get just blackness. But I increased the bounces to 25 and still got the artifacts.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)