Quote - At the moment, the hairs have constant width and no UVs (or more to the point, no Vs, I guess), but I'll change that.

I need to preface my post here with the acknowledgement that I'm not totally clear on hair in Poser. Having said that...:

I think Poser hair has U, V, W, coordinates, and what you mention as V is actually W.

The U, V seem to be a constant for each hair and comes from the UV of the surface upon which the hair was grown. I use this fact to produce color patterns in the hair, particularly when used as fur.

The W value has traditionally not been accessible to Poser users in the mat room, except by the use of the "Hair" material room node. However, I recently posted a method of arranging nodes that permits us to directly use the W value for shading purposes. I don't think you need to see that, just be aware that it exists.

To match the shading behavior of Poser hair, it will be desirable to find all three coordinates and somehow provide that info in the exported hair. I believe that Lux supports not just UV but also ST coordinates. You may need to make use of that.

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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)