Quote - 700 nodes? rendertime is very long  right?

you did this with matmatic right?

Yes, of course. Even if a human could keep track of all that, the material room becomes so slow with so many nodes that each change would make you wait several seconds.

I generate the nodes with matmatic. There are so many because Poser shaders do not have looping procedures with variables. So, matmatic does the looping, and for each iteration it generates a set of nodes. In this render, there were 30 iterations for each of the two layers, so 60 sampling layers. Each sampling layer requires 12 nodes - that's 720. The other 24 nodes are for some control parameters, color choosing, and a few basic coordinate transformations that feed into every iteration. So the shader really is only 36 nodes, but part of it is repeated so many times to get the volumetric sampling.

Render time is longer than a simple photo, but not nearly as long as ray-traced shadows on transmapped hair. These images rendered in about two minutes.

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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)