Snarly has it. SM often tries something in a given release, finds it needs more work, and they just hide it, but the code is still there.

IDL was the same - it was actually present in Poser 7, but not officially present until Poser 8.

And in Poser 9, there is a new hair node which, being that it didn't work right, got pulled out, but the code is there. Perhaps we'll see it Poser 10 or 11. At which point, loading a P10 shader into P9 wil reveal that the node type is there. When that happens, I'm sure somebody will try it in P9 and start a confusing discussion of the existing hair node, versus the new one.

Similarly, we just learned that the Scatter node type is there in P8/PP2010. I didn't know that. It should not be confused with FastScatter - a different node, with the same word in its name.

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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)