Correct.

And the P node, that returns position, does so in units of tenth of an inch, i.e. the value 10 = 1 inch. More than one person has claimed it is 1/1000 of PNU but that's just plain wrong. I can prove to the 10th decimal place that the P node speaks in Poser inches. This is why I so often talk about the 103.200005 business. That last digit matters if you're making precise displacements or P-node calculations. If you're off by a millionth of an inch, it is visible in some cases. Not because of position, per se, but because of slope anomalies that can be the result.

Anyway...

I don't remember the details but I recall reading that the entire material system was developed by another company, and either the system or the company was purchased by Curious Labs. Then the sytem was plugged into Poser, pretty much as is. As it was a completely separate drop-in module, I assume there was no reason to go through the code and change it to PNU. It was left as-is.

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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)