Quote - Either curious labs or e-frontier (I dont remember which) had Poser native units as having changed slightly when Poser 6 was introduced. The difference was minor

ONE POSER NATIVE UNIT IS THE EQUIVALENT OF 8.6 FEET, OR 262.128 CENTIMETERS from the Poser 7 manual , thats 103.2"  

I use a conversion factor that a friend had developed and while not accurate it is close enough for modelling in real world units .

Close enough for some things, not others.

Load a prop. Set your Poser Display Units to PNU. Set yTran to 100,000. Change your PDU to Poser Inches. Look at the yTran dial. It has changed to 10320000. That's support for the idea that the ratio is 103.2. However, the dial is truncating digits.

Click on it. The text edit box that comes up now shows 10320000.458. That's why I said to use 103.200005. That's close enough for displacements to be accurate. The 103.2 is close enough for most modeling, but not for displacements.

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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)