So there is a way to recover the original mathematical value of the displacement.

I moved the color out of the Clouds node, and into a Color_Math node, using the Pow function. Poser is "Input Gamma" correcting my color by raising it to the power 2.2 - I then raise it to the power 1/2.2, thus cancelling out what Poser did to my color.

This is tedious - I do a lot of very precise color math in some of my shaders, and I'll have to go through them all and add the anti-gamma setup I show here all over the place.

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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)