bagginsbill opened this issue on Apr 23, 2008 · 2832 posts
bagginsbill posted Thu, 18 December 2008 at 2:16 PM
Most apps use mid-gray for the neutral value. Negative displacements are darker and positive displacements are lighter.
In Poser, the neutral value is 0. Negative displacements are actually negative numbers.
Mathematically, I prefer 0 displacement to be represented by the number 0, so I like what Poser does. However, negative displacements cannot be encoded in an image, because they are only positive numbers. So they are shifted by .5, thus resulting in mid-gray.
So no problem. Use a math node to subtract .5 from the image. Plug that into your displacement channel.
In the PR3 version of my skin shader template, I actually do this for bump. Many bump maps are mid-gray for "no change here".
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)