Forum: Poser - OFFICIAL

Subject: What use for shader nodes dNdv,dNdu,dPdv,dPdu?

bagginsbill opened this issue on Mar 01, 2006 ยท 8 posts

bagginsbill posted Wed, 01 March 2006 at 11:12 AM

Attached Link: http://www.affine.org/showk.html

Out of curiosity I'm trying to find information about what possible use there is for these nodes. I've read the documentation. I am by no means "math challenged" and I understand what the documentation claims these nodes do. I believe the docs are lying, but I could be wrong. In any case, has anyone ever USED these nodes in a predictable way? I've searched high and low. The link points to some code used in the renderman toolkit, which I can read and understand just fine, BUT WHAT IS IT USED FOR???!?!?!?

In this render, I've used red * .1 * dNdv + green * .1 * dNdu to color a V3 face through the ambient channel. This looks like nonsense to me.

Did the developers of Poser just throw these in there because they were easy to implement or is there some useful known effects for these nodes?

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