Exporting a simple blinn sphere from Maya using ColladaMaya, I noticed the “Eccentricity” is exported as “Shininess” and the “Specular Roll Off” appears to be ignored entirely. I’m using Maya 2008, Extension 2 and FCOLLADA_VERSION 0x00030005.
Any ideas how to capture this Roll Off value without adding custom attributes?
Well, first of all, we decided to cheat and rely on the Specular Color to provide intensity, so we found a workaround. Secondly, Maya Help doesn’t seem to have an equation for the “Specular Roll Off”, so what it does formulaically is a bit of a mystery, although I suspect it has to do with the extra attenuation and fresnel terms used by Blinn-Torrance-Sparrow. Lastly, where and what is the bug? Material export in ColladaMaya? Specular tags in Collada? Invisible formula in Maya? Also, I don’t see a “Post Bug” option in this forum…