Thanks XMAMan.
My BSDF system is based on PBRT and Mitsuba BSDF and material system. They are both simple yet powerful, although I find the Mitsuba's system to be more versatile. Most of the interesting materials are based on the mixed/blend material system of PBRT and Mitsuba (e.x. rusted metal). I haven't implemented the Disney BSDF system yet (it's at the bottom of my to do list). All the PBR materials are from the Substance Source (
https://www.allegorithmic.com/products/substance-source).
I will be adding captions to the screen shots some time soon. At the moment, all my time is spent on transitioning from the FBX SDK to the Maya API.