Tutorial: PBR Texture Conversion
By Joe “EarthQuake” Wilson

In this tutorial, I’m going to demonstrate how content created for traditional shaders can be converted to PBR shaders, how to convert content from one PBR workflow to another, and explain the various differences in modern workflows. This tutorial is intended for intermediate to advanced users, so be sure to read the previous two PBR tutorials that Jeff Russell and I wrote as the base concepts are explained in great detail and may only be briefly mentioned here.

Basic Theory of Physically-Based Rendering - By Jeff Russell
Physically Based Rendering, And You Can Too - By Joe Wilson

Via: Marmoset