PBR Texture Conversion

Here is a nice article on PBR workflow and in particular the conversion of non PBR assets, from Marmoset:

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.