Physically Based Rendering and Physical Based Shading in Unity.
Sources
Amplify Shader Editor - https://tinyurl.com/y4u78yuy
ASE Wiki - http://wiki.amplify.pt/index.php?titl...
Allegorithmic PBR Guide 1- https://substance3d.adobe.com/tutoria...
Allegorithmic PBR Guide 2- https://substance3d.adobe.com/tutoria...
Community PBR Guide - https://goo.gl/wmxXZB