A short explanation about custom vertex normals (tutorial)
http://polycount.com/discussion/154664/a-short-explanation-about-… mals-tutorial
http://blogs.unity3d.com/wp-content/uploads/2014/11/UnityMetallicChart.png
http://blogs.unity3d.com/wp-content/uploads/2014/11/UnitySpecularChart.png
Тема в архиве.