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1. // Orthnormalize Tangent Space basis per-pixel
2. // Necessary to support high-quality normal-maps. Compatible with Maya and Marmoset.
3. // However xNormal expects oldschool non-orthnormalized basis - essentially preventing good looking normal-maps :(
4. // Due to the fact that xNormal is probably _the most used tool to bake out normal-maps today_ we have to stick to old ways for now.
5. //
6. // Disabled by default, until xNormal has an option to bake proper normal-maps.

7. #define UNITY_TANGENT_ORTHONORMALIZE 0

https://forum.unity3d.com/threads/fresnel-on-standard-shader-too-strong.314252/