I am talking about : ://www.3drender/glossary/anisotropic.htm
In some content example map, they talk about it and how the engine can’t get real anisotropic shading in metals, let alone in hair and that they are using some AA technique to mimic it and they talked about it in a twitch live stream too (talking about SSSSS and Fortnite, maybe the stream about 4.5 if I remember correctly). You can check that.
I always checked work and it was great (I wonder what hapepned to him since we didn’t see him for a long long time and I hope he is fine and comes back). There is no way he has anisotropic shading in his model and it is not visible in his work. In fact, he asked to get the code to integrate Nvidia hair works in his model but they refused so He turned toward ATI and got TressFX from them and his work is based on it. Both Nvidia Hair works and TressFx don’t have anisotropic shading. In fact if Epic succeeds in putting it correctly for metals, is already a very big thing.
Edit: is a quick confirmation I just found now: https://forums.unrealengine/showthread.php?49051-Anisotropy-material
You can find more and more by yourself !
Edit: Found it, starts around 52:30: ://youtu.be/DQt_OopZadI?t=52m30s
Also found it at content examples under Material_Experimental Level: