Fixing normals after doing animated displacement?

Kaine123

Hi polycount! 

So I made a material with basic gerstner waves and it's all plugged into the world displacement output of the material. As you can see, despite the wireframe showing that the material is animating correctly, the normals are messed up and look unchanged from when it's a flat plane? 



I would greatly appreciate if someone could point me in the right direction towards fixing this issue with my material? 

Obscura

That is the expected behavior. The normal calculation would depend on the material setup, but you can usually calculate them using 3 offset samples. 

Obscura

So if your procedural is s then it would be like snormal=(s+sx) +(s+sy) +(s+sz) 

Obscura

Check out any normal generating material function.

Kaine123

So i got normal sampling working with the gerstner waves function. also here's the full code saved into a text file if anyone wants! In order to use the gerstner wave code just copy and paste the contents of the text file into your unreal material editor and use it as a function or any other graph