[Unity] Tesselated Ocean Shader Normal Reconstruction

[Deleted User]

Hi !

I'm trying to make an ocean shader based on this GPU Gems article (https://developer.nvidia.com/gpugems/GPUGems/gpugems_ch01.html ) and this YouTube tutorial(https://www.youtube.com/watch?v=_y7Z0MbGOMw), with Unity's Amplify Shader editor. Here's my graph :

And the Gerstner Wave Shader Function is a bit messy :

But it's basically this function :

Here's my question : In the video and in the paper, they uses this function to recalculate the vertex normals :

But I can't figure out how to reproduce the Unreal Graph for this function inside of Amplify Shader Editor, it gives me really strange artifacts.

I assume that it's because both the paper and Unreal uses different x y z coordinates systems, but I can't figure out what to change :c

How should I go about recalculate these normals ? I hope someone here can help me, I've been struggling with this a lot !

PS: I'm french, please excuse my english ^^

[Deleted User]

Nevermind, I just found the solution ! In case anyone have the same problem, just pipe your displacement into this :

fikoljuky

Hey did you plug in the output of Local vertex offset into DDX and DDY? Also, where do you plug in the output of the nodes in the last picture?