Need help on a weird bug
I am currently using Unreal 5.6.1.
For beginners : SDF means Signed Distance Function : a function used to check the distance from a point to the closest point on a specific surface.
Hello there. I’m trying to create a simple water shader using Nanite tesselation displacement, and SDF functions to create ripples close to shores or any other partly submerged objects.
I sadly encounter a weird issue where my Distance Field Mesh replacement works for like 5 seconds and then the SDF breaks (AKA basic UE behaviour with a mesh tesselated and no SDF mesh replacement).
Does anyone know why ? I saw a post about it posted in AUG (2025) but it seems like it lacks details or screenshots or really anything to help beginners and normies to understand anything so I thouhgt I’d just create a new one.
Lastly, I’m using the same mesh with Nanite disabled for the SDF replacement mesh? Is it a problem ?
Any ideas ? ^^
Description of the video
I firstly try to recreate the working features by changing the Lumen Mesh Card Numbers which triggers the (re)generation of some mesh Data. It then works properly for 5 seconds (mesh is being displaced only where it is close to the cube) then everything break again.