URP fog on a mesh-terrain is different from Unity terrain

[zwcloud]

reported by user 地编-馒头Q25xxxx38

[zwcloud]

Cannot repo, waiting for more information from the reporter.

[zwcloud]

This is probably caused by that the mesh's vertex density is different with the current mesh LOD of the original Unity terrain. If you seeing similar issue, please try increate/decrease the mesh-terrain's vertex number.

Here is a video displaying comparsion of mesh-terrain fog and Unity terrain fog under same mesh LOD0 (same vertex density): https://user-images.githubusercontent.com/6965758/171832623-08247d1f-ad8e-44b0-b09f-658ae3baad8e.mp4

MTE's shader fog is defined by Amplify Shader Editor, which just use the built-in fog color provided by Unity. So in theory there should be no difference.