This post processing effect adds transitions in between seams of meshes,

This masively reduces hard seams when combining meshes together, which allows for rapid iteration of building terrains or environments without having to make custom assets for everything.

Works by mirroring and blending sides of seams,

Uses a render feature in URP, and a OnRenderImage script and second camera in BiRP

If you're interested in how the technique works I have an explanation on my website.

There is also a Pro version of this asset which improves upon the visuals and performance, and has some extra features. Here

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Mesh Seam Blending