Terrain Blending:

Currently the blending in the system will only work with unity terrain system. You could build on a mesh but there wouldn't be any blending done by the system to match the mesh to the roads. What kind of Mesh for terrain are you using. Is it just like a plane mesh? 2D if so i should be able to add that type of blending into the system as it is the same process for blending to the terrain heightmap.

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