Why does this mesh needs rebuilding? And how in Python?

@Holo wrote:

Hi guys, I have a scritp that builds simple roads on mesh terrains:

image874×542 206 KB

But the road looks bumpy until I run the “RebuildMesh” command, and then it looks like this:

image897×571 203 KB

What I do:
start with a mesh, pick a curve, coerce a mesh in Python and adjust vertice data according to the curve and then replace the original mesh with the altered version.

So how can I automatically get a smooth LOOKING road?
It already IS smooth, it just doesn’t look like it and unwelding and rewelding doesn’t help, and neither does recalculating mesh normals

Thanks for any help.

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