Using scripting to generate meshes over time

[_Aka_]

Hi

Thanks a lot for the compliment

I thought of some more solutions, but not sure they would succeed where the ones you mentioned failed:

You could use a Variable Mix Shapes module, to combine two shapes, one for the normal track, one for the appearing one
You could use the Scale tab of the Shape Extrusion module
You could use the TRS Path module to move the path above/under ground

Did this help?

Have a nice day