curve capable roads

[kfarr]

approach 0: (current)

• naive plane-based, does not support curves;

approach 1: https://glitch.com/~aframe-threeg-road https://glitch.com/~threeg-road https://github.com/hofk/THREEg.js/issues/2

• note this still does not resolve curb issue

approach 2:

• bend a mesh with this tool https://github.com/zz85/threejs-path-flow