This asset is an editor extension.它可以很容易地在地形上制作道路。你只需要设置贝塞尔线并按下按钮
It makes roads on a terrain easily.
You just need to set bezier lines and press button.
Online document
-- ver 1.3 : now available on Unity 2020.3.0f1 and an extra.
-- ver 1.2 : painting option is now available.