There is this:
http://felixpalmer.github.io/lod-terrain/presentation/
There is this:
http://www.babylonjs-playground.com/#f00M0U#39 that needs to be refined if you are gonna use it.
I think @JCPalmer had a terrain thing too unless I’m getting him mixed up with someone.
Basically any standard method will work you will just have to work up the system as we do not have a “set” method for it.
Babylon js is a webGL rendering tool, not really a level design system or game editor etc. you have to kinda script that functionality yourself or convert from other engines. There is lots of people that have examples of how to do it though.