A Terrain LOD with QuadTree in ECS ?

How would you go in doing a terrain quad tree based LOD ? Something ROAM, or this : https://www.gamasutra.com/view/feature/131841/continuous_lod_terrain_meshing_.php?page=2.

First, what would be an ECS friendly or cache-friendly way to structure a quadtree? Or even a good way to make the tree without reference types ?

Also, how would you deal with all the "horizontal dependencies" in the tree (dependent activation of vertices) ?

I know the question is a little big vague, I just don't know where to start.

 

There is job-system-cookbook-master.zip on github I believe. There was some example, about mesh manipulation.
https://github.com/stella3d/job-system-cookbook
But I think there was some error, out of the box, with Unity 2018.2.

 

This reference is very cool thank you! But this is still the easy to undersand and easy to frame into the ECS framework type of application : parrallel, very vertical with few horizontal interactions...