How do you find the edge of a mesh?

[jerome]

another simple fast way CPU side (the simplest actually) :

if your edge is one of the ground widths : the first subdivisions+1 vertices are on the edge. So, for the whole mesh the first sub+1 and last sub+1 are the edges.

if your edges are the sides of the ground (the heights) : 

left side : all the vertices with an index stride of sub+1 :0, sub+1, 2 * (sub+1), ..., (sub+1) * (sub+1)

right side : the same but starting at index sub : sub, 2*sub+1, 2*(sub+1)+sub, ..., (sub+1)*(sub+1)+sub

if i''m not wrong 

[NasimiAsl]

16 hours ago, Dal said:

I like your approach doing it on the GPU. If it works that will be the fastest way for sure.

http://www.babylonjs-playground.com/#1X1MV3#13

http://www.babylonjs-playground.com/#1X1MV3#15

step 1 : LOD Simulation  : Done

[Dal]

9 hours ago, NasimiAsl said:

http://www.babylonjs-playground.com/#1X1MV3#13

http://www.babylonjs-playground.com/#1X1MV3#15

step 1 : LOD Simulation  : Done

Wow! This is really awesome! I am impressed.
It looks really good on my PC. The bad news - performance on mobile seems even worse than my groundmesh based solution so far. Hope it will be possible to optimize it.

[NasimiAsl]

yes you can customize it for find a best optimization