not sure I fully get the question ??? but the edgesRenderer might be what you are looking for.
That is what I need
I seem to have missed something.Babylon.js Playground
It has no effect on both sides of the cylinder.Do you have any idea ?
It only impacts where there is a sharp change of normals unfortunately so in your case using a highlight layer in edge mode might be better ?
In the constructor options you can put isStroke to true
Thanks ! isStroke is worked. hightlight can do it .https://playground.babylonjs.com/#U8BCGJ#1