Idea for back face culling on lines

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Idea for back face culling on lines


Everything is in the title!

I need to work with model layers in terrain-map mode and with depth-test deactivated.
The backface culling prevents from drawing the polygons when at the hidden side of the globe.
But i don't find a build-in solution for lines...

I don't want to make them polygonized lines as it will increase the number of vertices.

I think I can do it with a shader (result of the dot product from look vector and vertex can be used to know if the vertex is visible or not). I don't know if there is an easier way. I also wonder if the performance will not decrease with that shader (I have close to 150 000 points).

And, can I do something with the clipping plane?

Thank you for your help,