Flat multipipe?

[dfytz1]

I am making pathways on a terrain, and I like the shape I get from the multipipe component, looking from above. How can one achieve the same shape, but flat?
flat multipipe forum.gh (19.2 KB)

basically i am looking for this:

partially, the problem is i do not know how to sort subd control points

[martinsiegrist]

Here’s one way by culling the mesh faces with normals facing down…

road_on_terrain_subd.gh (38.1 KB)

[dfytz1]

Thank you Martin! The result looks very similar to what I was trying to make, thanks for pointing direction.