How to make ribs from surface?

I am trying to make ribs structure from surface (image below)

What the best way to do that?
I thought maybe the surface.getisoline would help me, but I don’t understand how to make it with multiple curves all over the surface

the idea

Surface.GetIsoline is working as expected. Show us your complete graph with errors expanded.

1 Like

This should also help:

http://dynamoprimer.com/en/06_Designing-with-Lists/6-4_n-dimensional-lists.html