How to make the planes parallel to the structure?

I want to planes parallel to and on top the structure

Grasshopper_Oc.gh (12.1 KB)

You have a Divide Surface component in your script. Just use the plane normal and connect the points and the normals from Divide Surface to Plane Normal.

But ,Don’t you agree with me that there is a problem with the surface itself? :thinking:

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I got it, thank you :)))))