Position purlin on curve

Hi everybody.
Today i have a problem need help please
I want to adjust the purlin in the direction of the arc, how do I do that?
Thank all.

You’ll have to create planes which are perpendicular to the arc.

If you can’t figure out how to do this, go through the Modelab Primer

Then look at this example: Sweep many rails with profiles - #2 by HS_Kim

I found it with this search: Search results for ‘beams oriented’ - McNeel Forum

In case you are still stuck, please post your Rhino and Grasshopper files.

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Thanks a lot. I will try

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3. Attach minimal versions of all the relevant files


PURLIN for arc check.gh (16.2 KB)
PURLIN FOR ARC.3dm (34.4 KB)
I tried but no result. Please help me, thank you so much.