Ex.gh (199.9 KB)
How to create an extrude or sweep of the attached section on curved lines.
Dear Osin,
In categories (of the forum) also add Grasshopper. You will get more/sooner reactions, because your question is specific about Grasshopper.
When there is an error, check the small red label. This explains what is wrong (not always, but now it does 
). Sweep1 cannot sweep surfaces, only curves.
The extrude along as you used below, as work with surfaces. As you have found yourselves.
We Can Make Extrude Sir ???
yes, use Extrude Along.
I’m doing Extrude along , but the profile shape is changing. I want to maintain the shape and dimensions of the section.
if you want to use sweep1 , you have to use curves and not a surface.
- Bring your object back to curves only.
- place perpframes on your rail.
- orient your object to these frames.
- feed all to sections of sweep1
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@Osin - When you show this to the curtain wall manufacturer to get a quote, please take a photo of their face 
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Lines are actually never curved….
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