Hello, everyone. I am a beginner with Grasshopper, and I would like some help learning how to extrude a profile along a rail. I apologise in advance, as I think this is a common problem that has already been solved many times on this forum, but I cannot solve the problem or understand how to do it b…

[image] René Corella: Sometimes @Volker_Rakow likes to trick you :winking_face_with_tongue: I am not trying to trick anyone. I just sometimes don’t know know WTF I am talking about and need to be called out on that. Sweeps are decievingly complex and confusing to me. I understand that the pr…

Thank you Tom for your time, but this is not the geometry I want. I need a geometry with the correct dimensions of the profile in the file I drop in my orginal file. In addition, I notice that your geometry shows changes in the orientation of the profile on the different segments of the rail, but I …

[image] Volker_Rakow: I am not trying to trick anyone. I just sometimes don’t know know WTF I am talking about and need to be called out on that. Sweeps are decieving complex and confusing to me. I understand that the profile follows the curve frame and that that often causes the profile to twi…

[image] Raoul : is not the geometry I want so please sketch what you re after. my approach is like cutting a wooden profile. the section is the same for all segments. the angles of the cut are defined by the mid-angle-plane between two segments. [image] Raoul : orientation of the profi…

[image] Raoul : I want to keep the original orientation of the profile along the entire length of the rail and have a trimmed geometry at the intersections. I am glad I can now know what you want :wink: @Tom_P has both the answer and the question. This ‘original orientation’ of your rectang…

So firstly, [image] René Corella: And, that you don’t want ‘trim’: No, I meant that you want trim. Trim will rotate the profile against the curve frame so that it arrives at the corner in an orientation that can be mitered with the subsequent section of the rail. In my version this works: […

Or you can insert 90 degree connector segments.This is what is done with railings. [image] Pipe with Ellipse ends Grasshopper I fear that what you want to do is geometrically impossible. Consider the following segment extrusions where the planes have been ori…

[image] Volker Rakow: Or you can insert 90 degree connector segments.This is what is done with railings. I played with that but hit a wall right away with the ‘found’ planes of what you wish would be beautiful ellipses resulting from a basic pipe, but they won’t be :frowning: — however, also:…

[image] Volker Rakow: the fact that Raoul cannot upgrade his Rhino to the current version gives me suspicions about the type of program he is working with. To be fair, he might be in an educational environment where Rhino is provided in a lab or via VPN, without user control over updates.

How do i realise that sweep profile along a 3D closed polyline

Grasshopper

René_Corella (René Corella) November 30, 2025, 1:29pm 24

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How do i realise that sweep profile along a 3D closed polyline

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