Having recently purchased and started using Rhino for the first time, I have already had some success using Grasshopper to extrude a closed curve a specified distance in the direction of a vector. However, I am having trouble extruding or sweeping a closed curve along another closed curve. For examp…

[image] eheliot: what am I doing wrong? Without posting your code, how are we supposed to know what you’re doing? [image] Help Us Help You Grasshopper Asking questions and getting answers is what this forum is all about. Although people are generally very helpful, …

Hello Joseph, Thanks for your reply. I made the mistake of relying on the Grasshopper Help, which does nothing to explain how these functions work. I managed to figure it out on my own this time, but in the future I will consult the Rhino Help instead. Sincerely, Ehben [image001.jpg] [image002…

In the future, if you start another thread, I hope you will post GH code with your geometry so readers don’t waste time guessing at specifics or begging you to do what the guidelines suggest. A GH model is far more informative than words or images alone. Subtle details matter very much!

I may have spoken too soon. When I tried to move forward with my plan, I ran into more trouble. What I want to do is define a section programmatically, then [sweep? extrude?] the section along a collection of given curves, while maintainting control over the attitude of the section as it travels al…

Both of your GH files have six copies of Sweep 1, which makes a lot of extra work just to study what you’ve tried, let alone discuss it. Everything in Sweep1.gh makes sense to me, how about you? In Sweep44.gh your rectangular rails are rotated out of the ‘World XY’ plane in both directions (around…

[image] Joseph_Oster: At this point, I would take an entirely different approach by creating just one of these things in the World XY plane and then doing rotations and/or move/orient of the completed sweep polysurface to match the four rails. Like this. Hasty, not elegant, but it works, eh?…

Thanks for digging into these. Sweep1 - Most of it makes sense, but a few of them do not. Here are the rails and sections for sweeps I highlighted in my previous post. There are three different attempts to sweep one section along two rails: The rails start parallel with eachother in the plane o…

Update: There seems to be something to do with the location of the seam of the section curve. If it lies at the start of the rail, everything appears to work, if it does not, nothing does. [With ONE exception. MD Slider = 1.57,0] However, how does that fit in with what is going on in Sweep1, where …

[image] eheliot: what exactly is the difference between sweep and extrusion anyway? :man_facepalming: [image] eheliot: As far as the method of creating points goes, I figured that since a point can also be considered a zero length vector, I trusted Grasshopper to deal with it. So far so …

In a nutshell, can anyone explain why this system is unstable? [image] Try the sliders and you will see what I mean. [image] Or, how can I modify this system to ensure its stability? This gets back to my original question: What are the rules for positioning a section relative to a rail to guara…

Extrude or Sweep Closed Curve Along Closed Curve

Grasshopper

Joseph_Oster October 4, 2021, 9:56pm 2

Without posting your code, how are we supposed to know what you’re doing?

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Extrude or Sweep Closed Curve Along Closed Curve

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