Extruding items by a number of different lengths

Grasshopper
1

Hi all,

I think I have a simple problem but I am running into the edge of my knowledge in Grasshopper. I have created a series of extrusions that get their length from a surface that I created using Kangaroo. This lead to a high number of extrusions all with different lengths. Since this piece will eventually be fabricated, I am trying to normalize the length of these extrusions into a series of set lengths that I have identified. See the process below.

image
image1920×1386 131 KB

By taking the long edge of my extrusions I can get the overall length of the rod and then round that number to the nearest length. However, when I go back to re-extrude the rods using the new lengths the lists appear to be taking a single value instead of matching the two trees together and giving the correct value. See below.
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image1920×1041 116 KB

Any ideas on how to make these lists match so the shapes extrude by the new rounded values in the right place?

Thanks in advance!

20250403_extrusiontrouble.gh (41.6 KB)
20250403_extrusiontrouble.3dm (10.7 MB)

2

Happy to have a look. But I don’t want to install plugins, just to be able to see how it works. Please isolate the issue, by just working with a small part of your gh file.
(Put in some geo components and internalize data)

3

I would solve it this way, but I don’t know if you have other needs.
20250403_extrusiontrouble a.gh (238.2 KB)

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image2019×340 88.8 KB

4

Leopold, thanks man this gets it done! I dont totally understand how this is different from what I was doing besides the intersect brep point. Wouldn’t the z of the edges give me the same length? Appreciate any explanation in case I encounter something like this again in the future.

5

My definition was just to remedy this problem.
That’s fine tooa z of the edges, but it seems less simple to me.