Hello All, I would like to get centreline of closed polylines, though its not centre always as it adapts to other centelines linearly. I have attached image for reference and also geometry to test it. Is there any gh component to achieve this? please help!! [centreline-query-01] centreline-query-…

This is very interesting almost linear except at meeting points. Thanks for the definitiion

Hi, if you could convert your geometry to rectangles, applying the solutions from your previous discussion, then it is easy. Divide surface based on corners . It is easy to extract the center line of a rectangle.

Tried Laurent definition works good though its not linear even if I seperate to boxes

Separating to boxes would enable you to use another approach that would give you everything linear.

Am not getting it clear what you say. I tried with closed plines rectangle still not linear enough

For sure [image] ShynnSup: It is easy to extract the center line of a rectangle. But after that it is not so easy !!!

What settings should be used for bigger objects like stairs stringers? I’m trying to find a “centerline” which could help for automatic placing cups on a cnc router: center_lines_frompolylines_rectangles (1).gh (27.4 KB) I’d like to have a curve like your “C” shape example.

Hello I am not sure I understand your question, what is sure is that my script doesn’t accept more than one curve at once ! I didn’t try to implement the logic for multiples curves. It is doable but takes time. If it is not that can you draw what you are after ? [image]

Thank you Laurent, Ok for the single object, it works better indeed, (however in my case, grafted list of polylines would be useful :slight_smile:) Here is examples what I am looking for: [image] [image] [image]

Here an updated script, it works with multiple curves, I added some slider for curve simplifications, … Hope the naming are quite explicit. But It isn’t a 100% all what you want script ! [image] [image] center_lines_frompolylines_rectangles_v2.gh (26.4 KB)

Extract Centreline of polylines

Grasshopper

ShynnSup (Shynn Sup) June 24, 2019, 11:54am 22

Hi, the reason is that the curves you inputted as rectangles are not so tidy. I created new rectangles from your curves by generating the bounding box of each one.

Boxes Axes_v02.gh (20.3 KB)

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Extract Centreline of polylines

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