Hi Grasshopper community! I’ve been trying to write a script that generates geometry similar to the diagram below. The concept is that there are positive and negative “ions” that determine how the “rubber band” then loops around them. I am a little bit stumped off the bat but I have managed to get …

[2023-12-06 13_17_45-Window] rubber band circles v2.gh (17.0 KB)

Line.TryCreateBetweenCurves method (rhino3d.com) This is a good starting point to get the tangent lines between the “ions”. And here is a discussion on a similar topic: How to find external tangents between two closed planar curves (not circles)? - Grasshopper - McNeel Forum

The positive/negative sequence cannot be arbitrary, it mostly is a consequence of the angle of the corners of the starting polyline (passing through circle centers). Then, if the circle radius is big enough it can “flip” the shape in some places… but mostly you could pre-determinate the positive/neg…

Kangaroo? Don’t have the time to try right now. maybe later. :slightly_smiling_face: :thinking:

We have not the same logic, yours is very good. For the moment my little component gives that. [image] In order to draw “outer” parts I use the convex polygon. If 2 consecutives points are on the convex polygon I draw the line. [image]

That make sense. It’s a totally different scenario: i have circles, already in the correct sequence or i have circles, i don’t know the correct order, please sort them …yours do a task more!

Thanks for the help @maje90 & @laurent_delrieu ! This is fantastic :zap:

Hello I added some components in Nautilus plugin. There is still my old method and the one from @maje90 . As I wanted some automation to have some quite good “polyline” I implemented a pseudo TSP from a Mesh. I say pseudo because my tool doesn’t take all the points of the mesh. But it is quite cool…

What if the turning points are ellipses instead of circles?

:thinking: standard sizes? ellipse orientation?

"Rubber-band" Grasshopper Script - Help!

Grasshopper

maje90 (Riccardo Majewski) December 6, 2023, 12:18pm 6

rubber band circles v2.gh (17.0 KB)

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"Rubber-band" Grasshopper Script - Help!

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