Kangaroo disjoint lines

Grasshopper
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1

Hello,
I’m working on several ways to create tensegrity cells. Those are made by pure geometric equilibrium to i’m using kangaroo solver to get the right shape.

tensegrity%20okay

One of the ways to create such geometry is to make all the blue lines in this pattern the same length as well as the red lines.

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image.png1626×411 49.5 KB

Unfortunately, when I do, the result is absolutely wrong. I suspect that it’s because of the disjoint lines that kangaroo moves independently from one to another. In the initial pattern each junction as got 4 lines (for the extremity nodes the fourth line is one joining them so it’s hidden behind the other smaller lines)

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image.png773×386 28 KB

I don’t understand why it happens as the other scripts work fine.

If anyone has got an idea of how to join all the lines it would be super cool !

Thank you in advance !

tensile cell form finding.gh (65.4 KB)

2

Is it just that one set of lines is not connected to the Length goal?

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image.png1023×614 105 KB

Also, for something like this that starts all in one plane, but is supposed to end up 3 dimensional, you might need to add something to nudge it out of plane. With the regular solver this can be done with a grab component, or you could add some tiny initial displacement out of plane to any of the points.

1 Like
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Oh my god …
This was a quite stupid mistake I just didn’t notice …

But thank you ! I indeed forgot to plug the component in. After I moved some of the point I still don’t have the good result but the geometry isn’t planar anymore. Now, it’s probably a matter of few adjustment. :grin: