Basic Hinge animation

Hi all

I was trying to simulate a typical folding structure with Kangaroo, but looks like I cant

make it work. Im totally new with Kangaroo and I've seen this basic tutorial

http://vimeo.com/20308963

but I cant make it work with the Hinge tool.

Could anybody tell me how to make this 2 triangles fold as I show in this screenshot?

Below are the grasshopper definition I've been trying to do following the Kangaroo basics video, and the two triangles 3dm file.

Thanks

Attachments:

hinge_basics.gh, 3 KB
hinge_basics_triangles.3dm, 17 KB

Replies to This Discussion

Permalink Reply by Daniel Piker on December 30, 2011 at 10:08am

see the attached definition for a fixed version

The hinge force alone does not keep the edge lengths of the triangles fixed, so I added some springs.

Also, the geometry input needs to be converted into lines to work.

Attachments:

hinge_basics_fixed.gh, 5 KB

Permalink Reply by Nacho35 on December 30, 2011 at 10:18am

Hi Daniel, thanks for your quick answer

I've opened your definition and I get a red warning, but no idea why does that happen

Its probably a stupid question, but as Ive said Im totally new at this

Permalink Reply by Daniel Piker on December 30, 2011 at 10:37am

Try switching the Reset toggle to True then back to False again.

Kangaroo always needs to Reset once to initialize the the simulation before playing it.

Permalink Reply by Nacho35 on December 30, 2011 at 2:18pm

Ok, now I get it, its working great!

Another thing I wanted to ask is how the rest angle works, because it seems that the triangles fold exactly half of the angle I choose.

For example, in this pic I set 90 degrees and it seems to fold 45

in this picture I set 45 degrees and it seems to be folding 22,5

And another interesting thing is the result of setting an angle bigger than 165 degrees, aprox. The structure begins to rotate 360º and it never stops. Below is the definition if you want to see what Im talking

Is there a specific reason why this happens?

Attachments:

hinge_basics_fixed.gh, 5 KB

Permalink Reply by lorna jackson on October 28, 2014 at 1:29pm

I have been following this thread and so far it has been really helpful, I have posted a thread question regarding multiple hinges being used in one script if you could possibly take a look.

http://www.grasshopper3d.com/forum/topics/multiple-hinge-points-in-...

Thank you in advance

Lorna

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