Kangaroo

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Kangaroo is a Live Physics engine for interactive simulation, optimization and form-finding directly within Grasshopper.

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kangaroo settings

by Mi*Ma

Apr 26, 2011

 

hi
all, could somebody help me whit kangaroo settings


i have
this structure made of interactive connected beams,
wat i
want is to preserve the connectivity and structure of this beams( the lines
have to stay straight) after moving the top points, the problem is i didn´t
find the right settings for it( i hope thats possible),
the
best what i get was straight lines in top-wiew but in perspective or site-wiew
was the lines whit kinks( the lines have to be straight in all dimensions).have somebody
any idea for the settings or other way to reach that ?

Thanks a lot for a help



 kangaroo settings?

i have this structure made of interactive connected beams, wat i want is to preserve the connectivity and structure of this beams( the lines have to stay
straight) after moving the top points, the problem is i didn´t find the right
settings for it( i hope thats possible), the best what i get was straight lines
in top-wiew but in perspective or site-wiew was the lines whit kinks( the lines
have to be straight in all dimensions). have somebody any idea for the settings
or other way to reach it ?

  • up

    Jon Mirtschin

    Not the result your after, but possibly of interest to you anyway.

     


    I've recently been enabling the Oasys GSA force density form finding solver to be utilized from Grasshopper, so I thought I'd post it's results for your model.  I haven't tested, but I've got a feeling your problem might be over constrained to keep all members straight.  Will see what others say.
    I hope to enable this for other analysis programs shortly.
    Cheers,
    Jon

    5

    Apr 26, 2011

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    • up

      Daniel Piker

      Can you clarify the result you are after ?
      Do you want the connections to slide along the rods?
      Or is the whole thing supposed to form a pin-jointed mechanism ?

      You can decrease the amount the rods bend by increasing the bending stiffness (if it becomes very high, you will need to reduce the timestep accordingly to keep it stable), though as Jon says, it looks like it might then not have any freedom to move at all.

      If it is a question of sliding constraints, then I think this can be added without too much trouble
      7

      Apr 28, 2011

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      • up

        Michael Hickey

        Hey Guys, I just stumbled actoss this conversation and realised it was the closest solution to a question i have. Im doing a project at the moment and using kangaroo to form find. We are making a frei otto chain moddel for a roof. I have the kangaroo model working which is great. Our Uni has GSA but hasn't got the form finding lisence with it.

        The main problem i have is that say for simplicity, that i only have one sting and hang it. I can change the load on it and the stiffness of it in grasshopper to make the catenery shallow or deep, but i don't know what the optimum arch should be.

         

        I was wondering if you guys would have any idea of how we could determin this, or even have any idea of how loads and stiffness in kangaroo are related to real life.

        It'd be great if you had any idea at all.

        Regard,

        Mike

        2

        May 12, 2011