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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Rigid frames

by Danijel Ivanusevic

Feb 10, 2011

Hello,

Often when I'm trying create some model, i want to have rigid elements. But when i use very high stiffness springs (over 1e7 for example) model collapses. I've tried using small time steps an so on but it doesn't work. Is there a way to create very rigid frames without using springs or bend resistance (also doesn't work)? If not, will there be in the future?

Thanks.

  • up

    Daniel Piker

    Hi Danijel,

     

    It should be possible to simulate spring stiffnesses even over 1e7 if you make the timestep small enough.

    (I'd suggest something like 2e-4). Of course smaller timestep means slower simulation. You can increase subiterations (to say 60) to counteract this a bit.

     

    And yes, I am hard at work on some new techniques aiming to improve things so that significantly stiffer springs will be possible in Kangaroo while still keeping a reasonable simulation speed.

    Feb 11, 2011