Kangaroo

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Description

THIS FORUM IS NO LONGER ACTIVE. PLEASE POST ANY NEW QUESTIONS OR DISCUSSION ON:

https://discourse.mcneel.com/c/grasshopper/kangaroo

The discussions here are preserved for reference, but new questions posted here are likely to go unanswered.

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

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Torsion

by jjsolly

Feb 17, 2015

Hi all,

Has anyone managed to simulate torsion of a bar/spring represented by a curve in Kangaroo?

Cheers,

James

  • up

    Daniel Piker

    Hi James,

    In the current public release of Kangaroo, one possibility is to use the "Mirror" force on consecutive sets of 4 points along a curve. The effect is similar to that described by Adriaenssens here http://opus.bath.ac.uk/35150/. However this only works well on curved members because of how it ties to the curvature.

    In the upcoming version the options are improved though - you could make each node a full 6dof rigid body and get the beam stresses from the relative orientations of each end.

    Or it should also be possible to use the Bishop frame and model torsion/anisotropic bending with just a single additional scalar per 3dof node, along the lines described here: http://www.cs.columbia.edu/cg/rods/.

    1

    Feb 17, 2015