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So I'm still a beginner in blender and I'm trying to make a simulation of a double pendulum. My problem is that the swings keep glitching out of their positions and wouldn't swing properly.

I watched a tutorial about some dynamic rigid body strings (https://youtu.be/ydX7bzLFbTo) and thought it might be cool to make a pendulum with just two swinging objects.

There are three objects in the scene:

  1. The holder - set to rigid body passive
  2. First swing - rigid body active
  3. Third swing - rigid body active

There are also two additional empties set to hinge constraint that act as pivot points between the objects.

Blend file:

The setup

Some weird behaviour

This is what happens when I press the play button for the simulation.

I tried setting the objects so that they don't intersect, got the same result.

If I don't use hinges but points, the same thing happens but also in other axes.

I ran out of ideas so I hope someone could help me with this one.

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    $\begingroup$ For simulations always make sure you ‘Apply Scale’ on any meshes that have been resized - this really can make all the difference. $\endgroup$
    – Rich Sedman
    Commented Oct 10, 2021 at 20:18
  • $\begingroup$ See also Double Pendulum in Geometry Nodes $\endgroup$
    – Markus von Broady
    Commented Jan 18 at 15:39

1 Answer 1

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UPDATE: I somehow managed to get it working. Not sure which setting it was because I changed a few and then tested. I believe the problem was that the size of the model was too small.

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    $\begingroup$ wow, congrats! i didn't make it. And i never had thought that this would work, without parenting the second hinge.... $\endgroup$
    – Chris
    Commented Oct 10, 2021 at 16:36

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