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Chipmunk Physics • View topic - Simulating a tight joint.

Simulating a tight joint.

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Simulating a tight joint.

Postby scorp » Sun Feb 01, 2009 2:39 pm

Recently I was thinking of a way to simulate a joint which won't move until torque reaches certain amount. I guess that can also be described as “adding friction to the joint” or “making it tight”.

My thinking failed epically. :D

Anyone has any ideas?
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Re: Simulating a tight joint.

Postby slembcke » Sun Feb 01, 2009 7:36 pm

You can do it with the joint constraint changes in trunk pretty trivially.

To simulate the "tightness", you would add a simple motor constraint with a speed of 0. You would also want to change the maximum force of the simple motor to be the minimum torque to rotate the joint. I've done this before and it works excellently. Because it's run as a real constraint inside the impulse solver, there is no "creeping" or other issues you would get if you only used forces.
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Re: Simulating a tight joint.

Postby raposon » Mon Feb 16, 2009 4:49 am

I saw your reference to "truck".
What do you mean by that? Is it an example? Where can I find it?

Is there a way to not allow a joint to get stretched?
I'm using a slide joint but it still allows it to be stretched if enough force is applied to it.

Thanks for the library.
I'm having a lot of fun with it.
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Re: Simulating a tight joint.

Postby ker » Mon Feb 16, 2009 5:35 am

that's a typo. slembcke meant "trunk", which is the most recent version of chipmunk in the svn-repository. Take a look at to learn how to obtain this. You will need to compile this yourself. Linux and Mac compilation is pretty straight forward, but it will get messy with windows. Read the msvc thread for windows compilation.
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Re: Simulating a tight joint.

Postby slembcke » Mon Feb 16, 2009 12:02 pm

Oh, whoops. Fixed the typo.

Depending on what is causing the stretching, try increasing the iterations or decreasing the time step. You cannot prevent it entirely.
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