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Chipmunk Physics • View topic - Spiral springs

Spiral springs

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Spiral springs

Postby ioannis » Tue Nov 17, 2009 9:46 am

Is there a way to model spiral springs, like those in mechanical watches ?

thanks
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Re: Spiral springs

Postby slembcke » Tue Nov 17, 2009 10:50 am

The trunk code has damped rotary springs. If you are using 4.x, it's pretty easy to calculate and apply the rotary forces.
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Re: Spiral springs

Postby ioannis » Tue Nov 17, 2009 1:06 pm

thanks.

Since cpDampedRotarySpringNew doesn't specify anchors, does it apply to the centre of the bodies? Also, I want it to be fairly stiff, so it gets back to its resting angle quickly and stops oscillating quickly (high dampening). However, even with dampening is set to 1.0, it keeps on oscillating for a long time. If I'm not mistaken, dampening values higher than 1.0 are a bad idea, right? What can I do about that?
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Re: Spiral springs

Postby slembcke » Tue Nov 17, 2009 2:26 pm

The rotary spring constraint only changes rotational properties. If you want them pinned together as well, you'll need to add a separate pivot joint. It is quite normal to use a damping value greater than 1.0 unless your objects have a very low moment of inertia.
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Re: Spiral springs

Postby ioannis » Tue Nov 17, 2009 3:30 pm

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Re: Spiral springs

Postby slembcke » Tue Nov 17, 2009 3:50 pm

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