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Chipmunk Physics • View topic - Anchor point for pivot joint

Anchor point for pivot joint

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Anchor point for pivot joint

Postby kolis » Fri Jan 04, 2008 7:19 pm

A small feature request. It would be nice to be able to set anchor points for the pivot joint, and it would also make it more consistent with the other joint types.
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Re: Anchor point for pivot joint

Postby dc443 » Fri Jan 04, 2008 9:33 pm

Does a Slide joint with min and max distance set to zero function in the same way? It should.
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Re: Anchor point for pivot joint

Postby dc443 » Fri Jan 04, 2008 9:39 pm

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Re: Anchor point for pivot joint

Postby slembcke » Sat Jan 05, 2008 4:48 am

1) You'd think so, but a slide joint with min/max set to 0 is not the same. Slide joints only work on one axis. You have to solve the constraint differently if you want it to work like a pivot. It probably would work, but I'd think it would be much less stable.

2) The reason why you only get one point for pivot joints is so that you cannot initialize the joint to an invalid state. If the anchor points are too far apart when you create the joint, it would pretty much explode (in the numeric sense) and maybe never recover.
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