[ODE] strange hinge joint behaviour: bug?

Remi Ricard remi.ricard at simlog.com
Wed Nov 15 08:24:22 MST 2006

Hi Mauro,

> Hi,
> 	I created a hinge joint between 2 bodies: b1 and b2.
> dJointAttach(joint, b1, b2);
> I set the joint parameters (anchor axis and so on).
> I set LoStop=0.0f and HiStop=2.0f.
> I fixed b1 to the environment with a fixed joint.
> The joint works but if I attach b2 directoly to the world
> dJointAttach(joint, 0, b2);
> with exactly the same joint parameters, the joint lets b2 rotate in the
> opposite direction; as if i changed LoStop to -2.0f and HiStop to 0.0f.
> Has anyone else experienced the same behaviuor?
> It seems strange to me but I'm not really sure It is a ODE bug.
> I'm using a recent ODE SVN version.

When you attach only one body to a joint. The body is "moved" to the 
first "node" of the joint and it is considered as body1.
So the inversion of rotation is almost normal knowing the move.


More information about the ODE mailing list