[ODE] Universal joint error and wiki query

Michael Jones m.pricejones at gmail.com
Tue Aug 1 05:54:13 MST 2006

You're right, Remi pointed it out as well, I should have added it to the
thread. Setting the first axis makes it parallel to the default value of the
other axis which results in an error.

I'll add the information to the wiki, just wanted to check as im new to the


On 7/31/06, Jason Perkins <starkos at gmail.com> wrote:
> On 7/25/06, Michael Jones <m.pricejones at gmail.com> wrote:
> >  And it produces the following runtime warnings once at the start of the
> > program:
> >
> >      ODE Message 2: zero length vector in dRFrom2Axes()
> >      ODE Message 2: zero length vector in dRFrom2Axes()
> I haven't used the universal joint myself, but this could mean that
> your rotation axes have become parallel? You say it only happens once
> - is it possible that the simulation is getting stepped before the
> joint is fully configured? Not sure, just throwing rocks in the dark
> here...
> >  Also, is there is reason why the dJointGetUniversalAngle1 function is
> not
> > documented in the wiki?
> We are trying to document the whole API with Doxygen, and you can see
> that work in progress here: http://opende.sourceforge.net/docs/. But I
> don't think it has been documented there yet either. I was heading up
> that effort but have been short on time for it.
> If you feel so inclined, adding it to the wiki docs would be a big help.
> Jason
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