[ODE] Human ragdoll "twist" problem

[Michael Mandel]

I had similar problems when switching to ODE from Tokamak (which I did
because of Tokamak's poor support for controller actuated joints).  I
ended up going with Hinge and Universal joints for the whole body
because I had read that the ball-and-socket joints had a bug in the
AMotor code that would be required to get them constrained (I think
this has recently been fixed in CVS?).  Anyways, what exactly is
"weird" about the movement?  I find things looks OK if I'm pretty
aggressive with the joint limits for the shoulders and legs - i found
that the arms could twist around otherwise.  If people are interested,
I could post a link to a file containing all of the data I supply ODE
when constructing the bodies and joints for a human, including the
proper constraints...

Mike


On Thu, 23 Dec 2004 11:16:44 -0300, Rafael Horbach
<rafael at southlogic.com> wrote:
> I'm having some problems with human ragdoll simulation. We used Tokamak
> in the past, but now I'm integrating ODE with our engine. On the past,
> we've used ball joints for the shoulder, but in ODE the ball have no
> constraints (or I'm missing some important here), so I've used universal
> joints for that. It works nicely for some situations, but the missing
> "twist"on the upper arm geometry makes the simulation very unnatural.
> The same problem on the legs. So  I was wondering, how have you guys
> made the setup of the human joints?
> 
> I'll now try some different joint settings, maybe with angular motors,
> but advise could help :-)
> Thanks
> 
> __________________________________________
> Rafael Horbach (rafael at southlogic.com)
> Southlogic Studios
> http://www.southlogic.com
> 
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