[ODE] Freely rotating wheel?

[Megan Fox]

Just clarifying a detail here - you're saying you're "setting the
dParamFMax value", or setting the Hi and LoStop, but you're not
specifying to which axis you're setting them.

In this case, for instance, I assume you would want some stops on the
"vertical" axis, assuming this is a wheel that is meant to turn, and
you would certainly want a different FMax on either axis.

... that said, I get the impression all you want is a drive wheel,
with steering in the front - so why not just use a Hinge, with its
single axis oriented as your drive axle?  Orient the axis properly,
disable the Hi and Lo stops, set a reasonable FMax, attach a motor,
and you should be good to go.

-Megan Fox

On 5/25/05, Diana Harsh <di at pringo.com> wrote:
> Hi,
> 
> New to ode here.
> 
> I'm trying to simulate a vehicle which has two driven wheels (left and
> right) balanced by a third, freely rotating, dolly wheel to the rear. The
> two driven wheels seem to work fine using hinge-2 joints. However I can't
> seem to set the dolly wheel to rotate freely. The simulation looks like it
> is dragging the wheel and this causes the trajectory to waffle all over the
> place, eventually fliping the vehicle.
> 
> For the dolly wheel I have used a hinge-2 joint. I have set the dParamHiStop
> and dParamLoStop to infinity (so there is no limit to their DOF on the two
> axis). I think the problem may be with the dParamFMax value. If I set it to
> 0, it seems to definitely drag the wheel. If I set it to a large value, it
> works but continues to upset the trajectory.
> 
> Any suggestions to make it rotate freely? Is this even my problem?
> 
> Thanks in advance,
> James
> 
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