[ODE] I have buckling joints with 4 wheeled vehicle

[Megan Fox]

Carworld is the example you want to base your code off of... and it's
available here: http://www.mindcontrol.org/~hplus/carworld.html
(thanks... Jon?  I think?).

Extremely stable, well-constructed, good "feeling" car.  Mind that it
does a lot of other neat tricks, like biasing the handling so that
your car doesn't roll at the slightest hint of a corner - which would
doubtless be your next question, once you got this aspect worked out.

-Megan Fox

On 6/9/05, dan at auscoders.com <dan at auscoders.com> wrote:
> Ive set up a rear wheel drive 4 wheeled vehicle based on the buggy sample in
> the ODE docs, and have been trying to tune it so the rear wheel pair will
> manager to stay straight with the vehicle forward axis. They tend to stray
> when the velocity vector and the vehicle forward axis are not close, (this
> happens by taking a hard corner at speeds / doing burnouts and that type of
> stuff)
> 
> I have put a link to a couple of screen shots showing what happens when the
> vehicles forward vector and it velocity vector are far enough apart. Once
> the two vectors approach each other again the rear wheels sort themselves
> out. But when the force is high the look (and handling) is one of the joint
> bending or buckling under the forces along the vehicles X axis.  I use a
> coordinate system of X is Right, Y is Up, and Z is Forward;
> 
> I have tried setting the hinge CFM/ERP to 0.0/1.0f respectively and it made
> no difference to the sim. I also used the stops shown in the buggy example
> these still made no difference.
> 
> The images can be viewed here
> 
> www.auscoders.com/odevehicle/wheels1.jpg (36k)
> www.auscoders.com/odevehicle/wheels2.jpg (39k)
> 
> Ahh I have also put the cpp|.h|.config file up there as well, feel free to
> take a look if you want to dig that deep
> 
> www.auscoders.com/odevehicle/wheeledvehicle.cpp (17k)
> www.auscoders.com/odevehicle/wheeledvehicle.h (1k)
> www.auscoders.com/odevehicle/gt40_data.txt (1k)
> 
> If anyone can view the pictures and has an idea / knowledge on the fix I
> would really appreciate the help.
> 
> Cheers,
> 
> Dan S.
> 
> 
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