[ODE] How to Avoid Walls when using 4 spheres and box for a Car

[Sean S Cullen]

Give your car two objects for representing the wheel.  A sphere that
collides with the road surface, and a box, that doesn't rotate, for
colliding with the walls.  Ignore collisions between the sphere and the
box, ignore collisions between the sphere and the wall, and ignore
collisions between the box and the road surface.

> Sorry for the long topic name, but that is my question...
>
> When i use 4 spheres for the car and i get near to a wall the car goes
> up trying to climb the wall. Is there any way to avoid this?
>
> I know that a possible solution could be to make the box for the car
> bigger than it is, but i don't want to use this because then the car
> collides with nothing (space between the wall and the real body car).
>
> any help please?
>
> Thanks in advance!
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