>> looks great! The only point where it looked a bit jerky was when
>> driving up the stairs. With the steering / braking system, do you
>> mean you set the position / forces of the front wheels and the car
>> follows it based on friction with the ground?
>
>    Thanks to Koppi addition of definable keyboard shortcuts, I was able
> to assign a key for acceleration, another for braking, and two more for
> the steering to left and right:
>
>    + the acceleration key just applies some angular speed to the tires,
> which rotate freely around a hinge constraint. Using high friction on
> the wheels and the ground, the car starts rolling...
>
>    + the braking key cuts the power and also blocks the free rotation of
> the wheels hinge. Again, friction does it's work and the cars stops
> reasonably well.
>
>    + the left/right keys turn on the motors of a pair of hinge
> constraints attached to the wheels, on the appropriate direction. I
> didn't need to implement any sort of differential... still don't know
> why, but the car acts as if there is one. For the rest, I totally
> disregarded any other things like caster, camber, toe, ackerman, etc...
>
>    Apart from that, there is a simplistic suspension joining the steering
> hinges with the chassis: this is where most of the failed attempts were
> wasted, trying to find a combination that worked well and didn't break
> under the forces involved.
>
>    Oh, ...and the jerky moment at the stairs was me pressing left/right
> to find a better attack point, as the power was not enough for a frontal
> approach... :)
>
> --
> jaime
>
>
Unless you modeled some rigid link between two wheels you don't need to 
model any diferential. The motor wheels are powered indepently and can 
rotate at different speed as needed.

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