>Can someone please explain this to me: what exactly is linearity in
>GPL? I can _feel_ the difference, but would also like to know _why_ it
>is different.
you're using a joystick, you're probably going to want it so that the
steering feels a little more 'digital', where you don't have to push the
stick to whole way to one side to get the steering to reach its full lock.
If however you're using a steering wheel to control it, like I do, you're
most likely going to want the least linear steering as possible, so that the
wheels on the car only turn as much as you turn the wheel, just like in a
real car.
I hope this helps, if not, let me know and I will go into greater detail.
:-)
Adam