Turning a car...

OpenGL
1

I need to think a way to do a car (actually a truck) to be driven. I need to find a way if I turn the wheels, the car must follow the path correctly. I’m struggling a lot to think in a way that I can do that properly, I googled but I can’t find anything. Someone can help me or even know a tutorial/example of how to do this? can be a simpler manner, I don’t need the Y coordinate (the car won’t fly), only Z and X.

Thanks.

2

This is more a math topic. Anyway.

Imagine the car has only one front-left weel and one rear-left wheel, it is easier.
At anytime, the rotation of the car will depend :

  • of the speed of the car,
  • along an arc,
  • which is defined by its center (virtual intersection of rear and front wheel axis) and its radius (distance from this intersection to the rear wheel).

This is secondary education trigonometrics.

3

Is this?

How can I find the intersection point mathematically?

4

I’m thinking in finding the point and translate it to the origin (0,0,0) and then, rotate the modelview matrix around Y axis, and then, translate it again to the original location. But I need to know constantly where is the intersection point.

To find the intersection point will be a [censored], how can I track the point with a function if the wheel axis is moving around?

It must be an easier way.

Well, I give up… :frowning:

5

Please, I implore, help me, I need to do that still this week. :frowning:

6

Dude, sorry to appear rude, but this is the wrong forum for such questions. Try gamedev.net or devmaster.net.

7

you may build two planes. The 1st with a normal that is the front wheel forward direction and a point that is the front wheel center. The 2nd with the rear wheel forward direction center.

Then it possible to find the planes intersection which is a line. With the line equation:

x = ay + b
z = cy + d
y = K (a constant)

you choose y value as the wheel height from the floor and you obtain x and z values at the intersection point.