private void BuildCar()
{
JitterDemo demo = this.Game as JitterDemo;
World world = demo.World;
CompoundShape.TransformedShape lower = new CompoundShape.TransformedShape(
new BoxShape(2.5f, 1f, 6.0f), JMatrix.Identity, JVector.Zero);
CompoundShape.TransformedShape upper = new CompoundShape.TransformedShape(
new BoxShape(2.0f, 0.5f, 3.0f), JMatrix.Identity, JVector.Up * 0.75f + JVector.Backward * 1.0f);
CompoundShape.TransformedShape[] subShapes = { lower, upper };
Shape chassis = new CompoundShape(subShapes);
//chassis = new BoxShape(2.5f, 1f, 6.0f);
carBody = new DefaultCar(world, chassis);
// use the inertia of the lower box.
// adjust some driving values
carBody.SteerAngle = 30; carBody.DriveTorque = 155;
carBody.AccelerationRate = 10;
carBody.SteerRate = 2f;
carBody.AdjustWheelValues();
carBody.Tag = BodyTag.DontDrawMe;
carBody.AllowDeactivation = false;
// place the car two units above the ground.
carBody.Position = new JVector(0, 5, 0);
world.AddBody(carBody);
}