Vehicle and camera angle in 3rd person view?

I'm playing with the starter.racing example and I'd like to prevent the camera from rotating to follow the angle of the vehicle's x axis when in 3rd person view. The way it is now, if you drive up a steep hill you're suddenly looking at the sky rather than the roof of the vehicle. Ideally I'd like the camera to just point down at the car at a fixed angle. I am guessing this could be done by modifying Vehicle::getCameraTransform in vehicle.cc, probably by changing this bit: (?)



I would like to turn when the car's front wheels can see it is side.

thank you for help me!!!

// Build a transform that points along the eye axis
// but where the Z axis is always up.
if (mDataBlock->cameraRoll)
mat->mul(eye,rot);
else {
MatrixF cam(1);
VectorF x,y,z(0,0,1);
eye.getColumn(1, &y);
mCross(y, z, &x);
x.normalize();
mCross(x, y, &z);
z.normalize();
cam.setColumn(0,x);
cam.setColumn(1,y);
cam.setColumn(2,z);
mat->mul(cam,rot);
}