@ don pedro
I tested you original camera function. I found it very nice the way it was first proposed.
there is not need to do anything to it. In fact what I proposed is totally incorrect.

this is the function I tested
Code:

---

  
starter move_camera()
{
   camera.arc=72;
   camera.clip_near=20;
   camera.clip_far=24000;

   var cam_ang[3];
   var cam_dist=500;
   cam_ang.pan=180;
   cam_ang.tilt=30;
   cam_ang.roll=0;
   while(!p_vehicle){wait(1);}

   while(1)
   {
     camera.x = p_vehicle.x - 350 * cos(p_vehicle.pan); 
     camera.y = p_vehicle.y - 350 * sin(p_vehicle.pan); 
     camera.z = p_vehicle.z + 100; 
     camera.pan = p_vehicle.pan; 
     camera.tilt = -10; 
     wait(1);
   }
}

---

Newton