private void Awake()
{
// Set up the reference.
ball = GetComponent<Ball> ();
// get the transform of the main camera
if (Camera.main != null) {
cam = Camera.main.transform;
} else {
Debug.LogWarning (
"Warning: no main camera found. Ball needs a Camera tagged \"MainCamera\", for camera-relative controls.");
// we use world-relative controls in this case, which may not be what the user wants, but hey, we warned them!
}
}
