// fuelCellGlowLookAt: Forces the object to always face the camera.
  // (Used for the 'glowing halo' effect behind the collectable items.)
  
  function Update() 
  {
          transform.LookAt(Camera.main.transform);
  }
  
  function OnBecameVisible()
  {
          enabled = true;        
  }
  
  function OnBecameInvisible()
  {
          enabled = false;        
  }