public class MainCamera : MonoBehaviour
    {
        public Transform Target;

        // Use this for initialization
        void Start()
        {
            Debug.Log(Vector3.Distance(Target.position, transform.position));
        }

        // Update is called once per frame
        void Update()
        {
            transform.LookAt(Target);
            Debug.Log(Vector3.Distance(Target.position, transform.position));
        }
    }