CameraTest.cs

using UnityEngine;
using System.Collections;
 
public class CameraTest : MonoBehaviour
{
    //public Camera m_Camera;
 	void Start () {
		GameObject cam_H = GameObject.Find("Main Camera");

	}
    void Update()
    {
		GameObject cam_H = GameObject.Find("Main Camera");
        transform.LookAt(transform.position + cam_H.transform.rotation * Vector3.back, cam_H.transform.rotation * Vector3.up);
												//m_Camera.transform.rotation * Vector3.back, m_Camera.transform.rotation * Vector3.up);
    }
}