using UnityEngine;

public class Test2 : MonoBehaviour {
    public Transform cube;//執行場景在Scene移動他就可以看到效果
    public Transform center;
    Vector3 chaoxiang;
    float initDistance;
	// Use this for initialization
	void Start () {
        initDistance = Vector3.Distance(cube.position, center.position);//獲得初始距離
	}
	
	// Update is called once per frame
	void Update () {
        
        center.LookAt(cube);//朝向cube
        transform.rotation = center.rotation;//保持旋轉值一致
        //是以中心點為中心，正前方的向量移動的
        transform.position=center.position+(transform.forward * (Vector3.Distance(cube.position, center.position) - initDistance)* 1f);
	}
}