解决摄像机被遮挡问题

效果图：

代码：

using UnityEngine;  
using System.Collections;  
  
public class CameraMOve : MonoBehaviour {

    /// <summary>
    /// 移动速度
    /// </summary>
    public float moveSpeed = 3f;
    /// <summary>
    /// 放置速度
    /// </summary>
    public float turnSpeed = 10f;
    /// <summary>
    /// 玩家
    /// </summary>
    private Transform player;
    /// <summary>
    /// 摄像机鱼玩家之间的向量
    /// </summary>
    private Vector3 direction;

    /// <summary>
    /// 射线碰撞
    /// </summary>
    private RaycastHit hit;
    /// <summary>
    /// 摄像机与玩家之间的距离
    /// </summary>
    private float distance;
    /// <summary>
    /// 摄像机的观测点
    /// </summary>
    private Vector3[] currentPoints;


    
    void Start () {
        player = GameObject.FindWithTag(Tags.Player).transform;
        currentPoints = new Vector3[5];
        distance = Vector3.Distance(transform.position, player.position );
        //从摄像机指向玩家的偏移量
        direction= player.position - transform.position;

       
    }  
      
      /// <summary>
      /// 摄像机代码放到LateUpdate中
      /// 物理操作代码放到FixedUpdate
      /// </summary>
    void LateUpdate () {
        //Player与摄像机之间的距离
        Vector3 startPoint = player.position - direction ;
        //Player垂直上方 与摄像机同高的点
        Vector3 endPoint = player.position + Vector3.up * distance;
        //循环获取 摄像机到Player上方 点之间的5个点
        for (int i = 0; i < currentPoints.Length ; i++)
        {
            currentPoints[i] = Vector3.Lerp(startPoint, endPoint, i * 0.25f);
        }
        
        //取数组中的一个值为默认位置
        Vector3 viewPosition= currentPoints[0];

        //循环调用射线检测 找到能看到Player的点
        for (int i=0;i<currentPoints.Length; i++)
        {
            if (CheckView (currentPoints[i]))
            {
                viewPosition = currentPoints[i];
                break;
            }
        }

        //刷新位置
        transform.position = Vector3.Lerp(transform.position, viewPosition, Time.deltaTime * moveSpeed);
        //调整角度
        SmoothRotate();
    }
    /// <summary>
    /// 检测能否看到玩家
    /// </summary>
    /// <param name="pos"></param>
    /// <returns></returns>
    bool CheckView(Vector3 pos) {
        //获取点到摄像机的位置
        Vector3 dir = player.position - pos;
        //发射射线
        if(Physics .Raycast (pos ,dir ,out hit))
        {
            if(hit .collider .tag ==Tags .Player)
            {
                return true;
            }
        }
        return false;
    }

    /// <summary>
    /// 调整摄像机旋转角度
    /// </summary>
    void SmoothRotate()
    {
        //获取摄像机到Player的向量
        Vector3 dir = player.position - transform.position;
        //返回一个角度 这个角度就是朝向Player的夹角
        Quaternion qua = Quaternion.LookRotation(dir );
        //旋转角度
        transform.rotation = Quaternion.Lerp(transform.rotation, qua, Time.deltaTime * turnSpeed);
        //锁定yz轴 
        transform.eulerAngles = new Vector3(transform.eulerAngles.x, 0, 0);
    }    
}