Unity (七) 摄像机跟随：实现角色被障碍物挡住后，摄像机滑到正好能看到主角的位置

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CameroFollow : MonoBehaviour {
    //观察目标
    public Transform  followtarget;
    //观察向量
    private Vector3 followDir;
    //观察偏移量
    public float watchoffet = 1.5f;
    //可选观察点的个数
    public int gears = 5;
    //射线碰撞检测器
    private RaycastHit hit;
    //摄像机移动的速度
    public float moveSpeed = 3f;
    //摄像机旋转的速度
    public float turnSpeed = 10f;
void Start () {
       followtarget = GameObject.FindGameObjectWithTag(Tags.Player).transform;//指定跟随的目标是标签为Player的
        followDir = followtarget.position - transform.position;
    }
void Update () {
        //观察点队列的起点
        Vector3 startPos =followtarget.position- followDir ;
        //观察点队列的终点
        Vector3 endPos = followtarget.position + followtarget.up*(startPos.y+watchoffet);
        //创建观察队列
        Vector3[] points = new Vector3[gears];
        //设置起始点
        points[0] = startPos;
        //设置终点
        points[points.Length - 1] = endPos;
        //设置中间点
        for (int i = 1; i < points.Length-1; i++)
        {
            points[i] = Vector3.Lerp(startPos, endPos,  (float) i / (points.Length - 1));

        }
        //观察点结果（初始为起点坐标）
        Vector3 resultwatchPoint = startPos;
        for (int j = 0; j <points.Length; j++)
        {
            if (CanWatchTarget(points[j]))
            {
                resultwatchPoint = points[j];
                break;
            }
        }
        //lerp到目标位置
        transform.position = Vector3.Lerp(transform.position, resultwatchPoint, Time.deltaTime * moveSpeed);
        
        //获取方向
        Vector3 dir = followtarget.position - transform.position;
        //转四元数
        Quaternion targetQua = Quaternion.LookRotation(dir);
        //lerp到目标旋转
        transform.rotation=Quaternion.Lerp(transform.rotation,targetQua,Time.deltaTime*turnSpeed);
        //旋转修正
        transform.eulerAngles = new Vector3(transform.eulerAngles.x, 0, 0);
    }
    /// <summary>
    /// 能否看到目标
    /// </summary>
    /// <param name="pos">传入的点</param>
    /// <returns>能看到或者不能看到</returns>
    bool CanWatchTarget( Vector3 pos)
    {              
         //发射射线
        if (Physics.Raycast(pos,followtarget.position-pos,out hit))
        {
            //射线碰撞到玩家
            if (hit.collider.CompareTag(Tags.Player))
            {
                return true;
            }
           
        }
        return false;
    }
}