1、安装

window->package manager

2、创建Cinemachine

右键->Cinemachine->2D Carmera

3、创建空对象和多边形控制器如图

记得勾选 is Trigger

空对象位置记得要和小鸟保持一致，不然等下写完脚本后，镜头一开始会移动一下

4、将多边形触发器拖拽到2d Camera中，如图

5、给多边形触发器写个脚本随着小鸟镜头移动，不然小鸟会被挤出镜头

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

public class NewBehaviourScript : MonoBehaviour
{
    private GameObject player;

    // Start is called before the first frame update
    void Start()
    {
        player = GameObject.Find("player");
    }

    // Update is called once per frame
    void Update()
    {
        //水平跟随玩家
        transform.position = new Vector3(player.transform.position.x, transform.position.y, transform.position.z);
    }
}

把脚本拖拽给多边形触发器