项目需求：要近距离观察上图的圆柱
解决核心：把摄像机移动到，圆柱前方，离圆柱z坐标5个单位的地方。
参考代码：此处移动用的是DOTween插件的“DOLocalMove（目标位置，耗费时间）；”方法。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;


public class TestCameraMove : MonoBehaviour
{
    private Vector3 cameraOriginPos = new Vector3(0,1,-10);
    public Transform targetTra;
    //private Vector3 aimPos = targetGOPos - new Vector3();
    public bool flag;
    void Awake()
    {

    }

    void Start()
    {
        
    }

    void Update()
    {

    }
    public void MoveCamera()
    {
        Vector3 aimPos = targetTra.localPosition - new Vector3(0,0,5);
        if (!flag)
        {
            Camera.main.transform.DOLocalMove(aimPos,2);
            flag = true;
        }
        else
        {
            Camera.main.transform.DOLocalMove(cameraOriginPos,2);
            flag = false;
        }
    }
}

实现效果: