摄像机的跟随

如何实现摄像机跟随
比如摄像机的位置 (0,0,5)
玩家位置为(0,0,2)
一开始先计算摄像机和玩家的位置 是多少首先
摄像机的位置 – 玩家的位置 等于 偏移量(0,0,3)
然后 偏移量 + 玩家的位置 赋值给摄像机就等于 玩家和摄像机之间固定距离是多少
摄像机跟随 建议放在LateUpdate 生命周期中 因为这个生命周期适合做跟随效果

//start中进行初始偏移
  offersPosition = transform.position - target.transform.position;
  //变换后的偏移
   offersPosition =nowPosition - target.transform.position;
   //之后
   放入LateUpdate进行更新摄像机位置
    transform.position = offersPosition + target.transform.position;
   

但是有时候，相机在旋转过程中，会出现相机的下坠或者位置不符合
同样我这里出现了这情况
解决方案：
我通过计算摄像机和人物之间的距离，使其始终保持一定的距离

//start
   var qua = Quaternion.LookRotation(target.transform.position - transform.position);
        var euler = qua.eulerAngles;
        euler.x = 0;
        euler.z = 0;
        euler.y = nowPosition.y;
        qua = Quaternion.Euler(euler);
        transform.rotation = Quaternion.Lerp(transform.rotation, qua, 0.5f);
        //transform.LookAt(target.transform.position);

        offersPosition = transform.position - target.transform.position;
        //求摄像机和目标点之间的距离
        targetDistance = currentDistance = Vector3.Distance(target.transform.position, transform.position);


//变化中写
 currentDistance = Mathf.Lerp(currentDistance, targetDistance, zoomDamp);
///LateUpdate
  transform.position = target.transform.position - transform.forward * currentDistance+new Vector3(0,2,0);

现在展示全部代码，这里我用了easytouch5插件，进行触摸滑动屏幕，改变旋转

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using HedgehogTeam.EasyTouch;
public class CameraController : MonoBehaviour
{
    /// <summary>
    /// 目标
    /// </summary>
    public GameObject target;

    private Vector3 nowPosition;

    private Vector3 offersPosition;

    public Vector3 targetEndPosition;

    /// <summary>
    /// 当前距离
    /// </summary>
    protected float currentDistance;
    /// <summary>
    /// 目标距离
    /// </summary>
    protected float targetDistance;
    Vector3 targetOffset;
    [Range(0, 3)]
    public float zoomDamp = 3;
    private float ratateSpeed = 5.0f;
    private void Start()
    {
        target = GameObject.FindGameObjectWithTag("Player");
        nowPosition = transform.position;
        targetEndPosition = target.transform.position;
        var qua = Quaternion.LookRotation(target.transform.position - transform.position);
        var euler = qua.eulerAngles;
        euler.x = 0;
        euler.z = 0;
        euler.y = nowPosition.y;
        qua = Quaternion.Euler(euler);
        transform.rotation = Quaternion.Lerp(transform.rotation, qua, 0.5f);
        //transform.LookAt(target.transform.position);

        offersPosition = transform.position - target.transform.position;
        //求摄像机和目标点之间的距离
        targetDistance = currentDistance = Vector3.Distance(target.transform.position, transform.position);
    
}
    private void Update()
    {
        Gesture gesture = EasyTouch.current;
        Vector2 gestureStartPos = gesture.startPosition;

        Vector2 gestureEndPos = gesture.position;
       
        if (gesture != null&&gesture.position.x>Screen.width/2)
        {
            Debug.Log("ges" + gesture.position.x + "pinmu" + Screen.width / 2);
            if (gesture.swipe == EasyTouch.SwipeDirection.Right || gesture.swipe == EasyTouch.SwipeDirection.Left)
            {
                Debug.Log("000");
                OnSwipeRight(gesture);
            }
        }
    }
    Quaternion qua;
    private void LateUpdate()
    {
        //   transform.position = offersPosition + target.transform.position;
        transform.position = target.transform.position - transform.forward * currentDistance+new Vector3(0,2,0);
    }

    private void OnSwipeRight(Gesture gesture)
    {
        int nun = 1;
        if (gesture.swipe == EasyTouch.SwipeDirection.Right)
        {
            nun = 1;
        }
        if (gesture.swipe == EasyTouch.SwipeDirection.Left)
        {
            nun = -1;
        }

      
        transform.RotateAround(target.transform.position, target.transform.up, gesture.position.x * nun * Time.deltaTime);
        
        target.transform.RotateAround(target.transform.position, target.transform.up, gesture.position.x * nun * Time.deltaTime);
        //nowPosition.x = transform.position.x;
        //nowPosition.z = transform.position.z;
        //offersPosition =nowPosition - target.transform.position;
        currentDistance = Mathf.Lerp(currentDistance, targetDistance, zoomDamp);

    }


}