Unity 常用的几种相机跟随

固定相机跟随

这种相机有一个参考对象，它会保持与该参考对象固定的位置，跟随改参考对象发生移动

using UnityEngine;using System.Collections;public class CameraFlow : MonoBehaviour{    public Transform target;    private Vector3 offset;    // Use this for initialization    void Start()    {        offset = target.position - this.transform.position;    }    // Update is called once per frame    void Update()    {        this.transform.position = target.position - offset;    }}
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固定相机跟随，带有角度旋转

这一种相机跟随是对第一种相机跟随的改进，在原有基础上面，添加了跟随角度的控制

using UnityEngine;using System.Collections;public class CameriaTrack : MonoBehaviour {    private Vector3 offset = new Vector3(0,5,4);//相机相对于玩家的位置    private Transform target;    private Vector3 pos;    public float speed = 2;    // Use this for initialization    void Start () {        target = GameObject.FindGameObjectWithTag("Player").transform;    }    // Update is called once per frame    void Update () {        pos = target.position + offset;        this.transform.position = Vector3.Lerp(this.transform.position, pos, speed*Time.deltaTime);//调整相机与玩家之间的距离        Quaternion angel = Quaternion.LookRotation(target.position - this.transform.position);//获取旋转角度        this.transform.rotation = Quaternion.Slerp(this.transform.rotation, angel, speed * Time.deltaTime);    }}
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第三人称相机

这种相机跟随，是第三人称角度看向对象的，也就是一直看向对象的后面，如一直显示玩家的后背

using UnityEngine;using System.Collections;//相机一直拍摄主角的后背public class CameraFlow : MonoBehaviour {    public Transform target;    public float distanceUp=15f;    public float distanceAway = 10f;    public float smooth = 2f;//位置平滑移动值    public float camDepthSmooth = 5f;    // Use this for initialization    void Start () {    }    // Update is called once per frame    void Update () {       // 鼠标轴控制相机的远近        if ((Input.mouseScrollDelta.y < 0 && Camera.main.fieldOfView >= 3) || Input.mouseScrollDelta.y > 0 && Camera.main.fieldOfView <= 80)        {            Camera.main.fieldOfView += Input.mouseScrollDelta.y * camDepthSmooth * Time.deltaTime;        }    }    void LateUpdate()    {       //相机的位置        Vector3 disPos = target.position + Vector3.up * distanceUp - target.forward * distanceAway;        transform.position=Vector3.Lerp(transform.position,disPos,Time.deltaTime*smooth);        //相机的角度        transform.LookAt(target.position);    }}
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相机跟随，鼠标控制移动和缩放

相机与观察对象保持一定距离，可以通过鼠标进行上下左右旋转，通过鼠标滚轮进行放大和缩小操作

using UnityEngine;using System.Collections;public class CameraFlow : MonoBehaviour{    public Transform target;    Vector3 offset;    // Use this for initialization    void Start()    {        offset = transform.position - target.position;    }    // Update is called once per frame    void Update()    {        transform.position = target.position + offset;        Rotate();        Scale();    }    //缩放    private void Scale()    {        float dis = offset.magnitude;        dis += Input.GetAxis("Mouse ScrollWheel") * 5;        Debug.Log("dis=" + dis);        if (dis < 10 || dis > 40)        {            return;        }        offset = offset.normalized * dis;    }    //左右上下移动    private void Rotate()    {        if (Input.GetMouseButton(1))        {            Vector3 pos = transform.position;            Vector3 rot = transform.eulerAngles;            //围绕原点旋转，也可以将Vector3.zero改为 target.position,就是围绕观察对象旋转            transform.RotateAround(Vector3.zero, Vector3.up, Input.GetAxis("Mouse X") * 10);            transform.RotateAround(Vector3.zero, Vector3.left, Input.GetAxis("Mouse Y") * 10);            float x = transform.eulerAngles.x;            float y = transform.eulerAngles.y;            Debug.Log("x=" + x);            Debug.Log("y=" + y);            //控制移动范围            if (x < 20 || x > 45 || y < 0 || y > 40)            {                transform.position = pos;                transform.eulerAngles = rot;            }            //  更新相对差值            offset = transform.position - target.position;        }    }}