Unity相机视野的缩放,旋转及跟随

首先声明，博主使用的是Unity5.3.2(64)

游戏开发中，经常会遇到相机视野的拉近，拉远以及旋转,跟随的问题，这里我们只搞一种方式

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直接上代码：

using UnityEngine;using System.Collections;public class FollowPlayer : MonoBehaviour {    public float scrollSpeed = 1;//相机视野缩放系数    public float distance;//相机到目标的距离    public float rotateSpeed = 2;//相机视野旋转系数    private Transform player;//跟随的目标    private Vector3 offsetPosition;//位置偏移    private bool isRotating = false;//用来判断是否正在旋转    // Use this for initialization    void Start () {        player = GameObject.FindGameObjectWithTag ("Player").transform;//获取跟随目标        transform.LookAt (player.position);//使相机朝向目标        offsetPosition = transform.position - player.position;//获得相机与目标的位置的偏移量    }    // Update is called once per frame    void Update () {        transform.position = offsetPosition + player.position;//实现相机跟随        //处理视野的旋转        RotateView();        //处理视野的拉近拉远效果        ScrollView();    }    void ScrollView(){        distance = offsetPosition.magnitude;//得到偏移向量的长度        distance += Input.GetAxis ("Mouse ScrollWheel")*scrollSpeed;//获取鼠标中键*相机视野缩放系数        distance = Mathf.Clamp (distance,2.5f,15);//限定距离最小及最大值        offsetPosition = offsetPosition.normalized * distance;//更新位置偏移    }    void RotateView(){//      Input.GetAxis ("Mouse X");//得到鼠标在水平方向的滑动//      Input.GetAxis ("Mouse Y");//得到鼠标在垂直方向的滑动        if (Input.GetMouseButtonDown (1)) {            isRotating = true;        }        if (Input.GetMouseButtonUp (1)) {            isRotating = false;        }        if (isRotating) {            Vector3 originalPos = transform.position;//保存相机当前的位置            Quaternion originalRotation = transform.rotation;//保存相机当前的旋转            transform.RotateAround (player.position,player.up,rotateSpeed*Input.GetAxis ("Mouse X"));//沿目标y轴在水平方向旋转            transform.RotateAround (player.position,transform.right,-rotateSpeed*Input.GetAxis ("Mouse Y"));//沿自身x轴在竖直方向旋转            float x = transform.eulerAngles.x;//获得x轴的角度            if (x < 10 || x > 80) {//限制x轴的旋转在10到80之间                transform.position = originalPos;                transform.rotation = originalRotation;            }        }        offsetPosition = transform.position - player.position;//更新位置偏移量    }}