鼠标左键旋转视角，滚轮缩放视角

usingUnityEngine;

usingSystem.Collections;

public class TXCameraFollowPlayer : MonoBehaviour {

public Transform player;//需要旋转的模型

private Vector3 offset;//偏移量

private float speed=5f;//缩放视角  速度

private bool isRotate=false;//是否正在按下右键

private float rotateSpeed=3;//旋转速度

private float distance = 0;

// Use this for initialization

void Start () {

offset = transform.position - player.position;

}

// Update is called once per frame

void Update () {

transform.position = offset + player.position;

RotateView ();

ScrollView ();

}

void ScrollView(){

//根据offset用magnitude可以求出两点之间的距离

distance = offset.magnitude;

distance += Input.GetAxis ("Mouse ScrollWheel")*speed;

//将distance控制在2,18之间

distance = Mathf.Clamp (distance,0.1f,18);

//normalized是向量

offset = offset.normalized * distance;

}

void RotateView(){

if(Input.GetMouseButtonDown (1)) {

isRotate=true;

}

if(Input.GetMouseButtonUp (1)) {

isRotate=false;

}

if (isRotate) {

//Vector3 origiPos=transform.position;

//Quaternion origiRotation=transform.rotation;

transform.RotateAround(player.position,player.up,Input.GetAxis("Mouse X")*rotateSpeed);

transform.RotateAround(player.position,transform.right,-Input.GetAxis("Mouse Y")*rotateSpeed);

//          float x=transform.eulerAngles.x;

//          if(x<10||x>80){

//              transform.position=origiPos;

//              transform.rotation=origiRotation;

//          }

}

offset = transform.position - player.position;

}

}