using UnityEngine;using System.Collections;public class CameraVirtual : MonoBehaviour{    //旋转的物体    public GameObject building;    //用来记录鼠标的位置，以便计算旋转幅度    Vector2 p1, p2;     // Update is called once per frame    void Update()    {        if (Input.GetMouseButtonDown(1))        {            p1 = new Vector2(Input.mousePosition.x, Input.mousePosition.y);//鼠标右键按下时记录鼠标位置p1        }        if (Input.GetMouseButton(1))        {            p2 = new Vector2(Input.mousePosition.x, Input.mousePosition.y);//鼠标右键拖动时记录鼠标位置p2            //下面开始旋转，仅在水平方向上进行旋转            float dx = p2.x - p1.x;            transform.RotateAround(building.transform.position, Vector3.up, dx * Time.deltaTime);        }    }}