Unity_简单的摄像机绕物体旋转

using UnityEngine;using System.Collections;public class cam : MonoBehaviour {    public Transform target;    public float distance = 8;    public float h;    public float v;    float speed = 200;    void Start ()    {        Fn();}void Update ()    {        if (Input.GetMouseButton(0))        {            h += Input.GetAxis("Mouse X") * speed * Time.deltaTime;            v -= Input.GetAxis("Mouse Y") * speed * Time.deltaTime;            v = Mathf.Clamp(v, 0, 80);            Fn();        }}    void Fn()    {        Quaternion q = Quaternion.Euler(v, h, 0);        transform.rotation = q;        Vector3 dir = q * new Vector3(0, 0, -distance);        transform.position = target.position + dir;    } }