Unity中攝像機繞物體旋轉和拉近拉遠視角的操作

Unity中攝像機的重要性毋庸置疑，關於攝像機的操作也有很多，比如第一人稱跟隨，第二人稱跟隨，攝像機的拉近拉遠等等，下面就暫時實現攝像機的拉近拉遠和旋轉：

創建新的場景，場景中添加一個cube，然后給cube添加新的腳本，腳本內容如下：

using UnityEngine;
using System.Collections;

public class TestCube : MonoBehaviour {
    private GameObject rotateObj;
    private GameObject camera;
    public float speed = 3f;

    private bool rotate = false;

    public float maxView = 90;
    public float minView = 10;
    void Start()
    {
        rotateObj = GameObject.Find("Rotate");
        camera = GameObject.Find("Main Camera");
    }
	void Update () {
        //滑動鼠標滑輪控制視角的大小
        float offsetView = Input.GetAxis("Mouse ScrollWheel") * speed;
        float tmpView = offsetView + Camera.main.fieldOfView;
        tmpView = Mathf.Clamp(tmpView, minView, maxView);
        Camera.main.fieldOfView = tmpView;

        //繞主角旋轉攝像機
        if(rotate)
        {
            camera.transform.RotateAround(transform.position, Vector3.up, speed * Input.GetAxis("Mouse X"));
        }
        if(Input.GetMouseButtonDown(0))
        {
            rotate = true;
        }
        if(Input.GetMouseButtonUp(0))
        {
            rotate = false;
        }
	}
}