using UnityEngine;

 using System.Collections;

 public class CameraController : MonoBehaviour {

     public float near = 20.0f;

     public float far = 100.0f;

     public float sensitivityX = 10f;

     public float sensitivityY = 10f;

     public float sensitivetyZ = 2f;

     public float sensitivetyMove = 2f;

     public float sensitivetyMouseWheel = 2f;

     void Update () {

         // 滚轮实现镜头缩进和拉远

         if (Input.GetAxis("Mouse ScrollWheel") != )

         {

             this.camera.fieldOfView =this.camera.fieldOfView - Input.GetAxis("Mouse ScrollWheel")*sensitivetyMouseWheel;

             this.camera.fieldOfView = Mathf.Clamp(this.camera.fieldOfView, near, far);

         }

         //鼠标右键实现视角转动，类似第一人称视角

         if (Input.GetMouseButton())

         {

             float rotationX = Input.GetAxis("Mouse X") * sensitivityX;

             float rotationY = Input.GetAxis("Mouse Y") * sensitivityY;

             transform.Rotate(-rotationY, rotationX, );

         }

         //键盘按钮←和→实现视角水平旋转

         if (Input.GetAxis("Horizontal")!=)

         {

             float rotationZ=Input.GetAxis("Horizontal") * sensitivetyZ;

             transform.Rotate(, , rotationZ);

         }

     }

 }