Unity3D实现鼠标控制视角转动

using System.Collections;
using System.Collections.Generic;
using UnityEngine;


public class MouseView : MonoBehaviour {

 public enum RotationAxes
 {
 MouseXAndY = 0,
 MouseX = 1,
 MouseY = 2
 }

 public RotationAxes m_axes = RotationAxes.MouseXAndY;
 public float m_sensitivityX = 10f;
 public float m_sensitivityY = 10f;

 // 水平方向的 镜头转向
 public float m_minimumX = -360f;
 public float m_maximumX = 360f;
 // 垂直方向的 镜头转向 (这里给个限度 最大仰角为45°)
 public float m_minimumY = -45f;
 public float m_maximumY = 45f;

 float m_rotationY = 0f;


 // Use this for initialization
 void Start () {
 // 防止 刚体影响 镜头旋转
 if (GetComponent<Rigidbody>()) {
  GetComponent<Rigidbody> ().freezeRotation = true;
 }
 }

 // Update is called once per frame
 void Update () {
 if (m_axes == RotationAxes.MouseXAndY) {
  float m_rotationX = transform.localEulerAngles.y + Input.GetAxis ("Mouse X") * m_sensitivityX;
  m_rotationY += Input.GetAxis ("Mouse Y") * m_sensitivityY;
  m_rotationY = Mathf.Clamp (m_rotationY, m_minimumY, m_maximumY);

  transform.localEulerAngles = new Vector3 (-m_rotationY, m_rotationX, 0);
 } else if (m_axes == RotationAxes.MouseX) {
  transform.Rotate (0, Input.GetAxis ("Mouse X") * m_sensitivityX, 0);
 } else {
  m_rotationY += Input.GetAxis ("Mouse Y") * m_sensitivityY;
  m_rotationY = Mathf.Clamp (m_rotationY, m_minimumY, m_maximumY);

  transform.localEulerAngles = new Vector3 (-m_rotationY, transform.localEulerAngles.y, 0);
 }
 }
}