unity3d 第一人称脚本解释MouseLook

 using UnityEngine;
 using System.Collections;

 /// MouseLook rotates the transform based on the mouse delta.
 /// Minimum and Maximum values can be used to constrain the possible rotation

 /// To make an FPS style character:
 /// - Create a capsule.
 /// - Add the MouseLook script to the capsule.
 ///   -> Set the mouse look to use LookX. (You want to only turn character but not tilt it)
 /// - Add FPSInputController script to the capsule
 ///   -> A CharacterMotor and a CharacterController component will be automatically added.

 /// - Create a camera. Make the camera a child of the capsule. Reset it's transform.
 /// - Add a MouseLook script to the camera.
 ///   -> Set the mouse look to use LookY. (You want the camera to tilt up and down like a head. The character already turns.)
 [AddComponentMenu("Camera-Control/Mouse Look")]
 public class MouseLook : MonoBehaviour {
     //3个枚举
     // 这个表示当前控制模式，分别是
     // MouseXAndY上下左右旋转
     // MouseX只能左右旋转
     // MouseY只能上下旋转
     public enum RotationAxes { MouseXAndY = , MouseX = , MouseY =  }
     public RotationAxes axes = RotationAxes.MouseXAndY;

     // 这俩是左右上下旋转时候的灵敏度
     public float sensitivityX = 15F;
     public float sensitivityY = 15F;

     // 左右旋转的最大角度
     public float minimumX = -360F;
     public float maximumX = 360F;

     //上下旋转最大角度
     public float minimumY = -60F;
     public float maximumY = 60F;

     float rotationY = 0F;

     void Update ()
     {
         //如果是上下左右旋转的模式
         if (axes == RotationAxes.MouseXAndY)
         {
             // 根据鼠标X轴计算摄像机 Y轴旋转角度
             float rotationX = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * sensitivityX;

             // 根据鼠标Y轴计算摄像机x轴旋转角度
             rotationY += Input.GetAxis("Mouse Y") * sensitivityY;

             // 检查上下旋转角度不超过 minimumY和maximumY
             rotationY = Mathf.Clamp (rotationY, minimumY, maximumY);

             // 设置摄像机旋转角度
             transform.localEulerAngles = new Vector3(-rotationY, rotationX, );
         }
         else if (axes == RotationAxes.MouseX)//如果只是左右旋转
         {
             transform.Rotate(, Input.GetAxis("Mouse X") * sensitivityX, );
         }
         else//如果只是上下旋转
         {
             rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
             rotationY = Mathf.Clamp (rotationY, minimumY, maximumY);

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

     void Start ()
     {
         // 冻结刚体的旋转功能
         // Make the rigid body not change rotation
         if (GetComponent<Rigidbody>())
             GetComponent<Rigidbody>().freezeRotation = true;
     }
 }