摄像机的控制

using UnityEngine;
using System.Collections;
[AddComponentMenu("Camera-Control/3dsMax Camera Style")]
public class MaxCamera : MonoBehaviour
{
    public Transform target;
    public Vector3 targetOffset;
    public float distance = 5.0f;
    public float maxDistance = 20;
    public float minDistance = .6f;
    public float xSpeed = 200.0f;
    public float ySpeed = 200.0f;
    public int yMinLimit = -80;
    public int yMaxLimit = 80;
    public int zoomRate = 40;
    public float panSpeed = 0.3f;
    public float zoomDampening = 5.0f;
    private float xDeg = 0.0f;
    private float yDeg = 0.0f;
    private float currentDistance;
    private float desiredDistance;
    private Quaternion currentRotation;
    private Quaternion desiredRotation;
    private Quaternion rotation;
    private Vector3 position;
    //bool isshang;
    //bool isxia;
    //bool iszuo;
    //bool isyou;
    //public bool ispingyi;

    void Start() { Init(); }
    void OnEnable() { Init(); }
    public void Init()
    {
        //If there is no target, create a temporary target at 'distance' from the cameras current viewpoint
        if (!target)
        {
            GameObject go = new GameObject("Cam Target");
            go.transform.position = transform.position + (transform.forward * distance);
            target = go.transform;
        }
        distance = Vector3.Distance(transform.position, target.position);
        currentDistance = distance;
        desiredDistance = distance;
                
        //be sure to grab the current rotations as starting points.
        position = transform.position;
        rotation = transform.rotation;
        currentRotation = transform.rotation;
        desiredRotation = transform.rotation;
        
        xDeg = Vector3.Angle(Vector3.right, transform.right );
        yDeg = Vector3.Angle(Vector3.up, transform.up );
    }
    
    void LateUpdate()
    {
        // If Control and Alt and Middle button? ZOOM!
        if (Input.GetMouseButton(2)/* && Input.GetKey(KeyCode.LeftAlt) && Input.GetKey(KeyCode.LeftControl)*/)
        {
            desiredDistance -= Input.GetAxis("Mouse Y") * Time.deltaTime * zoomRate*0.125f * Mathf.Abs(desiredDistance);
        }
        // If middle mouse and left alt are selected? ORBIT
        else if (Input.GetMouseButton(0) /*&& Input.GetKey(KeyCode.LeftAlt)*/)
        {
            xDeg += Input.GetAxis("Mouse X") * xSpeed * 0.01f;
            yDeg -= Input.GetAxis("Mouse Y") * ySpeed * 0.01f;
            ////////OrbitAngle
            //Clamp the vertical axis for the orbit
            yDeg = ClampAngle(yDeg, yMinLimit, yMaxLimit);
            // set camera rotation 
            desiredRotation = Quaternion.Euler(yDeg, xDeg, 0);
            currentRotation = transform.rotation;
            
            rotation = Quaternion.Lerp(currentRotation, desiredRotation, Time.deltaTime * zoomDampening);
            transform.rotation = rotation;
           // ispingyi = true;
        }
        if (Input.GetMouseButtonUp(0))
        {
          //  ispingyi = false;
        }
        // otherwise if middle mouse is selected, we pan by way of transforming the target in screenspace
        //else if (Input.GetMouseButton(0))
        //{
        //    //grab the rotation of the camera so we can move in a psuedo local XY space
        //    target.rotation = transform.rotation;
        //    target.Translate(Vector3.right * -Input.GetAxis("Mouse X") * panSpeed);
        //    target.Translate(transform.up * -Input.GetAxis("Mouse Y") * panSpeed, Space.World);
        //}
        ////////Orbit Position
        // affect the desired Zoom distance if we roll the scrollwheel
        desiredDistance -= Input.GetAxis("Mouse ScrollWheel") * Time.deltaTime * zoomRate * Mathf.Abs(desiredDistance);
        //clamp the zoom min/max
        desiredDistance = Mathf.Clamp(desiredDistance, minDistance, maxDistance);
        // For smoothing of the zoom, lerp distance
        currentDistance = Mathf.Lerp(currentDistance, desiredDistance, Time.deltaTime * zoomDampening);
        // calculate position based on the new currentDistance 
        
         position = target.position - (rotation * Vector3.forward * currentDistance + targetOffset);
         transform.position = position;
         
 
       
        //if (isshang == true)
        //{
        //    target.Translate(transform.up * panSpeed, Space.World);
        //}
        //if (isxia == true)
        //{
        //    target.Translate(transform.up * -panSpeed, Space.World);
        //}
        //if (iszuo == true)
        //{
        //   target.transform.Translate(Vector3.right * -panSpeed);

        //}
        //if (isyou == true)
        //{
        //    target.Translate(Vector3.right * panSpeed);
        //}
    }

    //void shang()
    //{   
    //    isshang = true;
    //}
    //void bushang()
    //{
    //    isshang = false;
    //}
    //void xia()
    //{

    //    isxia = true;
    //}
    //void buxia()
    //{

    //    isxia = false;
    //}
    //void zuo()
    //{
    //    iszuo = true;
    //}
    //void buzuo()
    //{
    //    iszuo = false;
    //}
    //void you()
    //{
    //    isyou = true;
    //}
    //void buyou()
    //{
    //    isyou = false;
    //}

    private static float ClampAngle(float angle, float min, float max)
    {
        if (angle < -360)
            angle += 360;
        if (angle > 360)
            angle -= 360;
        return Mathf.Clamp(angle, min, max);
    }
}