unity3d 控制摄像头控制

一个控制摄像头移动的脚本，直接绑定到摄像机就可以使用.功能描述如下：

1.鼠标左键拖动观察

2.鼠标右键定点旋转

3.鼠标滚轴放大缩小

4.鼠标左键快速双击进行定点放大

#pragma strict
/***
**摄影机控制
*@author felly
*/

private var rayRotate :Ray = Ray(Vector3.zero, Vector3(0,1,0));
private var rayTranslate :Ray = Ray(Vector3.zero, Vector3(0,1,0));
private var hitInfo : RaycastHit ;

private var preTime :float = 0.0;


//它标记是否能旋转
private var flag :boolean = false ;

function Update () {///事件监视

     var direction :Vector3 = Vector3.zero;
     var px:float ;
     var pz:float ;
     
     
     if(Input.GetMouseButtonDown(0)){
         rayTranslate = camera.ScreenPointToRay(Input.mousePosition);
        //以摄像机为起点画射线，射线去地板碰撞点就是那个焦点
        Physics.Raycast(camera.transform.position, rayTranslate.direction, hitInfo);
        if (Time.time - preTime  < 0.3f ){
          hitInfo.point=hitInfo.point+Vector3(0,5,0);
          transform.position=Vector3.MoveTowards(camera.transform.position,hitInfo.point,10.0);
        }
         
         preTime = Time.time ;
     }
     
     //上下左右拖动
    if(Input.GetMouseButton(0)){
        px = Input.GetAxis("Mouse X") ;
        pz = Input.GetAxis("Mouse Y") ;
        direction = Vector3(px, pz, pz);
        transform.Translate( -1 * direction * 30 * Time.deltaTime);
    }
    
    //滚轴放到缩小
    pz = Input.GetAxis("Mouse ScrollWheel");
    direction = Vector3(0, 0, pz);
    transform.Translate(direction * 100 * Time.deltaTime);
    
    //旋转
    if(Input.GetMouseButtonDown(1)){
        rayRotate = camera.ScreenPointToRay(Input.mousePosition);
        flag = true ;
    }
    if(Input.GetMouseButtonUp(1)){
        rayRotate = Ray(Vector3.zero, Vector3(0,1,0));
        flag = false ;
    }
    if(Input.GetMouseButton(1) && flag){
        Physics.Raycast(camera.transform.position, rayRotate.direction, hitInfo);
        px = Input.GetAxis("Mouse X") ;
        transform.RotateAround(hitInfo.point, Vector3.up, 100 * px * Time.deltaTime);
    }
}