u3d按住鼠标右键才转动摄像机的方法

unity3d获取鼠标3个键的响应如下：
鼠标左键GetMouseButton(0)
鼠标右键GetMouseButton(1)
鼠标中键GetMouseButton(2)

知道了鼠标的响应要做到按下右键再转动摄像机就简单了。
建好一工程UNITY自带的脚本MouseLook.cs中已经把通过鼠标移动旋转摄像机的功能做好了。想要按下右键才再转动摄像机。只要在Update()的相应位置加上Input.GetMouseButton(1)就可以了。
代码如下：

void Update ()
 {
  if(Input.GetMouseButton(1))
  {
   if (axes == RotationAxes.MouseXAndY)
   {
    // Read the mouse input axis
    rotationX += Input.GetAxis("Mouse X") * sensitivityX;
    rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
    rotationX = ClampAngle (rotationX, minimumX, maximumX);
    rotationY = ClampAngle (rotationY, minimumY, maximumY);
    
    Quaternion xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
    Quaternion yQuaternion = Quaternion.AngleAxis (rotationY, Vector3.left);
    
    transform.localRotation = originalRotation * xQuaternion * yQuaternion;
   }
   else if (axes == RotationAxes.MouseX)
   {
    rotationX += Input.GetAxis("Mouse X") * sensitivityX;
    rotationX = ClampAngle (rotationX, minimumX, maximumX);
    Quaternion xQuaternion = Quaternion.AngleAxis (rotationX, Vector3.up);
    transform.localRotation = originalRotation * xQuaternion;
   }
   else
   {
    rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
    rotationY = ClampAngle (rotationY, minimumY, maximumY);
    Quaternion yQuaternion = Quaternion.AngleAxis (rotationY, Vector3.left);
    transform.localRotation = originalRotation * yQuaternion;
   }
  }
 }