Unity 键盘鼠标操作控制物体

void Update()
    {
        //左Ctrl键
        if (Input.GetKey(KeyCode.LeftControl))
        {
            B_LeftCtrl = true;
        }
        else
        {
            B_LeftCtrl = false;
        }

        if (Input.GetMouseButton(0) && B_LeftCtrl)//鼠标左键+左Ctrl
        {
            float mouseX = Input.GetAxis("Mouse X");//获取鼠标X轴滑动参数
            float mouseY = Input.GetAxis("Mouse Y");//获取鼠标Y轴滑动参数
            //鼠标XY轴滑动控制物体旋转
            GameObject.Find("地形").transform.Rotate(new Vector3(mouseY * Time.deltaTime * rotateSpeed, -mouseX * Time.deltaTime * rotateSpeed));
        } 

        if (Input.GetMouseButton(1) && B_LeftCtrl)//鼠标右键+左Ctrl
        {  
            float mouseX = Input.GetAxis("Mouse X");//获取鼠标X轴滑动参数
            float mouseY = Input.GetAxis("Mouse Y");//获取鼠标Y轴滑动参数  
             
            GameObject.Find("地形").transform.Translate(new Vector3(mouseX * Time.deltaTime * moveSpeed,mouseY * Time.deltaTime * moveSpeed,0));
        }

        if (B_LeftCtrl)//左Ctrl键
        {
            //W、A、S、D 控制移动
            float horizontal = Input.GetAxis("Horizontal"); //获取横轴参数。 
            float vertical = Input.GetAxis("Vertical"); //获取垂直参数。  

            GameObject.Find("地形").transform.Translate(new Vector3(horizontal * Time.deltaTime * moveSpeed, 0, vertical * Time.deltaTime * moveSpeed));

            //鼠标中键控制物体滚轴缩放
            float mouseScrollWheel = Input.GetAxis("Mouse ScrollWheel");  
            GameObject.Find("地形").transform.localScale += new Vector3(mouseScrollWheel, mouseScrollWheel, mouseScrollWheel);
        }
    }