Unity3d中使用鼠標控制物體的平移旋轉縮放

基本功能實現：物體通過鼠標左鍵上下移動，中間鍵縮放、右鍵旋轉，30秒沒操作，物體自動旋轉。
主要代碼如下：

public class Test : MonoBehaviour
{
    public Transform target;

    private int MouseWheelSensitivity = 50;
    private int MouseZoomMin = 20;
    private int MouseZoomMax = 112;
    private float normalDistance = 500;
    private bool flag_Roable = true;//自動旋轉標誌	
    private Vector3 normalized;
    private float xSpeed = 250.0f;
    private float ySpeed = 120.0f;
    private float x = 0.0f;
    private float y = 0.0f;
    private System.DateTime oldTime;
    private System.DateTime nowTime;

    void Start()
    {
        oldTime = System.DateTime.Now;
    }

    void Update()
    {
        nowTime = System.DateTime.Now;
        System.TimeSpan ts1 = new System.TimeSpan(oldTime.Ticks);
        System.TimeSpan ts2 = new System.TimeSpan(nowTime.Ticks);
        System.TimeSpan ts = ts2.Subtract(ts1).Duration();

        if (ts.Seconds > 30 && !Input.anyKey)
        {
            flag_Roable = true;
            oldTime = System.DateTime.Now;
        }

        if (flag_Roable && Input.anyKey)
        {
            flag_Roable = false;
        }

        if (flag_Roable)//自動旋轉
        {
            x -= Time.deltaTime * 30;
            var rotation = Quaternion.Euler(0, x, 0);
            transform.RotateAround(target.position, Vector3.up, 0.3f);
        }
        else
        {
            if (Input.GetMouseButton(1))
            {
                if (Input.GetAxis("Mouse X") < 0)
                    transform.RotateAround(target.position, Vector3.down, 4);
                if (Input.GetAxis("Mouse X") > 0)
                    transform.RotateAround(target.position, Vector3.up, 4);
            }
            else if (Input.GetAxis("Mouse ScrollWheel") != 0)
            {
                if (normalDistance >= MouseZoomMin && normalDistance <= MouseZoomMax)
                {
                    normalDistance -= Input.GetAxis("Mouse ScrollWheel") * MouseWheelSensitivity;
                }
                if (normalDistance < MouseZoomMin)
                {
                    normalDistance = MouseZoomMin;
                }
                if (normalDistance > MouseZoomMax)
                {
                    normalDistance = MouseZoomMax;
                }
                transform.camera.fieldOfView = normalDistance;
            }
            else if (Input.GetMouseButton(0))
            {
                if (Input.GetAxis("Mouse Y") < 0)  //down
                {
                    Vector3 temp = Vector3.up * 60.0f * Time.deltaTime;
                    print("wyz==up===" + transform.localPosition.y);
                    if (transform.localPosition.y > 300)
                    {
                        temp = Vector3.up * 5.0f * Time.deltaTime;
                        transform.Translate(temp);
                    }
                    else
                    {
                        transform.Translate(temp);
                    }
                }

                if (Input.GetAxis("Mouse Y") > 0)  //up 
                {
                    print("wyz==donw===" + transform.localPosition.y);
                    Vector3 temp = Vector3.down * 60.0f * Time.deltaTime;

                    if (transform.localPosition.y < -300)
                    {
                        temp = Vector3.up * 5.0f * Time.deltaTime;
                        transform.Translate(temp);
                    }
                    else
                    {
                        transform.Translate(temp);
                    }
                }
            }
        }
    }

}

轉載自：http://blog.csdn.net/qivan/article/details/9498667