رویداد OnMouseDrag و OnMouseDown اسکریپت درگ گیم ابجکت سه بعدی در یونیتی

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void OnMouseDown()
{
    screenPoint = Camera.main.WorldToScreenPoint(scanPos);

     offset = scanPos - Camera.main.ScreenToWorldPoint(
         new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
}

void OnMouseDrag()
{
    Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);

     Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
     transform.position = curPosition;
}