How can i rotate 3D object with joystick in all directions?

Hello, i am developing mobile game. I have a scene in which i have a 3D object and a joystick that should rotate this object in all directions depending on joystick position. I have a working code for joystick :

 public class Joystick : MonoBehaviour, IDragHandler, IPointerUpHandler, IPointerDownHandler {

 private Image bgImg;
 private Image joystickImg;
 public Vector3 InputDirection { set; get; }

 private void Start()
 {
     bgImg = GetComponent<Image>();
     joystickImg = transform.GetChild(0).GetComponent<Image>();
     InputDirection = Vector3.zero;
 }
 public virtual void OnDrag(PointerEventData ped)
 {
     Vector2 pos = Vector2.zero;
     if (RectTransformUtility.ScreenPointToLocalPointInRectangle
         (bgImg.rectTransform,
             ped.position,
             ped.pressEventCamera,
             out pos))
     {
         pos.x = (pos.x / bgImg.rectTransform.sizeDelta.x);
         pos.y = (pos.y / bgImg.rectTransform.sizeDelta.y);

         float x = (bgImg.rectTransform.pivot.x == 1) ? pos.x * 2 + 1 : pos.x * 2 - 1;
         float y = (bgImg.rectTransform.pivot.y == 1) ? pos.y * 2 + 1 : pos.y * 2 - 1;

         InputDirection = new Vector3(x, 0, y);
         InputDirection = (InputDirection.magnitude > 1) ? InputDirection.normalized : InputDirection;

         joystickImg.rectTransform.anchoredPosition =
             new Vector3(InputDirection.x * (bgImg.rectTransform.sizeDelta.x / 3),
             InputDirection.z * (bgImg.rectTransform.sizeDelta.y / 3));
     }
 }
 public virtual void OnPointerDown(PointerEventData ped)
 {
     OnDrag(ped);
 }
 public virtual void OnPointerUp(PointerEventData ped)
 {
     InputDirection = Vector3.zero;
     joystickImg.rectTransform.anchoredPosition = Vector3.zero;
 }

}

Now i can't figure out what to do in another script to achieve rotation on this 3D object other than creating reference to this joystick. I would be really glad if someone could suggest me how to deal with this problem.

Thank you for your help :)