/// <summary>
    /// Dreht das Objekt um 90° im Uhrzeigersinn.
    /// </summary>
    public void TurnRight()
    {
        Vector2 temp = oldDirection;

        oldDirection = direction;
        direction    = new Vector2(oldDirection.y, -oldDirection.x);
        if (GetComponent <Robot>() && GetComponent <Robot>().GrabbedObject != null)
        {
            List <InteractiveObject> grabbedObjects = new List <InteractiveObject>();
            InteractiveObject        grabbedObject  = GetComponent <Robot>().GrabbedObject;
            grabbedObjects.Add(grabbedObject);
            if (grabbedObject.GetComponent <WorldObjectGroup>())
            {
                foreach (WorldObject obj in grabbedObject.GetComponent <WorldObjectGroup>().objects)
                {
                    grabbedObjects.Add(obj.GetComponent <InteractiveObject>());
                }
            }
            grabbedObject.AdjustRelativePosition("Right");
            grabbedObject.MoveToRelativePosition();
        }
        gameObject.transform.rotation = Quaternion.AngleAxis(GetFacingAngle(direction), Vector3.forward);
    }