public override void StopTouching(GameObject previousTouchingObject)
    {
        base.StopTouching(previousTouchingObject);

        VRTK_ControllerActions action = previousTouchingObject.GetComponent <VRTK_ControllerActions> ();

        action.ToggleHighlightGrip(false);
        action.SetControllerOpacity(1f);
    }
    //override the functions which are triggered when the controller start or stop touching this door object.
    public override void StartTouching(GameObject currentTouchingObject)
    {
        base.StartTouching(currentTouchingObject);

        if ((controller.position - transform.position).magnitude < 0.5)
        {
            VRTK_ControllerActions action = currentTouchingObject.GetComponent <VRTK_ControllerActions> ();
            action.ToggleHighlightGrip(true, Color.yellow);
            action.SetControllerOpacity(0.5f);
        }
    }
 private void DoGripPressed(object sender, ControllerInteractionEventArgs e)
 {
     _tooltips.ShowTips(true, VRTK_ControllerTooltips.TooltipButtons.GripTooltip);
     actions.ToggleHighlightGrip(true, Color.yellow, 0.5f);
     actions.SetControllerOpacity(0.8f);
 }