docs: public void setControllerModel(GVRSceneObject controllerModel)
      {
          if (mControllerModel != null)
          {
              mControllerGroup.removeChildObject(mControllerModel);
          }
          mControllerModel = controllerModel;
          mControllerGroup.addChildObject(mControllerModel);
          mControllerModel.setEnable(mShowControllerModel);
      }