 have not loaded the data yet
    if (!countryInfos) {
      return;
    }

    const position = getCanvasRelativePosition(event);
    const id = pickHelper.pick(position, pickingScene, camera);
    if (id > 0) {
      // we clicked a country. Toggle its 'selected' property
      const countryInfo = countryInfos[id - 1];
      const selected = !countryInfo.selected;
      // if we're selecting this country and modifiers are not
      // pressed unselect everything else.
      if (selected && !event.shiftKey