void GameLayer::resetMeteor(void) {
   //if too many objects on screen, return
    if (_fallingObjects.size() > 30) return;
    
    auto meteor = _meteorPool.at(_meteorPoolIndex);
      _meteorPoolIndex++;
    if (_meteorPoolIndex == _meteorPool.size()) 
      _meteorPoolIndex = 0;
      int meteor_x = rand() % (int) (_screenSize.width * 0.8f) + _screenSize.width * 0.1f;
   int meteor_target_x = rand() % (int) (_screenSize.width * 0.8f) + _screenSize.width * 0.1f;
    
    meteor->stopAllActions();
    meteor->setPosition(Vec2(meteor_x, _screenSize.height + meteor->getBoundingBox().size.height * 0.5));
  
    //create action
    auto  rotate = RotateBy::create(0.5f ,  -90);
    auto  repeatRotate = RepeatForever::create( rotate );
    auto  sequence = Sequence::create (
    ...