Scene* GameScene::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::createWithPhysics();

    // Agregamos la fisica a la escena
    scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_NONE);
    scene->getPhysicsWorld()->setGravity(Vec2(0,0));

    // 'layer' is an autorelease object
    auto layer = GameScene::create();

    // Seteamos la fisica de la escena en la capa
    layer->SetPhysicsWorld(scene->getPhysicsWorld());

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}