// ResourceLoader resourceLoader = new PolygonResourceLoader(game.getWorld());
ResourceLoader resourceLoader = new ImageResourceLoader(game.getWorld());
// Renderer renderer = new SimpleRenderer();
Renderer renderer = new QuadTreeRenderer(resourceLoader, game.getWorld());
MainGame mainGame = new MainGame(this, renderer, screenWidth, screenHeight);
mainGame.render();
mainScene.setRoot(mainGame);
stage.setWidth(screenWidth);
stage.setHeight(screenHeight);
stage.setScene(mainScene);
} else {