class Scene {
    World* world
    Player* player
    Enemy* boss
    Camera* camera
}

State* gameState = new State();
gameState->addScene(scene);

State::update(double delta) {
    scene->update(delta);
}

State::update(double delta) {
    physicsSystem->applyPhysics(scene);
}

State::render() {
    renderSystem->render(scene);
}

RenderSystem::renderScene(Scene* scene) {
    Camera* camera = scene->camera;
    lookAt(camera); // Set up the appropriate viewing matrices based on
                    // the camera location and direction

    renderHeightmap(scene->getWorld()->getHeightMap()); // Just as an example, you might
                                                        // use a height map as your world
                                                        // representation.
    renderModel(scene->getPlayer()->getType()); // getType() will return, for example "orc"
                                                // or "human"

    renderModel(scene->getBoss()->getType());
}