int main(int argc, char *argv[])
{

    QApplication app(argc, argv);
    Widget w;
    Qt3DExtras::Qt3DWindow *view = new Qt3DExtras::Qt3DWindow();
    view->defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));
    w.findChild<QWidget*>("CubeView")->QWidget::createWindowContainer(view);



    w.show();

    return app.exec();
}