Qt Quick 3D - RuntimeLoader Example

 // Copyright (C) 2021 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 #ifdef HAS_MODULE_QT_WIDGETS
 # include <QApplication>
 #endif
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
 #include <QQuickWindow>
 #include <QtQuick3D/qquick3d.h>

 int main(int argc, char *argv[])
 {
 #ifdef HAS_MODULE_QT_WIDGETS
     QApplication app(argc, argv);
 #else
     QGuiApplication app(argc, argv);
 #endif
     app.setOrganizationName("The Qt Company");
     app.setOrganizationDomain("qt.io");
     app.setApplicationName("Runtime Asset Loading Example");

     const auto importUrl = argc > 1 ? QUrl::fromLocalFile(argv[1]) : QUrl{};
     if (importUrl.isValid())
         qDebug() << "Importing" << importUrl;

     QSurfaceFormat::setDefaultFormat(QQuick3D::idealSurfaceFormat(4));

     QQmlApplicationEngine engine;
     const QUrl url(QStringLiteral("qrc:/main.qml"));
     engine.load(url);

     if (engine.rootObjects().isEmpty()) {
         qWarning() << "Could not find root object in" << url;
         return -1;
     }

     QObject *topLevel = engine.rootObjects().value(0);
     QQuickWindow *window = qobject_cast<QQuickWindow *>(topLevel);

     if (window)
         window->setProperty("importUrl", importUrl);

     return app.exec();
 }