Qt Quick 3D - Stencil Outline Extension Example

 // Copyright (C) 2023 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #include <QGuiApplication>
 #include <QQmlApplicationEngine>

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

     QQmlApplicationEngine engine;
     const QUrl url("qrc:/QtQuick3D/Examples/OutlineRenderExtension/Main.qml");
     QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
             &app, [url](QObject *obj, const QUrl &objUrl) {
                 if (!obj && url == objUrl)
                     QCoreApplication::exit(-1);
             }, Qt::QueuedConnection);
     engine.load(url);

     return app.exec();
 }