- Qt 5.5
- Qt3D Module
- Qt3D: C++ Example
- main.cpp Example File
- Qt 5.5.1 Reference Documentation

# main.cpp Example File

cpp_example/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
    ** Contact: http://www.qt-project.org/legal
    **
    ** This file is part of the Qt3D module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL3$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and The Qt Company. For licensing terms
    ** and conditions see http://www.qt.io/terms-conditions. For further
    ** information use the contact form at http://www.qt.io/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 3 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.LGPLv3 included in the
    ** packaging of this file. Please review the following information to
    ** ensure the GNU Lesser General Public License version 3 requirements
    ** will be met: https://www.gnu.org/licenses/lgpl.html.
    **
    ** GNU General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU
    ** General Public License version 2.0 or later as published by the Free
    ** Software Foundation and appearing in the file LICENSE.GPL included in
    ** the packaging of this file. Please review the following information to
    ** ensure the GNU General Public License version 2.0 requirements will be
    ** met: http://www.gnu.org/licenses/gpl-2.0.html.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #include <QGuiApplication>

    #include <window.h>
    #include <Qt3DCore/qcamera.h>
    #include <Qt3DCore/qentity.h>
    #include <Qt3DCore/qcameralens.h>
    #include <Qt3DCore/qaspectengine.h>

    #include <Qt3DInput/QInputAspect>

    #include <Qt3DRenderer/qtorusmesh.h>
    #include <Qt3DRenderer/qmesh.h>
    #include <Qt3DRenderer/qtechnique.h>
    #include <Qt3DRenderer/qmaterial.h>
    #include <Qt3DRenderer/qeffect.h>
    #include <Qt3DRenderer/qtexture.h>
    #include <Qt3DRenderer/qrenderpass.h>
    #include <Qt3DRenderer/qsceneloader.h>

    #include <Qt3DCore/qtranslatetransform.h>
    #include <Qt3DCore/qmatrixtransform.h>
    #include <Qt3DCore/qrotatetransform.h>
    #include <Qt3DCore/qlookattransform.h>
    #include <Qt3DCore/qtransform.h>

    #include <Qt3DRenderer/qcameraselector.h>
    #include <Qt3DRenderer/qrenderpassfilter.h>
    #include <Qt3DRenderer/qtechniquefilter.h>
    #include <Qt3DRenderer/qviewport.h>
    #include <Qt3DRenderer/qrenderaspect.h>
    #include <Qt3DRenderer/qframegraph.h>
    #include <Qt3DRenderer/qclearbuffer.h>

    int main(int ac, char **av)
    {
        QGuiApplication app(ac, av);

        Window view;
        Qt3D::QAspectEngine engine;
        engine.registerAspect(new Qt3D::QRenderAspect());
        Qt3D::QInputAspect *input = new Qt3D::QInputAspect;
        engine.registerAspect(input);
        engine.initialize();
        QVariantMap data;
        data.insert(QStringLiteral("surface"), QVariant::fromValue(static_cast<QSurface *>(&view)));
        data.insert(QStringLiteral("eventSource"), QVariant::fromValue(&view));
        engine.setData(data);

        // Root entity
        Qt3D::QEntity *rootEntity = new Qt3D::QEntity();
        rootEntity->setObjectName(QStringLiteral("rootEntity"));
        // Torus
        Qt3D::QEntity *torusEntity = new Qt3D::QEntity(rootEntity);

        // Torus shape data
        Qt3D::QTorusMesh *torus = new Qt3D::QTorusMesh();
        torus->setRadius(40);
        torus->setMinorRadius(15);

        torusEntity->addComponent(torus);

        // TorusMesh Transform
        Qt3D::QTranslateTransform *torusTranslation = new Qt3D::QTranslateTransform();
        Qt3D::QRotateTransform *torusRotation = new Qt3D::QRotateTransform();
        Qt3D::QTransform *torusTransforms = new Qt3D::QTransform();

        torusTranslation->setTranslation(QVector3D(-5.0f, 3.5f, 2.0f));
        torusRotation->setAxis(QVector3D(1, 0, 0));
        torusRotation->setAngleDeg(35.0f);
        torusTransforms->addTransform(torusTranslation);
        torusTransforms->addTransform(torusRotation);
        torusEntity->addComponent(torusTransforms);

        // Scene file
        Qt3D::QEntity *sceneEntity = new Qt3D::QEntity(rootEntity);
        Qt3D::QSceneLoader  *scene = new Qt3D::QSceneLoader();
        scene->setObjectName(QStringLiteral("scene"));
        Qt3D::QTransform *sceneTransform = new Qt3D::QTransform();
        Qt3D::QTranslateTransform *sceneTranslateTransform = new Qt3D::QTranslateTransform();
        sceneTranslateTransform->setDx(2.5);
        sceneTranslateTransform->setDy(0.5);
        sceneTranslateTransform->setDz(-10);
        sceneTransform->addTransform(sceneTranslateTransform);
        sceneEntity->addComponent(sceneTransform);
    //    scene->setSource(":/assets/gltf/wine/wine.json");
        scene->setSource(QUrl("qrc:/assets/test_scene.dae"));
        sceneEntity->addComponent(scene);

        // Camera
        Qt3D::QCamera *cameraEntity = new Qt3D::QCamera(rootEntity);
        cameraEntity->setObjectName(QStringLiteral("cameraEntity"));

        cameraEntity->lens()->setPerspectiveProjection(60.0f, 16.0f/9.0f, 0.1f, 1000.0f);
        cameraEntity->setPosition(QVector3D(-5, 0, -20.0f));
        cameraEntity->setViewCenter(QVector3D(11, 0, 5));
        cameraEntity->setUpVector(QVector3D(0, 1, 0));
        input->setCamera(cameraEntity);

        // FrameGraph
        Qt3D::QFrameGraph *frameGraph = new Qt3D::QFrameGraph();
        Qt3D::QTechniqueFilter *techniqueFilter = new Qt3D::QTechniqueFilter();
        Qt3D::QViewport *viewport = new Qt3D::QViewport(techniqueFilter);
        Qt3D::QClearBuffer *clearBuffer = new Qt3D::QClearBuffer(viewport);
        Qt3D::QCameraSelector *cameraSelector = new Qt3D::QCameraSelector(clearBuffer);
        (void) new Qt3D::QRenderPassFilter(cameraSelector);

        // TechiqueFilter and renderPassFilter are not implement yet
        viewport->setRect(QRectF(0, 0, 1, 1));
        clearBuffer->setBuffers(Qt3D::QClearBuffer::ColorDepthBuffer);
        cameraSelector->setCamera(cameraEntity);
        frameGraph->setActiveFrameGraph(techniqueFilter);

        // Setting the FrameGraph
        rootEntity->addComponent(frameGraph);

        // Set root object of the scene
        engine.setRootEntity(rootEntity);
        // Show window
        view.show();

        return app.exec();
    }