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

# main.cpp Example File

simple-cpp/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.
    **
    ** $QT_END_LICENSE$
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    ****************************************************************************/

    #include <QGuiApplication>

    #include <Qt3DCore/QEntity>
    #include <Qt3DCore/QCamera>
    #include <Qt3DCore/QCameraLens>
    #include <Qt3DCore/QTransform>
    #include <Qt3DCore/QLookAtTransform>
    #include <Qt3DCore/QScaleTransform>
    #include <Qt3DCore/QRotateTransform>
    #include <Qt3DCore/QTranslateTransform>
    #include <Qt3DCore/QAspectEngine>

    #include <Qt3DInput/QInputAspect>

    #include <Qt3DRenderer/QRenderAspect>
    #include <Qt3DRenderer/QFrameGraph>
    #include <Qt3DRenderer/QForwardRenderer>
    #include <Qt3DRenderer/QPhongMaterial>

    #include <Qt3DRenderer/QCylinderMesh>
    #include <Qt3DRenderer/QSphereMesh>
    #include <Qt3DRenderer/QTorusMesh>
    #include <Qt3DRenderer/QWindow>

    #include <QPropertyAnimation>

    int main(int argc, char* argv[])
    {
        QGuiApplication app(argc, argv);
        Qt3D::QWindow view;
        Qt3D::QInputAspect *input = new Qt3D::QInputAspect;
        view.registerAspect(input);

        // Root entity
        Qt3D::QEntity *rootEntity = new Qt3D::QEntity();

        // Camera
        Qt3D::QCamera *cameraEntity = view.defaultCamera();

        cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
        cameraEntity->setPosition(QVector3D(0, 0, -40.0f));
        cameraEntity->setUpVector(QVector3D(0, 1, 0));
        cameraEntity->setViewCenter(QVector3D(0, 0, 0));
        input->setCamera(cameraEntity);

        // Material
        Qt3D::QMaterial *material = new Qt3D::QPhongMaterial(rootEntity);

        // Torus
        Qt3D::QEntity *torusEntity = new Qt3D::QEntity(rootEntity);
        Qt3D::QTorusMesh *torusMesh = new Qt3D::QTorusMesh;
        torusMesh->setRadius(5);
        torusMesh->setMinorRadius(1);
        torusMesh->setRings(100);
        torusMesh->setSlices(20);

        Qt3D::QTransform *torusTransform = new Qt3D::QTransform;
        Qt3D::QScaleTransform *torusScaleTransform = new Qt3D::QScaleTransform;
        torusScaleTransform->setScale3D(QVector3D(1.5, 1, 0.5));

        Qt3D::QRotateTransform *torusRotateTransform = new Qt3D::QRotateTransform;
        torusRotateTransform->setAxis(QVector3D(1, 0, 0));
        torusRotateTransform->setAngleDeg(45);

        torusTransform->addTransform(torusScaleTransform);
        torusTransform->addTransform(torusRotateTransform);

        torusEntity->addComponent(torusMesh);
        torusEntity->addComponent(torusTransform);
        torusEntity->addComponent(material);

        // Sphere
        Qt3D::QEntity *sphereEntity = new Qt3D::QEntity(rootEntity);
        Qt3D::QSphereMesh *sphereMesh = new Qt3D::QSphereMesh;
        sphereMesh->setRadius(3);

        Qt3D::QTransform *sphereTransform = new Qt3D::QTransform;
        Qt3D::QTranslateTransform *sphereTranslateTransform = new Qt3D::QTranslateTransform;
        sphereTranslateTransform->setTranslation(QVector3D(20, 0, 0));

        Qt3D::QRotateTransform *sphereRotateTransform = new Qt3D::QRotateTransform;
        QPropertyAnimation *sphereRotateTransformAnimation = new QPropertyAnimation(sphereRotateTransform);
        sphereRotateTransformAnimation->setTargetObject(sphereRotateTransform);
        sphereRotateTransformAnimation->setPropertyName("angle");
        sphereRotateTransformAnimation->setStartValue(QVariant::fromValue(0));
        sphereRotateTransformAnimation->setEndValue(QVariant::fromValue(360));
        sphereRotateTransformAnimation->setDuration(10000);
        sphereRotateTransformAnimation->setLoopCount(-1);
        sphereRotateTransformAnimation->start();

        sphereRotateTransform->setAxis(QVector3D(0, 1, 0));
        sphereRotateTransform->setAngleDeg(0);

        sphereTransform->addTransform(sphereTranslateTransform);
        sphereTransform->addTransform(sphereRotateTransform);

        sphereEntity->addComponent(sphereMesh);
        sphereEntity->addComponent(sphereTransform);
        sphereEntity->addComponent(material);

        view.setRootEntity(rootEntity);
        view.show();

        return app.exec();
    }