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

# main.cpp Example File

cylinder-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
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    ** 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 <window.h>
    #include <Qt3DCore/qcamera.h>
    #include <Qt3DCore/qentity.h>
    #include <Qt3DCore/qcameralens.h>

    #include <Qt3DInput/QInputAspect>

    #include <Qt3DRenderer/qcylindermesh.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 <Qt3DCore/qscaletransform.h>
    #include <Qt3DCore/qrotatetransform.h>
    #include <Qt3DCore/qlookattransform.h>
    #include <Qt3DCore/qtransform.h>
    #include <Qt3DCore/qaspectengine.h>

    #include <Qt3DRenderer/qrenderaspect.h>
    #include <Qt3DRenderer/qframegraph.h>
    #include <Qt3DRenderer/qforwardrenderer.h>

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

        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();

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

        cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
        cameraEntity->setPosition(QVector3D(0, 0, -20.0f));
        cameraEntity->setUpVector(QVector3D(0, 1, 0));
        cameraEntity->setViewCenter(QVector3D(0, 0, 0));
        input->setCamera(cameraEntity);

        // FrameGraph
        Qt3D::QFrameGraph *frameGraph = new Qt3D::QFrameGraph();
        Qt3D::QForwardRenderer * forwardRenderer = new Qt3D::QForwardRenderer();

        // TechiqueFilter and renderPassFilter are not implement yet
        forwardRenderer->setCamera(cameraEntity);
        forwardRenderer->setClearColor(Qt::black);

        frameGraph->setActiveFrameGraph(forwardRenderer);

        // Cylinder shape data
        Qt3D::QCylinderMesh *cylinder = new Qt3D::QCylinderMesh();
        cylinder->setRadius(1);
        cylinder->setLength(3);
        cylinder->setRings(100);
        cylinder->setSlices(20);

        // CylinderMesh Transform
        Qt3D::QScaleTransform *cylinderScale = new Qt3D::QScaleTransform();
        Qt3D::QRotateTransform *cylinderRotation = new Qt3D::QRotateTransform();
        Qt3D::QTransform *cylinderTransforms = new Qt3D::QTransform();

        cylinderScale->setScale3D(QVector3D(1.5f, 1.5f, 1.5f));
        cylinderRotation->setAngleDeg(45.0f);
        cylinderRotation->setAxis(QVector3D(1, 0, 0));

        cylinderTransforms->addTransform(cylinderScale);
        cylinderTransforms->addTransform(cylinderRotation);

        // Cylinder
        Qt3D::QEntity *cylinderEntity = new Qt3D::QEntity(rootEntity);
        cylinderEntity->addComponent(cylinder);
        cylinderEntity->addComponent(cylinderTransforms);

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

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

        return app.exec();
    }