Qt 5.6 | Qt 3D | Qt 3D: C++ Example | main.cpp Example File

Qt 5.6.3 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.
      **
      ** $QT_BEGIN_LICENSE:LGPL3$
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      **
      ** 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
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      #include <QGuiApplication>

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

      #include <Qt3DInput/QInputAspect>

      #include <Qt3DRender/qtorusmesh.h>
      #include <Qt3DRender/qmesh.h>
      #include <Qt3DRender/qtechnique.h>
      #include <Qt3DRender/qmaterial.h>
      #include <Qt3DRender/qeffect.h>
      #include <Qt3DRender/qtexture.h>
      #include <Qt3DRender/qrenderpass.h>
      #include <Qt3DRender/qsceneloader.h>
      #include <Qt3DRender/qcameraselector.h>
      #include <Qt3DRender/qrenderpassfilter.h>
      #include <Qt3DRender/qtechniquefilter.h>
      #include <Qt3DRender/qviewport.h>
      #include <Qt3DRender/qrenderaspect.h>
      #include <Qt3DRender/qframegraph.h>
      #include <Qt3DRender/qclearbuffer.h>

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

          Window view;
          Qt3DCore::QAspectEngine engine;
          engine.registerAspect(new Qt3DRender::QRenderAspect());
          Qt3DInput::QInputAspect *input = new Qt3DInput::QInputAspect;
          engine.registerAspect(input);
          QVariantMap data;
          data.insert(QStringLiteral("surface"), QVariant::fromValue(static_cast<QSurface *>(&view)));
          data.insert(QStringLiteral("eventSource"), QVariant::fromValue(&view));
          engine.setData(data);

          // Root entity
          Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();
          rootEntity->setObjectName(QStringLiteral("rootEntity"));
          // Torus
          Qt3DCore::QEntity *torusEntity = new Qt3DCore::QEntity(rootEntity);

          // Torus shape data
          Qt3DRender::QTorusMesh *torus = new Qt3DRender::QTorusMesh();
          torus->setRadius(40);
          torus->setMinorRadius(15);

          torusEntity->addComponent(torus);

          // TorusMesh Transform
          Qt3DCore::QTransform *torusTransforms = new Qt3DCore::QTransform();
          torusTransforms->setTranslation(QVector3D(-5.0f, 3.5f, 2.0f));
          torusTransforms->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 35.0f));
          torusEntity->addComponent(torusTransforms);

          // Scene file
          Qt3DCore::QEntity *sceneEntity = new Qt3DCore::QEntity(rootEntity);
          Qt3DRender::QSceneLoader *scene = new Qt3DRender::QSceneLoader();
          scene->setObjectName(QStringLiteral("scene"));
          Qt3DCore::QTransform *sceneTransform = new Qt3DCore::QTransform();
          sceneTransform->setTranslation(QVector3D(2.5f, 0.5f, -10.0f));
          sceneEntity->addComponent(sceneTransform);
          scene->setSource(QUrl("qrc:/assets/test_scene.dae"));
          sceneEntity->addComponent(scene);

          // Camera
          Qt3DCore::QCamera *cameraEntity = new Qt3DCore::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
          Qt3DRender::QFrameGraph *frameGraph = new Qt3DRender::QFrameGraph();
          Qt3DRender::QTechniqueFilter *techniqueFilter = new Qt3DRender::QTechniqueFilter();
          Qt3DRender::QViewport *viewport = new Qt3DRender::QViewport(techniqueFilter);
          Qt3DRender::QClearBuffer *clearBuffer = new Qt3DRender::QClearBuffer(viewport);
          Qt3DRender::QCameraSelector *cameraSelector = new Qt3DRender::QCameraSelector(clearBuffer);
          (void) new Qt3DRender::QRenderPassFilter(cameraSelector);

          // TechiqueFilter and renderPassFilter are not implement yet
          viewport->setRect(QRectF(0, 0, 1, 1));
          clearBuffer->setBuffers(Qt3DRender::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();
      }