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

Qt 5.6.3 Reference Documentation

# main.cpp Example File

cylinder-cpp/main.cpp

      /****************************************************************************
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      ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
      ** Contact: http://www.qt-project.org/legal
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      ** Alternatively, this file may be used under the terms of the GNU
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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 <Qt3DRender/qcylindermesh.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 <Qt3DCore/qtransform.h>
      #include <Qt3DCore/qaspectengine.h>

      #include <Qt3DRender/qrenderaspect.h>
      #include <Qt3DRender/qframegraph.h>
      #include <Qt3DRender/qforwardrenderer.h>

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

          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();

          // Camera
          Qt3DCore::QCamera *cameraEntity = new Qt3DCore::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
          Qt3DRender::QFrameGraph *frameGraph = new Qt3DRender::QFrameGraph();
          Qt3DRender::QForwardRenderer *forwardRenderer = new Qt3DRender::QForwardRenderer();

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

          frameGraph->setActiveFrameGraph(forwardRenderer);

          // Cylinder shape data
          Qt3DRender::QCylinderMesh *cylinder = new Qt3DRender::QCylinderMesh();
          cylinder->setRadius(1);
          cylinder->setLength(3);
          cylinder->setRings(100);
          cylinder->setSlices(20);

          // CylinderMesh Transform
          Qt3DCore::QTransform *cylinderTransform = new Qt3DCore::QTransform;
          cylinderTransform->setScale(1.5f);
          cylinderTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 45.0f));

          // Cylinder
          Qt3DCore::QEntity *cylinderEntity = new Qt3DCore::QEntity(rootEntity);
          cylinderEntity->addComponent(cylinder);
          cylinderEntity->addComponent(cylinderTransform);

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

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

          return app.exec();
      }