main.cpp Example File | Qt 3D 5.12.8

- Qt 5.12
- Qt 3D
- Qt 3D: Simple C++ Example
- main.cpp Example File
- Qt 5.12.8 Reference Documentation

# main.cpp Example File

simple-cpp/main.cpp

     /****************************************************************************
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     ** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
     ** Contact: https://www.qt.io/licensing/
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     #include <QGuiApplication>

     #include <Qt3DCore/QEntity>
     #include <Qt3DRender/QCamera>
     #include <Qt3DRender/QCameraLens>
     #include <Qt3DCore/QTransform>
     #include <Qt3DCore/QAspectEngine>

     #include <Qt3DInput/QInputAspect>

     #include <Qt3DRender/QRenderAspect>
     #include <Qt3DExtras/QForwardRenderer>
     #include <Qt3DExtras/QPhongMaterial>
     #include <Qt3DExtras/QCylinderMesh>
     #include <Qt3DExtras/QSphereMesh>
     #include <Qt3DExtras/QTorusMesh>

     #include <QPropertyAnimation>

     #include "qt3dwindow.h"
     #include "orbittransformcontroller.h"
     #include "qorbitcameracontroller.h"

     Qt3DCore::QEntity *createScene()
     {
         // Root entity
         Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;

         // Material
         Qt3DRender::QMaterial *material = new Qt3DExtras::QPhongMaterial(rootEntity);

         // Torus
         Qt3DCore::QEntity *torusEntity = new Qt3DCore::QEntity(rootEntity);
         Qt3DExtras::QTorusMesh *torusMesh = new Qt3DExtras::QTorusMesh;
         torusMesh->setRadius(5);
         torusMesh->setMinorRadius(1);
         torusMesh->setRings(100);
         torusMesh->setSlices(20);

         Qt3DCore::QTransform *torusTransform = new Qt3DCore::QTransform;
         torusTransform->setScale3D(QVector3D(1.5, 1, 0.5));
         torusTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 45.0f));

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

         // Sphere
         Qt3DCore::QEntity *sphereEntity = new Qt3DCore::QEntity(rootEntity);
         Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh;
         sphereMesh->setRadius(3);

         Qt3DCore::QTransform *sphereTransform = new Qt3DCore::QTransform;
         OrbitTransformController *controller = new OrbitTransformController(sphereTransform);
         controller->setTarget(sphereTransform);
         controller->setRadius(20.0f);

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

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

         return rootEntity;
     }

     int main(int argc, char* argv[])
     {
         QGuiApplication app(argc, argv);
         Qt3DExtras::Qt3DWindow view;

         Qt3DCore::QEntity *scene = createScene();

         // Camera
         Qt3DRender::QCamera *camera = view.camera();
         camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
         camera->setPosition(QVector3D(0, 0, 40.0f));
         camera->setViewCenter(QVector3D(0, 0, 0));

         // For camera controls
         Qt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController(scene);
         camController->setLinearSpeed( 50.0f );
         camController->setLookSpeed( 180.0f );
         camController->setCamera(camera);

         view.setRootEntity(scene);
         view.show();

         return app.exec();
     }