Qt 5.9 | Qt 3D | Qt 3D: Simple C++ Example | main.cpp Example File

Qt 5.9.3 Reference Documentation

# main.cpp Example File

simple-cpp/main.cpp

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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();
      }