qt-everywhere-src-5.14.1/qt3d/tests/manual/dynamicscene-cpp/main.cpp

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#include <QGuiApplication>

#include <Qt3DCore/QAspectEngine>
#include <Qt3DRender/QCamera>

#include <Qt3DInput/QInputAspect>

#include <Qt3DRender/QRenderAspect>
#include <Qt3DExtras/QForwardRenderer>

#include "examplescene.h"
#include <Qt3DExtras/qt3dwindow.h>
#include <Qt3DExtras/qfirstpersoncameracontroller.h>

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

    ExampleScene *sceneRoot = new ExampleScene();

    // Scene Camera
    Qt3DRender::QCamera *basicCamera = view.camera();
    basicCamera->setProjectionType(Qt3DRender::QCameraLens::PerspectiveProjection);
    basicCamera->setAspectRatio(view.width() / view.height());
    basicCamera->setUpVector(QVector3D(0.0f, 1.0f, 0.0f));
    basicCamera->setViewCenter(QVector3D(0.0f, 3.5f, 0.0f));
    basicCamera->setPosition(QVector3D(0.0f, 3.5f, 25.0f));

    // For camera controls
    Qt3DExtras::QFirstPersonCameraController *camController = new Qt3DExtras::QFirstPersonCameraController(sceneRoot);
    camController->setCamera(basicCamera);

    view.setRootEntity(sceneRoot);
    view.show();

    return app.exec();
}