Qt3D & QSlider

Silenzio76

Greetings,

I wrote this piece of code to render my Obj file:

Qt3DCore::QEntity * add3dElements(Qt3DExtras::Qt3DWindow *view){
    Qt3DCore::QEntity *eRoot = new Qt3DCore::QEntity;

    Qt3DRender::QCamera *cCam = view->camera();
    /*cCam->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    cCam->setPosition(QVector3D(0, 0, 8.0f));
    cCam->setUpVector(QVector3D(0, 1, 0));
    cCam->setViewCenter(QVector3D(0, 0, 0));*/
    cCam->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    cCam->setProjectionType(Qt3DRender::QCameraLens::PerspectiveProjection);
    cCam->setAspectRatio(view->width() / view->height());
    cCam->setUpVector(QVector3D(0.0f, 1.0f, 0.0f));
    //cCam->setViewCenter(QVector3D(0.04f, 1.0f, 0.0f));
    cCam->setViewCenter(QVector3D(0, 0, 0));
    //cCam->setPosition(QVector3D(0.0f, 2.5f, 2.1f));
    cCam->setPosition(QVector3D(0, 0, 8.0f));
    cCam->setNearPlane(0.001f);
    cCam->setFarPlane(100.0f);

    Qt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController();
    camController->setCamera(cCam);


    Qt3DCore::QEntity *eLight = new Qt3DCore::QEntity(eRoot);

    Qt3DRender::QPointLight *plPoint = new Qt3DRender::QPointLight(eLight);
    plPoint->setColor("silver");
    plPoint->setIntensity(2);
    eLight->addComponent(plPoint);

    Qt3DCore::QTransform *tLightMng = new Qt3DCore::QTransform(eLight);
    tLightMng->setTranslation(cCam->position());
    eLight->addComponent(tLightMng);

    Qt3DCore::QEntity *eModel = new Qt3DCore::QEntity(eRoot);
    Qt3DRender::QMesh *mModel = new Qt3DRender::QMesh();
    mModel->setSource(QUrl("qrc:/truck"));

    Qt3DExtras::QPhongMaterial *pmModel = new Qt3DExtras::QPhongMaterial();
    pmModel->setDiffuse(QColor(Qt::lightGray));



    Qt3DCore::QTransform *tModelMng = new Qt3DCore::QTransform();
    tModelMng->setScale(0.45f);
    tModelMng->setRotation(QQuaternion::fromEulerAngles(0.0, 0.0, 0.0));

    eModel->addComponent(mModel);
    eModel->addComponent(tModelMng);
    eModel->addComponent(pmModel);


    view->setRootEntity(eRoot);
    return eRoot;
};

It's possible link c++ via 3 QSlider to the QCamera or the QTransform component to manage Pitch, Yaw and Zoom?
Did code's samples exist to do that?

Thank you in advance

SGaist

Hi,

This example shows how to use QCheckBoxes but you'll get the idea on how to mix controls and a Qt3D scene.

Silenzio76

the problem is to link the "tModelMng->setRotation(QQuaternion::fromEulerAngles(0.0, 0.0, 0.0));"

to the QSlider/QDial to set the rotation and zoom, like Qt 3D: Scene2D QML Example, but in c++ code, not to retrieve the "Enabled" property.

SGaist

Don't link them directly, link your sliders to a slot where you call tModelMng->setRotation(QQuaternion::fromEulerAngles(pitchSlider->value(), yawSlider->value(), rollSlider->value()));.

Silenzio76

Already tryed, not works!
How can retrieve the QTransform Obj?
I had tryed iteration, dynamic casting, but nothing seems to work

SGaist

Can you provide a minimal compilable example that shows what you are trying to achieve ?

Silenzio76

@SGaist to the function above add:

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    //keypad global management
    

    QWidget *widget = new QWidget;
     QVBoxLayout *vSceneLayout = new QVBoxLayout();
    QWidget *wSpacer = new QWidget();
   wSpacer->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
    QLabel *lbPitch = new QLabel("Pitch rot.");
    QDial *dPicth = new QDial();
    dPicth->setMaximum(36000);
    dPicth->setValue(0);
    QLabel *lbYaw = new QLabel("Yaw rot.");
    QDial *dYaw = new QDial();
    dYaw->setMaximum(36000);
    dYaw->setValue(0);
    QLabel *lbZoom = new QLabel("Zoom");
    QSlider *sZoom = new QSlider(Qt::Horizontal);
    sZoom->setTickInterval(10);
    sZoom->setValue(45);
    sZoom->setMinimum(0);
    sZoom->setMaximum(10000);
    setSliderStyle(sZoom);
    QHBoxLayout *hlCmd = new QHBoxLayout();
    hlCmd->addWidget(wSpacer);
    hlCmd->addWidget(lbPitch);
    hlCmd->addWidget(dPicth);
    hlCmd->addWidget(lbYaw);
    hlCmd->addWidget(dYaw);
    hlCmd->addWidget(lbZoom);
    hlCmd->addWidget(sZoom);

    Qt3DExtras::Qt3DWindow *view = new Qt3DExtras::Qt3DWindow();
    view->defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));
    Qt3DCore::QEntity *scene = add3dElements(view);

Qt3DCore::QTransform *meshTrans = new Qt3DCore::QTransform(scene);
    QObject::connect(dPitch, &QDial::valueChanged, [=] (float) {
        meshTrans->setRotationX(dPitch->value()/100);
        scene->addComponent(meshTrans);
    });

    QObject::connect(dYaw, &QDial::valueChanged, [=] (float) {
        meshTrans->setRotationY(dYaw->value()/100);
        scene->addComponent(meshTrans);
    });
       
    view->setRootEntity(scene);
    QWidget *container = QWidget::createWindowContainer(view);

    vSceneLayout->addWidget(container, 1);
    vSceneLayout->addLayout(hlCmd);
    hLayout->addLayout(vSceneLayout, 1);

    widget->setWindowState(Qt::WindowMaximized);
    widget->setGeometry(QGuiApplication::screens().at(0)->availableGeometry());

    widget->show();




    return app.exec();
}

SGaist

Can you also share the obj file you load ?

Silenzio76

You can get any object around
https://www.turbosquid.com/Search/3D-Models/free/obj

I'm working on the zoom slider not on the model

SGaist

Would it be possible to have complete working minimal buildable sample code ?
The two put together don't build out of the box and I'm currently getting only a grey zone.

Silenzio76

@SGaist
play/change this line to a value lesser of 1(ex.0.45f)

 Qt3DCore::QTransform *tModelMng = new Qt3DCore::QTransform();
**==>> tModelMng->setScale(0.45f);**
 tModelMng->setRotation(QQuaternion::fromEulerAngles(45.0f,30.0f, 0.0f));

[0_1559129464565_build-CargoAssistant-Desktop_Qt_5_12_0_MinGW_64_bit-Debug.7z.001](Uploading 100%) [0_1559129533552_build-CargoAssistant-Desktop_Qt_5_12_0_MinGW_64_bit-Debug.7z.002](Uploading 100%)

SGaist

I meant just the code so I can build it here.

Silenzio76

@SGaist [0_1559220017289_CargoAssistant.7z](Uploading 100%)
the system not permits me to upload !
tryed today and yesterday(not enough priviledge)!

arsinte_andrei

@Silenzio76 have you ever hear of git? try it.. is for your own good

Silenzio76

@arsinte_andrei never used mais voilà https://github.com/silenzio76/cargo

Silenzio76

can noone help me?

jsulm

@Silenzio76 You still did not upload code as @SGaist asked you.
You should not try to upload it here as it does not work.
Upload it to some file sharing service and put the link here.

arsinte_andrei

@Silenzio76 said in Qt3D & QSlider:

https://github.com/silenzio76/cargo

this is where hi post the code
in the github