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OpenCascade 7.4 Qt 5.15 Visualization

Draw Harness and SamplesMon, 09/21/2020 - 23:042 replies

QuestionAuthorMon, 09/21/2020 - 23:04

I am attempting to create a Qt application in C++ which incorporates a 3D OCC visualization. I am new to OpenCascade and Qt and would like to put the visualization in a frame or widget, so that I can incorprate it into a layout. Does anyone know what I can do to get a simple 3D visualization to work inside of a QWidget/QFrame?

Thanks in advance.

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01Commenter-1Tue, 10/06/2020 - 16:48

Hello,

just take a look at the OCC Qt Samples, there is example there with QML and with QWidgets.

Best regards,

François.

02Commenter-2Wed, 11/04/2020 - 16:28

you need to bind the winId of Qwidget to the v3d_view. The sample code is follow:

    Handle(V3d_View) aView;
    Handle(AIS_InteractiveContext) aContext;
    Handle(V3d_Viewer) aViewer;

    Handle(WNT_Window) window;

    Handle(Aspect_DisplayConnection) aDisplayConnection = new Aspect_DisplayConnection();
    Handle(Graphic3d_GraphicDriver) aGraphicDriver;
    if(aGraphicDriver.IsNull())
    {
        aGraphicDriver = new OpenGl_GraphicDriver(aDisplayConnection);
    }

    Handle(V3d_Viewer) aViewer = new V3d_Viewer(aGraphicDriver);


    aViewer->SetDefaultLights();
    aViewer->SetLightOn();
    aViewer->ActivateGrid(Aspect_GridType::Aspect_GT_Rectangular,Aspect_GridDrawMode::Aspect_GDM_Lines);

    window = new WNT_Window((Aspect_Handle) windowId);
    if(!window->IsMapped())
    {
        window->Map();
    }
    window->SetBackground(Quantity_Color(1.,1.,1.,Quantity_TypeOfColor::Quantity_TOC_RGB));

    aView = aViewer->CreateView();
    aView->MustBeResized();
    aView->SetWindow(window);
    aView->SetBgGradientColors(Quantity_Color(1.,1.,1.,Quantity_TypeOfColor::Quantity_TOC_RGB),
                               Quantity_Color(0.4,0.6,0.8,Quantity_TypeOfColor::Quantity_TOC_RGB),
                               Aspect_GradientFillMethod::Aspect_GFM_DIAG1,Standard_True);
    aView->ZBufferTriedronSetup(Quantity_NOC_RED,Quantity_NOC_BLUE1 ,Quantity_NOC_GREEN ,1,0.05,12);
    aView->TriedronDisplay(Aspect_TOTP_LEFT_UPPER,Quantity_NOC_RED,
                           0.08,V3d_ZBUFFER);
    aView->SetImmediateUpdate(Standard_True);

    aContext = new AIS_InteractiveContext(aViewer);
    aContext->SetDisplayMode(AIS_DisplayMode::AIS_Shaded,Standard_True);

The windowID above is the id of the Qwidget which you want to bind.

At last you need to redraw the view in the paintEvent of Qwidget.

void paintEvent(QPaintEvent *e)
{
    aOccViewer->aView->Redraw();
}

if you want to display the shape, you can use aContext->Display().