[osg-users] Osg Text issues

[OpenSceneGraph Users]

Hello, sorry for a late reply. I have digged further into this problem and 
figured out the source of the issue. I am using 3.6.4. release which was 
the latest at the time. The problem comes when launching OpenSceneGraph 
through a QOpenGlWIdget, i have used a simple example from 
https://vicrucann.github.io/tutorials/qt-osg-navigation/ , i will paste my 
code below so it is easier to follow(although most is copy pasted)


QtOSGWidget(QWidget* parent = 0)


      : QOpenGLWidget(parent)


        , _mGraphicsWindow(new osgViewer::GraphicsWindowEmbedded( this->x(), this->y(),


                                                                  this->width(), this->height() ) )


        , _mViewer(new osgViewer::Viewer)


      // take care of HDPI screen, e.g. Retina display on Mac


      , m_scale(QApplication::desktop()->devicePixelRatio())


      {


        _mGraphicsWindow->init();




        osg::Group* root = new osg::Group;




        osg::StateSet* rootStateSet = root->getOrCreateStateSet();


        rootStateSet->setMode( GL_DEPTH_TEST, osg::StateAttribute::ON );




        osgText::Text* text = new osgText::Text();


        text->setText("ABRAKADABRA");


        text->setCharacterSize(14);


        text->setCharacterSizeMode(osgText::Text::CharacterSizeMode::SCREEN_COORDS);


        text->setAutoRotateToScreen(true);


        text->setColor(osg::Vec4(0,0,0,1));




        osg::Geode* drawableText = new osg::Geode;


        drawableText->addDrawable(text);


        root->addChild(drawableText);




        osg::Camera* camera = new osg::Camera;


        camera->setViewport( 0, 0, this->width(), this->height() );


        camera->setClearColor( osg::Vec4( 0.9f, 0.9f, 1.f, 1.f ) );


        float aspectRatio = static_cast<float>( this->width()) / static_cast<float>( this->height() );


        camera->setProjectionMatrixAsPerspective( 30.f, aspectRatio, 1.f, 1000.f );


        camera->setGraphicsContext( _mGraphicsWindow );




        _mViewer->setCamera(camera);


        _mViewer->setSceneData(root);


        osgGA::TrackballManipulator* manipulator = new osgGA::TrackballManipulator;


        manipulator->setAllowThrow( false );


        this->setMouseTracking(true);


        _mViewer->setCameraManipulator(manipulator);


        _mViewer->setThreadingModel(osgViewer::Viewer::SingleThreaded);


        _mViewer->realize();


        




      }


 virtual void paintGL() {


    _mViewer->frame();


  }


int main(int argc, char** argv)


{


    QSurfaceFormat glFormat;


    glFormat.setVersion(3, 3);


    glFormat.setProfile(QSurfaceFormat::CoreProfile);


    glFormat.setSamples(4); //anti aliasing


    QSurfaceFormat::setDefaultFormat(glFormat);




    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);




    QApplication qapp(argc, argv);


    QMainWindow window;


    QtOSGWidget* widget = new QtOSGWidget(&window);




    window.setCentralWidget(widget);


    window.show();




    return qapp.exec();


}


When running directly through OpenSceneGraph i get the result i want, i 
post the code for clarity


    QSurfaceFormat glFormat;


    glFormat.setVersion(3, 3);


    glFormat.setProfile(QSurfaceFormat::CoreProfile);


    glFormat.setSamples(4); //anti aliasing


    QSurfaceFormat::setDefaultFormat(glFormat);




    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);




    osg::Group* root = new osg::Group;


    osgViewer::Viewer viewer;




    osg::Camera* camera = new osg::Camera;


    camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);


    camera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);


    camera->setViewMatrix(osg::Matrix::identity());




    camera->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);


    camera->setClearColor(osg::Vec4(1.0,1.0,1.0,1.0));


    camera->setClearMask(


    GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT


    );




    camera->setCullingMode(osg::CullStack::SMALL_FEATURE_CULLING);


    camera->addChild(root);


    osgText::Text* text = new osgText::Text();


    text->setText("ABRAKADABRA");


    text->setCharacterSize(14);


    text->setCharacterSizeMode(osgText::Text::CharacterSizeMode::SCREEN_COORDS);


    text->setAutoRotateToScreen(true);


    text->setColor(osg::Vec4(0, 0, 0, 1));


    text->setPosition(osg::Vec3(500,500,0));



    osg::Geode* drawableText = new osg::Geode;


    drawableText->addDrawable(text);


    root->addChild(drawableText);


    viewer.setThreadingModel(osgViewer::Viewer::SingleThreaded);


    viewer.setSceneData(camera);


    viewer.realize();


    return viewer.run();

Ange koden här...

The result can be compared in this image https://imgur.com/a/S7IsZs5. Now i 
have tried to fiddle with millions of parameters but i cannot understand 
how to solve this behaviour. Does anybody have an idea what causes it and 
how to prevent it?

I am relying on integration with Qt in my application so it is a necessity 
that it works together.
Thanks 

//Regards Dan

Den onsdag 20 november 2019 kl. 16:08:46 UTC+1 skrev Robert Osfield:
>
> Hi Dan,
>
> On Wed, 20 Nov 2019 at 14:54, Dan johansson <johans... at hotmail.com 
> <javascript:>> wrote:
>
>> I understand its difficult to help with such little information, 
>> unfortunately that is all there is so i cannot provide more code regarding 
>> this specific case. The osgtext example looks splendid, i copied and 
>> replaced my code with an example there and it now looks much cleaner. I'm 
>> still clueless as to what caused the issue. I can add i have built OSG with 
>> core profile and disabled the shader pipeline, but i am still wondering 
>> what actual renders the text as i haven't added a shader program to it in 
>> the way i would with a geode/geometry structure.
>>
>
> Are you using OSG from github master or the stable 3.6.x or other 
> release?  If you are using master I'd recommend using the latest 3.6.4 
> release as it doesn't include the experimental shader pipeline work.
>
> From 3.6.x onwards osgText provides it's own shaders so you don't need to 
> provide them yourself.  I can't provide any guesses as to what is wrong 
> with your original code, the best thing I can do is to recommend comparing 
> the example code to your own to see what differences there are.
>
> Cheers,
> Robert.
>

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