[osg-users] Horizontal-Interlaced-Stereo not working when integrated in Qt

[OpenSceneGraph Users]

Hi all,

I have a problem when trying to use the stereo mode HORIZONTAL_INTELACE 
with a viewer that is integrated into Qt utilizing the QOpenGLWidget: It 
doesn't work.

My integrated viewer class subclasses QOpenGLWidget as well as the 
osgViewer::Viewer. 

In my initialization routine I create a graphic context like this:

osg::DisplaySettings::instance()->setNumMultiSamples(DEFAULT_MULTISAMPLING);


osg::ref_ptr<osg::GraphicsContext::Traits> pTraits = new osg::GraphicsContext::Traits;

pTraits->x = 0;

pTraits->y = 0;

pTraits->width = DEFAULT_SCREEN_WIDTH;

pTraits->height = DEFAULT_SCREEN_HEIGHT;

pTraits->doubleBuffer = true;  
pTraits->stencil = 8;


mpGraphicsWindowEmbeddedContext = new

      osgViewer::GraphicsWindowEmbedded(pTraits.get());


I use this graphics content and set it to the render camera:

mpRenderCamera->setGraphicsContext(mpGraphicsWindowEmbeddedContext);

mpRenderCamera->setViewport(0, 0, DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT);

mpRenderCamera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);

mpRenderCamera->setClearColor(osg::Vec4(DEFAULT_BG_COLOR_R, DEFAULT_BG_COLOR_G, DEFAULT_BG_COLOR_B,

                                   DEFAULT_BG_COLOR_A));


For my QOpenGLWidget I have set my QSurfaceFormat like this: 

QSurfaceFormat format(QSurfaceFormat::defaultFormat());

format.setSamples(DEFAULT_MULTISAMPLING);

format.setStencilBufferSize(8);

setFormat(format);


When I run my code I only see the image for the left eye without any 
interlacing by the image for the right eye.

I also tried the viewer from https://github.com/openscenegraph/osgQt but it 
gives me the same result.

I suppose it has something to to with the stencil buffer, but I don't know 
how to fix it. Can someone please help me? 

Thanks in advance.

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