[Opensg-users] How to use StereoBufferViewport

[Jörn T. <joe...@un...>]

Hello everybody,

I have a seemingly simple problem with OpenSG 1.8 (yes, I have to use 
that version...) which I don't know how to solve:
I want to use a zSpace Monitor to render in 3D, so I need quad buffered 
stereo. No problem I thought, just use the StereoBufferedViewport with a 
Camera with two ShearedStereoCameraDecorator. But it does give me any 
3D. I still only get a 2D version of my scene even though the monitor is 
clearly in 3D mode. I can even disable one of the buffers of the 
Viewport to get a nice flickering window. What did I miss here?

Now a snippet of the relevant code I use (the original got some calls to 
the zSpace API, but I don't think they matter here):

initialisation:
[...]

     m_pCamera = osg::PerspectiveCamera::create();
     osg::beginEditCP(m_pCamera);
         m_pCamera->setBeacon(m_pCamBeacon);
         m_pCamera->setFov(osg::deg2rad(60));
         m_pCamera->setNear(0.1);
         m_pCamera->setFar(100);
     osg::endEditCP(m_pCamera);

     osg::ShearedStereoCameraDecoratorPtr cameraDecoratorLeft, 
cameraDecoratorRight;

         cameraDecoratorLeft = osg::ShearedStereoCameraDecorator::create();
         osg::beginEditCP(cameraDecoratorLeft);
             cameraDecoratorLeft->setLeftEye(true);
             cameraDecoratorLeft->setEyeSeparation( fEyeSeperation );
             cameraDecoratorLeft->setDecoratee(m_pCamera);
             cameraDecoratorLeft->setZeroParallaxDistance( 
fZeroParallaxDist );
         osg::endEditCP(cameraDecoratorLeft);

         cameraDecoratorRight = osg::ShearedStereoCameraDecorator::create();
         osg::beginEditCP(cameraDecoratorRight);
             cameraDecoratorRight->setLeftEye(false);
             cameraDecoratorRight->setEyeSeparation( fEyeSeperation );
             cameraDecoratorRight->setDecoratee(m_pCamera);
             cameraDecoratorRight->setZeroParallaxDistance( 
fZeroParallaxDist );
         osg::endEditCP(cameraDecoratorRight);

         m_pViewport = osg::StereoBufferViewport::create();

      osg::beginEditCP(m_pViewport);
         m_pViewportLeft->setCamera( m_pCamera );
         m_pViewportLeft->setBackground( background );
         m_pViewportLeft->setRoot(pRoot);
         m_pViewportLeft->setSize(0,0,1,1);
     osg::endEditCP(m_pViewport);

     m_pWindow = osg::GLUTWindow::create();
     osg::beginEditCP(m_pWindow);
         m_pWindow->setId(winid);
         m_pWindow->addPort(m_pViewport);
         m_pWindow->setSize( m_iWindowWidth, m_iWindowHeight);
         m_pWindow->init();
     osg::endEditCP(m_pWindow);


rendering: a simple
void render( osg::RenderAction* pRenderAction )
{
     m_pWindow->render( pRenderAction );
}

Thank you so much for any help with this!
Best regards
Jörn Teuber