[osg-users] Step by step addDrawable and visualize current scene graph

['Paul Jurczak' via OpenSceneGraph Users]

I'm just starting with OSG. I would like this (or similar) code: 

    int main() {
      osgViewer::Viewer viewer;
      osg::Geode*       geode = new osg::Geode();
    
      viewer.setSceneData(geode);
      geode->addDrawable(new osg::ShapeDrawable(new 
osg::Sphere(osg::Vec3(0, 0, 0), 1)));
    
      viewer.frame();
      this_thread::sleep_for(seconds(2));
    
      geode->addDrawable(new osg::ShapeDrawable(new 
osg::Sphere(osg::Vec3(2, 0, 0), 1)));
      
      return viewer.run();
    }

to display the first sphere and after 2s the second sphere, but it displays 
a blank screen for 2s instead and 2 spheres afterwards. What do I have to 
change?

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