Step by step addDrawable and visualize current scene graph

[Paul Jurczak]

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?

[Nathan Mielcarek]

Paul,

Looking at the OSG Viewer.cpp code, the run() function contains this code:

    if (!getCameraManipulator() && getCamera()->getAllowEventFocus())

    {
        setCameraManipulator(new osgGA::TrackballManipulator());
    }

Therefore, by adding this line before viewer.frame() is called makes the spheres appear as you expected:

    viewer.setCameraManipulator(new osgGA::TrackballManipulator());

-Nathan

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[Paul Jurczak]

Thank you, Nathan. It solves my problem.