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

[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


On Sun, Mar 21, 2021 at 5:31 PM 'Paul Jurczak' via OpenSceneGraph Users <
osg-users at googlegroups.com> wrote:

> 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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