SceneGraph for Qt3D in C++

I want to make a scenegraph with 3D primitive objects in C++ and OpenGL. I’m new to Qt, can I use QGLAbstractScene and programatically add a bunch of object on the fly to QGLSceneNode. I can’t find any examples of 3D C++ scenegraphs in Qt anywhere. I’m confused by the documentation which covers 2D Scenegraphs and Qt Quick Scenegraphs, but I don’t want to use QML and I don’t want to just do 2D graphics. If I can avoid another learning curve with Open Scenegraph, that would also help! Thanks, Fireking.