title: OpenSceneGraph Sphere Geometry (not Geode) generation
body: <p>I am very bad at OSG. I can make Sphere with Geode.
  My task is create OSG::Geometry Sphere with Vertex and Normals. Can anybody help me?</p>
  
  <p>So not this way: </p>
  
  <p>osg::Sphere* sphere = new osg::Sphere( osg::Vec3(0,0,0), 1.0);</p>