Moved the init traversal from cull() to the draw() to prevent graphics context

calls being made during the cull traversal - something that breaks the
ThreadPerCamera model in osgViewer

src/osgUtil/SceneView.cpp

@@ -633,9 +633,6 @@ void SceneView::cullStage(const osg::Matrixd& projection,const osg::Matrixd& mod
 
     if (!_camera || !getViewport()) return;
 
-    if (!_initCalled) init();
-
-
     osg::ref_ptr<RefMatrix> proj = new osg::RefMatrix(projection);
     osg::ref_ptr<RefMatrix> mv = new osg::RefMatrix(modelview);
 
@@ -841,6 +838,8 @@ void SceneView::draw()
 {
     if (_camera->getNodeMask()==0) return;
 
+    if (!_initCalled) init();
+
     osg::State* state = _renderInfo.getState();
 
     // note, to support multi-pipe systems the deletion of OpenGL display list