Began work on providing support for threading camera cull traversals in parallel with

the previous frames draw traversal.  Changes range from osg::State, through osgUtil::RenderBin, through to osgViewer

src/osg/Drawable.cpp

@@ -246,6 +246,8 @@ void Drawable::flushDeletedVertexBufferObjects(unsigned int contextID,double /*c
 
 Drawable::Drawable()
 {
+    setDataVariance(osg::Object::STATIC);
+
     _boundingBoxComputed = false;
 
     // Note, if your are defining a subclass from drawable which is

src/osg/State.cpp

@@ -53,6 +53,8 @@ State::State()
     _glVertexAttribPointer = 0;
     _glEnableVertexAttribArray = 0;
     _glDisableVertexAttribArray = 0;
+
+    _dynamicObjectCount  = 0;
 }
 
 State::~State()

src/osg/StateSet.cpp

@@ -80,7 +80,7 @@ bool osg::isTextureMode(StateAttribute::GLMode mode)
 
 StateSet::StateSet()
 {
-    setDataVariance(osg::StateAttribute::STATIC);
+    setDataVariance(osg::Object::STATIC);
 
     _renderingHint = DEFAULT_BIN;