diff --git a/include/osgTerrain/TerrainNode b/include/osgTerrain/TerrainNode
index ba59756c6..25f6b19eb 100644
--- a/include/osgTerrain/TerrainNode
+++ b/include/osgTerrain/TerrainNode
@@ -121,6 +121,23 @@ class OSGTERRAIN_EXPORT TerrainNode : public osg::Group
         bool getTreatBoundariesToValidDataAsDefaultValue() const { return _treatBoundariesToValidDataAsDefaultValue; }
 
 
+        /** Set an OperationsThread to do an data initialization and update work.*/
+        void setOperationsThread(osg::OperationsThread* operationsThread) { _operationsThread = operationsThread; }
+
+        /** Get the OperationsThread if one is attached, return NULL otherwise.*/
+        osg::OperationsThread* getOperationsThread() { return _operationsThread.get(); }
+
+        /** Get the const OperationsThread if one is attached, return NULL otherwise.*/
+        const osg::OperationsThread* getOperationsThread() const { return _operationsThread.get(); }
+
+
+        /** Add a graphics context that should be used to compile/delete OpenGL objects.*/
+        void addCompileGraphicsContext(osg::GraphicsContext* gc);
+        
+        /** Removed a graphics context that should be used to compile/delete OpenGL objects.*/
+        void removeCompileGraphicsContext(osg::GraphicsContext* gc);
+
+
         /** Compute the bounding volume of the terrain by computing the union of the bounding volumes of all layers.*/
         virtual osg::BoundingSphere computeBound() const;
 
@@ -162,6 +179,11 @@ class OSGTERRAIN_EXPORT TerrainNode : public osg::Group
         
         bool                                _requiresNormals;
         bool                                _treatBoundariesToValidDataAsDefaultValue;
+
+        osg::ref_ptr<osg::OperationsThread> _operationsThread;
+
+        typedef std::vector< osg::observer_ptr<osg::GraphicsContext> >  CompileGraphicsContexts;
+        CompileGraphicsContexts             _compileGraphicsContexts;
 };
 
 }
diff --git a/src/osgTerrain/GeometryTechnique.cpp b/src/osgTerrain/GeometryTechnique.cpp
index f83a8a4f7..eab716378 100644
--- a/src/osgTerrain/GeometryTechnique.cpp
+++ b/src/osgTerrain/GeometryTechnique.cpp
@@ -531,18 +531,22 @@ void GeometryTechnique::init()
 }
 
 
-void GeometryTechnique::update(osgUtil::UpdateVisitor* nv)
+void GeometryTechnique::update(osgUtil::UpdateVisitor* uv)
 {
-    
+    if (_terrainNode) _terrainNode->osg::Group::traverse(*uv);
 }
 
 
-void GeometryTechnique::cull(osgUtil::CullVisitor* nv)
+void GeometryTechnique::cull(osgUtil::CullVisitor* cv)
 {
+#if 0
+    if (_terrainNode) _terrainNode->osg::Group::traverse(*cv);
+#else
     if (_transform.valid())
     {
-        _transform->accept(*nv);
+        _transform->accept(*cv);
     }
+#endif    
 }
 
 void GeometryTechnique::cleanSceneGraph()
diff --git a/src/osgTerrain/TerrainNode.cpp b/src/osgTerrain/TerrainNode.cpp
index 11f7d62ee..4ccecfbaa 100644
--- a/src/osgTerrain/TerrainNode.cpp
+++ b/src/osgTerrain/TerrainNode.cpp
@@ -99,6 +99,36 @@ void TerrainNode::setColorFilter(unsigned int i, Filter filter)
     _colorLayers[i].filter = filter;
 }
 
+void TerrainNode::addCompileGraphicsContext(osg::GraphicsContext* gc)
+{
+    for(CompileGraphicsContexts::iterator itr = _compileGraphicsContexts.begin();
+        itr != _compileGraphicsContexts.end();
+        ++itr)
+    {
+        if (*itr == gc)
+        {
+            return;
+        }
+    }
+    
+    _compileGraphicsContexts.push_back(gc);
+}
+
+void TerrainNode::removeCompileGraphicsContext(osg::GraphicsContext* gc)
+{
+    for(CompileGraphicsContexts::iterator itr = _compileGraphicsContexts.begin();
+        itr != _compileGraphicsContexts.end();
+        ++itr)
+    {
+        if (*itr == gc)
+        {
+            _compileGraphicsContexts.erase(itr);
+            return;
+        }
+    }
+}
+
+
 osg::BoundingSphere TerrainNode::computeBound() const
 {
     osg::BoundingSphere bs;
diff --git a/src/osgTerrain/TerrainTechnique.cpp b/src/osgTerrain/TerrainTechnique.cpp
index bc3481540..8c0536222 100644
--- a/src/osgTerrain/TerrainTechnique.cpp
+++ b/src/osgTerrain/TerrainTechnique.cpp
@@ -40,14 +40,16 @@ void TerrainTechnique::init()
     _dirty = false;
 }
 
-void TerrainTechnique::update(osgUtil::UpdateVisitor*)
+void TerrainTechnique::update(osgUtil::UpdateVisitor* uv)
 {
     osg::notify(osg::NOTICE)<<className()<<"::update(..) not implementated yet"<<std::endl;
+    if (_terrainNode) _terrainNode->osg::Group::traverse(*uv);
 }
 
-void TerrainTechnique::cull(osgUtil::CullVisitor*)
+void TerrainTechnique::cull(osgUtil::CullVisitor* cv)
 {
     osg::notify(osg::NOTICE)<<className()<<"::cull(..) not implementated yet"<<std::endl;
+    if (_terrainNode) _terrainNode->osg::Group::traverse(*cv);
 }
 
 void TerrainTechnique::cleanSceneGraph()