Added GeometryTechinque to osgTerrain. Added usage of GeometryTechnique into osgterrain example

Added --width and --height command line options to osgdistortion to allow users
to control the window size.

src/osgTerrain/GeometryTechnique.cpp

@@ -0,0 +1,56 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgTerrain/GeometryTechnique>
+
+using namespace osgTerrain;
+
+GeometryTechnique::GeometryTechnique()
+{
+}
+
+GeometryTechnique::GeometryTechnique(const GeometryTechnique& gt,const osg::CopyOp& copyop):
+    TerrainTechnique(gt,copyop)
+{
+}
+
+GeometryTechnique::~GeometryTechnique()
+{
+}
+
+void GeometryTechnique::initialize()
+{
+    osg::notify(osg::NOTICE)<<"Doing initalize"<<std::endl;
+    
+    _geode = new osg::Geode;
+    _geometry = new osg::Geometry;
+    _geode->addDrawable(_geometry.get());
+    
+}
+
+
+void GeometryTechnique::update(osgUtil::UpdateVisitor* nv)
+{
+    osg::notify(osg::NOTICE)<<"Doing update"<<std::endl;
+}
+
+
+void GeometryTechnique::cull(osgUtil::CullVisitor* nv)
+{
+    osg::notify(osg::NOTICE)<<"Doing cull"<<std::endl;
+    
+    if (_geode.valid())
+    {
+        _geode->accept(*nv);
+    }
+}