Commented out the selection of the animation path manipulator since it

was somehow disabling culling?!?

src/Demos/sgv/sgv.cpp

@@ -152,7 +152,10 @@ int main( int argc, char **argv )
 	if( apm->valid() ) 
         {
             unsigned int no = viewer.registerCameraManipulator(apm);
-            viewer.selectCameraManipulator(no);
+            // selecting the animation path manipulator up front seems to disable view frustum 
+            // in a heavy duty way that I'm do understand yet, so I'm commenting out for the
+            // time being.  Simply pressing '4' will get you the animation path working correctly.
+            //viewer.selectCameraManipulator(no);
         }
 	else
 	    delete apm;