Added update traversal to run prior to doing kdtree build to make sure that

costs in build osgTerrain databases isn't incurred during the build traversal.

examples/osgkdtree/osgkdtree.cpp

@@ -32,6 +32,7 @@
 
 #include <osgUtil/IntersectionVisitor>
 #include <osgUtil/LineSegmentIntersector>
+#include <osgUtil/UpdateVisitor>
 
 #include <osgSim/LineOfSight>
 #include <osgSim/HeightAboveTerrain>
@@ -485,6 +486,10 @@ int main(int argc, char **argv)
     }
 
 
+    osgUtil::UpdateVisitor updateVisitor;
+    scene->accept(updateVisitor);
+
+
     osg::Timer_t start = osg::Timer::instance()->tick();
     
     osg::KDTreeBuilder builder;