+ // traverse the potentially viewable tile list and update range
+ // selector and transform
+
+ // just setup and call new function...
+
+ sgVec3 up;
+ sgCopyVec3( up, globals->get_current_view()->get_world_up() );
+
+ Point3D center;
+ center = globals->get_scenery()->get_center();
+ prep_ssg_nodes( vis, up, center );
+
+}
+
+void FGTileMgr::prep_ssg_nodes(float vis, sgVec3 up, Point3D center) {