Description:   osg tile TilePagedLOD* plod = new TilePagedLOD( _engineUID, _liveTiles, _deadTiles ); plod->setCenter ( bs.center() ); plod->addChild ( tileNode ); plod->setFileName( 1, Stringify() << tileNode->getKey().str() << "." << _engineUID << ".osgearth_engine_mp_tile" );