OSG Programming's Hello World 4.0

The code is as follows://need to add two libraries: OsgUtild.lib, OsgTextd.lib

#include <osgDB/ReadFile>#include<osgUtil/Optimizer>#include<osg/CoordinateSystemNode>#include<osg/Switch>#include<osgText/Text>#include<osgViewer/Viewer>#include<osgViewer/ViewerEventHandlers>#include<osgGA/TrackballManipulator>#include<osgGA/FlightManipulator>#include<osgGA/DriveManipulator>#include<osgGA/KeySwitchMatrixManipulator>#include<osgGA/StateSetManipulator>#include<osgGA/AnimationPathManipulator>#include<osgGA/TerrainManipulator>#include<iostream>intMainintargcChar**argv) {Osg::argumentparser arguments (&argc, argv); Arguments.getapplicationusage ()-Setapplicationname (Arguments.getapplicationname ()); Arguments.getapplicationusage ()->setdescription (Arguments.getapplicationname () +"Is the openscenegraph example which loads and visualises 3d models."); Arguments.getapplicationusage ()->setcommandlineusage (Arguments.getapplicationname () +"[options] filename ..."); Arguments.getapplicationusage ()->addcommandlineoption ("--image <filename>","Load an image and render it on quad"); Arguments.getapplicationusage ()->addcommandlineoption ("--dem <filename>","Load an Image/dem and render it on a Heightfield"); Arguments.getapplicationusage ()->addcommandlineoption ("- H or-help","Display command Line Parameters"); Arguments.getapplicationusage ()->addcommandlineoption ("--help-env","Display Environmental variables available"); Arguments.getapplicationusage ()->addcommandlineoption ("--help-keys","Display keyboard & mouse bindings available"); Arguments.getapplicationusage ()->addcommandlineoption ("--help-all","Display command line, env VARs and keyboard & mouse bindings."); Arguments.getapplicationusage ()->addcommandlineoption ("--singlethreaded","Select singlethreaded threading Model for viewer."); Arguments.getapplicationusage ()->addcommandlineoption ("-culldrawthreadpercontext",         "Select culldrawthreadpercontext threading Model for viewer."); Arguments.getapplicationusage ()->addcommandlineoption ("--drawthreadpercontext",         "Select drawthreadpercontext threading Model for viewer."); Arguments.getapplicationusage ()->addcommandlineoption ("--cullthreadpercameradrawthreadpercontext",        "Select cullthreadpercameradrawthreadpercontext threading Model for viewer."); BOOLHelpall = Arguments.read ("--help-all"); unsignedintHelptype = ((Helpall | | | arguments.read ("- H") || Arguments.read ("--help")) ?osg::applicationusage::command_line_option:0) |((Helpall|| Arguments.read ("--help-env")) ?osg::applicationusage::environmental_variable:0) |((Helpall|| Arguments.read ("--help-keys")) ?osg::applicationusage::keyboard_mouse_binding:0); if(Helptype) {arguments.getapplicationusage ()-Write (std::cout, helptype); return 1;    } osgviewer::viewer Viewer (arguments); if(Arguments.errors ()) {arguments.writeerrormessages (std::cout); return 1; }    if(ARGUMENTS.ARGC () <=1) {arguments.getapplicationusage ()-Write (std::cout, osg::applicationusage::command_line_option); return 1; }        //Add some operatorsOsg::ref_ptr<osgga::keyswitchmatrixmanipulator> Keyswitchmanipulator =NewOsgga::keyswitchmatrixmanipulator; Keyswitchmanipulator->addmatrixmanipulator ('1',"trackball",Newosgga::trackballmanipulator ()); Keyswitchmanipulator->addmatrixmanipulator ('2',"Flight",Newosgga::flightmanipulator ()); Keyswitchmanipulator->addmatrixmanipulator ('3'," Drive",NewOsgga::D rivemanipulator ()); Keyswitchmanipulator->addmatrixmanipulator ('4',"Terrain",Newosgga::terrainmanipulator ()); STD::stringPathfile; CharKeyforanimationpath ='5';  while(Arguments.read ("- P", Pathfile)) {Osgga::animationpathmanipulator*APM =NewOsgga::animationpathmanipulator (Pathfile); if(APM | |!apm->valid ()) {unsignedintnum = keyswitchmanipulator->getnummatrixmanipulators (); Keyswitchmanipulator->addmatrixmanipulator (Keyforanimationpath,"Path", APM); Keyswitchmanipulator-selectmatrixmanipulator (num); ++Keyforanimationpath; }} viewer.setcameramanipulator (Keyswitchmanipulator.Get()); //Adding status EventsViewer.addeventhandler (NewOsgga::statesetmanipulator (Viewer.getcamera ()Getorcreatestateset ())); Viewer.addeventhandler (NewOsgviewer::threadinghandler); //Window Size Change EventViewer.addeventhandler (NewOsgviewer::windowsizehandler); //add some common state settingsViewer.addeventhandler (NewOsgviewer::statshandler); Viewer.addeventhandler (NewOsgviewer::helphandler (Arguments.getapplicationusage ())); Viewer.addeventhandler (NewOsgviewer::recordcamerapathhandler); Osg::ref_ptr<osg::Node> Loadedmodel =osgdb::readnodefiles (arguments); if(!Loadedmodel) {Std::cout<<arguments.getapplicationname () <<": No Data loaded"<<Std::endl; return 1;    } arguments.reportremainingoptionsasunrecognized (); if(Arguments.errors ()) {arguments.writeerrormessages (std::cout); return 1;    } Osgutil::optimizer Optimizer; Optimizer.optimize (Loadedmodel.Get()); Viewer.setscenedata (Loadedmodel.Get());    Viewer.realize (); Viewer.run ();}

Spit it out. The author, as a beginner's tutorial, what's the use of doing this mess?

This example compares to the 3.0 version, the only new thing is to have a model optimization.

OSG Programming's Hello World 4.0