代码如下： //需要添加两个库：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> int main(int argc, char **argv) { osg::ArgumentParser arguments(&argc, argv); arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName()); arguments.getApplicationUsage()->setDescription(arguments.getApplicationName() + " is the standard 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."); bool helpAll = arguments.read("--help-all"); unsigned int helpType = ((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; } //添加一些操作器 osg::ref_ptr<osgGA::KeySwitchMatrixManipulator> keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator; keyswitchManipulator->addMatrixManipulator('1', "Trackball", new osgGA::TrackballManipulator()); keyswitchManipulator->addMatrixManipulator('2', "Flight", new osgGA::FlightManipulator()); keyswitchManipulator->addMatrixManipulator('3', "Drive", new osgGA::DriveManipulator()); keyswitchManipulator->addMatrixManipulator('4', "Terrain", new osgGA::TerrainManipulator()); std::string pathfile; char keyForAnimationPath = '5'; while (arguments.read("-p", pathfile)) { osgGA::AnimationPathManipulator *apm = new osgGA::AnimationPathManipulator(pathfile); if (apm || !apm->valid()) { unsigned int num = keyswitchManipulator->getNumMatrixManipulators(); keyswitchManipulator->addMatrixManipulator(keyForAnimationPath, "Path", apm); keyswitchManipulator->selectMatrixManipulator(num); ++keyForAnimationPath; } } viewer.setCameraManipulator(keyswitchManipulator.get()); //添加状态事件 viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet())); viewer.addEventHandler(new osgViewer::ThreadingHandler); //窗口大小变化事件 viewer.addEventHandler(new osgViewer::WindowSizeHandler); //添加一些常用状态设置 viewer.addEventHandler(new osgViewer::StatsHandler); viewer.addEventHandler(new osgViewer::HelpHandler(arguments.getApplicationUsage())); viewer.addEventHandler(new osgViewer::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(); }
吐槽一下作者，作为新手教程，搞这些乱七八糟的东西有什么用呢？
这个例子相比3.0版本，唯一的新东西就是有个模型优化。