OpenSceneGraph 3.0

Time for action—saving the log file

We will make use of the std::ofstream class to redirect the OSG internal notify messages to an external log file. The virtual function notify() of the osg::NotifyHandler derived class should be overridden to apply standard file stream operations, and a global function osg::setNotifyHandler() is called before everything starts as well.

1. Include the necessary headers:

   #include <osgDB/ReadFile>
   #include <osgViewer/Viewer>
   #include <fstream>

2. Implement the derived class LogFileHandler, which will redirect notify messages to the file stream:

   class LogFileHandler : public osg::NotifyHandler { public: LogFileHandler( const std::string& file ) { _log.open( file.c_str() ); } virtual ~LogFileHandler() { _log.close(); } virtual ...