From Jean-Sebastien Guay and Robert Osfiled, osgViewer::ScreenCaptureHandler for

taking screenshots

applications/osgviewer/osgviewer.cpp

@@ -109,6 +109,9 @@ int main(int argc, char** argv)
     // add the LOD Scale handler
     viewer.addEventHandler(new osgViewer::LODScaleHandler);
 
+    // add the LOD Scale handler
+    viewer.addEventHandler(new osgViewer::ScreenCaptureHandler);
+
     // load the data
     osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
     if (!loadedModel)