Geant4 User's Guide for Application Developers - Geant4 - CERN

VisualizationExample 8.2. The form of the main() function.//----- C++ source codes: Instantiation and initialization of G4VisManager.....// Your Visualization Manager#include "G4VisExecutive.hh".....// Instantiation and initialization of the Visualization Manager#ifdef G4VIS_USEG4VisManager* visManager = new G4VisExecutive;visManager -> initialize ();#endif.....#ifdef G4VIS_USEdelete visManager;#endif//----- end of C++Alternatively, you can implement an empty RegisterGraphicsSystems() function, and register visualizationdrivers you want directly in your main() function. See Example 8.3.Example 8.3. An alternative style for the main() function.//----- C++ source codes: How to register a visualization driver directly// in main() function.....G4VisManager* visManager = new G4VisExecutive;visManager -> RegisterGraphicsSystem (new MyGraphicsSystem);.....delete visManager//----- end of C++Do not forget to delete the instantiated Visualization Manager by yourself. Note that a graphics system for Geant4Visualization may run as a different process. In that case, the destructor of G4VisManager might have to terminatethe graphics system and/or close the connection.We recommend that the instantiation, initialization, and deletion of the Visualization Manager be protected by C-pre-processor commands, as in the novice examples. The C-pre-processor macro G4VIS_USE is automaticallydefined unless the environment variable G4VIS_NONE is set. This assumes that you are compiling your Geant4executable with the standard version of GNUmakefile found in the config directory.Example 8.4 shows an example of the main() function available for Geant4 Visualization.220