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

VisualizationExample 8.1. Part of a sample .cshrc setup file for the Linux platform.############################################################# Main Environment Variables for GEANT4 with Visualization ################################################################ Platformsetenv G4SYSTEM Linux-g++### CLHEP base directorysetenv CLHEP_BASE_DIR /opt/local### OpenGL base directorysetenv OGLHOME /usr/X11R6### G4VIS_BUILD### Incorporation of OpenGL-Xlib and OpenGL-Motif drivers### into Geant4 libraries.setenv G4VIS_BUILD_OPENGLX_DRIVER 1setenv G4VIS_BUILD_OPENGLXM_DRIVER 1### G4VIS_USE### Incorporation of OpenGL-Xlib and OpenGL-Motif drivers### into Geant4 executables.setenv G4VIS_USE_OPENGLX 1setenv G4VIS_USE_OPENGLXM 1### Viewer for DAWNFILE driver### Default value is "dawn". You can change it to, say,### "david" for volume overlapping tests# setenv G4DAWNFILE_VIEWER david### Viewer for VRMLFILE driverssetenv G4VRMLFILE_VIEWER vrmlview########## end8.2.4. Visualization ManagerVisualization procedures are controlled by the "Visualization Manager", a class which must inherit fromG4VisManager defined in the visualization category. Most users will find that they can just use the default visualizationmanager, G4VisExecutive. The Visualization Manager accepts users' requests for visualization, processesthem, and passes the processed requirements to the abstract interface, i.e., to the currently selected visualizationdriver.8.2.5. How to Write the main() FunctionIn order for your Geant4 executable to perform visualization, you must instantiate and initialize "your" VisualizationManager in the main() function. The core of the Visualization Manager is the class G4VisManager,defined in the visualization category. This class requires that one pure virtual function be implemented, namely,void RegisterGraphicsSystems(). The easiest way to do this is to use G4VisExecutive, as describedabove (but you may write your own class - see above).Example 8.2 shows the form of the main() function.219