This macro displays the output of various event generators. The input is selected by true/false switches. It is set to pythia6 as default. If HepMC files or EIC TTree file input is selected the filename has to be given as second argument. By default the first event is displayed. The visualization macro contains a bunch of commented out options you may play with (after reading the GEANT4 docs). Usage:
root.exe
.x Fun4All_Generator_Display.C()