g4Config_opt.C

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// Configuration macro for Geant4 VirtualMC
void Config()
{

   TG4RunConfiguration* runConfiguration 
           = new TG4RunConfiguration("geomRoot", "QGSP_BERT_EMV+optical", "stepLimiter+specialCuts+specialControls");

   TGeant4* geant4 = new TGeant4("TGeant4", "The Geant4 Monte Carlo", runConfiguration);
   cout << "Geant4 has been created." << endl;

  geant4->ProcessGeantCommand("/optics_engine/selectOpProcess Cerenkov");
  geant4->ProcessGeantCommand("/optics_engine/setTrackSecondariesFirst false");

   PndStack *stack = new PndStack(1000); 
   stack->StoreSecondaries(kTRUE);
   stack->SetMinPoints(2);
   geant4->SetStack(stack);

   if(FairRunSim::Instance()->IsExtDecayer()){
      TVirtualMCDecayer* decayer = TPythia6Decayer::Instance();
      geant4->SetExternalDecayer(decayer);
   }
  

   TString configm(gSystem->Getenv("VMCWORKDIR"));
   configm = configm + "/gconfig/g4config.in";
   cout << " -I g4Config() using g4conf  macro: " << configm << endl;

     //set geant4 specific stuff
   geant4->SetMaxNStep(10000);  // default is 30000

  Text_t buffer[50];
  sprintf(buffer,"/random/setSeeds %i  %i ",gRandom->GetSeed(), gRandom->GetSeed());
  geant4->ProcessGeantCommand(buffer);
 
  geant4->ProcessGeantMacro(configm.Data());


}