g4Config_Cherenkov.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("/mcVerbose/all 0"); 
  geant4->ProcessGeantCommand("/mcVerbose/eventAction 1");
  
  // geant4->ProcessGeantCommand("/optics_engine/selectOpProcess Cerenkov");
  // geant4->ProcessGeantCommand("/optics_engine/setTrackSecondariesFirst false"); 
  // geant4->ProcessGeantCommand("/optics_engine/setCerenkovMaxPhotons 5");
  // geant4->ProcessGeantCommand("/optics_engine/setCerenkovMaxBetaChange 0.1");
  
  PndStack *stack = new PndStack(1000); 
  //stack->StoreSecondaries(kFALSE); //default is kTRUE
  stack->SetMinPoints(2);
  geant4->SetStack(stack);

  if(FairRunSim::Instance()->IsExtDecayer()){
    TVirtualMCDecayer* decayer = TPythia6Decayer::Instance();
    geant4->SetExternalDecayer(decayer);
  }
  
  geant4->SetMaxNStep(10000);  // default is 30000

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