g4Config.C

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/********************************************************************************
 *    Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH    *
 *                                                                              *
 *              This software is distributed under the terms of the             *
 *              GNU Lesser General Public Licence (LGPL) version 3,             *
 *                  copied verbatim in the file "LICENSE"                       *
 ********************************************************************************/
// Configuration macro for Geant4 VirtualMC
void Config()
{

    Bool_t mtMode = FairRunSim::Instance()->IsMT();
    Bool_t specialStacking = false;
    TG4RunConfiguration* runConfiguration = new TG4RunConfiguration(
        "geomRoot", "QGSP_BERT_EMV", "stepLimiter+specialCuts+specialControls", specialStacking, mtMode);

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

    FairStack* stack = new FairStack(1000);
    stack->StoreSecondaries(kTRUE);
    stack->SetMinPoints(0);
    geant4->SetStack(stack);

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


    TString configm(gSystem->Getenv("CONFIG_DIR"));
    TString configm1 = configm + "/g4config.in";
    cout << " -I g4Config() using g4conf  macro: " << configm1 << endl;

    // set geant4 specific stuff
    geant4->SetMaxNStep(10000);   // default is 30000
    geant4->ProcessGeantMacro(configm1.Data());
}