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o2-sim: Possibility to switch between TGeo and Geant4 navigation #15077

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Merged
sawenzel merged 1 commit into from
Feb 18, 2026
+26 −1
Merged

o2-sim: Possibility to switch between TGeo and Geant4 navigation #15077

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9 changes: 9 additions & 0 deletions Common/SimConfig/include/SimConfig/G4Params.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,13 +33,22 @@ enum class EG4Physics {
kUSER = 8 /* allows to give own string combination */
};

// enumerating possible geometry navigation modes
// (understanding that geometry description is always done with TGeo)
enum class EG4Nav {
kTGeo = 0, /* navigate with TGeo */
kG4 = 1 /* navigate with G4 native geometry */
};

// parameters to influence the G4 engine
struct G4Params : public o2::conf::ConfigurableParamHelper<G4Params> {
EG4Physics physicsmode = EG4Physics::kFTFP_BERT_EMV_optical; // default physics mode with which to configure G4

std::string configMacroFile = ""; // a user provided g4Config.in file (otherwise standard one fill be taken)
std::string userPhysicsList = ""; // possibility to directly give physics list as string

EG4Nav navmode = EG4Nav::kTGeo; // geometry navigation mode (default TGeo)

std::string const& getPhysicsConfigString() const;

O2ParamDef(G4Params, "G4");
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1 change: 1 addition & 0 deletions Common/SimConfig/src/SimConfigLinkDef.h
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Expand Up @@ -29,6 +29,7 @@
#pragma link C++ class o2::conf::ConfigurableParamHelper < o2::conf::DigiParams> + ;

#pragma link C++ enum o2::conf::EG4Physics;
#pragma link C++ enum o2::conf::EG4Nav;
#pragma link C++ enum o2::conf::SimFieldMode;
#pragma link C++ struct o2::conf::G4Params + ;
#pragma link C++ class o2::conf::ConfigurableParamHelper < o2::conf::G4Params> + ;
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11 changes: 10 additions & 1 deletion Detectors/gconfig/g4Config.C
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Original file line number Diff line number Diff line change
@@ -1,13 +1,13 @@
/********************************************************************************
* Copyright (C) 2014 GSI Helmholtzzentrum fuer Schwerionenforschung GmbH *
* *
* This software is distributed under the terms of the *
* GNU Lesser General Public Licence version 3 (LGPL) version 3, *
* copied verbatim in the file "LICENSE" *
********************************************************************************/
R__LOAD_LIBRARY(libG4ptl)
R__LOAD_LIBRARY(libG4zlib)
R__LOAD_LIBRARY(libG4expat)

Check failure on line 10 in Detectors/gconfig/g4Config.C

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R__LOAD_LIBRARY(libG4clhep)
R__LOAD_LIBRARY(libG4tools)
R__LOAD_LIBRARY(libG4global)
Expand Down Expand Up @@ -100,7 +100,16 @@
auto& g4Params = ::o2::conf::G4Params::Instance();
auto& physicsSetup = g4Params.getPhysicsConfigString();
std::cout << "PhysicsSetup wanted " << physicsSetup << "\n";
auto runConfiguration = new TG4RunConfiguration("geomRoot", physicsSetup, "stepLimiter+specialCuts",
std::string geomNavStr;
if (g4Params.navmode == o2::conf::EG4Nav::kTGeo) {
geomNavStr = "geomRoot";
} else if (g4Params.navmode == o2::conf::EG4Nav::kG4) {
geomNavStr = "geomVMC+RootToGeant4";
} else {
LOG(fatal) << "Unsupported geometry navigation mode";
}

auto runConfiguration = new TG4RunConfiguration(geomNavStr, physicsSetup, "stepLimiter+specialCuts",
specialStacking, mtMode);
/// avoid the use of G4BACKTRACE (it seems to inferfere with process logic in o2-sim)
setenv("G4BACKTRACE", "none", 1);
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6 changes: 6 additions & 0 deletions Steer/src/O2MCApplication.cxx
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Expand Up @@ -42,6 +42,7 @@
#include <TGeoTessellated.h>
#include <DetectorsBase/O2Tessellated.h>
#include <unordered_set>
#include "SimConfig/G4Params.h"

namespace o2
{
Expand Down Expand Up @@ -223,6 +224,11 @@ bool O2MCApplicationBase::MisalignGeometry()

void O2MCApplicationBase::fixTGeoRuntimeShapes()
{
auto& g4Params = o2::conf::G4Params::Instance();
if (g4Params.navmode != o2::conf::EG4Nav::kTGeo) {
return;
}

// Replace TGeo shapes by other ones for performance or other reasons.
// Should only affect runtime of simulation.

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