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#include "VecGeom/management/G4GeoManager.h"
#if defined(VECGEOM_GEANT4)
#include "G4GDMLParser.hh"
#include "G4GeometryManager.hh"
#include "G4VPhysicalVolume.hh"
#if defined(VECGEOM_ROOT)
// from VGM
#include "Geant4GM/volumes/Factory.h"
#include "RootGM/volumes/Factory.h"
// from ROOT
#include "TGeoManager.h"
#endif
namespace vecgeom {
inline namespace VECGEOM_IMPL_NAMESPACE {
G4GeoManager::G4GeoManager() : fNavigator(nullptr)
{
}
void G4GeoManager::LoadG4Geometry(std::string gdmlfile, bool validate)
{
G4GDMLParser parser;
parser.Read(gdmlfile, validate);
LoadG4Geometry(const_cast<G4VPhysicalVolume *>(parser.GetWorldVolume()));
}
// converts to a G4 geometry from ROOT using VGM
// expects a valid gGeoManager object for the import
// returns world pointer of in-memory representation
G4VPhysicalVolume *G4GeoManager::GetG4GeometryFromROOT()
{
G4VPhysicalVolume *world(nullptr);
#ifdef VECGEOM_ROOT
try {
RootGM::Factory rtFactory;
// rtFactory.SetDebug(1);
rtFactory.SetIgnore(true);
rtFactory.Import(gGeoManager->GetTopNode());
Geant4GM::Factory g4Factory;
// enable this to see debug output
// g4Factory.SetDebug(1);
// set to avoid crashes due to wrong material, etc. (which should
// not affect the geometry test
g4Factory.SetIgnore(true);
rtFactory.Export(&g4Factory);
world = g4Factory.World();
} catch (...) {
std::cerr << "caught exception in VGM; so return nullptr\n";
world = nullptr;
}
#else
// throw or put warning
#endif
return world;
}
// sets a G4 geometry from existing G4PhysicalVolume
void G4GeoManager::LoadG4Geometry(G4VPhysicalVolume *world)
{
// if there is an existing geometry
if (fNavigator != nullptr) delete fNavigator;
fNavigator = new G4Navigator();
fNavigator->SetWorldVolume(world);
// voxelize
G4GeometryManager::GetInstance()->CloseGeometry(fNavigator->GetWorldVolume());
}
}
} // end namespaces
#endif
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