Test gdml output

Simulation/G4Faser/G4FaserAlg/src/G4FaserAlg.cxx

@@ -30,6 +30,9 @@
 #include "G4VModularPhysicsList.hh"
 #include "G4ParallelWorldPhysics.hh"
 
+#include "G4LogicalVolumeStore.hh"
+#include "G4GDMLParser.hh"
+
 // CLHEP includes
 #include "CLHEP/Random/RandomEngine.h"
 
@@ -198,6 +201,12 @@ void G4FaserAlg::initializeOnce()
     throw std::runtime_error("Could not initialize ATLAS UserLimitsSvc!");
   }
 
+  G4LogicalVolumeStore* store = G4LogicalVolumeStore::GetInstance();
+  G4LogicalVolume* world = store->GetVolume("Faser::Faser");
+  G4GDMLParser parser {};
+  parser.Write("Faser.gdml", world);
+  ATH_MSG_ALWAYS("Wrote detector geometry to GDML file");
+
   if (m_activateParallelGeometries) {
     G4VModularPhysicsList* thePhysicsList=dynamic_cast<G4VModularPhysicsList*>(m_physListSvc->GetPhysicsList());
     if (!thePhysicsList) {