multi geometry

include/ActionInitialization.hh

@@ -62,6 +62,10 @@ class ActionInitialization : public G4VUserActionInitialization
         G4cout << "ActionInitialization: Setting particle species to " << partSpecies << G4endl;
     }
 
+    void setDetectorConstruction(B4::DetectorConstruction* det){
+      fDetConstruction = det;
+    }
+
   private:
     B4::DetectorConstruction* fDetConstruction = nullptr;
     mutable B4::PrimaryGeneratorAction * gen = nullptr;