The VecGeom and G4VecGeomNavigator class

Dear professor:

I try to using the vecgeom to navigate the transportion of particle but i could not find the class: G4VecGeomNavigator , the code only include the TG4VecGeomNavigator.h

// make the G4VecGeomNavigator
auto nav = new G4VecGeomNavigator(g4geometry);

// hooking the navigator into G4
auto trMgr = G4TransportationManager::GetTransportationManager();

trMgr->SetNavigatorForTracking(nav)