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Hello Summit, This is the typical trap with the PostStepPoint : when arriving at the world boundary, the PostStepPoint volume (ie the one in which the next would go) is zero : there is no volume beyond the world volume. So your crash is due to the fact the GetPhysicalVolume() returns 0 , while your are calling GetName() on it. BTW, please let me remind you that a step always occurs in the PreStepPoint volume : if you use the PostStepPoint volume to assign whatever occured in the step, you would assign things to the wrong volume. Cheers, Marc Le 16/09/2011 14:57, Summit a écrit : > *** Discussion title: Geometry > > Hello Geant4experts, > > I tried to divide detector in tallies. In order to get fluence of > particle after tally, i included > > G4cout<<"Post Volume: > "<<step->GetPostStepPoint()->GetPhysicalVolume()->GetName()<<"\n"; > > but I am getting segmentation fault > > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > Post Volume: slice1 > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > Post Volume: Absorber > > Post Segmentation fault > > any suggestions please > > thanks > > Summit > > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1150.html