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I declared a Ntuple/TTree in RunAction with braches: EventNumber, hitX, hitY and hitZ. Then I recorded these parameters of each scintillation photon when it got absorbed on a surface. I did this in two different ways, using AnalysisManager and explicitly declaring the TTree. Both methods led to crash saying I deleted volumes before some geometry(?). Please refer to the attached files, thank you very much for help!
Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/11/08/16.14-99797-N01SteppingAction.cc.txt http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/11/08/16.14-59366-N01SteppingAction.hh.txt