|Message: Re: Purpose of managing the stacks||Not Logged In (login)|
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Hi, For an example of StackingAction "in action" see ExN04. Here are some legitimate and useful reasons for using StackingAction: 1) Simulate the background from "looper" particles in a detector by postponing them until the next event. 2) Kill or wait on tracks you don't care much about (i.e. leaving the world, simulate others first, etc.). It can more efficiently perform some of the track management usually put in TrackingAction. 3) Manage the stages of your event simulation by waiting until all tracks have reached a certain volume boundary, status, etc. 4) Manage individual jet processing. 5) Improve performance. 6) Set up some experimental-based priority among your tracks. 7) Event filtering. 8) Access and set various information based on having a particle and its secondaries all on the stack. 9) Analysis -- for instance, counting the number of optical photons generated. Also, see the User Application Guide's section on "Optional User Actions": http://geant4.web.cern.ch/geant4/G4UsersDocuments/UsersGuides/ForApplicationDeveloper/html/UserActions/OptionalActions.html Makoto Asai is an expert on this... See pages 12-15 from this G4 Tutorial talk: http://conferences.fnal.gov/g4tutorial/g4cd/Slides/Fermilab/AdvancedFeatures.pdf --JM
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