|Message: Re: passing info to tracks||Not Logged In (login)|
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Hi, In your PrimaryGeneratorAction, after generating primaties, and just before returing the G4Event pointer, you can add your information to G4PrimaryVertex and G4PrimaryPartcle objects by creating your class objects derived from G4VUserPrimaryVertexInformation and G4VUserPrimaryPerticleInformation. Then, in your PreUserTrackingAction, G4Track has a pointer to corresponding G4PrimaryParticle object if the track is a primary, so that you can copy the information in your G4VUserPrimaryVertexInformation and G4VUserPrimaryPerticleInformation objects to yet another your class object derived from G4VUserTrackInformation. This user track information class should be attached to the G4Track object. This information class can be copied to the daughter secondaries, if needed. Now, once a track has come to a sensitive volume, your sensitive detector sees a step (G4Step) of this track, i.e. you get the information to be copied to your hit. Please look at examples/extended/runAndEvent/RE01 as your reference. You may also want to look at sldes 11 through 13 of this presentation, http://geant4.slac.stanford.edu/tutorial/jlab06/Kernel2.ppt which is presented at the Geant4 tutorial at Jefferson Lab.
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