Is there a method to avoid G4UserStackingAction::ClassifyNewTrack processes the same track multi times

[cxwx]

as the

G4UserStackingAction::ClassifyNewTrack processes the same track multiple times

Hi, I have a class which inherits from G4UserStackingAction, and I’ve noticed that the same track gets processed by the ClassifyNewTrack function multiple times. Stepping through an event with gdb, I’ve seen the same track many times. Is this an expected behavior, is it documented somewhere in the application developer or toolkit developer guides? Thanks, Chris

I want to trigger ClassifyNewTrack only once but Optical processes suspend the current track if there are enough number of optical photons.
I could use a large std::map<int trackID, int Istracked> to note the tracked track, but it would cause large memory if a shower has too many secondary particles for a event. I need to release the stack of notes when one track is totally ended. Is there a class in G4 to save the info?
without using G4TrackInformation.

[dsawkey]

@cxwx

I want to trigger ClassifyNewTrack only once but Optical processes suspend the current track if there are enough number of optical photons.

By default, G4Scintilllation and G4Cerenkov suspend the primary track when they produce secondaries. I don’t think ClassifyNewTrack is invoked by optical processes–maybe by the kernel. You can disable the suspension of the primary with
/process/optical/cerenkov/setTrackSecondariesFirst false
/process/optical/scintillation/setTrackSecondariesFirst false

but beware, your system memory may fill up.

https://geant4-userdoc.web.cern.ch/UsersGuides/ForApplicationDeveloper/html/TrackingAndPhysics/physicsProcess.html#configuration