Track ID of the secondary electrons was 0

Particles, Track, Event, Run and Biasing
1

I want to count the TrackID of the electron created by the photon emitted, but I found that the TrackID of the electron are all 0, I think it’s a mistake somewhere. By the way, I also output it’s parentID, it’s name and it’s energy , and it works well.

I hope someone can tell me why, I also write the details in my code, thank you very much!

Here is my code
SteppingAction.cc (5.2 KB)

_Geant4 Version:_11.2.1
_Operating System:_GNU ld (GNU Binutils) 2.37
_Compiler/Version:_11.2.0
_CMake Version:_GNU Make 4.3

2

It might be worthwhile to try passing the secondaries vector to your TrackingAction and trying to record their track IDs in the PostUserTrackingAction instead.

3

It is possible that the trackID isn’t zero but merely casting an undefined variable.
Really you want to use

G4TrackVector* secondaries = fpTrackingManager->GimmeSecondaries();
size_t nSeco = secondaries->size();

if (nSeco > 0){
     for(size_t i=0; i < nSeco; i++) {
             // (*secondaries)[i] is the secondaries of the current track
             // your code here
          }
}

This might be hard to chase avoid double counting/pointless CPU time checking sets in the stepping action. @ctwhite is right that this is better to handle in the PostUserTrackingAction and it will be significantly faster since it will check once and only once.