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On Mon, 16 Oct 2017 18:22:43 GMT, Mark Chernikov wrote:
> Okey. But how in this case i could count number of secondaries per track > (if primary particle is electron and secondaries are optical photons)? > And where i could call method GetVertexPosition() to record my > coordinates in output file one time per track? I thought that the best > place to do this is TrackingAction. Thank you.
For counting secondaries, I don't think TrackingAction is appropriate. Secondaries are produced at individual G4Steps, so your SteppingAction (or a generalized SensitiveDetector) is the right place to count secondaries. You'll need to maintain some sort of buffer indexed on TrackID (array, vector, or even std::map<G4int,xxxx>) to accumulate those totals per event.
For GetVertexPosition(), you can use TrackingAction. Since the vertex position doesn't change, you can ensure a single access per track by looking at theTrack->GetCurrentStepNumber(), and only do the one-time-only work on the first step.
-- Michael Kelsey