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Forum: Event and Track Management
Re: Question Get Pointer to G4Track from TrackID (Ulrich Stiegler)
Date: 06 Sep, 2012
From: Michael H. Kelsey <Michael H. Kelsey>

On Thu, 06 Sep 2012 13:38:05 GMT, Ulrich Stiegler wrote:
> I have a G4int TrackID and would like to get the pointer (G4Track*) to
> this track.
> 
> In more detail: in UserSteppingAction I get the Track from
> fstep->GetTrack(). From there I get the praent ID via
> fstep->GetTrack()->GetParentID(). Now I want the pointer to this parent
> track, so that I can figure out the history of the track.
> 
> Thanks in advance for an answer, Uli

Unfortunately, you cannot. G4Track is a transient entity. Once a track stops (or is killed), it is deleted from the stack and no longer exists. While the track exists, it only contains the corresponding particle's current (instantaneous) kinematics, not the past history.

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