|Message: Re: Particle entering volume, ProcessHits()||Not Logged In (login)|
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> I try to check whether a particle just entered a sensitive volume. I do > the usual: > > G4bool just_entered = aPreStepPoint->GetStepStatus() == fGeomBoundary; > > The problem is that I get just entered = true several times in a row for > the same particle (I check it by vertex position to be sure). It can be > twice, it can be literally several times. > > Could somebody, please, explain what the problem here is and how it can > be fixed.
I understand you are getting 'just_entered' several times for the same interface and steps in immediate succession. I do not know of any intended mechanism that should produce this outcome. I suggest you turn SteppingVerbose on and provide us with the list of steps around where this happens. It may be a geometry/navigation issue (a bug in G4) or a bug in how you implemented your geometry.
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