Problem 1773

Summary:	Segmentation Fault from GetOriginTouchable
Product:	Geant4	Reporter:	Steve Quillin <steve.quillin>
Component:	event	Assignee:	Andrea Dotti <andrea.dotti>
Status:	RESOLVED FIXED
Severity:	trivial	CC:	asai
Priority:	P5
Version:	10.1
Hardware:	PC
OS:	Linux

Description Steve Quillin 2015-08-07 16:28:49 CEST

Accessing information from a touchable obtained from track->GetOriginTouchable() gives a segmentation fault if the track is a source (primary) particle.

Examples from steppingaction :-

G4Track* aTrack = theStep->GetTrack();
const G4VTouchable * t1= aTrack->GetOriginTouchable()  ;  // ok
G4VPhysicalVolume *p1  = t1->GetVolume()               ;  //  Instant segfault if aTrack->GetParentID()==0

But:-

if(aTrack->GetParentID()>0) G4cout<<t1->GetVolume()->GetName() << G4endl;  // ok



It's a trivial issue to work around I know. I just thought I'd report it as it caught me out for a while and may do so others also.

Please request further information if required.


Thanks 

Steve Quillin

Comment 1 kurasige 2015-08-09 07:32:52 CEST

OriginTouchable is set in G4EventManager::StackTracks.
It seems that  the OriginTouchable is set to primary tracks as well as secondary tracks. I have no idea on this problem.

Comment 2 asai 2016-01-28 00:29:15 CET

Sorry for the belated response.
Fix will be included in the next patch release.
Kind regards,
Makoto Asai