Problem 91 - Infinite loop in tracking geantino in a simple tube segment
Summary: Infinite loop in tracking geantino in a simple tube segment
Status: CLOSED DUPLICATE of problem 76
Alias: None
Product: Geant4
Classification: Unclassified
Component: geometry/volumes (show other problems)
Version: 1.0
Hardware: PC Linux
: P2 critical
Assignee: John Apostolakis
URL: /afs/cern.ch/user/g/gcosmo/public/bug...
Depends on:
Blocks:
 
Reported: 2000-04-28 02:03 CEST by Ivana.Hrivnacova
Modified: 2000-05-18 12:22 CEST (History)
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Description Ivana.Hrivnacova 2000-04-28 02:03:24 CEST 
We are getting infinite loop when geantino is
tracked in a simple tube segment (G4Tubs with SPhi<0).

The concrete examples (modified N02 detector construction
class + test macro and test output) is provided in:
/afs/cern.ch/user/i/ivana/public/g4looping
Comment 1 Gabriele Cosmo 2000-05-03 05:47:59 CEST 
I verified that the loop happens in G4Navigator (G4NormalNavigation) as the
step-length is always set to zero. I modified the simple test-case based on
exampleN02 and made it available in my public AFS area:
   ~gcosmo/public/bug91.tar.gz
I verified that the problem persists in reference tag "geant4-01-01-ref-03".
Comment 2 John Apostolakis 2000-05-16 11:38:59 CEST 
*** This bug has been marked as a duplicate of 76 ***
Comment 3 Vladimir.Grichine 2000-05-17 12:01:59 CEST 
Bug fixed in G4Tubs::DistanceToOut
Comment 4 John Apostolakis 2000-05-18 12:22:59 CEST 
Confirmed that the program now works - does not loop - when using the new
fix in the Tubs.