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None Point is relocated in voxels - DICOM 

Forum: Event and Track Management
Date: 04 May, 2015
From: George Dedes <George Dedes>

Hi,

I've seen other posts in the forum about it, but I didn't find any definite answer:

I run a modified version of the DICOM example (release 10.01), with a parallel world that has two volumes used for scoring when a particles crosses them (phase space concept).

When I run the code I get relatively often the:

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1001
      issued by : G4Navigator::ComputeStep()
Point is relocated in voxels, while it should be outside!
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

I've seen that it happens mostly for electrons. I attach an example with track verbosity 1 in the file G4Forum1.txt.

The full log of this step is attached in G4Forum2.txt. The error message comes in step 2. It seems that the previous step assigns the location in the voxelized geometry while it should be out. This is seen in line 38, where the z position of the prestep and postep are 1153.50897375416 mm and 1153.575332783188 mm. My voxelized geometry in z extends from 1150.5 mm to 1153.5. So the step starting from 1153.575332783188 mm is assumed to be in the voxels when it actually isn't.

Should I just ignore this messages? When removing the parallel world I get no message. Nevertheless, the volumes at the parallel world are not in the vicinity of this track.

Thanks in advance, George

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/05/04/05.15-92575-G4Forum1.txt
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/05/04/05.26-49012-G4Forum2.txt

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1 Feedback: Re: Point is relocated in voxels - DICOM   (Patrik Eschle - 24 Aug, 2015)
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