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Forum: Geometry
Re: None G4Exception : GeomNav1002 (elnaz yazd)
Date: 13 Feb, 2017
From: John Apostolakis <John Apostolakis>

Dear Yazdan,

The warning message which you report is a minor issue from which the 
Navigator can recover.  It is not clear that that, if the program hangs, 
there is a problem connected with this issue.

Without further information it is difficult to provide advice how to 
proceed to identify the source of the problem.

What version of Geant4 are you using ?  Are you running in sequential or 
multi-threaded mode?  What operating system and compiler are you using ?

If you re-run with the same random number seed, do you get the same 
results ?

What energy are your primary particles - and what type of particles ?

How long does an event take ?  If the energy is low, and the time 
limited, I suggest that you re-run the last event (or few events) with
  /tracking/verbose 1
to help demonstrate where the problem occurs.

Do you have other volumes in your geometry, and how do they relate to 
the DICOM volume ?

Best regards,
John Apostolakis

On 13/02/17 07:39, elnaz yazd wrote:
> *** Discussion title: Geometry
> Dear Sir/Madam
> I am running DICOM example with data from CT for head. The geometry is
> 110 layer with 128x128 voxels for each layer and the dimension of voxels
> are (2.01562mm, 2.01562mm, 1mm). The following error is happens with
> some initial seed numbers and program hangs in this format. As it is
> clear the problem happens in the voxel around the origin of local point.
> Please help me to get ride of this problem.
> Track stuck or not moving.
>            Track stuck, not moving for 10 steps
>            in volume -phantom- at point (1.17148,-1.36137e-10,-170) (local point (0.163671,1.00781,-0.5))
>            direction: (0.0296006,4.86496e-05,0.999562) (local direction: (0.0296006,4.86496e-05,0.999562)).
>            Potential geometry or navigation problem !
>            Trying pushing it of 1e-07 mm ...Potential overlap in geometry!
> *** This is just a warning message. *** -------- WWWW --------
> G4Exception-END --------- WWWW -------
> With Best Regards, Yazdan
> -------------------------------------------------------------
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