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Forum: Geometry
Re: None G4Exception : GeomNav1002 (elnaz yazd)
Date: 15 Oct, 2017
From: Sungho Chang <Sungho Chang>

I have suffered from same error, but I found that the G4Exception:GeomNav1002 disappered when I used other parameterisations in http://geant4.web.cern.ch/geant4/UserDocumentation/Doxygen/examples_doc/html/ExampleDICOM.html .

I tried to use the nested parameterisation and 3D optimization with G4SmartVoxel(SetRegularStructureId(0)) respectively instead of the default parameterisation and navigation, G4PhantomParameterisation/G4RegularNavigation, and there is no error message of G4Exception:GeomNav1002.

In my simulation, the nested parameterisation was much faster( a few thousands times) than 3D optimization.

I hope this will be helpful.

On Mon, 13 Feb 2017 06:39:15 GMT, elnaz yazd wrote:

> 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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