[Gate-users] Regular Parameterization Error with Geant4 v10

[Maxime Chauvin]

Hello Nicolas,

I had the same problem as you and couldn’t fix it. On the other hand there is a even more efficient way  using
ImageRegionalizedVolume. It will further speed up the simulation especially if your geometry has a lot of common voxel
and you will get rid of this warning.

Cheers,
  Maxime 

> On 10 Feb 2017, at 14:41, Triltsch, Nicolas <nicolas.triltsch at tum.de> wrote:
> 
> Hello,
> 
> I tried to speed up my simulation by choosing Regular Parameterization (with flag skipEqualMaterials to 1) instead of Nested Parameterization, because my Volume got a lot of voxels with the same material. It did indeed speed up the simulation by a factor of 15, but some projections of my CT simulation failed (error: segmentation fault; crash).
> 
> Now I saw that during the initialization phase of gate it states the following:  
> ### WARNING ### setSkipEqualMaterials at false !! The Geant4 method is not safe since the release 9.5 - Need to be fixed
> 
> I am pretty sure that this warning is somehow connected to the warning. Does anyone know if there had been a bug fix for Geant4 v10.2.2?
> 
> In the appendix there is a screenshot of the error.
> 
> Cheers,
> Nico
> -- 
> B.Sc. Nicolas Triltsch
> Masterand
> 
> Technische Universität München
> Physik-Department
> Lehrstuhl für Biomedizinische Physik E17
> 
> James-Franck-Straße 1
> 85748 Garching b. München
> 
> Tel: +49 89 289 12591
> 
> nicolas.triltsch at tum.de <mailto:nicolas.triltsch at tum.de>
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