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Forum: Event and Track Management
Re: Question Problems in accessing materials and volumes in SteppingAction (Daniel Matthiń)
Re: Disagree Re: Problems in accessing materials and volumes in SteppingAction (Gumplinger Peter)
Date: 15 Jun, 2011
From: Daniel Matthiń <Daniel Matthiń>

Dear Peter,
thank you for your reply. I have checked for overlapping volumes and this is not the problem. I am using G4PhantomParameterisation() and I found out that the problem does not occur with every voxel size. For example I checked for two mm voxel which worked fine. However I need to construct a voxel model with voxel sizes 2.137 mm. I additionally observed that the discrepancies only occur if a sensitive detector is registered to the logical volume building the base of the parameterisation. Is this allowed at all?
I attached a very simplified version of my Parameterisation (TestParam.cc, TestParam.hh) which has voxels filled with vacuum for x<0 and G4Water for x>0 and a very simple sensitive detector implementation (TestSD.cc, TestSD.hh) which does nothing. If i am using a beam in positive x direction the described behaviour occurs in the first voxels at x>0. First there is a step in vacuum to reach the first voxel filled with water. Then there is one step in water which is fine but then there is another step in vacuum.
Maybe there is a mistake in my implementation or is it not possible to use a sensitive detector with the logical volume?
By the way, the problem does not occur with GEANT4.9.3.p02 only with GEANT4.9.4.p01.

Best regards,
Daniel


   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/06/15/03.57-98951-TestParam.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/06/15/03.57-17668-TestSD.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/06/15/03.57-98810-TestSD.hh
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/06/15/03.57-53073-TestParam.hh

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