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Forum: Geometry
Re: Question About lost particle treatment in Geant4 (Yuefeng Qiu)
Date: 12 Nov, 2014
From: Marc Verderi <Marc Verderi>

Dear Yuefeng,

There is no "treatment" in the case you describe: such situation is not 
allowed in Geant4, and is considered as a real bug of the user geometry 
implementation. The behavior can not be really predicted (depends on 
many things about the way the track came here: the track may "think" it 
is outside the entire volume, given it is outside the daughter (and 
hence the mother) volume, but not always...).

There are several ways to detect overlapping volumes (please refer to 
"4.1.11. Detecting Overlapping Volumes" of the user's guide for 
application developers). At tracking time, the problem may or may not be 
detected.

Cheers,
Marc

On 11/12/2014 10:11 AM, Yuefeng Qiu wrote:
> *** Discussion title: Geometry
>
> Dear all,
>
> I am not so clear about the mechanism of Geant4 in treating lost
> particles due to e.g. geometry overlapping. I do not have any specific
> problem. But I just interested in this question.
>
> For example, if a mother volume is smaller than a children volume, the
> particles go out of the children volume might already outside the mother
> volume. Is there any way to detect this problem, or Geant4 just simply
> let it runs in a infinite loop?
>
> Best regards, Yuefeng
>
> -------------------------------------------------------------
> Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at:
> http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1380.html

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