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Forum: Geometry
Re: Question Multiple Geometry Updates Necessary? (Daniel Mittelberger)
Re: None Re: Multiple Geometry Updates Necessary? (Vladimir IVANTCHENKO )
Re: None Re: Multiple Geometry Updates Necessary? (Daniel Mittelberger)
Date: 30 May, 2007
From: Makoto Asai <Makoto Asai>

Given you started with TestEm5, I presume you delete all
volumes before you re-build the new geometry. Your
symptom sounds like your detector construction has
either
1) not deleting / instantiating all the volumes properly
or
2) some volumes overlaps on each other.

If you are using just G4PVPlacement, try the optional
geometry checking flag. (and do not forget to set it back
to false when you finish)

Makoto 

> -----Original Message-----
> From: Daniel Mittelberger [mailto:dem@gwu.edu] 
> Sent: Wednesday, May 30, 2007 11:24 AM
> To: publichypernews
> Subject: Re: Multiple Geometry Updates Necessary?
> 
> *** Discussion title: Geometry
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/geometry/733/1/1"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> I do not believe the second run starts with the same seed, but the
> difference between runs is greater that just small variations. In some
> runs, energy is deposited in the detector as it should be, 
> but in others
> all of the events deposit zero energy. Visualizing the system using
> OGLIX, it looks like the detector after being updated has a strange
> geometry. Rather than being a cylinder, it looks like several circles
> and lines that do not form any recognizable shape. Then 
> updating again,
> it looks like it should, as a cylinder.
> 

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1 None: RE: Multiple Geometry Updates Necessary?   (Daniel Mittelberger - 30 May, 2007)
(_ None: RE: Multiple Geometry Updates Necessary?   (Makoto Asai - 30 May, 2007)
(_ None: RE: Multiple Geometry Updates Necessary?   (Daniel Mittelberger - 31 May, 2007)
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