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Forum: Geometry
Re: Question Absolute replica number (Nicola Mori)
Re: None Re: Absolute replica number (John Allison)
Re: Feedback Re: Absolute replica number (Nicola Mori)
Re: None Re: Absolute replica number (John Allison)
Re: Feedback Re: Absolute replica number (Nicola Mori)
Date: 02 Aug, 2013
From: John Allison <John Allison>

Dear Nicola

I am not a geometry expert and I may still be misunderstanding you, but I'm still not happy about this. We do not want misconceptions to be propagated.

The touchable history should give you a unique path in terms of physical volumes and copy numbers. If there is ambiguity then there is a problem with the geometry definition. It would certainly give a problem if you wanted to identify the touchable, for example to change its visibility in the vis system. (Have a look at the guidance for /vis/set/touchable in Geant4 9.6 or 10.0.beta.)

You should not place the same logical volume with G4PVPlacement with the same name and copy number more than once.

Because replicas must fill their mother volume it is often necessary to create a mother just for this purpose. In that case the identifying copy number is that of the grandmother. Is that, perhaps, the issue?

John

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1 Feedback: Re: Absolute replica number   (Nicola Mori - 02 Aug, 2013)
(_ None: Re: Absolute replica number   (John Allison - 02 Aug, 2013)
(_ Agree: Re: Absolute replica number   (Nicola Mori - 02 Aug, 2013)
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