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Forum: Geometry
Re: None Assignation of SD to a mother volume (C Mos)
Date: 24 Oct, 2012
From: Michael H. Kelsey <Michael H. Kelsey>

On Wed, 24 Oct 2012 15:31:24 GMT, C Mos wrote:
> Hi Just to clarify, [Q1] when you assigned a SD to a mother volume, is
> it inherited by its daughter volumes? aka when a hit is produced inside
> the daughter, this hit will get registered into the mother's SD?

No. The SD is not inherited. You can remember this if you visualize the point of view of the track: When it enters the mother volume from outside, it is passing through that volume's "material", including the SD, and anything it does there may be recorded by the SD. When it crosses the boundary of the daughter, it is no longer passing through the mother volume's "material," so the mother's SD won't see it any more.

> [Q2] Do SD assignations have to be done after all volumes are defined?
> For example, I defined the mother volume first, then I assign it a SD
> and then I load a daughter volume to it. Does the order matter in this
> case or geant would take care of it when closing the geometry?

The order doesn't matter, so long as everything is done before the geometry is closed.

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1 Question: Re: Assignation of SD to a mother volume   (C Mos - 25 Oct, 2012)
(_ None: Re: Assignation of SD to a mother volume   (Mike Kelsey - 25 Oct, 2012)
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