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Keywords: Volumes of G4Tubs, Boolean operations between G4Tubs w/ finite inner radii
Forum: Geometry
Re: Question Volumes of G4Tubs smaller? & Boolean operation between to 'ring's not working? (Kazuyoshi Furutaka)
Re: None Re: Volumes of G4Tubs smaller? & Boolean operation between to 'ring's not working? (John Allison)
Date: 11 Mar, 2005
From: Kazuyoshi Furutaka <Kazuyoshi Furutaka>

Dear John and all others,

> 1. G4Tubs seems to produce discs/tubes with smaller volume than
> expected.
>
> In 7.0, the volume printed by /vis/drawTree is the volume of the
> polyhedral representation. That explains the small difference. From the
> next release it will use the newly available GetCubicVolume method of
> solids, which is more exact.

Thanks John.  I see.  

> 2. It seems that Boolean operations (G4UnionSolid/G4SubtractionSolid/
> G4IntersectionSolid) don't work ...
>
> In my experience, Boolean operations give an error if the two volumes do
> not intersect, i.e., if one is wholly inside the other.

Well, in my previous examples, one solid with smaller outer radius is
twice as thick as the other with larger outer radius, as seen in the
"physUni1".

I think that the only difference between the "physUni1" and "PhysUni2"
(or between the "solidUni1" and "solidUni2") should be the existence of
inner radius.

Yours,
Kazuyoshi

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1 None: Re: Volumes of G4Tubs smaller? & Boolean operation between to 'ring's not working?   (John Allison - 11 Mar, 2005)
(_ Feedback: Re: Volumes of G4Tubs smaller? & Boolean operation between to 'ring's not working?   (Kazuyoshi Furutaka - 11 Mar, 2005)
(_ None: Re: Volumes of G4Tubs smaller? & Boolean operation between to 'ring's not working?   (John Allison - 12 Mar, 2005)
(_ Ok: Re: Volumes of G4Tubs smaller? & Boolean operation between to 'ring's not working?   (Kazuyoshi Furutaka - 12 Mar, 2005)
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