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Feedback Re: G4Polyhedra: Warnings from geometry test. 

Keywords: overlaps check
Forum: Geometry
Re: None G4Polyhedra: Warnings from geometry test. (Jeremy McCormick)
Re: None Re: G4Polyhedra: Warnings from geometry test. (Huaimin Liu)
Date: 20 Oct, 2006
From: Gabriele Cosmo <Gabriele Cosmo>

Hi Huamin,

> We got similar warnings when we used the solid G4TwistedTubs
> which is a kind of polyhedra.

let me point out first that G4TwistedTubs and G4Polyhedra have really nothing
in common, they're two completely different solids codes (and geometrical
shapes!). If you noticed a misbehavior in tracking and you're sure that your
geometry setup is correct it would be useful if you open a bug report providing
all the elements necessary to reproduce the problem; there exists a bug
reporting system for this. Making free statements in a public forum does
not help.

As for the problem reported by the built-in overlap checking command, this
doesn't necessarily mean it is a problem in the solid. It was already reported
(and there's a problem report open for it) cases of incorrect diagnosis of the
built-in overlap checking command, under some circumstances. It is useful to
have simple test cases like the one reported here for the polyhedra in order to
verify the origin of the problem.
To verify overlaps I would suggest to use also the tool introduced recently in
Geant4 for the overlaps checking at construction, and/or the DAVID tool.

Cheers, Gabriele

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1 None: Re: G4Polyhedra: Warnings from geometry test.   (liuhm@ihep.ac.cn - 22 Oct, 2006)
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