Re: TGeoXtru class in VMC

On Mon, 27 Mar 2006, Emil Frlez wrote:

> Thanks Ivana.
>
> If VMC can handle that shape, I think that many
> experiments would be interested in using that
> capability. There are number of crystal ball
> detectors that are geodesic break-downs resulting
> in irregular hexagons.
>
> Can I be pushy and ask you what would be a time
> scale (several months or ...?) for inclusion
> of TGeoXtru class into vgm?
>

   Not months :)
   I will have a look in a detail and let you know    in 1-2 weeks if it is feasible to support this    shape on the level of VGM only.

> Also, one more question. From your and a few
> other emails I received I realize that I don't
> understand the inner workings of VMC with
> G4/G3/other MCs. In my concrete case, TGeoXtru
> class - extruded polygon, is defined in ROOT,
> but not in VMC and Geant4. In order to use that
> class in Geant4 via root->Geant4 translation,
> is is enough to define that shape in VMC, or
> this class also has to be part of Geant4?
> Looking at your example vgm.2.07/examples/E02
> I thought that my geant4 code would run if
> TGeoXtru class is defined in ROOT and
> vgm.2.07/packages/Geant4GM/source/solids/
> and that something like G4Xtru class is no necessary?

   Yes, I hope so.
   If we manage to define the same shape using    existing Geant4 solids, we don't need to define    G4Xtru solid.    

   Best regards,

   Ivana

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e-mail:  Ivana.Hrivnacova_at_cern.ch
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