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Forum: Geometry
Re: Question CAD to GEANT4 interface. Current state. (Siarhei Yakushevich)
Date: 11 Oct, 2010
From: Gabriele Cosmo <Gabriele Cosmo>


there're no alternative solutions than those mentioned in the user manual
and, given the current resources, we don't plan to provide new ones.
Import through tessellated shapes works, although it may not be very
efficient for complex imported shapes.
An alternative approach for conversion of CAD geometries to GDML is being
studied in the context of the SALOME (
project, you may want to take a look at that one as well...

Cheers, Gabriele

On Mon, 11 Oct 2010 09:45:13 GMT, Siarhei Yakushevich wrote:
> Greeting everyone, My problem is to develop, better to find some
> application for converting solid detectors geometry from almost any CAD
> software to GEANT4. Therefore I chose STEP file format as most common
> one.
> What kind of alternatives common formats exist?
> STEP format is IS010303 and has several Application Protocols, but it is
> commercial and I did not find any kind of description for free, just
> short one from Wikipedia and something similar, but not full
> description.
> I do know about existing applications such as FASTRAD and ST-Viewer. As
> always I am looking into direction of something free....
> I tried FASTRAD. It represented input geometry as set of triangles, and
> GEANT4 has a problem with rendering such set of triangles. FASTRAD does
> not have any opportunity of using something else as basic element. For
> instance, cubes, cylinders.
> Is it possible to tune somehow GEANT4 so it will take less time to
> display geometry based on triangles?
> Maybe, someone know any kind of other application which uses other basic
> elements instead of triangles?
> Let's look at the problem from the other side - GEANT4 side. Which
> another, supported by GEANT4 import format instead of STEP can be easily
> exported by majority of CAD application?

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1 Question: Re: CAD to GEANT4 interface. Current state.   (Siarhei Yakushevich - 12 Oct, 2010)
1 More: Re: CAD to GEANT4 interface. Current state.   (Gabriele Cosmo - 12 Oct, 2010)
2 None: Re: CAD to GEANT4 interface. Current state.   (Paul, Le TEXIER - 14 Oct, 2010)
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