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Forum: Geometry
Re: None complex geometry (Agnieszka Priebe)
Date: 31 Oct, 2007
From: John Apostolakis <John Apostolakis>

Hello.

It is possible to create quite a large set of complex shapes in Geant4. 

One way is to use the existing CSG shapes, in case they have the correct 
properties: spherical shells with cuts in phi and theta are possible in 
G4Sphere etc.

Some more complex shapes are also direclty available: polycons are a 
continuous set of cones and cylinders that share an axis.

Another is to compose the shape, if it is made of triangles and quadrangles.

And finally you can create a shape using existing shapes (basic 
preferably) via Boolean operations: union, subtraction and intersection.

Beyond this, if you have an existing description of a solid in a CAD 
system there are an emerging set of tools to create an approximation of 
it for use with Geant4. 

For more information on these please look at the documentation.

Best regards,
John Apostolakis

agnieszka.priebe@cern.ch wrote:
> *** Discussion title: Geometry
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/geometry/805"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
>
> Hi, I would ask you how is it possible in Geant4 to achive complex
> figures? I mean not only connections of basic commend like
> G4Box,G4Tubs... I need to create a shape of complicated magnets. Could
> you help me? Best regards Agnieszka Priebe
>   

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