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Forum: Geometry
Re: None Geometry from NURBS (Adam Geva)
Re: None Re: Geometry from NURBS (John Apostolakis)
Date: 06 Jul, 2017
From: Adam Geva <Adam Geva>

On Thu, 06 Jul 2017 12:22:03 GMT, John Apostolakis wrote:
> Dear Adam,
> 
> Please look at the Geant4 documentation for importing CAD files. You 
> will need to convert the solids in the structure into triangulated 
> surface models, and import it using GDML or a simpler format.  You can 
> find all this described in the Users Guide for Application Developers - 
> so I will not provide any pointers or additional information.  There are 
> different tools available.
> 
> If you want direct simulation in NURBS, there is no easily available 
> solution in Geant4.  There is a development of 'G4DAGSolid' which allow 
> one to interface a geometry described to the DAGMC toolkit - which has 
> its own workflow.
> 
> Note that you will need to double check that the solids created by your 
> phantom are bounded by a full surface, which is not missing parts.
> 
> I note that, if there are areas which are not described by these solids, 
> Geant4 can cope with it, as it assumes that the material is that of the 
> parent volume.
> 
> Best regards, John
> 
> On 06.07.17 10:57, Adam Geva wrote:
> > *** Discussion title: Geometry
> >
> > Hi,
> >
> > I have a human phantom describes by a NURBS structure - knots and
> > control points, and materials. I was wondering whether this could
> > somehow be loaded onto Geant4 to construct geometry?
> >
> > Thanks, Adam
> >
> > -------------------------------------------------------------
> > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at:
> > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/geometry/1541.html
> 

Hi John, Thanks for your quick response! I will look into it. As a rule of thumb, should I expect better performance when importing a CAD model as opposed to using a voxelized version of the same phantom? I'm trying to gauge whether it is worth the hassle..

Thanks again, Adam

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1 None: Re: Geometry from NURBS   (John Apostolakis - 06 Jul, 2017)
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