CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

CGAL cannot handle directly cylinders but only discrete polyhedral models.

See the documentation of Nef package for more details:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Nef_3/Chapter_main.html

Sebastien.

On 01/18/2012 10:41 AM, Zhanghong Tang wrote:
> Dear Dr. Loriot,
> 
> Thank you very much for your kindly reply.
> 
> My requirement is as follows:
> 1) read the geometries to do the operations;
> for example, two cylinders with both radius 1 and length 10, the center 
> of top and bottom facet of two cylinders are:
> cylinder 1:
> top facet: (0,0,5)
> bottom facet: (0,0,-5)
> cylinder 2:
> top facet (5,0,0)
> bottom facet: (-5,0,0)
> 
> 2) find the 3D Boolean operations of input objects and output the 
> presentation by OFF file format.
> for example, find the unite of two crossed cylinders and output the 
> presentation by OFF file format.
> 
> 
> How to implement this with mimimal code?
> 
> 
> Thanks,
> Zhanghong Tang
> 
> 
> P.S.:
> I notice that the mesher 'NetGen' takes the CSG format as its input 
> file, however, it can't handle the simplest example (it works when the 
> radius of two cylinders are not equal), I guess that the CGAL can handle 
> it easily.
> 
> 
> 
>  > Date: Wed, 18 Jan 2012 08:25:30 +0100
>  > From: 
> 
>  > To: 
> 
>  > Subject: Re: [cgal-discuss] What's the minimal requirement to use the 
> Constructive Solid Geometry (CSG) module of CGAL?
>  >
>  > Zhanghong Tang wrote:
>  > > Dear all,
>  > >
>  > > I would like use the CSG module of CGAL, what's the minimal 
> requirement
>  > > to use this module? I want to build it to a blockbox with CSG module
>  > > data input and another format data output (for example, piecewise 
> linear
>  > > complex format, Geomview's polyhedral file format (OFF)), which files
>  > > should I select to compile and is there any interface to use this 
> module?
>  > >
>  > > Thanks,
>  > > Zhanghong Tang
>  > >
>  > Your question is not clear to me. Could you explain what you are looking
>  > for exactly?
> &g t;
>  > For 3D Boolean operations, you need to use Nef_3:
>  > 
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Nef_3/Chapter_main.html
>  > For simple polyhedron manipulation, you can use Polyhedron_3:
>  > 
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Polyhedron/Chapter_main.html
>  >
>  > Sebastien.
>  >
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