CGAL users discussion list

[Zhanghong Tang <>]

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?
>
> 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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