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RE: [cgal-discuss] advice about CGAL Delaunay Triangulation


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  • From: Kwok Jasper <>
  • To: <>
  • Subject: RE: [cgal-discuss] advice about CGAL Delaunay Triangulation
  • Date: Mon, 2 Feb 2009 22:41:41 +0800
  • Importance: Normal

Thank you

The code I am using is as follows


typedef CGAL::Delaunay_triangulation_3<K1> Triangulations;
typedef Triangulations::Point Point_tr;
typedef Triangulations::Facet Facet;
typedef Triangulations::Finite_facets_iterator finite_facets_itr;
typedef Triangulations::Triangle Triangle;

    list<finite_facets_itr> temp;
    Triangle temp_triangle;
    double temp_circumradius = 0;
    double temp_max_inter_vertice_dist;

    finite_facets_itr starting_facet = Tr.finite_facets_begin();
    finite_facets_itr ending_facet = Tr.finite_facets_end();
    finite_facets_itr current_facet = starting_facet;

    for(current_facet = starting_facet; current_facet != ending_facet; ++current_facet)
    {
          temp_triangle = Tr.triangle(*current_facet);

          if ( .......)
          {
               temp.push_back(current_facet);
          }
    }


And I have attached in this email about the configuration of the machine I am using.

Thank you very much



> Date: Mon, 2 Feb 2009 15:09:11 +0100
> From:
> To:
> Subject: Re: [cgal-discuss] advice about CGAL Delaunay Triangulation
>
>
> Jasper,
>
> The limitation of the std::list should be the virtual memory.
>
> Concerning the Finite_faces_iterator, are you sure not
> to forget to increment the iterator?
>
> Can you send us the code of your loop.
>
>
>
> I would be glad to know the configuration of your machine.
>
> As you are on Windows, could you go to Start -> Control Panel -> System
> and then tell us what is written in the tab 'General".
>
> On my machine I see
>
> System:
> Microsoft Windows XP
> ...
>
> Registered to:
> ...
>
> Computer:
> AMD Turion
> ML 40
> 2.19 GHz, 896 MB of RAM.
>
>
> What is written there on your computer?
>
> andreas
>
>
>
> Kwok Jasper wrote:
> > Excuse me, may I seek for some advise about using the Delaunay
> > Triangulation?
> >
> > If I have the Delaunay Triangulation declared as follows
> >
> >
> > typedef CGAL::Exact_predicates_inexact_constructions_kernel K1;
> > typedef CGAL::Delaunay_triangulation_3<K1> Triangulations;
> >
> >
> > After I have inserted several ten thousand points into the
> > triangulation, I use the Finite_facets_iterator to iterate over all of
> > the triangular faces in the triangulation.
> > For each of the triangular face, I check for some condition and if they
> > satify the condition, I push then into a std::list<Finite_facets_iterator>
> >
> > However, when I use the std::list<Finite_facets_iterator> to store all
> > those triangular face, I get the exception saying that memory for the
> > program is used up.
> > May I ask if it is that for huge number of points inserted into the
> > Delaunay Triangulation, it is not recommended to use std::list or
> > std::vector to store the above information?
> >
> > If it is not recommended, what structure may I use for the storage.
> >
> > Thank you very much.
> >
> > ------------------------------------------------------------------------
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> > <http://www.microsoft.com/windows/windowslive/>
>
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Attachment: configuration_information.JPG
Description: JPEG image




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