CGAL users discussion list

[Alejandro Aguilar Sierra <>]

Hi Matt,

Thank you for the hint. Actually what I want is to get the index of
the vertices on the container so I can build a drawable OBJ file.

A dirrty way to do it is using this code:

  for (CDT::Face_iterator fit = cdt.faces_begin(); fit!=
cdt.faces_end(); ++fit) {
    int idx = 0;
    int i0, i1, i2;

    for (CDT::Vertex_iterator vit = cdt.vertices_begin(); vit!=
cdt.vertices_end(); ++vit) {
      idx++;
      if ((*vit).point() == (*fit).vertex(0)->point())  i0 = idx;
      if ((*vit).point() == (*fit).vertex(1)->point())  i1 = idx;
      if ((*vit).point() == (*fit).vertex(2)->point())  i2 = idx;
    }

    std::cout << "f " << i0 << " " << cdt.triangle(fit) << std::endl;
  }

And I get a drawable mesh. Is there a cleaner way?

Regards.

-- A.


On Wed, Oct 7, 2009 at 7:21 AM, Matthew Denno 
<>
 wrote:
> Alejandro,
>
> Here is a link to the thread on Nabble:
>
> http://www.nabble.com/Question-on-Triangulation-ts25388558.html
>
> Hope it helps.
>
> Matt
>
> On Wed, Oct 7, 2009 at 8:04 AM, Matthew Denno 
> <>
>  wrote:
>>
>> I am not at my computer right now but if I recall there was a thread
>> discussing how to do this a few weeks back.  Maybe you could search and 
>> find
>> it.
>>
>> On Oct 7, 2009 12:56 AM, "Alejandro Aguilar Sierra" 
>> <>
>> wrote:
>>
>> Hello:
>>
>> I am studyng example examples/Mesh_2/mesh_global.cpp. The last line
>> prints the number of vertices.
>>
>> std::cout << "Number of vertices: " << cdt.number_of_vertices() <<
>> std::endl;
>>
>> I want to print instead the vertices and then the faces, so I can draw
>> the mesh with any mesh viewer.  Actually I am trying to create an OBJ
>> file.
>>
>> First I print the vertices
>>
>> for (CDT::Vertex_iterator vit = cdt.vertices_begin(); vit!=
>> cdt.vertices_end(); ++vit) {
>>    std::cout << "v " << (*vit) << " 0" << std::endl;
>>  }
>>
>> Now I want to print the faces, but just the individual faces prints
>> nothing.
>>
>> for (CDT::Face_iterator fit = cdt.faces_begin(); fit!=
>> cdt.faces_end(); ++fit) {
>>    std::cout << "f " << (*fit) << std::endl;
>> }
>>
>> Yes I am looking and trying, but no success so far.
>>
>> How can I get the vertices information from the faces?
>>
>> Any hint?
>>
>> Regards,
>>
>> --
>> Alejandro Sierra
>> --
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>
>