CGAL users discussion list

[phdprav <>]

Mariette Yvinec wrote
> 
> The function
> template <class C2t3>
> bool output_surface_facets_to_off (std::ostream& os,
>                     const C2t3& c2t3,
>                     int options =
>                     Surface_mesher::IO_ORIENT_SURFACE)
> available in file
> CGAL/IO/complex_2_in_triangulation_3_file_writer.h
> should do more or less what you want
> 
> Dear Mariette,
> 
> First of all thank you for your answer, it was very useful. The implicit
> surface mesher has allowed me to create a wide range of different surfaces
> with varying smoothness to perform numerical tests on. 
> 
> One issue I've had with it was that the generated points of the mesh were
> not close enough to the actual surface for the particular numerical tests
> I had in mind. To give you an example, when meshing the unit sphere the
> resulting l2 norm of points of the mesh was around 10^-4 away from 1.
> Ideally I'd like points much closer to the actual surface. Is there some
> tolerance parameter that can be set to increase the accuracy? Thank you.
> 
> Le 06/12/11 11:32, phdprav a écrit :
>> Dear cgal community,
>>
>> I am new to CGAL and this should hopefully be a rather simple question. I
>> am
>> trying to obtain the vertices and corresponding simplex for a 3D surface
>> defined implicitely as a level set function. My starting point is the
>> example program mesh_an_implicit_function.cpp
>>
>> I'd like to modify this program so that it outputs a file with a format
>> similar to the one shown below:
>>
>> VERTEX // Coordinates of the vertices
>> 1 0 1  // vertex 0
>> 0 -1 0 // vertex 1
>> 1 0 0 // vertex 2
>> 1 0 -1
>> -1 0 0
>> 0 1 0
>>
>> SIMPLEX
>> 0 1 2 // triangle 0 made up of vertex 0, 1, 2.
>> 1 3 2
>> 1 4 3
>> 4 5 0
>> 0 1 4
>> 4 5 3
>> 0 5 2
>> 5 3 2
>>
>> So basically all I want is to access the vertices, and to know which
>> vertices form which elements, of a given mesh generated by the example
>> code
>> mesh_an_implicit_function.cpp. Any advice on how I should go about doing
>> this? Thank you.
>>
>> --
>> View this message in context:
>> http://cgal-discuss.949826.n4.nabble.com/Accessing-vertices-and-simplex-information-tp4164177p4164177.html
>> Sent from the cgal-discuss mailing list archive at Nabble.com.
>>
> 
> -- 
> Mariette Yvinec
> Geometrica project team
> INRIA  Sophia-Antipolis
> 
> 
> 
> 
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Sent from the cgal-discuss mailing list archive at Nabble.com.