CGAL users discussion list

[Ramin H <>]

Thank you very much Laurent. I appreciate your help.

I will dig further to see how I should use concept MeshCriteria_3 to
implement this.

I wish there was similar attempt for surface mesh or 2D meshing so I
could see how this is done.

Thanks again,
-Ramin


On Thu, Dec 17, 2009 at 11:45 AM, Laurent Rineau (GeometryFactory)
<>
 wrote:
> On Wednesday 16 December 2009 18:04:56 Ramin H wrote:
>> I looked at Mesh_criteria_3.h, Mesh_facet_criteria_3.h and
>> Mesh_cell_criteria_3.h. As far as I understand, these are the default
>> meshing criteria defined in CGAL package for Mesh_3 process.
>>
>> This is how Mesh_cell_criteria_3's constructor looks like:
>> Mesh_cell_criteria_3(const FT& radius_edge_bound,
>>                        const FT& radius_bound)
>>
>> so, we realize that radius_edge_bound and radius_bound are functors.
>
> No they are not functors! They are a const reference to a FT (field type).
> With most CGAL kernels, "FT" is equal to "double".
>
>> Now, going back to
>> CGAL-3.5/examples/Mesh_3/mesh_polyhedral_domain.cpp, is it possible to
>> define the following and expect this to just work?
>>
>> typedef K::FT FT;
>> typedef FT (Function)(const Point&);
>>
>> FT function_1 (const Point& p)
>> {
>>   const FT x1=p.x();
>>   const FT y1=p.y();
>>   const FT z1=p.z();
>>   return x1+y1+z1+1;
>> }
>
> Be careful with that example: that size field is zero along the plane of
> equation x+y+z-1=0, and is negative on the negative size of that plane!
>
>> and then in main.cpp,
>> int main()
>> {
>>   // ...
>>   Cell_criteria cell_criteria(function_1, 0.2);
>>   // ...
>> }
>>
>> I appreciate your feedback.
>
> No, that is not possible as-is. You need to define your own model of the
> concept MeshCriteria_3.
>
> --
> Laurent Rineau, PhD
> R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
> Release Manager of the CGAL Project       http://www.cgal.org/
>
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