CGAL users discussion list

[Mael Rouxel-Labbé <>]

Hello,

The periodic mesh package does not support parallel execution (Periodic_3_mesh_3 uses Mesh_3, which does support parallel execution, but Periodic_3_mesh_3 feeds a periodic triangulation which does not yet support parallel execution).

It is intended that it gives you a compilation (and even runtime just in case) error.

Best,
Mael

On 04/11/2022 17:11, mi.correo.temporal ( via cgal-discuss Mailing List) wrote:

        Hello,
      
        
      
      
        Thanks for the explanation and solution! Is there any chance
        that me running into compilation issues when using the periodic
        mesh package in code that was set up to compile in concurrent
        mode is somehow related to this?
      
      
        
      
      
        Regards,
      
        Kim

---

From: on behalf of Mael Rouxel-Labbé
Sent: Monday, October 17, 2022 2:54 PM
To:
Subject: Re: [cgal-discuss] Issues when using periodic mesh headers and make_mesh_3.h

 

Hello,

The issue is that Mesh_3 makes uses of some triangulation features to speed up location function, and these features are not compatible with the 3D Periodic Mesh package.

These optimizations are in the triangulation code, which is common to both packages. Ideally a runtime switch would enable/disable them, but there is currently only a compile-time way of disabling that optimization, using the following macros:

#define CGAL_NO_STRUCTURAL_FILTERING

#define CGAL_MESH_3_SIZING_FIELD_INEXACT_LOCATE 0

This is properly done if you include <CGAL/Periodic_3_mesh_3/config.h> before including any other Mesh_3 headers, and you will be able to use both codes (albeit, with disabled location optimizations for Mesh_3).

However, you are getting these compilation errors because you have included Mesh_3 headers before Periodic_3_mesh_3 headers, and consequently the triangulation headers were included with optimizations enabled.

I will change <CGAL/Periodic_3_mesh_3/config.h> to give a clearer error and the fix (i.e., put this config header at the top).

Best, Mael

On 17/10/2022 14:05, mi.correo.temporal ( via cgal-discuss Mailing List) wrote:

Dear all,

            When compiling code that includes both, the periodic meshing
            headers and CGAL/make_mesh_3.h a very long list of error is
            given. I guess the easiest way to reproduce the issue is to
            take the example
            
              Periodic_3_mesh_3/mesh_implicit_shape.cpp and simply
            add #include <CGAL/make_mesh_3.h> at the top. Any help
            is welcome.
          
          
            
          
          
            Regards, Kim
          
          
            
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