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Re: [cgal-discuss] Converting Google Maps HD meshes


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  • From: Claus Volko <>
  • To:
  • Subject: Re: [cgal-discuss] Converting Google Maps HD meshes
  • Date: Mon, 28 Aug 2023 10:23:25 +0200
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Ah, okay! Thanks! Now it seems to be working well, indeed. I'm happy. Merci bien!

Am Mo., 28. Aug. 2023 um 10:17 Uhr schrieb Sebastien Loriot <>:
Note the Polygon_mesh_processing namespace before IO

On 8/28/23 10:15, Claus Volko ( via cgal-discuss
Mailing List) wrote:
> I'm confused. The code I sent you contains these lines:
>
>    Polygon_mesh polygon_mesh;
>    if (!CGAL::IO::read_polygon_mesh(filename, polygon_mesh)) {
>
>
> I thought this is the method you proposed to use in your most recent email.
>
> Am Mo., 28. Aug. 2023 um 10:09 Uhr schrieb Sebastien Loriot
> < <mailto:>>:
>
>     The CGAL-BGL reading function returns false, so it means that the input
>     is not a valid manifold surface.
>
>     If you using the PMP function:
>
>     #include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
>     if (!CGAL::Polygon_mesh_processing::IO::read_polygon_mesh(filename,
>     polygon_mesh)) {
>     ...
>     }
>
>     some repair operations will be done to solve non-manifoldness (to the
>     price of adding duplicated simplices and thus self-intersections).
>
>     More details here:
>     https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__IO__grp.html#gac5b3295bd1b6375628a46d1fbaf7e881 <https://doc.cgal.org/latest/Polygon_mesh_processing/group__PMP__IO__grp.html#gac5b3295bd1b6375628a46d1fbaf7e881>
>
>     Sebastien.
>
>     On 8/28/23 08:54, Claus Volko (
>     <mailto:> via cgal-discuss
>     Mailing List) wrote:
>      > I used the attached program and got an error message.
>      >
>      > Am Mo., 28. Aug. 2023 um 08:48 Uhr schrieb Sebastien Loriot
>      > < <mailto:>
>     <mailto: <mailto:>>>:
>      >
>      >     I did not have any issue opening the shared file.
>      >     Could you please share a minimal example I can compile and
>     that shows
>      >     the error so that I can run on my side?
>      >
>      >     Best,
>      >
>      >     Sebastien.
>      >
>      >     On 8/28/23 08:28, Claus Volko (
>     <mailto:>
>      >     <mailto: <mailto:>> via
>     cgal-discuss
>      >     Mailing List) wrote:
>      >      > Yes, I uploaded it to:
>      >      > http://www.21stcenturyheadlines.com/temp/Scene_obj.zip
>     <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip>
>      >     <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip
>     <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip>>
>      >      > <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip
>     <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip>
>      >     <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip
>     <http://www.21stcenturyheadlines.com/temp/Scene_obj.zip>>>
>      >      >
>      >      > Am Mo., 28. Aug. 2023 um 08:06 Uhr schrieb Sebastien Loriot
>      >      > < <mailto:>
>     <mailto: <mailto:>>
>      >     <mailto: <mailto:>
>     <mailto: <mailto:>>>>:
>      >      >
>      >      >     Could you share such an obj file that CGAL cannot open?
>      >      >
>      >      >     Thanks,
>      >      >
>      >      >     Sebastien.
>      >      >
>      >      >     On 8/27/23 17:03, Claus Volko (
>     <mailto:>
>      >     <mailto: <mailto:>>
>      >      >     <mailto: <mailto:>
>     <mailto: <mailto:>>> via
>      >     cgal-discuss
>      >      >     Mailing List) wrote:
>      >      >      > We are trying to make OBJ files saved from Google
>     Maps HD
>      >     compatible
>      >      >      > with CGAL 5.6 for Shape Detection (Region Growing).
>     On opening
>      >      >     the OBJ
>      >      >      > file I get an error message that does not explain
>     what is
>      >     wrong, but
>      >      >      > after converting to OFF it is more verbose:
>      >      >      >
>      >      >      > CGAL::Polyhedron_incremental_builder_3<HDS>::
>      >      >      > lookup_halfedge(): input error: facet 49 shares a
>     halfedge
>      >     from
>      >      >     vertex
>      >      >      > 145 to vertex 146 with facet 48.
>      >      >      >
>      >      >      > Polyhedron_scan_OFF<Traits>::
>      >      >      > operator()(): input error: facet 50 has fewer than
>     3 vertices.
>      >      >      > ERROR: cannot read the input file!
>      >      >      >
>      >      >      > I wrote a short program in C# that should fix the
>     problem
>      >      >     (attached).
>      >      >      > However, the result is a file that is somewhat
>      >     degenerated: the
>      >      >     number
>      >      >      > of planes is equal to the number of faces. This
>     cannot be
>      >     used.
>      >      >      >
>      >      >      > Does anybody have an idea how else this could be fixed?
>      >      >      >
>      >      >      > --
>      >      >      > Dipl.-Ing. Dr. Claus D. Volko, BSc
>      >      >      > http://www.cdvolko.net/ <http://www.cdvolko.net/>
>     <http://www.cdvolko.net/ <http://www.cdvolko.net/>>
>      >     <http://www.cdvolko.net/ <http://www.cdvolko.net/>
>     <http://www.cdvolko.net/ <http://www.cdvolko.net/>>>
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>     <http://www.cdvolko.net/ <http://www.cdvolko.net/>>
>      >     <http://www.cdvolko.net/ <http://www.cdvolko.net/>
>     <http://www.cdvolko.net/ <http://www.cdvolko.net/>>>>
>      >      >      >
>      >      >      >
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>      >      >      >
>      >      >      > --
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>      >      >
>      >      > --
>      >      > Dipl.-Ing. Dr. Claus D. Volko, BSc
>      >      > http://www.cdvolko.net/ <http://www.cdvolko.net/>
>     <http://www.cdvolko.net/ <http://www.cdvolko.net/>>
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>      > Dipl.-Ing. Dr. Claus D. Volko, BSc
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>     <http://www.cdvolko.net/ <http://www.cdvolko.net/>>
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> Dipl.-Ing. Dr. Claus D. Volko, BSc
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Dipl.-Ing. Dr. Claus D. Volko, BSc
http://www.cdvolko.net/




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