CGAL users discussion list

[Simon Giraudot <>]

Hello,

Can you share the header of the generated PLY? I have no idea how 
Blender handles colors with PLY input, but it's possible the format you 
use is not recognized (I guess the usual way is to have 3 properties 
unsigned char "red" "green" and "blue", or "r" "g" and "b"). Do your 
colors appear if you try to load it in Meshlab?

For information, one easy way to save a mesh in PLY with colors is to 
use a CGAL::Surface_mesh instead of a CGAL::Polyhedron_3 (algorithms in 
CGAL should be compatible with both): in that case, you can embed the 
colors as properties on the mesh simplices, and these properties are 
automatically written if you call `CGAL::write_ply` on your mesh: 
https://doc.cgal.org/latest/Surface_mesh/group__PkgSurface__mesh.html#ga77bbb79d449c981895eedb6c3c23bd14

Best,

--
Simon Giraudot, PhD
R&D Engineer
GeometryFactory - http://geometryfactory.com/

Le 09/02/2021 à 21:14, Anisa-Aisha ( 
via cgal-discuss Mailing List) a écrit :
> Hello,
>
> I am a beginner in CGAL, and have been trying to export a PLY file with
> color information in CGAL. However, even though the colors are written in
> file, they are not displayed when I try to visualize it using Blender. I am
> using a Polyhedron_3 structure, and then using iterators to write to PLY
> file like it is done here (
> https://piero.dev/2017/04/how-to-write-a-cgal-polyhedron-to-ply-or-any-other-format/
> <https://piero.dev/2017/04/how-to-write-a-cgal-polyhedron-to-ply-or-any-other-format/>
> ), with addition of color property. Could anyone guide me on how to export
> PLY files in CGAL using Polyhedron_3 with color information?
> Thank you.
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/