CGAL users discussion list

[Andreas Fabri <>]

Hi Hayden,

I had a look at your "point clouds".  The advancing front reconstruction 
algorithm is
not adapted to this as the points describe a 3D  object for our eyes  
and brain,
but not for an algorithm that expects points to be on a surface.

I will take the discussion offline, and we can post a conclusion later.

Best,

Andreas

On 3/14/2021 10:07 PM, HDYNE ( via 
cgal-discuss Mailing List) wrote:
> Hi all,
>
> I am developing a dedicated cad application for sheet metal processing; I am
> taking a DXF and discretizing it (lines, arcs and circles) to a point cloud.
> The aim is to build a 3D model where several operations can be performed
> including folding (ideally using the Triangulated Surface Mesh Deformation
> https://doc.cgal.org/latest/Surface_mesh_deformation/index.html).
>
> I am currently using the advancing front surface reconstruction algorithm to
> build my 3D mesh
> (https://doc.cgal.org/latest/Advancing_front_surface_reconstruction/index.html),
> however this fails (the mesh is far from correct) as soon as the part that I
> am meshing is more complicated than just a square. I have read the paper
> discussing this algorithm and they introduce the idea of planar, crease and
> corner points. I was wondering how do I go about specifying a point to be a
> crease? Since the DXF is a cut file, every point generated by the
> discretization will be a crease and I am hoping that specifying this will
> generate much more ideal results. The model doesn't have to be perfect as
> this is simply a representation, the output file will be a modified DXF.
>
> I would also like the output to work with the triangulated mesh deformation
> as this is the next step in this application.
>
> Any help would be much appreciated, or any suggestions for another way that
> I can build a 3D model from a DXF would be of great help also.
>
> I have attached some test files that have discretized:
>
> hard_dxf.xyz
> <http://cgal-discuss.949826.n4.nabble.com/file/t376291/hard_dxf.xyz>
> medium_dxf.xyz
> <http://cgal-discuss.949826.n4.nabble.com/file/t376291/medium_dxf.xyz>
> easy_dxf.xyz
> <http://cgal-discuss.949826.n4.nabble.com/file/t376291/easy_dxf.xyz>
>
> Many regards,
>
> Cheers, Hayden.
>
>
>
> --
> Sent from: http://cgal-discuss.949826.n4.nabble.com/
--
Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project