CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

Time4Breakfast wrote:
> I don't want to have a polyhedron that is invalid, but I'm looking for a
> solution to load data, that forms an invalid polyhedron into my program.
> The scan data is loadable with all of the standard 3D programs, e.g.
> meshlab, 3ds max, ... So there has to be a way to load and display the data.
Sure, but you'll agree that there is a difference between building a
valid Polyhedron_3 representing a manifold and loading a soup of
triangles for display.

> How can I catch the exception, that is thrown by CGAL, if an erroneous
> face/halfedge is found and tell CGAL to ignore it (or do something else) in
> order to create a valid polyhedron in the end?
You should not try catching those exceptions, because as I said you will
end up with an invalid data-structure that you'll try to make valid
afterward (and the public API will probably not be sufficient to do it).
Instead you should do the fixing inside the modifier by using test_facet
function for example.
See here:
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Polyhedron_ref/Class_Polyhedron_incremental_builder_3.html



Sebastien.


> The difficulty I see with off format is the huge amount of ply files
> (several hundreds) I have to work with. I think it is easier to solve the
> loading problem, than to convert all my files into off.
>
> Greetings
> time4breakfast
>
> --
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