CGAL users discussion list

["Laurent Rineau (CGAL/GeometryFactory)" <>]

Le dimanche 09 décembre 2012 11:30:26 Noel Warren a écrit :
> I need to import a series of models from Sketchup into CGAL.  Up to now
> I've been using the Sketchup API and a simple little script to triangulate
> faces which I then use to create an OFF file and build my CGAL Polyhedron.
>  The problem is the Sketchup API uses floats and ocasionally creates
> degenerate OFF files.  (This usually happens when I have two rectangular
> holes on a face that are closely lined up)
> 
> The Sketchup model uses a structure very similar to that of CGAL with
> half_facets, half_edges, loops, etc.  My question is, could I construct a
> Polyhedron from this type of data structure directly?  If so how would I go
> about doing so.

You should the polyhedron incremental builder. That is an API to construct an 
halfedges datastructure from scratch, using points and indices. See the 
documentation, with a (too simple) example:

http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Polyhedron_ref/Class_Polyhedron_incremental_builder_3.html


-- 
Laurent Rineau, PhD
R&D Engineer at GeometryFactory           http://www.geometryfactory.com/
Release Manager of the CGAL Project       http://www.cgal.org/