CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

You can define a polyhedron with several connected components. Note that
you could not directly have access to the different components
To do this you only need to do one begin/end_surface.

I guess you simply need to translate the indices of your points by the 
number of already inserted points.

S.

johnzjq wrote:
> Dear All,
>
> I would like to read several solids in a .obj file to Polyhedron_3 data
> structure. 
>
> Question 1: Can I use one Polyhedron_3 to record all these solids? or for
> each solid, I should define its own Polyhedron_3 object?
>
> Question 2: How to use ABSOLUTE_INDEXING mode in the incremental_builder? I
> read the manual but still a little confused: "...the incremental builder
> uses absolute indexing and the vertices of the old polyhedral surface can be
> used in new facets." Does that mean I can use begin_surface() to start a new
> surface just after the last call of end_surface()? Something like:
> -------------------------------------------------------
> Builder pB(hds, true);
> //1
> pB.begin_surface()
> ...
> pB.end_surface()
> //2
> pB.begin_surface()
> ...
> pB.end_surface()
> --------------------------------------------------------
> It seems the new surface overwrite the old one, isn't it?
>
> Any ideas? Thanks in advance.
>
> John