CGAL users discussion list

[Manuel Caroli <>]

Dear 400555,

ok, in this case you might truncate your resulting mesh along the 
bounding box. But then you will be in trouble to sew two periodic copies 
of your mesh...
Another idea would be to have 27 copies of the periodic object arranged 
in a cube of 3x3x3 copies and pick the copy in the middle. However this 
will be considerably slower.
As I said we are currently working on making the CGAL surface mesher 
work for periodic surfaces. I'll contact you as soon as we have some 
results.

best

Manuel


400555 wrote:
> Dear Manuel,
>
> the point is that I want to make periodic surface. And making bounding 
> sphere which  contains my box (cube) is not a solution.
> With box - a can generate periodicity by connecting my boxes (facet to 
> facet) but with sphere it is not possible.
>
> Do you have any idea how can I do it with CGAL ? 
>
> On Sat, Aug 8, 2009 at 1:45 PM, Manuel Caroli 
> < <mailto:>> 
> wrote:
>
>     400555 wrote:
>
>         Thank you for quick answer Manuel!
>
>         The point is that Implicit_surface_3 has a second argument with
>         type Sphere_3:
>
>     Yes but as I understood you have a bounding box, right? So you can
>     get the size and position of the bounding box and create a Sphere_3
>     from it which contains the bounding box entirely. Followingly it is
>     a bounding sphere, which you can use as second argument to
>     Implicit_surface_3.
>
>     Manuel
>
>
>         Implicit_surface_3<Traits, Function> surface ( Function f,
>         Sphere_3
>         
> <http://www.cgal.org/Manual/3.4/doc_html/cgal_manual/Kernel_23_ref/Class_Sphere_3.html#Cross_link_anchor_251>
>         bounding_sphere, FT error_bound = FT(1e-3));
>         /
>         /
>
>
>         On Fri, Aug 7, 2009 at 5:09 PM, Manuel Caroli
>         
> <
>         
> <mailto:>
>         
> <mailto:
>         
> <mailto:>>>
>  wrote:
>
>            Hi 400555,
>
>
>            400555 wrote:
>
>                Hello everyone !
>
>                To make surface with Implicit_surface_3 necessary to set
>                Bounding Sphere.
>
>                Is any way to use Bounding Box instead of it?
>
>            I don't know the surface mesher very well, but if you have a
>            bounding box you couldn't you use a sphere bounding the
>         bounding box
>            as bounding sphere?
>
>
>                Also do you know last does CGAL version allow to make
>         periodic
>                surfaces?
>
>            There are periodic triangulations available. However they don't
>            (yet) work together with the surface mesher as they have a
>         slightly
>            different interface than the normal triangulations. We are
>         working
>            on it.
>
>            best
>
>            Manuel
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