CGAL users discussion list

[Monique Teillaud <>]

Le 14/05/13 17:40, Sebastien Loriot (GeometryFactory) a écrit :
> On 05/14/2013 05:13 PM, mriem wrote:
> > Hello
> >
> > I was looking into the CGAL intersections utilities at
> >
> > http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Kernel_23_ref/Function_intersection.html
> >
> >
> > and I could not find a segment_3 sphere intersection.
> It is inside "With the 3D Spherical Kernel", because you need a Kernel
> which is a Spherical_kernel [1].

you can still find it as global function CGAL::intersection
http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Kernel_23_ref/Function_intersection.html
scroll to bottom: "With the 3D Spherical Kernel"
intersection of a Line_arc_3 (more general than Segment_3) and a Sphere_3

        Monique

> Sebastien.
>
> [1]
> http://www.cgal.org/Manual/latest/doc_html/cgal_manual/Circular_kernel_3/Chapter_main.html#chapter-spherical-kernel
>
>
> > I have tried to implement the example code from that page
> >
> >
> > #include<CGAL/intersections.h>
> >
> > void foo(CGAL::Segment_2<Kernel>  seg, CGAL::Line_2<Kernel>  line)
> > {
> >      CGAL::Object result = CGAL::intersection(seg, line);
> >      if (const CGAL::Point_2<Kernel>  *ipoint =
> > CGAL::object_cast<CGAL::Point_2&lt;Kernel>  >(&result)) {
> >          // handle the point intersection case with *ipoint.
> >      } else
> >          if (const CGAL::Segment_2<Kernel>  *iseg =
> > CGAL::object_cast<CGAL::Segment_2&lt;Kernel>  >(&result)) {
> >              // handle the segment intersection case with *iseg.
> >          } else {
> >              // handle the no intersection case.
> >          }
> > }
> >
> > changing function arguments
> >
> > seg to type
> >
> > CGAL::Segment_3<Kernel>
> >
> > and line to
> > CGAL::Sphere_3<Kernel>
> >
> > but the linker complains there is no such specialization for that
> > templated
> > function.
> >
> > Can I do segment_3 to sphere intersection?
> >
> > Thank you very much.
> >
> > Miguel Oliveira
> >
> > PS: in fact, for this particular case, I only needed a do_intersect
> > functionality, but I think that if a do_intersect exists, so will the
> > intersect.
> >
> >
> >
> >
> >
> > --
> > View this message in context:
> > http://cgal-discuss.949826.n4.nabble.com/segment-3-sphere-intersection-tp4657426.html
> >
> > Sent from the cgal-discuss mailing list archive at Nabble.com.


--
Monique Teillaud
http://www.inria.fr/sophia/members/Monique.Teillaud/
INRIA Sophia Antipolis - Méditerranée
Institut National de Recherche en Informatique et Automatique