CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

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].

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.