CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

On 08/04/2014 11:44 PM, EnricoLop wrote:
> Hi, I am not very experienced with cgal. I am trying to implement a 3D map of
> a terrain with textures. Now i am checking for intersections on each image
> to see what image will be better on each triangle(surface is made of
> triangles).
>
> I tried following the examples on
> http://doc.cgal.org/latest/Kernel_23/group__intersection__linear__grp.html
> but my code is genarating some erros:
>
> /TextureManager.cpp:109: error: could not convert 'result' from
> 'CGAL::cpp11::result_of<CGAL::CommonKernelFunctors::Intersect_3&lt;CGAL::Cartesian&lt;double>
> > (CGAL::Triangle_3<CGAL::Cartesian&lt;double> >,
> CGAL::Triangle_3<CGAL::Cartesian&lt;double> >)>::type {aka CGAL::Object}' to
> 'bool'
>
> TextureManager.cpp:110: error: no match for 'operator*' (operand type is
> 'CGAL::cpp11::result_of<CGAL::CommonKernelFunctors::Intersect_3&lt;CGAL::Cartesian&lt;double>
> > (CGAL::Triangle_3<CGAL::Cartesian&lt;double> >,
> CGAL::Triangle_3<CGAL::Cartesian&lt;double> >)>::type {aka CGAL::Object}')
>
> this code :
>
>      struct Intersection_visitor {
>          typedef void result_type;
>          void operator()(const Point3 & p) const{
>              // handle point
>          }
>          void operator()(const Segment3 & s) const{
>          // handle segment
>          }
>          void operator()(const Triangle3 & t) const{
>              // handle point
>          }
>      };
>
>      CGAL::cpp11::result_of<tc::Intersect_3(Triangle3,Triangle3)>::type
> result =  CGAL::intersection(*t_3,*tLado1_3);
>      if(result) { // ERROR LINE
>      boost::apply_visitor(Intersection_visitor(), *result); // ERROR2 LINE
>      }
>      else { // empty
>      }
>
> These are the declarations:
>
> typedef CGAL::Cartesian<double> tc;
> typedef tc::Ray_3            Ray3;
> typedef tc::Line_3           Line3;
> typedef tc::Vector_3         Vector3;
> typedef tc::Point_3          Point3;
> typedef tc::Plane_3          Plane3;
> typedef tc::Triangle_3       Triangle3;
> typedef tc::Segment_3        Segment3;

I gave an answer here:
http://stackoverflow.com/questions/25123939/cgalintersection-error/25152543#25152543

Sebastien

> --
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> http://cgal-discuss.949826.n4.nabble.com/Trouble-using-intersection-on-triangle-intersections-tp4659679.html
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