CGAL users discussion list

[Sylvain Pion <>]

This was due to a poor choice of kernel in the example program.
This has been fixed since 3.3.1.  Find attached the updated example
program as you will find it in the next CGAL release.

Chaman Singh Verma wrote:
> Hello,
>
> I was trying to execute the sample example of ConvexHull in 3D from:
>
> *File: *examples/Convex_hull_3/quickhull_3.cpp
>
>  <http://www.cgal.org/Manual/3.3/examples/Convex_hull_3/quickhull_3.cpp>
>
> and it produces the following message.  What are these and how can I get 
> rid of
> them ?
>
> Thanks.
> csv
> Poona, India
>
>
> CGAL warning: check violation!
> Expr: is_integer(d)
> File: /home/csv610/Software/CompGeom/CGAL/include/CGAL/GMP/Gmpz_type.h
> Line: 100
> Explanation:Gmpz constructed from non-integer double value
> CGAL warning: check violation!
> Expr: is_integer(d)
> File: /home/csv610/Software/CompGeom/CGAL/include/CGAL/GMP/Gmpz_type.h
> Line: 100
> Explanation:Gmpz constructed from non-integer double value
> CGAL warning: check violation!
> Expr: is_integer(d)
> File: /home/csv610/Software/CompGeom/CGAL/include/CGAL/GMP/Gmpz_type.h
> Line: 100
> Explanation:Gmpz constructed from non-integer double value
> CGAL warning: check violation!
> Expr: is_integer(d)


--
Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/
#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/point_generators_3.h>
#include <CGAL/algorithm.h>
#include <CGAL/Convex_hull_traits_3.h>
#include <CGAL/convex_hull_3.h>
#include <vector>


typedef CGAL::Exact_predicates_inexact_constructions_kernel  K;
typedef CGAL::Convex_hull_traits_3<K>             Traits;
typedef Traits::Polyhedron_3                      Polyhedron_3;
typedef K::Segment_3                              Segment_3;

// define point creator
typedef K::Point_3                                Point_3;
typedef CGAL::Creator_uniform_3<double, Point_3>  PointCreator;


int main()
{
  CGAL::Random_points_in_sphere_3<Point_3, PointCreator> gen(100.0);

  // generate 250 points randomly on a sphere of radius 100.0
  // and copy them to a vector
  std::vector<Point_3> points;
  CGAL::copy_n( gen, 250, std::back_inserter(points) );

  // define object to hold convex hull
  CGAL::Object ch_object;

  // compute convex hull
  CGAL::convex_hull_3(points.begin(), points.end(), ch_object);

  // determine what kind of object it is
  if (CGAL::object_cast<Segment_3>(&ch_object) )
     std::cout << "convex hull is a segment " << std::endl;
  else if (CGAL::object_cast<Polyhedron_3>(&ch_object) )
     std::cout << "convex hull is a polyhedron " << std::endl;
  else
     std::cout << "convex hull error!" << std::endl;

  return 0;
}

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