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Re: [cgal-discuss] Convex Hull 3D problem


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  • From: Sylvain Pion <>
  • To:
  • Subject: Re: [cgal-discuss] Convex Hull 3D problem
  • Date: Sat, 29 Nov 2008 15:13:58 +0100
  • Organization: INRIA

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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