CGAL users discussion list

[Nader Salman <>]

Hi Laurent,

i read Tina's code but culdn't answer yesterday.

Here are the quick remarks:

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
#include <CGAL/property_map.h>
#include <CGAL/IO/read_xyz_points.h>
#include <CGAL/grid_simplify_point_set.h>
#include <CGAL/property_map.h>

#include <vector>
#include <fstream>
#include <utility> // defines std::pair


 #include <list> // IMPORTANT : This method modifies the order of input
                         // points so as to pack all remaining points first,
                         // and returns an iterator over the first point to remove
                         // (see erase-remove idiom). For this reason it should not
                         // be called on sorted containers.

// types

// kernel
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;

// Simple geometric types
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;

// Point with normal vector stored in a std::pair.
typedef std::pair<Point, Vector> PointVectorPair;
typedef std::vector<PointVectorPair> PointList;

int main(void)
{

    PointList points; // Type of input point set

    // Reads a .xyz point set file in points[].
    // The Dereference_property_map property map can be omitted here as it is the default value.

    Bug std::list<PointVectorPair> points; // Check important notice higher and redefinition here...

        std::ifstream stream("../data/kitten.xyz");
    Bug CGAL::read_xyz_points// if you want to read the normals you should use the correct function
        if (!stream ||
            !CGAL::read_xyz_points_and_normals(stream, std::back_inserter(points),
            CGAL::First_of_pair_property_map<PointVectorPair>(),
            CGAL::Second_of_pair_property_map<PointVectorPair>()))
        {
            std::cerr << "Error: cannot read file data" << std::endl;
            return EXIT_FAILURE;
        }
        // simplification by clustering using erase-remove idiom
        double cell_size = 0.001;
        PointList::iterator unwanted_points_begin =
            CGAL::grid_simplify_point_set(points.begin(), points.end(),
            CGAL::First_of_pair_property_map<PointVectorPair>(), cell_size);

        // delete unwanted points
        points.erase(unwanted_points_begin , points.end());

        // Optional: after erase(), use Scott Meyer's "swap trick" to trim excess capacity
        PointList(points).swap(points);

        // Saves point set.
        // Note: write_xyz_points_and_normals() requires an output iterator
        // over points as well as property maps to access each
        // point position and normal.
        std::ofstream out("out_normal.xyz");
        if (!out ||
            !CGAL::write_xyz_points_and_normals(
            out, points.begin(), points.end(),
            CGAL::First_of_pair_property_map<PointVectorPair>(),
            CGAL::Second_of_pair_property_map<PointVectorPair>()))
        {
            return EXIT_FAILURE;
        }


        return EXIT_SUCCESS;
}

Cheers,
Nader S.

Laurent Saboret a écrit :

Hi Tina,

Could you please post your complete code, so we can try to reproduce the compilation error below.

Best regards,
Laurent Saboret


tina rumi wrote:

Hi Nad,

Thanks a lot for your help. I am getting another error when I am running your code. here is the error that I got:

1>Compiling...
1>cloud_points.cpp
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(61) : error C2039: 'x' : is not a member of 'std::pair<_Ty1,_Ty2>'
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>        c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(59) : while compiling class template member function 'bool CGAL::CGALi::Less_epsilon_points_3<Point_3>::operator ()(const Point_3 &,const Point_3 &) const'
1>        with
1>        [
1>            Point_3=Enriched_point
1>        ]
1>        c:\program files (x86)\microsoft visual studio 9.0\vc\include\set(48) : see reference to class template instantiation 'CGAL::CGALi::Less_epsilon_points_3<Point_3>' being compiled
1>        with
1>        [
1>            Point_3=Enriched_point
1>        ]
1>        c:\program files (x86)\microsoft visual studio 9.0\vc\include\xtree(22) : see reference to class template instantiation 'std::_Tset_traits<_Kty,_Pr,_Alloc,_Mfl>' being compiled
1>        with
1>        [
1>            _Kty=Enriched_point,
1>            _Pr=CGAL::CGALi::Less_epsilon_points_3<Enriched_point>,
1>            _Alloc=std::allocator<PointVectorPair>,
1>            _Mfl=false
1>        ]
1>        c:\program files (x86)\microsoft visual studio 9.0\vc\include\xtree(63) : see reference to class template instantiation 'std::_Tree_nod<_Traits>' being compiled
1>        with
1>        [
1>            _Traits=std::_Tset_traits<Enriched_point,CGAL::CGALi::Less_epsilon_points_3<Enriched_point>,std::allocator<PointVectorPair>,false>
1>        ]
1>        c:\program files (x86)\microsoft visual studio 9.0\vc\include\xtree(89) : see reference to class template instantiation 'std::_Tree_ptr<_Traits>' being compiled
1>        with
1>        [
1>            _Traits=std::_Tset_traits<Enriched_point,CGAL::CGALi::Less_epsilon_points_3<Enriched_point>,std::allocator<PointVectorPair>,false>
1>        ]
1>        c:\program files (x86)\microsoft visual studio 9.0\vc\include\xtree(107) : see reference to class template instantiation 'std::_Tree_val<_Traits>' being compiled
1>        with
1>        [
1>            _Traits=std::_Tset_traits<Enriched_point,CGAL::CGALi::Less_epsilon_points_3<Enriched_point>,std::allocator<PointVectorPair>,false>
1>        ]
1>        c:\program files (x86)\microsoft visual studio 9.0\vc\include\set(57) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled
1>        with
1>        [
1>            _Traits=std::_Tset_traits<Enriched_point,CGAL::CGALi::Less_epsilon_points_3<Enriched_point>,std::allocator<PointVectorPair>,false>
1>        ]
1>        c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(99) : see reference to class template instantiation 'std::set<_Kty,_Pr>' being compiled
1>        with
1>        [
1>            _Kty=Enriched_point,
1>            _Pr=CGAL::CGALi::Less_epsilon_points_3<Enriched_point>
1>        ]
1>        c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(154) : see reference to class template instantiation 'CGAL::Epsilon_point_set_3<Point_3>' being compiled
1>        with
1>        [
1>            Point_3=Enriched_point
1>        ]
1>        c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(190) : see reference to function template instantiation 'ForwardIterator CGAL::grid_simplify_point_set<ForwardIterator,PointPMap,CGAL::Filtered_kernel<CK>>(ForwardIterator,ForwardIterator,PointPMap,double,const Kernel &)' being compiled
1>        with
1>        [
1>            ForwardIterator=std::_Vector_iterator<PointVectorPair,std::allocator<PointVectorPair>>,
1>            PointPMap=CGAL::First_of_pair_property_map<PointVectorPair>,
1>            CK=CGAL::Simple_cartesian<double>,
1>            Kernel=CGAL::Filtered_kernel<CGAL::Simple_cartesian<double>>
1>        ]
1>        f:\fingerprint\codes\cloud_points\cloud_points\cloud_points.cpp(203) : see reference to function template instantiation 'ForwardIterator CGAL::grid_simplify_point_set<std::_Vector_iterator<_Ty,_Alloc>,CGAL::First_of_pair_property_map<Pair>>(ForwardIterator,ForwardIterator,PointPMap,double)' being compiled
1>        with
1>        [
1>            ForwardIterator=std::_Vector_iterator<PointVectorPair,std::allocator<PointVectorPair>>,
1>            _Ty=PointVectorPair,
1>            _Alloc=std::allocator<PointVectorPair>,
1>            Pair=PointVectorPair,
1>            PointPMap=CGAL::First_of_pair_property_map<PointVectorPair>
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(62) : error C2039: 'y' : is not a member of 'std::pair<_Ty1,_Ty2>'
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(63) : error C2039: 'z' : is not a member of 'std::pair<_Ty1,_Ty2>'
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(63) : error C2661: 'std::pair<_Ty1,_Ty2>::pair' : no overloaded function takes 3 arguments
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(64) : error C2039: 'x' : is not a member of 'std::pair<_Ty1,_Ty2>'
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(65) : error C2039: 'y' : is not a member of 'std::pair<_Ty1,_Ty2>'
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(66) : error C2039: 'z' : is not a member of 'std::pair<_Ty1,_Ty2>'
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>c:\cgal\cgal-3.5\include\cgal\grid_simplify_point_set.h(66) : error C2661: 'std::pair<_Ty1,_Ty2>::pair' : no overloaded function takes 3 arguments
1>        with
1>        [
1>            _Ty1=Point,
1>            _Ty2=Vector
1>        ]
1>Build log was saved at "file://f:\fingerprint\codes\cloud_points\cloud_points\Debug\BuildLog.htm"
1>cloud_points - 8 error(s), 0 warning(s)
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========


Thank you,
Tina

On Tue, Dec 8, 2009 at 12:57 PM, Nader SALMAN <> wrote:

A correction , here you go :

// kernel
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;

// Simple geometric types
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;

// Point with normal vector stored in a std::pair.
typedef std::pair<Point, Vector> PointVectorPair;
typedef std::vector<PointVectorPair> PointList;

PointList points // Type of input point set

// simplification by clustering using erase-remove idiom

double cell_size = 0.001;

PointList::iterator unwanted_points_begin = CGAL::grid_simplify_point_set(points.begin(), points.end(), CGAL::First_of_pair_property_map<PointVectorPair>(), cell_size);

// delete unwanted points
points.erase(unwanted_points_begin , points.end());

// Optional: after erase(), use Scott Meyer's "swap trick" to trim excess capacity

PointList(points).swap(points);

Sorry for the earlier message,

Cheers,
Nad.

Nader SALMAN
    

Nader SALMAN a écrit :

Hi Tina,

thank you for your interest in CGAl and for using the PSP package.

here is how you should do it in general :

// kernel
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;

// Simple geometric types
typedef Kernel::FT FT;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;

// Point with normal vector stored in a std::pair.
typedef std::pair<Point, Vector> PointVectorPair;
typedef std::vector<PointVectorPair> PointList;

CGAL::grid_simplify_point_set(points.begin(), points.end(),
                                               CGAL::First_of_pair_property_map<PointVectorPair>(),
                                               cell_size);


in your case it would be :

 // simplification by clustering using erase-remove idiom
  double cell_size = 0.001;

  points.erase(CGAL::grid_simplify_point_set(points.begin(), points.end(),                                CGAL::First_of_pair_property_map<PointVectorPair>(), cell_size), points.end());

  // Optional: after erase(), use Scott Meyer's "swap trick" to trim excess capacity
  std::vector<Point>(points).swap(points);

Hope this helped!

Cheers,
Nad.

Nader SALMAN
Geometrica Lab, Byron Y308
INRIA Sophia Antipolis (FRANCE)

Tel: +33(0)4 9238 7161   Fax: +33(0)4 9715 5395   


http://www-sop.inria.fr/members/Nader.Salman

tina rumi a écrit :

Hi all,

I am trying to use following function:

points.erase(CGAL::grid_simplify_point_set(points.begin(), points.end(), cell_size),
               points.end());



the type that I am using for points is :

// types
typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
typedef Kernel::Point_3 Point;
typedef Kernel::Vector_3 Vector;

// Point with normal vector stored in a std::pair.
typedef std::pair<Point, Vector> PointVectorPair;

std::list<PointVectorPair> points;

but it caused error. I want to keep this type for points. Do you have any suggestion to fix it.

Thank you,
Tina

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