Question

我希望访问CGAL多面体顶点的x，y，z值。

我找到的最近的代码就是这个

// polyhedron_prog_tetra.C
// -----------------------------------------------------------
#include <CGAL/Cartesian.h>
#include <iostream>
#include <CGAL/Halfedge_data_structure_polyhedron_default_3.h>
#include <CGAL/Polyhedron_default_traits_3.h>
#include <CGAL/Polyhedron_3.h>

typedef CGAL::Cartesian<double>                               R;
typedef CGAL::Halfedge_data_structure_polyhedron_default_3<R> HDS;
typedef CGAL::Polyhedron_default_traits_3<R>                  Traits;
typedef CGAL::Polyhedron_3<Traits,HDS>                        Polyhedron;
typedef Polyhedron::Point                                     Point;
typedef Polyhedron::Vertex_iterator                           Vertex_iterator;

int main() {
    Point p( 1.0, 0.0, 0.0);
    Point q( 0.0, 1.0, 0.0);
    Point r( 0.0, 0.0, 1.0);
    Point s( 0.0, 0.0, 0.0);

 Polyhedron P;
 P.make_tetrahedron( p, q, r, s);
 CGAL::set_ascii_mode( std::cout);
 Vertex_iterator begin = P.vertices_begin();
 for ( ; begin != P.vertices_end(); ++begin)
     std::cout << "(" << begin->point() << ") ";
    std::cout << std::endl;
 return 0;
 }

But when I try and compile I get a errors
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:60: error: expected initializer before ‘<’ token
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:61: error: expected initializer before ‘<’ token
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:62: error: ‘Traits’ was not declared in this scope
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:62: error: ‘HDS’ was not declared in this scope
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:62: error: template argument 1 is invalid
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:62: error: template argument 2 is invalid
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:62: error: invalid type in declaration before ‘;’ token
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:63: error: ‘Polyhedron’ is not a class type
/usr/lib/freecad/Mod/OpenSCAD/CGAL/CallCGAL.cpp:63: error: ‘Polyhedron’ is not a class type

这个系统说我必须添加更多评论，所以这里有一些无意义的评论

Answer 1

认为我在互联网上尝试的版本已经过时了。在examples目录中找到了非常相似但不同的代码，这个工作正常。

Answer 2

你可以试试这些类型：

typedef CGAL::Cartesian< double > Kernel;
typedef Kernel::Vector_3  Vector;
typedef Kernel::Point_3  Point;
typedef CGAL::Polyhedron_3< Kernel > Polyhedron;
typedef Polyhedron::Vertex  Vertex;
typedef Polyhedron::Vertex_iterator  Vertex_iterator;

试图访问CGAL多面体顶点

2 个答案: