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dust3d/thirdparty/cgal/CGAL-4.13/include/CGAL/Nef_3/OGL_helper.h

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// Copyright (c) 1997-2002 Max-Planck-Institute Saarbruecken (Germany).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// SPDX-License-Identifier: GPL-3.0+
//
//
// Author(s) : Peter Hachenberger <hachenberger@mpi-sb.mpg.de>
#ifndef CGAL_NEF_OPENGL_HELPER_H
#define CGAL_NEF_OPENGL_HELPER_H
#include <CGAL/license/Nef_3.h>
#include <CGAL/Nef_S2/OGL_base_object.h>
#include <CGAL/Simple_cartesian.h>
#include <CGAL/Nef_3/SNC_decorator.h>
#include <qgl.h>
#include <CGAL/glu.h>
#include <cstdlib>
#define CGAL_NEF3_MARKED_VERTEX_COLOR 183,232,92
#define CGAL_NEF3_MARKED_EDGE_COLOR 171,216,86
#define CGAL_NEF3_MARKED_FACET_COLOR 157,203,81
#define CGAL_NEF3_UNMARKED_VERTEX_COLOR 255,246,124
#define CGAL_NEF3_UNMARKED_EDGE_COLOR 255,236,94
#define CGAL_NEF3_UNMARKED_FACET_COLOR 249,215,44
#ifdef _WIN32
#define CGAL_GLU_TESS_CALLBACK CALLBACK
#else
#define CGAL_GLU_TESS_CALLBACK
#endif
#ifdef __APPLE__
# include <AvailabilityMacros.h>
#endif
#if defined __APPLE__ && !defined MAC_OS_X_VERSION_10_5
#define CGAL_GLU_TESS_DOTS ...
#else
#define CGAL_GLU_TESS_DOTS
#endif
namespace CGAL {
namespace OGL {
// ----------------------------------------------------------------------------
// Drawable double types:
// ----------------------------------------------------------------------------
typedef CGAL::Simple_cartesian<double> DKernel;
typedef DKernel::Point_3 Double_point;
typedef DKernel::Vector_3 Double_vector;
typedef DKernel::Segment_3 Double_segment;
typedef DKernel::Aff_transformation_3 Affine_3;
// DPoint = a double point including a mark
class DPoint : public Double_point {
bool m_;
public:
DPoint() {}
DPoint(const Double_point& p, bool m) : Double_point(p) { m_ = m; }
DPoint(const DPoint& p) : Double_point(p) { m_ = p.m_; }
DPoint& operator=(const DPoint& p)
{ Double_point::operator=(p); m_ = p.m_; return *this; }
bool mark() const { return m_; }
};
// DSegment = a double segment including a mark
class DSegment : public Double_segment {
bool m_;
public:
DSegment() {}
DSegment(const Double_segment& s, bool m) : Double_segment(s) { m_ = m; }
DSegment(const DSegment& s) : Double_segment(s) { m_ = s.m_; }
DSegment& operator=(const DSegment& s)
{ Double_segment::operator=(s); m_ = s.m_; return *this; }
bool mark() const { return m_; }
};
// Double_triple = a class that stores a triple of double
// coordinates; we need a pointer to the coordinates in a C array
// for OpenGL
class Double_triple {
typedef double* double_ptr;
typedef const double* const_double_ptr;
double coords_[3];
public:
Double_triple()
{ coords_[0]=coords_[1]=coords_[2]=0.0; }
Double_triple(double x, double y, double z)
{ coords_[0]=x; coords_[1]=y; coords_[2]=z; }
Double_triple(const Double_triple& t)
{ coords_[0]=t.coords_[0];
coords_[1]=t.coords_[1];
coords_[2]=t.coords_[2];
}
Double_triple& operator=(const Double_triple& t)
{ coords_[0]=t.coords_[0];
coords_[1]=t.coords_[1];
coords_[2]=t.coords_[2];
return *this; }
operator double_ptr() const
{ return const_cast<Double_triple&>(*this).coords_; }
double operator[](unsigned i)
{ CGAL_assertion(i<3); return coords_[i]; }
}; // Double_triple
static std::ostream& operator << (std::ostream& os,
const Double_triple& t)
{ os << "(" << t[0] << "," << t[1] << "," << t[2] << ")";
return os; }
// DFacet stores the facet cycle vertices in a continuus C array
// of three double components, this is necessary due to the OpenGL
// tesselator input format !
class DFacet {
typedef std::vector<Double_triple> Coord_vector;
typedef std::vector<unsigned> Cycle_vector;
Coord_vector coords_; // stores all vertex coordinates
Cycle_vector fc_ends_; // stores entry points of facet cycles
Double_triple normal_; // stores normal and mark of facet
bool mark_;
public:
typedef Coord_vector::iterator Coord_iterator;
typedef Coord_vector::const_iterator Coord_const_iterator;
DFacet() {}
void push_back_vertex(double x, double y, double z)
{ coords_.push_back(Double_triple(x,y,z)); }
DFacet(const DFacet& f)
{ coords_ = f.coords_;
fc_ends_ = f.fc_ends_;
normal_ = f.normal_;
mark_ = f.mark_;
}
DFacet& operator=(const DFacet& f)
{ coords_ = f.coords_;
fc_ends_ = f.fc_ends_;
normal_ = f.normal_;
mark_ = f.mark_;
return *this;
}
~DFacet()
{ coords_.clear(); fc_ends_.clear(); }
void push_back_vertex(const Double_point& p)
{ push_back_vertex(p.x(),p.y(),p.z()); }
void set_normal(double x, double y, double z, bool m)
{ double l = sqrt(x*x + y*y + z*z);
normal_ = Double_triple(x/l,y/l,z/l); mark_ = m; }
double dx() const { return normal_[0]; }
double dy() const { return normal_[1]; }
double dz() const { return normal_[2]; }
bool mark() const { return mark_; }
double* normal() const
{ return static_cast<double*>(normal_); }
void new_facet_cycle()
{ fc_ends_.push_back((unsigned)coords_.size()); }
unsigned number_of_facet_cycles() const
{ return (unsigned)fc_ends_.size(); }
Coord_iterator facet_cycle_begin(unsigned i)
{ CGAL_assertion(i<number_of_facet_cycles());
if (i==0) return coords_.begin();
else return coords_.begin()+fc_ends_[i]; }
Coord_iterator facet_cycle_end(unsigned i)
{ CGAL_assertion(i<number_of_facet_cycles());
if (i<fc_ends_.size()-1) return coords_.begin()+fc_ends_[i+1];
else return coords_.end(); }
Coord_const_iterator facet_cycle_begin(unsigned i) const
{ CGAL_assertion(i<number_of_facet_cycles());
if (i==0) return coords_.begin();
else return coords_.begin()+fc_ends_[i]; }
Coord_const_iterator facet_cycle_end(unsigned i) const
{ CGAL_assertion(i<number_of_facet_cycles());
if (i<fc_ends_.size()-1) return coords_.begin()+fc_ends_[i+1];
else return coords_.end(); }
void debug(std::ostream& os = std::cerr) const
{ os << "DFacet, normal=" << normal_ << ", mark=" << mark() << std::endl;
for(unsigned i=0; i<number_of_facet_cycles(); ++i) {
os << " facet cycle ";
// put all vertices in facet cycle into contour:
Coord_const_iterator cit;
for(cit = facet_cycle_begin(i); cit != facet_cycle_end(i); ++cit)
os << *cit;
os << std::endl;
}
}
}; // DFacet
// ----------------------------------------------------------------------------
// OGL Drawable Polyhedron:
// ----------------------------------------------------------------------------
inline void CGAL_GLU_TESS_CALLBACK beginCallback(GLenum which)
{ glBegin(which); }
inline void CGAL_GLU_TESS_CALLBACK endCallback(void)
{ glEnd(); }
inline void CGAL_GLU_TESS_CALLBACK errorCallback(GLenum errorCode)
{ const GLubyte *estring;
estring = gluErrorString(errorCode);
fprintf(stderr, "Tessellation Error: %s\n", estring);
std::exit (0);
}
inline void CGAL_GLU_TESS_CALLBACK vertexCallback(GLvoid* vertex,
GLvoid* user)
{ GLdouble* pc(static_cast<GLdouble*>(vertex));
GLdouble* pu(static_cast<GLdouble*>(user));
// CGAL_NEF_TRACEN("vertexCallback coord "<<pc[0]<<","<<pc[1]<<","<<pc[2]);
// CGAL_NEF_TRACEN("vertexCallback normal "<<pu[0]<<","<<pu[1]<<","<<pu[2]);
glNormal3dv(pu);
glVertex3dv(pc);
}
enum { SNC_AXES};
enum { SNC_BOUNDARY, SNC_SKELETON };
class Polyhedron : public OGL_base_object {
std::list<DPoint> vertices_;
std::list<DSegment> edges_;
std::list<DFacet> halffacets_;
GLuint object_list_;
bool init_;
Bbox_3 bbox_;
int style;
std::vector<bool> switches;
typedef std::list<DPoint>::const_iterator Vertex_iterator;
typedef std::list<DSegment>::const_iterator Edge_iterator;
typedef std::list<DFacet>::const_iterator Halffacet_iterator;
public:
Polyhedron() : bbox_(-1,-1,-1,1,1,1), switches(1) {
object_list_ = 0;
init_ = false;
style = SNC_BOUNDARY;
switches[SNC_AXES] = false;
}
/*
Polyhedron(const Polyhedron& P) :
object_list_(0),
init_(false),
bbox_(P.bbox_),
style(P.style),
switches(2) {
switches[SNC_AXES] = P.switches[SNC_AXES];
Vertex_iterator v;
for(v=P.vertices_.begin();v!=P.vertices_.end();++v)
vertices_.push_back(*v);
Edge_iterator e;
for(e=P.edges_.begin();e!=P.edges_.end();++e)
edges_.push_back(*e);
Halffacet_iterator f;
for(f=P.halffacets_.begin();f!=P.halffacets_.end();++f)
halffacets_.push_back(*f);
}
Polyhedron& operator=(const Polyhedron& P) {
if (object_list_) glDeleteLists(object_list_, 4);
object_list_ = 0;
init_ = false;
style = P.style;
switches[SNC_AXES] = P.switches[SNC_AXES];
Vertex_iterator v;
vertices_.clear();
for(v=P.vertices_.begin();v!=P.vertices_.end();++v)
vertices_.push_back(*v);
Edge_iterator e;
edges_.clear();
for(e=P.edges_.begin();e!=P.edges_.end();++e)
edges_.push_back(*e);
Halffacet_iterator f;
halffacets_.clear();
for(f=P.halffacets_.begin();f!=P.halffacets_.end();++f)
halffacets_.push_back(*f);
init();
return *this;
}
*/
~Polyhedron()
{ if (object_list_) glDeleteLists(object_list_, 4); }
void push_back(const Double_point& p, bool m) {
vertices_.push_back(DPoint(p,m));
}
void push_back(const Double_segment& s, bool m)
{ edges_.push_back(DSegment(s,m)); }
void push_back(const DFacet& f)
{ halffacets_.push_back(f); }
void toggle(int index) {
switches[index] = !switches[index];
}
void set_style(int index) {
style = index;
}
bool is_initialized() const { return init_; }
Bbox_3 bbox() const { return bbox_; }
Bbox_3& bbox() { return bbox_; }
void draw(Vertex_iterator v) const {
// CGAL_NEF_TRACEN("drawing vertex "<<*v);
CGAL::Color cf(CGAL_NEF3_MARKED_VERTEX_COLOR),
ct(CGAL_NEF3_UNMARKED_VERTEX_COLOR); // more blue-ish
CGAL::Color c = v->mark() ? ct : cf;
glPointSize(10);
glColor3ub(c.red(), c.green(), c.blue());
glBegin(GL_POINTS);
glVertex3d(v->x(),v->y(),v->z());
#ifdef CGAL_NEF_EMPHASIZE_VERTEX
glColor3ub(255,0,0);
glVertex3d(CGAL_NEF_EMPHASIZE_VERTEX);
#endif
glEnd();
}
void draw(Edge_iterator e) const {
// CGAL_NEF_TRACEN("drawing edge "<<*e);
Double_point p = e->source(), q = e->target();
CGAL::Color cf(CGAL_NEF3_MARKED_EDGE_COLOR),
ct(CGAL_NEF3_UNMARKED_EDGE_COLOR); // more blue-ish
CGAL::Color c = e->mark() ? ct : cf;
glLineWidth(5);
glColor3ub(c.red(),c.green(),c.blue());
glBegin(GL_LINE_STRIP);
glVertex3d(p.x(), p.y(), p.z());
glVertex3d(q.x(), q.y(), q.z());
glEnd();
}
void draw(Halffacet_iterator f) const {
// CGAL_NEF_TRACEN("drawing facet "<<(f->debug(),""));
GLUtesselator* tess_ = gluNewTess();
gluTessCallback(tess_, GLenum(GLU_TESS_VERTEX_DATA),
(GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &vertexCallback);
gluTessCallback(tess_, GLenum(GLU_TESS_BEGIN),
(GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &beginCallback);
gluTessCallback(tess_, GLenum(GLU_TESS_END),
(GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &endCallback);
gluTessCallback(tess_, GLenum(GLU_TESS_ERROR),
(GLvoid (CGAL_GLU_TESS_CALLBACK *)(CGAL_GLU_TESS_DOTS)) &errorCallback);
gluTessProperty(tess_, GLenum(GLU_TESS_WINDING_RULE),
GLU_TESS_WINDING_POSITIVE);
DFacet::Coord_const_iterator cit;
CGAL::Color cf(CGAL_NEF3_MARKED_FACET_COLOR),
ct(CGAL_NEF3_UNMARKED_FACET_COLOR); // more blue-ish
CGAL::Color c = (f->mark() ? ct : cf);
glColor3ub(c.red(),c.green(),c.blue());
gluTessBeginPolygon(tess_,f->normal());
// CGAL_NEF_TRACEN(" ");
// CGAL_NEF_TRACEN("Begin Polygon");
gluTessNormal(tess_,f->dx(),f->dy(),f->dz());
// forall facet cycles of f:
for(unsigned i = 0; i < f->number_of_facet_cycles(); ++i) {
gluTessBeginContour(tess_);
// CGAL_NEF_TRACEN(" Begin Contour");
// put all vertices in facet cycle into contour:
for(cit = f->facet_cycle_begin(i);
cit != f->facet_cycle_end(i); ++cit) {
gluTessVertex(tess_, *cit, *cit);
// CGAL_NEF_TRACEN(" add Vertex");
}
gluTessEndContour(tess_);
// CGAL_NEF_TRACEN(" End Contour");
}
gluTessEndPolygon(tess_);
// CGAL_NEF_TRACEN("End Polygon");
gluDeleteTess(tess_);
}
void construct_axes() const
{
glLineWidth(2.0);
// red x-axis
glColor3f(1.0,0.0,0.0);
glBegin(GL_LINES);
glVertex3f(0.0,0.0,0.0);
glVertex3f(5000.0,0.0,0.0);
glEnd();
// green y-axis
glColor3f(0.0,1.0,0.0);
glBegin(GL_LINES);
glVertex3f(0.0,0.0,0.0);
glVertex3f(0.0,5000.0,0.0);
glEnd();
// blue z-axis and equator
glColor3f(0.0,0.0,1.0);
glBegin(GL_LINES);
glVertex3f(0.0,0.0,0.0);
glVertex3f(0.0,0.0,5000.0);
glEnd();
// six coordinate points in pink:
glPointSize(10);
glBegin(GL_POINTS);
glColor3f(1.0,0.0,0.0);
glVertex3d(5,0,0);
glColor3f(0.0,1.0,0.0);
glVertex3d(0,5,0);
glColor3f(0.0,0.0,1.0);
glVertex3d(0,0,5);
glEnd();
}
void fill_display_lists() {
glNewList(object_list_, GL_COMPILE);
Vertex_iterator v;
for(v=vertices_.begin();v!=vertices_.end();++v)
draw(v);
glEndList();
glNewList(object_list_+1, GL_COMPILE);
Edge_iterator e;
for(e=edges_.begin();e!=edges_.end();++e)
draw(e);
glEndList();
glNewList(object_list_+2, GL_COMPILE);
Halffacet_iterator f;
for(f=halffacets_.begin();f!=halffacets_.end();++f)
draw(f);
glEndList();
glNewList(object_list_+3, GL_COMPILE); // axes:
construct_axes();
glEndList();
}
void init() {
if (init_) return;
init_ = true;
switches[SNC_AXES] = false;
style = SNC_BOUNDARY;
object_list_ = glGenLists(4);
CGAL_assertion(object_list_);
fill_display_lists();
}
void draw() const
{
if (!is_initialized()) const_cast<Polyhedron&>(*this).init();
double l = (std::max)( (std::max)( bbox().xmax() - bbox().xmin(),
bbox().ymax() - bbox().ymin()),
bbox().zmax() - bbox().zmin());
if ( l < 1) // make sure that a single point doesn't screw up here
l = 1;
glScaled( 4.0/l, 4.0/l, 4.0/l);
glTranslated( -(bbox().xmax() + bbox().xmin()) / 2.0,
-(bbox().ymax() + bbox().ymin()) / 2.0,
-(bbox().zmax() + bbox().zmin()) / 2.0);
if (style == SNC_BOUNDARY) {
//glEnable(GL_LIGHTING);
glCallList(object_list_+2); // facets
//glDisable(GL_LIGHTING);
}
// move edges and vertices a bit towards the view-point,
// i.e., 1/100th of the unit vector in camera space
// double f = l / 4.0 / 100.0;
// glTranslated( z_vec[0] * f, z_vec[1] * f, z_vec[2] * f);
glCallList(object_list_+1); // edges
glCallList(object_list_); // vertices
if (switches[SNC_AXES]) glCallList(object_list_+3); // axis
}
void debug(std::ostream& os = std::cerr) const
{
os << "OGL::Polyhedron" << std::endl;
os << "Vertices:" << std::endl;
Vertex_iterator v;
for(v=vertices_.begin();v!=vertices_.end();++v)
os << " "<<*v<<", mark="<<v->mark()<<std::endl;
os << "Edges:" << std::endl;
Edge_iterator e;
for(e=edges_.begin();e!=edges_.end();++e)
os << " "<<*e<<", mark="<<e->mark()<<std::endl;
os << "Facets:" << std::endl;
Halffacet_iterator f;
for(f=halffacets_.begin();f!=halffacets_.end();++f)
f->debug(); os << std::endl;
os << std::endl;
}
}; // Polyhedron
template<typename Nef_polyhedron>
class Nef3_Converter {
typedef typename Nef_polyhedron::SNC_structure SNC_structure;
typedef CGAL::SNC_decorator<SNC_structure> Base;
typedef CGAL::SNC_FM_decorator<SNC_structure> FM_decorator;
public:
typedef typename SNC_structure::Vertex_const_iterator Vertex_const_iterator;
typedef typename SNC_structure::Halfedge_const_iterator Halfedge_const_iterator;
typedef typename SNC_structure::Halffacet_const_iterator Halffacet_const_iterator;
typedef typename SNC_structure::Halffacet_cycle_const_iterator Halffacet_cycle_const_iterator;
typedef typename SNC_structure::Object_const_handle Object_const_handle;
typedef typename SNC_structure::SHalfedge_const_handle SHalfedge_const_handle;
typedef typename SNC_structure::SHalfloop_const_handle SHalfloop_const_handle;
typedef typename SNC_structure::Vertex_const_handle Vertex_const_handle;
typedef typename SNC_structure::Halfedge_const_handle Halfedge_const_handle;
typedef typename SNC_structure::Halffacet_const_handle Halffacet_const_handle;
typedef typename SNC_structure::Point_3 Point_3;
typedef typename SNC_structure::Vector_3 Vector_3;
typedef typename SNC_structure::Segment_3 Segment_3;
typedef typename SNC_structure::Plane_3 Plane_3;
typedef typename SNC_structure::Mark Mark;
typedef typename SNC_structure::SHalfedge_around_facet_const_circulator
SHalfedge_around_facet_const_circulator;
private:
static OGL::Double_point double_point(const Point_3& p)
{ return OGL::Double_point(CGAL::to_double(p.x()),
CGAL::to_double(p.y()),
CGAL::to_double(p.z())); }
static OGL::Double_segment double_segment(const Segment_3& s)
{ return OGL::Double_segment(double_point(s.source()),
double_point(s.target())); }
static void draw(Vertex_const_handle v, const Nef_polyhedron& ,
CGAL::OGL::Polyhedron& P) {
Point_3 bp = v->point();
// CGAL_NEF_TRACEN("vertex " << bp);
P.push_back(double_point(bp), v->mark());
}
static void draw(Halfedge_const_handle e, const Nef_polyhedron& ,
CGAL::OGL::Polyhedron& P) {
Vertex_const_handle s = e->source();
Vertex_const_handle t = e->twin()->source();
Segment_3 seg(s->point(),t->point());
// CGAL_NEF_TRACEN("edge " << seg);
P.push_back(double_segment(seg), e->mark());
}
static void draw(Halffacet_const_handle f, const Nef_polyhedron& ,
CGAL::OGL::Polyhedron& P) {
OGL::DFacet g;
Halffacet_cycle_const_iterator fc; // all facet cycles:
CGAL_forall_facet_cycles_of(fc,f)
if ( fc.is_shalfedge() ) { // non-trivial facet cycle
g.new_facet_cycle();
SHalfedge_const_handle h = fc;
SHalfedge_around_facet_const_circulator hc(h), he(hc);
CGAL_For_all(hc,he){ // all vertex coordinates in facet cycle
Point_3 sp = hc->source()->source()->point();
// CGAL_NEF_TRACEN(" ");CGAL_NEF_TRACEN("facet" << sp);
g.push_back_vertex(double_point(sp));
}
}
Vector_3 v = f->plane().orthogonal_vector();
g.set_normal(CGAL::to_double(v.x()),
CGAL::to_double(v.y()),
CGAL::to_double(v.z()),
f->mark());
P.push_back(g);
}
// Returns the bounding box of the finite vertices of the polyhedron.
// Returns $[-1,+1]^3$ as bounding box if no finite vertex exists.
static Bbox_3 bounded_bbox(const Nef_polyhedron& N) {
bool first_vertex = true;
Bbox_3 bbox( -1.0, -1.0, -1.0, 1.0, 1.0, 1.0);
Vertex_const_iterator vi;
CGAL_forall_vertices(vi, N) {
Point_3 p = vi->point();
double x = CGAL::to_double(p.hx());
double y = CGAL::to_double(p.hy());
double z = CGAL::to_double(p.hz());
double w = CGAL::to_double(p.hw());
if (N.is_standard(vi)) {
if(first_vertex) {
bbox = Bbox_3(x/w, y/w, z/w, x/w, y/w, z/w);
first_vertex = false;
} else {
bbox = bbox + Bbox_3(x/w, y/w, z/w, x/w, y/w, z/w);
first_vertex = false;
}
}
}
return bbox;
}
static void set_R(Bbox_3& bbox, const Nef_polyhedron& N) {
if(N.is_standard_kernel()) return;
double size = abs(bbox.xmin());
if(size < bbox.xmax()) size = bbox.xmax();
if(size < bbox.ymin()) size = bbox.ymin();
if(size < bbox.ymax()) size = bbox.ymax();
if(size < bbox.zmin()) size = bbox.zmin();
if(size < bbox.zmax()) size = bbox.zmax();
N.set_size_of_infimaximal_box(size*50);
// CGAL_NEF_TRACEN("set infi box size to " << size);
Vertex_const_iterator vi;
CGAL_forall_vertices(vi, N)
if(N.is_standard(vi))
return;
bbox = Bbox_3(bbox.xmin()*10,bbox.ymin()*10,bbox.zmin()*10,
bbox.xmax()*10,bbox.ymax()*10,bbox.zmax()*10);
}
public:
static void convert_to_OGLPolyhedron(const Nef_polyhedron& N, CGAL::OGL::Polyhedron* P) {
Bbox_3 bbox(bounded_bbox(N));
set_R(bbox,N);
P->bbox() = bbox;
Vertex_const_iterator v;
CGAL_forall_vertices(v,*N.sncp()) draw(v,N,*P);
Halfedge_const_iterator e;
CGAL_forall_edges(e,*N.sncp()) draw(e,N,*P);
Halffacet_const_iterator f;
CGAL_forall_facets(f,*N.sncp()) draw(f,N,*P);
}
}; // Nef3_Converter
} // namespace OGL
} //namespace CGAL
#endif // CGAL_NEF_OPENGL_HELPER_H
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