void Viewer::triangulate_facet()
{
pos_facets.resize(0);
flat_normals.resize(0);
smooth_normals.resize(0);
colors.resize(0);
LCC &lcc = *scene->lcc;
for (LCC::Attribute_range<3>::type::iterator
it=lcc.attributes<3>().begin(),
itend=lcc.attributes<3>().end(); it!=itend; ++it )
{
if ( it->info().is_visible() )
{
for(LCC::One_dart_per_incident_cell_range<2,3>::iterator
dartIter=lcc.one_dart_per_incident_cell<2,3>
(lcc.dart_of_attribute<3>(it)).begin(); dartIter.cont(); ++dartIter)
{
//Computes the normal of the facet
Traits::Vector_3 normal = CGAL::compute_normal_of_cell_2(lcc,dartIter);
normal = normal/(CGAL::sqrt(normal*normal));
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
LCC::Dart_of_orbit_range<1>::const_iterator
he_circ = lcc.darts_of_orbit<1>(dartIter).begin(),
he_circ_end = lcc.darts_of_orbit<1>(dartIter).end();
// Iterates on the vector of facet handles
CDT::Vertex_handle previous, first;
do {
CDT::Vertex_handle vh = cdt.insert(lcc.point(he_circ));
if(first == 0) {
first = vh;
}
//vh->info() = he_circ;
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++he_circ != he_circ_end );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
fit = cdt.all_faces_begin(),
end = cdt.all_faces_end();
fit != end; ++fit)
{
fit->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external)
continue;
//compute normals (no smooth for non-triangle facets objects
LCC::Vector normal = CGAL::compute_normal_of_cell_2(lcc,dartIter);
normal = normal/(CGAL::sqrt(normal*normal));
smooth_normals.push_back(normal.x());smooth_normals.push_back(normal.y());smooth_normals.push_back(normal.z());
smooth_normals.push_back(normal.x());smooth_normals.push_back(normal.y());smooth_normals.push_back(normal.z());
smooth_normals.push_back(normal.x());smooth_normals.push_back(normal.y());smooth_normals.push_back(normal.z());
flat_normals.push_back(normal.x());flat_normals.push_back(normal.y());flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());flat_normals.push_back(normal.y());flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());flat_normals.push_back(normal.y());flat_normals.push_back(normal.z());
pos_facets.push_back(ffit->vertex(0)->point().x()); pos_facets.push_back(ffit->vertex(0)->point().y()); pos_facets.push_back(ffit->vertex(0)->point().z());
pos_facets.push_back(ffit->vertex(1)->point().x()); pos_facets.push_back(ffit->vertex(1)->point().y()); pos_facets.push_back(ffit->vertex(1)->point().z());
pos_facets.push_back(ffit->vertex(2)->point().x()); pos_facets.push_back(ffit->vertex(2)->point().y()); pos_facets.push_back(ffit->vertex(2)->point().z());
double r = (double)lcc.info<3>(dartIter).color().r()/255.0;
double g = (double)lcc.info<3>(dartIter).color().g()/255.0;
double b = (double)lcc.info<3>(dartIter).color().b()/255.0;
if ( !lcc.is_free(dartIter, 3) )
{
r += (double)lcc.info<3>(lcc.beta(dartIter,3)).color().r()/255.0;
g += (double)lcc.info<3>(lcc.beta(dartIter,3)).color().g()/255.0;
b += (double)lcc.info<3>(lcc.beta(dartIter,3)).color().b()/255.0;
r /= 2; g /= 2; b /= 2;
}
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
}
}
}
}
}
void FixedPlaneMesh::TrianglatePolygon(const double3& normal, std::vector<Point3D>& pts, ListOfvertices& results)
{
if (pts.size() < 3)
return ;
if (pts.size() ==3)
{
VertexInfo vi1(pts[0], normal, mColor);
VertexInfo vi2(pts[1], normal, mColor);
VertexInfo vi3(pts[2], normal, mColor);
results.push_back(vi1);
results.push_back(vi2);
results.push_back(vi3);
return ;
}
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Triangulation_vertex_base_2<K> Vb;
typedef CGAL::Constrained_triangulation_face_base_2<K> Fb;
typedef CGAL::Triangulation_data_structure_2<Vb,Fb> TDS;
//typedef CGAL::Exact_predicates_tag Itag;
typedef CGAL::Constrained_Delaunay_triangulation_2<K, TDS, CGAL::No_intersection_tag> CDT;
vec3<double> origin = pts[0];
vec3<double> N = normal;
vec3<double> U = normalize(pts[1] - origin);
vec3<double> V = cross(N, U);
CDT cdt;
CDT::Vertex_handle vh1, vh2, vh3;
vec3<double> v0 = PosToLocal(U, V, N, origin, pts[0]);
CDT::Point p0(v0.x, v0.y);
vh1 = vh3 = cdt.insert(p0);
for ( int i = 1; i< pts.size() ; i++)
{
vec3<double> v1 = PosToLocal(U, V, N, origin, pts[i]);
CDT::Point p1(v1.x, v1.y);
vh2 = cdt.insert(p1);
cdt.insert_constraint(vh1, vh2);
vh1 = vh2;
}
cdt.insert_constraint(vh2, vh3);
int count = cdt.number_of_faces() ;
results.reserve(count*3);
for (CDT::Finite_faces_iterator fit = cdt.finite_faces_begin();
fit != cdt.finite_faces_end(); ++fit)
{
vec2<double> v0(fit->vertex(2)->point().x(),fit->vertex(2)->point().y() );
vec2<double> v1(fit->vertex(1)->point().x(),fit->vertex(1)->point().y() );
vec2<double> v2(fit->vertex(0)->point().x(),fit->vertex(0)->point().y() );
if (IsEqual(cross(v0- v2, v1-v2), (double)0., (double)EPSF ))
continue; //
vec3<double > p0(v0, 0.0);
vec3<double > p1(v1, 0.0);
vec3<double > p2(v2, 0.0);
p0 = PosToGlobal(U, V, N, origin, p0);
p1 = PosToGlobal(U, V, N, origin, p1);
p2 = PosToGlobal(U, V, N, origin, p2);
VertexInfo vi1(p0, N, mColor);
VertexInfo vi2(p1, N, mColor);
VertexInfo vi3(p2, N, mColor);
results.push_back(vi1);
results.push_back(vi2);
results.push_back(vi3);
}
}
void Scene_nef_polyhedron_item::compute_normals_and_vertices(void)
{
int count = 0;
positions_facets.resize(0);
positions_points.resize(0);
color_lines.resize(0);
color_facets.resize(0);
color_points.resize(0);
normals.resize(0);
positions_lines.resize(0);
//The Facets
{
for(Nef_polyhedron::Halffacet_const_iterator
f = nef_poly->halffacets_begin (),
end = nef_poly->halffacets_end();
f != end; ++f)
{
if(f->is_twin()) continue;
count++;
Nef_polyhedron::Vector_3 v = f->plane().orthogonal_vector();
P_traits cdt_traits(v);
CDT cdt(cdt_traits);
for(Nef_polyhedron::Halffacet_cycle_const_iterator
fc = f->facet_cycles_begin(),
end = f->facet_cycles_end();
fc != end; ++fc)
{
if ( fc.is_shalfedge() )
{
Nef_polyhedron::SHalfedge_const_handle h = fc;
Nef_polyhedron::SHalfedge_around_facet_const_circulator hc(h), he(hc);
CDT::Vertex_handle previous, first;
do {
Nef_polyhedron::SVertex_const_handle v = hc->source();
const Nef_polyhedron::Point_3& point = v->source()->point();
CDT::Vertex_handle vh = cdt.insert(point);
if(first == 0) {
first = vh;
}
vh->info() = hc->source();
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++hc != he );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
fit = cdt.all_faces_begin(),
end = cdt.all_faces_end();
fit != end; ++fit)
{
fit->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external){ continue;}
for(int i = 0; i<3; i++)
{
positions_facets.push_back(CGAL::to_double(ffit->vertex(i)->point().x()));
positions_facets.push_back(CGAL::to_double(ffit->vertex(i)->point().y()));
positions_facets.push_back(CGAL::to_double(ffit->vertex(i)->point().z()));
}
Nef_polyhedron::Vector_3 v = f->plane().orthogonal_vector();
GLdouble normal[3];
normal[0] = CGAL::to_double(v.x());
normal[1] = CGAL::to_double(v.y());
normal[2] = CGAL::to_double(v.z());
GLdouble norm = normal[0]*normal[0]
+ normal[1]*normal[1]
+ normal[2]*normal[2];
norm = CGAL::sqrt(norm);
normal[0] /= norm;
normal[1] /= norm;
normal[2] /= norm;
normals.push_back(normal[0]);
normals.push_back(normal[1]);
normals.push_back(normal[2]);
normals.push_back(normal[0]);
normals.push_back(normal[1]);
normals.push_back(normal[2]);
normals.push_back(normal[0]);
normals.push_back(normal[1]);
normals.push_back(normal[2]);
if(is_selected)
{
color_facets.push_back(this->color().lighter(120).redF());
color_facets.push_back(this->color().lighter(120).greenF());
color_facets.push_back(this->color().lighter(120).blueF());
color_facets.push_back(this->color().lighter(120).redF());
color_facets.push_back(this->color().lighter(120).greenF());
color_facets.push_back(this->color().lighter(120).blueF());
color_facets.push_back(this->color().lighter(120).redF());
color_facets.push_back(this->color().lighter(120).greenF());
color_facets.push_back(this->color().lighter(120).blueF());
}
else
{
color_facets.push_back(this->color().redF());
color_facets.push_back(this->color().greenF());
color_facets.push_back(this->color().blueF());
color_facets.push_back(this->color().redF());
color_facets.push_back(this->color().greenF());
color_facets.push_back(this->color().blueF());
color_facets.push_back(this->color().redF());
color_facets.push_back(this->color().greenF());
color_facets.push_back(this->color().blueF());
}
}
}
}
}
} // end facets
//The Lines
{
for(Nef_polyhedron::Halfedge_const_iterator
e = nef_poly->halfedges_begin(),
end = nef_poly->halfedges_end();
e != end; ++e)
{
if (e->is_twin()) continue;
const Nef_polyhedron::Vertex_const_handle& s = e->source();
const Nef_polyhedron::Vertex_const_handle& t = e->twin()->source();
const Nef_polyhedron::Point_3& a = s->point();
const Nef_polyhedron::Point_3& b = t->point();
positions_lines.push_back(CGAL::to_double(a.x()));
positions_lines.push_back(CGAL::to_double(a.y()));
positions_lines.push_back(CGAL::to_double(a.z()));
positions_lines.push_back(CGAL::to_double(b.x()));
positions_lines.push_back(CGAL::to_double(b.y()));
positions_lines.push_back(CGAL::to_double(b.z()));
if(is_selected)
{
color_lines.push_back(this->color().lighter(50).redF());
color_lines.push_back(this->color().lighter(50).greenF());
color_lines.push_back(this->color().lighter(50).blueF());
color_lines.push_back(this->color().lighter(50).redF());
color_lines.push_back(this->color().lighter(50).greenF());
color_lines.push_back(this->color().lighter(50).blueF());
}
else
{
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
color_lines.push_back(0.0);
}
}
}
//The points
{
for(Nef_polyhedron::Vertex_const_iterator
v = nef_poly->vertices_begin(),
end = nef_poly->vertices_end();
v != end; ++v)
{
const Nef_polyhedron::Point_3& p = v->point();
positions_points.push_back(CGAL::to_double(p.x()));
positions_points.push_back(CGAL::to_double(p.y()));
positions_points.push_back(CGAL::to_double(p.z()));
color_points.push_back(this->color().lighter(50).redF());
color_points.push_back(this->color().lighter(50).greenF());
color_points.push_back(this->color().lighter(50).blueF());
color_points.push_back(this->color().lighter(50).redF());
color_points.push_back(this->color().lighter(50).greenF());
color_points.push_back(this->color().lighter(50).blueF());
}
} //end points
}
void
Scene_polyhedron_item::triangulate_facet(Facet_iterator fit) const
{
//Computes the normal of the facet
Traits::Vector_3 normal =
CGAL::Polygon_mesh_processing::compute_face_normal(fit,*poly);
//check if normal contains NaN values
if (normal.x() != normal.x() || normal.y() != normal.y() || normal.z() != normal.z())
{
qDebug()<<"Warning : normal is not valid. Facet not displayed";
return;
}
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
Facet::Halfedge_around_facet_circulator
he_circ = fit->facet_begin(),
he_circ_end(he_circ);
// Iterates on the vector of facet handles
CDT::Vertex_handle previous, first;
do {
CDT::Vertex_handle vh = cdt.insert(he_circ->vertex()->point());
if(first == 0) {
first = vh;
}
vh->info() = he_circ;
if(previous != 0 && previous != vh) {
cdt.insert_constraint(previous, vh);
}
previous = vh;
} while( ++he_circ != he_circ_end );
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator
fit2 = cdt.all_faces_begin(),
end = cdt.all_faces_end();
fit2 != end; ++fit2)
{
fit2->info().is_external = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() ) {
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(fh->info().is_external) continue;
fh->info().is_external = true;
for(int i = 0; i <3; ++i) {
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator
ffit = cdt.finite_faces_begin(),
end = cdt.finite_faces_end();
ffit != end; ++ffit)
{
if(ffit->info().is_external)
continue;
double vertices[3][3];
vertices[0][0] = ffit->vertex(0)->point().x();
vertices[0][1] = ffit->vertex(0)->point().y();
vertices[0][2] = ffit->vertex(0)->point().z();
vertices[1][0] = ffit->vertex(1)->point().x();
vertices[1][1] = ffit->vertex(1)->point().y();
vertices[1][2] = ffit->vertex(1)->point().z();
vertices[2][0] = ffit->vertex(2)->point().x();
vertices[2][1] = ffit->vertex(2)->point().y();
vertices[2][2] = ffit->vertex(2)->point().z();
positions_facets.push_back( vertices[0][0]);
positions_facets.push_back( vertices[0][1]);
positions_facets.push_back( vertices[0][2]);
positions_facets.push_back(1.0);
positions_facets.push_back( vertices[1][0]);
positions_facets.push_back( vertices[1][1]);
positions_facets.push_back( vertices[1][2]);
positions_facets.push_back(1.0);
positions_facets.push_back( vertices[2][0]);
positions_facets.push_back( vertices[2][1]);
positions_facets.push_back( vertices[2][2]);
positions_facets.push_back(1.0);
typedef Kernel::Vector_3 Vector;
Vector n = CGAL::Polygon_mesh_processing::compute_face_normal(fit, *poly);
normals_flat.push_back(n.x());
normals_flat.push_back(n.y());
normals_flat.push_back(n.z());
normals_flat.push_back(n.x());
normals_flat.push_back(n.y());
normals_flat.push_back(n.z());
normals_flat.push_back(n.x());
normals_flat.push_back(n.y());
normals_flat.push_back(n.z());
normals_gouraud.push_back(n.x());
normals_gouraud.push_back(n.y());
normals_gouraud.push_back(n.z());
normals_gouraud.push_back(n.x());
normals_gouraud.push_back(n.y());
normals_gouraud.push_back(n.z());
normals_gouraud.push_back(n.x());
normals_gouraud.push_back(n.y());
normals_gouraud.push_back(n.z());
}
}
void triangulate(const Polygon_2& polygon,
Cut_iter cuts_begin, Cut_iter cuts_end,
const boost::unordered_map<Point_3, boost::unordered_set<Segment_3_undirected> >& point2edges,
Out_iter triangles)
{
typedef CGAL::Triangulation_vertex_base_2<Kernel> Vb;
typedef CGAL::Triangulation_vertex_base_with_info_2<Point_3, Kernel, Vb> Info;
typedef CGAL::Constrained_triangulation_face_base_2<Kernel> Fb;
typedef CGAL::Triangulation_data_structure_2<Info,Fb> TDS;
typedef CGAL::Exact_predicates_tag Itag;
typedef CGAL::Constrained_Delaunay_triangulation_2<Kernel, TDS, Itag> CDT;
typedef CDT::Vertex_handle Vertex_handle;
static log4cplus::Logger logger = log4cplus::Logger::getInstance("polygon_utils");
Polygon_2 p(polygon);
LOG4CPLUS_TRACE(logger, "Triangulating " << pp(p));
if (p.size() < 3) return;
bool vertical = is_vertical(p);
if (vertical)
{
LOG4CPLUS_TRACE(logger, "Polygon is vertical. Rotating.");
p = yz_swap_neg(p);
}
bool reverse = !p.is_counterclockwise_oriented();
if (reverse)
p.reverse_orientation();
CDT cdt;
boost::unordered_map<Point_3, Vertex_handle> point2handle;
for (Polygon_2::Vertex_iterator it = p.vertices_begin(); it != p.vertices_end(); ++it)
{
Vertex_handle h = cdt.insert(*it);
point2handle[*it] = h;
h->info() = *it;//it->z();
}
Polygon_2::Vertex_circulator start = p.vertices_circulator();
Polygon_2::Vertex_circulator c = start;
Polygon_2::Vertex_circulator n = c;
++n;
do
{
Vertex_handle ch = point2handle[*c];//cdt.insert(*c);
Vertex_handle nh = point2handle[*n];//cdt.insert(*n);
// ch->info() = c->z();
// nh->info() = n->z();
// cdt.insert_constraint(*c, *n);
cdt.insert_constraint(ch, nh);
++c;
++n;
} while (c != start);
for (Cut_iter c_it = cuts_begin; c_it != cuts_end; ++c_it)
{
Polyline_2 cut = *c_it;
LOG4CPLUS_TRACE(logger, "Adding cut: " << pp(cut));
if (vertical)
cut = yz_swap_neg(cut);
for (Polyline_2::const_iterator c = cut.begin(); c != cut.end(); ++c)
{
Polyline_2::const_iterator n = c;
++n;
if (n != cut.end())
{
const Point_3& cp = *c;
const Point_3& np = *n;
if (point2handle.find(cp) == point2handle.end())
{
Vertex_handle h = cdt.insert(cp);
point2handle[cp] = h;
h->info() = cp;//cp.z();
}
if (point2handle.find(np) == point2handle.end())
{
Vertex_handle h = cdt.insert(np);
point2handle[np] = h;
h->info() = np;//np.z();
}
Vertex_handle ch = point2handle[*c];//cdt.insert(*c);
Vertex_handle nh = point2handle[*n];//cdt.insert(*n);
// ch->info() = c->z();
// nh->info() = n->z();
// cdt.insert_constraint(*c, *n);
cdt.insert_constraint(ch, nh);
LOG4CPLUS_TRACE(logger, " " << pp(Segment_2(*c, *n)));
}
}
}
// Loop through the triangulation and store the vertices of each triangle
for (CDT::Finite_faces_iterator ffi = cdt.finite_faces_begin();
ffi != cdt.finite_faces_end();
++ffi)
{
Triangle t;
Point_3 center = centroid(ffi->vertex(0)->info(), ffi->vertex(1)->info(), ffi->vertex(2)->info());
if (p.has_on_bounded_side(center) &&
is_legal(ffi->vertex(0)->info(), ffi->vertex(1)->info(), ffi->vertex(2)->info(), point2edges))
{
for (int i = 0; i < 3; ++i)
{
int idx = reverse ? 2-i : i;
if (!vertical)
{
// Point_3 p(ffi->vertex(i)->point());
// p = Point_3(p.x(), p.y(), ffi->vertex(i)->info());
Point_3 p(ffi->vertex(i)->info());
t[idx] = p;
}
else
{
// Point_3 p(ffi->vertex(i)->point());
// p = Point_3(p.x(), p.y(), ffi->vertex(i)->info());
Point_3 p(ffi->vertex(i)->info());
t[idx] = yz_swap_pos(p);
}
}
LOG4CPLUS_TRACE(logger, "Adding tile: " << pp_tri(t));
*triangles++ = t;
}
}
}
void triangulate(const Polygon& polygon, Triangle_iter triangles,
const boost::unordered_map<Point_3, boost::unordered_set<Segment_3_undirected> >& point2edges)
{
typedef CGAL::Triangulation_vertex_base_2<Kernel> Vb;
typedef CGAL::Triangulation_vertex_base_with_info_2<bool, Kernel, Vb> Info;
typedef CGAL::Constrained_triangulation_face_base_2<Kernel> Fb;
typedef CGAL::Triangulation_data_structure_2<Info,Fb> TDS;
typedef CGAL::Exact_predicates_tag Itag;
typedef CGAL::Constrained_Delaunay_triangulation_2<Kernel, TDS, Itag> CDT;
static log4cplus::Logger tlogger = log4cplus::Logger::getInstance("polygon_utils");
LOG4CPLUS_TRACE(tlogger, "Triangulating " << pp(polygon));
if (polygon.size() < 3) return;
Polygon p = polygon;
bool vertical = is_vertical(p);
if (vertical)
{
LOG4CPLUS_TRACE(tlogger, "Polygon is vertical. Rotating.");
p = yz_swap_neg(p);
}
bool reverse = !p.is_counterclockwise_oriented();
// THIS IS BAD, BAD, BAD!
{
typename Polygon::Vertex_circulator start = p.vertices_circulator();
typename Polygon::Vertex_circulator c = start;
typename Polygon::Vertex_circulator n = c;
typename Polygon::Vertex_circulator prev = c;
++n;
--prev;
Polygon_2 newp;
do
{
if (!CGAL::collinear(*prev, *c, *n))
newp.push_back(*c);
++prev;
++c;
++n;
} while (c != start);
p = newp;
}
CDT cdt;
typename Polygon::Vertex_circulator start = p.vertices_circulator();
typename Polygon::Vertex_circulator c = start;
typename Polygon::Vertex_circulator n = c;
do
{
cdt.insert_constraint(*c, *n);
++c;
++n;
} while (c != start);
// Loop through the triangulation and store the vertices of each triangle
for (CDT::Finite_faces_iterator ffi = cdt.finite_faces_begin();
ffi != cdt.finite_faces_end();
++ffi)
{
Triangle t;
Point_3 center = centroid(ffi->vertex(0)->point(), ffi->vertex(1)->point(), ffi->vertex(2)->point());
if (p.has_on_bounded_side(center) &&
is_legal(ffi->vertex(0)->point(), ffi->vertex(1)->point(), ffi->vertex(2)->point(), point2edges))
{
for (int i = 0; i < 3; ++i)
{
int idx = reverse ? 2-i : i;
if (!vertical)
t[idx] = ffi->vertex(i)->point();
else
t[idx] = yz_swap_pos(ffi->vertex(i)->point());
}
LOG4CPLUS_TRACE(tlogger, "Adding tile: " << pp_tri(t));
*triangles = t;
++triangles;
}
}
}
void Viewer::compute_face(Dart_handle dh, LCC::size_type markface)
{
LCC &lcc = *scene->lcc;
CGAL::mark_cell<LCC, 2>(lcc, dh, markface);
double r = (double)lcc.info<3>(dh).color().r()/255.0;
double g = (double)lcc.info<3>(dh).color().g()/255.0;
double b = (double)lcc.info<3>(dh).color().b()/255.0;
if ( !lcc.is_free(dh, 3) )
{
r += (double)lcc.info<3>(lcc.beta(dh,3)).color().r()/255.0;
g += (double)lcc.info<3>(lcc.beta(dh,3)).color().g()/255.0;
b += (double)lcc.info<3>(lcc.beta(dh,3)).color().b()/255.0;
r /= 2; g /= 2; b /= 2;
}
//compute flat normals
LCC::Vector normal = CGAL::compute_normal_of_cell_2(lcc,dh);
normal = normal/(CGAL::sqrt(normal*normal));
if (lcc.beta<1,1,1>(dh)!=dh)
{
P_traits cdt_traits(normal);
CDT cdt(cdt_traits);
// Iterates on the vector of facet handles
CDT::Vertex_handle previous = NULL, first = NULL;
for (LCC::Dart_of_orbit_range<1>::const_iterator
he_circ = lcc.darts_of_orbit<1>(dh).begin(),
he_circ_end = lcc.darts_of_orbit<1>(dh).end();
he_circ!=he_circ_end; ++he_circ)
{
CDT::Vertex_handle vh = cdt.insert(lcc.point(he_circ));
if(first == NULL)
{ first = vh; }
vh->info().v = CGAL::compute_normal_of_cell_0<LCC>(lcc, he_circ);
if(previous!=NULL && previous != vh)
{ cdt.insert_constraint(previous, vh); }
previous = vh;
}
if (previous!=NULL)
cdt.insert_constraint(previous, first);
// sets mark is_external
for(CDT::All_faces_iterator fit = cdt.all_faces_begin(),
fitend = cdt.all_faces_end(); fit!=fitend; ++fit)
{
fit->info().is_external = true;
fit->info().is_process = false;
}
//check if the facet is external or internal
std::queue<CDT::Face_handle> face_queue;
CDT::Face_handle face_internal = NULL;
face_queue.push(cdt.infinite_vertex()->face());
while(! face_queue.empty() )
{
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(!fh->info().is_process)
{
fh->info().is_process = true;
for(int i = 0; i <3; ++i)
{
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
else if (face_internal==NULL)
{
face_internal = fh->neighbor(i);
}
}
}
}
if ( face_internal!=NULL )
face_queue.push(face_internal);
while(! face_queue.empty() )
{
CDT::Face_handle fh = face_queue.front();
face_queue.pop();
if(!fh->info().is_process)
{
fh->info().is_process = true;
fh->info().is_external = false;
for(int i = 0; i <3; ++i)
{
if(!cdt.is_constrained(std::make_pair(fh, i)))
{
face_queue.push(fh->neighbor(i));
}
}
}
}
//iterates on the internal faces to add the vertices to the positions
//and the normals to the appropriate vectors
for(CDT::Finite_faces_iterator ffit = cdt.finite_faces_begin(),
ffitend = cdt.finite_faces_end(); ffit != ffitend; ++ffit)
{
if(!ffit->info().is_external)
{
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
smooth_normals.push_back(ffit->vertex(0)->info().v.x());
smooth_normals.push_back(ffit->vertex(0)->info().v.y());
smooth_normals.push_back(ffit->vertex(0)->info().v.z());
smooth_normals.push_back(ffit->vertex(1)->info().v.x());
smooth_normals.push_back(ffit->vertex(1)->info().v.y());
smooth_normals.push_back(ffit->vertex(1)->info().v.z());
smooth_normals.push_back(ffit->vertex(2)->info().v.x());
smooth_normals.push_back(ffit->vertex(2)->info().v.y());
smooth_normals.push_back(ffit->vertex(2)->info().v.z());
pos_facets.push_back(ffit->vertex(0)->point().x());
pos_facets.push_back(ffit->vertex(0)->point().y());
pos_facets.push_back(ffit->vertex(0)->point().z());
pos_facets.push_back(ffit->vertex(1)->point().x());
pos_facets.push_back(ffit->vertex(1)->point().y());
pos_facets.push_back(ffit->vertex(1)->point().z());
pos_facets.push_back(ffit->vertex(2)->point().x());
pos_facets.push_back(ffit->vertex(2)->point().y());
pos_facets.push_back(ffit->vertex(2)->point().z());
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
}
}
}
else
{
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
colors.push_back(r);colors.push_back(g);colors.push_back(b);
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
flat_normals.push_back(normal.x());
flat_normals.push_back(normal.y());
flat_normals.push_back(normal.z());
for (LCC::Dart_of_orbit_range<1>::const_iterator
orbitIter = lcc.darts_of_orbit<1>(dh).begin();
orbitIter.cont(); ++orbitIter)
{
//compute Smooth normals
LCC::Vector normal = CGAL::compute_normal_of_cell_0(lcc,orbitIter);
normal = normal/(CGAL::sqrt(normal*normal));
smooth_normals.push_back(normal.x());
smooth_normals.push_back(normal.y());
smooth_normals.push_back(normal.z());
const LCC::Point& p = lcc.point(orbitIter);
pos_facets.push_back(p.x());
pos_facets.push_back(p.y());
pos_facets.push_back(p.z());
}
}
}
int main() {
//construct two non-intersecting nested polygons
Polygon_2 polygon1;
polygon1.push_back(Point_2(0.0, 0.0));
polygon1.push_back(Point_2(2.0, 0.0));
polygon1.push_back(Point_2(1.7, 1.0));
polygon1.push_back(Point_2(2.0, 2.0));
polygon1.push_back(Point_2(0.0, 2.0));
Polygon_2 polygon2;
polygon2.push_back(Point_2(0.5, 0.5));
polygon2.push_back(Point_2(1.5, 0.5));
polygon2.push_back(Point_2(1.5, 1.5));
polygon2.push_back(Point_2(0.5, 1.5));
//Insert the polyons into a constrained triangulation
CDT cdt;
insert_polygon(cdt, polygon1);
insert_polygon(cdt, polygon2);
//Extract point and provide the an index
std::vector< triangulation_point > points ;
for ( CDT::Vertex_iterator it = cdt.vertices_begin(); it != cdt.vertices_end(); ++it ){
it->info() = points.size() ;
points.push_back( it->point() );
}
//Mark facets that are inside the domain bounded by the polygon
mark_domains(cdt);
//
int count = 0;
for (CDT::Finite_faces_iterator fit = cdt.finite_faces_begin(); fit != cdt.finite_faces_end(); ++fit) {
if (fit->info().in_domain()){
++count;
}
}
/*
* export
*/
std::ofstream ofs("polygon_triangulation2.obj");
if ( ! ofs.good() ){
std::cout << "can't open file" << std::endl;
return 1 ;
}
//-- print vertices
ofs << "# " << points.size() << " vertices"<< std::endl ;
for ( size_t i = 0; i < points.size(); i++ ){
ofs << "v " << points[i] << " 0.0" << std::endl;
}
//-- print faces
ofs << "# " << cdt.number_of_faces() << " faces"<< std::endl ;
// warning : Delaunay_triangulation_2::All_faces_iterator iterator over infinite faces
for ( CDT::Finite_faces_iterator it = cdt.finite_faces_begin(); it != cdt.finite_faces_end(); ++it )
{
//ignore holes
if ( ! it->info().in_domain() ){
continue ;
}
size_t ia = it->vertex(0)->info();
size_t ib = it->vertex(1)->info();
size_t ic = it->vertex(2)->info();
assert( it->is_valid() );
//assert ( ia < cdt.number_of_vertices() || ib < tri.number_of_vertices() || ic < tri.number_of_vertices() ) ;
ofs << "f " << ( ia + 1 ) << " " << ( ib + 1 ) << " " << ( ic + 1 ) << std::endl;
}
return 0;
}