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#ifdef ENABLE_CGAL
#include "cgalutils.h"
#include "polyset.h"
#include "printutils.h"
#include "cgal.h"
#include <CGAL/assertions_behaviour.h>
#include <CGAL/exceptions.h>
PolySet *createPolySetFromPolyhedron(const CGAL_Polyhedron &p)
{
PolySet *ps = new PolySet();
typedef CGAL_Polyhedron::Vertex Vertex;
typedef CGAL_Polyhedron::Vertex_const_iterator VCI;
typedef CGAL_Polyhedron::Facet_const_iterator FCI;
typedef CGAL_Polyhedron::Halfedge_around_facet_const_circulator HFCC;
for (FCI fi = p.facets_begin(); fi != p.facets_end(); ++fi) {
HFCC hc = fi->facet_begin();
HFCC hc_end = hc;
Vertex v1, v2, v3;
v1 = *VCI((hc++)->vertex());
v3 = *VCI((hc++)->vertex());
do {
v2 = v3;
v3 = *VCI((hc++)->vertex());
double x1 = CGAL::to_double(v1.point().x());
double y1 = CGAL::to_double(v1.point().y());
double z1 = CGAL::to_double(v1.point().z());
double x2 = CGAL::to_double(v2.point().x());
double y2 = CGAL::to_double(v2.point().y());
double z2 = CGAL::to_double(v2.point().z());
double x3 = CGAL::to_double(v3.point().x());
double y3 = CGAL::to_double(v3.point().y());
double z3 = CGAL::to_double(v3.point().z());
ps->append_poly();
ps->append_vertex(x1, y1, z1);
ps->append_vertex(x2, y2, z2);
ps->append_vertex(x3, y3, z3);
} while (hc != hc_end);
}
return ps;
}
#undef GEN_SURFACE_DEBUG
class CGAL_Build_PolySet : public CGAL::Modifier_base<CGAL_HDS>
{
public:
typedef CGAL_HDS::Vertex::Point CGALPoint;
const PolySet &ps;
CGAL_Build_PolySet(const PolySet &ps) : ps(ps) { }
void operator()(CGAL_HDS& hds)
{
CGAL_Polybuilder B(hds, true);
std::vector<CGALPoint> vertices;
Grid3d<int> vertices_idx(GRID_FINE);
for (size_t i = 0; i < ps.polygons.size(); i++) {
const PolySet::Polygon *poly = &ps.polygons[i];
for (size_t j = 0; j < poly->size(); j++) {
const Vector3d &p = poly->at(j);
if (!vertices_idx.has(p[0], p[1], p[2])) {
vertices_idx.data(p[0], p[1], p[2]) = vertices.size();
vertices.push_back(CGALPoint(p[0], p[1], p[2]));
}
}
}
B.begin_surface(vertices.size(), ps.polygons.size());
#ifdef GEN_SURFACE_DEBUG
printf("=== CGAL Surface ===\n");
#endif
for (size_t i = 0; i < vertices.size(); i++) {
const CGALPoint &p = vertices[i];
B.add_vertex(p);
#ifdef GEN_SURFACE_DEBUG
printf("%d: %f %f %f\n", i, p[0], p[1], p[2]);
#endif
}
for (size_t i = 0; i < ps.polygons.size(); i++) {
const PolySet::Polygon *poly = &ps.polygons[i];
QHash<int,int> fc;
bool facet_is_degenerated = false;
for (size_t j = 0; j < poly->size(); j++) {
const Vector3d &p = poly->at(j);
int v = vertices_idx.data(p[0], p[1], p[2]);
if (fc[v]++ > 0)
facet_is_degenerated = true;
}
if (!facet_is_degenerated)
B.begin_facet();
#ifdef GEN_SURFACE_DEBUG
printf("F:");
#endif
for (size_t j = 0; j < poly->size(); j++) {
const Vector3d &p = poly->at(j);
#ifdef GEN_SURFACE_DEBUG
printf(" %d (%f,%f,%f)", vertices_idx.data(p[0], p[1], p[2]), p[0], p[1], p[2]);
#endif
if (!facet_is_degenerated)
B.add_vertex_to_facet(vertices_idx.data(p[0], p[1], p[2]));
}
#ifdef GEN_SURFACE_DEBUG
if (facet_is_degenerated)
printf(" (degenerated)");
printf("\n");
#endif
if (!facet_is_degenerated)
B.end_facet();
}
#ifdef GEN_SURFACE_DEBUG
printf("====================\n");
#endif
B.end_surface();
#undef PointKey
}
};
CGAL_Polyhedron *createPolyhedronFromPolySet(const PolySet &ps)
{
CGAL_Polyhedron *P = NULL;
CGAL::Failure_behaviour old_behaviour = CGAL::set_error_behaviour(CGAL::THROW_EXCEPTION);
try {
P = new CGAL_Polyhedron;
CGAL_Build_PolySet builder(ps);
P->delegate(builder);
}
catch (CGAL::Assertion_exception e) {
PRINTF("CGAL error in CGAL_Build_PolySet: %s", e.what());
CGAL::set_error_behaviour(old_behaviour);
}
return P;
}
#endif /* ENABLE_CGAL */
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