550 lines
19 KiB
C
550 lines
19 KiB
C
|
// Copyright (c) 2013,2014,2015 GeometryFactory (France).
|
||
|
|
// 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) : Ilker O. Yaz and Sebastien Loriot
|
||
|
|
|
||
|
|
#ifndef CGAL_POLYGON_MESH_SLICER_H
|
||
|
|
#define CGAL_POLYGON_MESH_SLICER_H
|
||
|
|
|
||
|
|
#include <CGAL/license/Polygon_mesh_processing/miscellaneous.h>
|
||
|
|
|
||
|
|
|
||
|
|
#include <CGAL/AABB_tree.h>
|
||
|
|
#include <CGAL/AABB_traits.h>
|
||
|
|
#include <CGAL/AABB_halfedge_graph_segment_primitive.h>
|
||
|
|
#include <CGAL/tuple.h>
|
||
|
|
|
||
|
|
#include <vector>
|
||
|
|
#include <set>
|
||
|
|
|
||
|
|
#include <boost/foreach.hpp>
|
||
|
|
#include <boost/graph/adjacency_list.hpp>
|
||
|
|
#include <CGAL/Polygon_mesh_processing/internal/Polygon_mesh_slicer/Traversal_traits.h>
|
||
|
|
#include <CGAL/Polygon_mesh_processing/internal/Polygon_mesh_slicer/Axis_parallel_plane_traits.h>
|
||
|
|
|
||
|
|
#include <boost/variant.hpp>
|
||
|
|
|
||
|
|
#include <CGAL/boost/graph/split_graph_into_polylines.h>
|
||
|
|
|
||
|
|
namespace CGAL {
|
||
|
|
|
||
|
|
/// \ingroup PkgPolygonMeshProcessing
|
||
|
|
/// Function object that computes the intersection of a plane with
|
||
|
|
/// a triangulated surface mesh.
|
||
|
|
///
|
||
|
|
/// \tparam TriangleMesh a triangulated surface mesh, model of `FaceGraph` and `HalfedgeListGraph`
|
||
|
|
/// \tparam Traits a model of `AABBGeomTraits`
|
||
|
|
/// \tparam VertexPointMap a model of `ReadablePropertyMap` with
|
||
|
|
/// `boost::graph_traits<TriangleMesh>::%vertex_descriptor` as key and
|
||
|
|
/// `Traits::Point_3` as value type.
|
||
|
|
/// The default is `typename boost::property_map< TriangleMesh, vertex_point_t>::%type`.
|
||
|
|
/// \tparam AABBTree must be an instantiation of `CGAL::AABB_tree` able to handle
|
||
|
|
/// the edges of `TriangleMesh`, having its `edge_descriptor` as primitive id.
|
||
|
|
/// The default is `CGAL::AABB_tree<CGAL::AABB_traits<
|
||
|
|
/// Traits, CGAL::AABB_halfedge_graph_segment_primitive<TriangleMesh> > >`
|
||
|
|
/// \tparam UseParallelPlaneOptimization if `true`, the code will use specific
|
||
|
|
/// predicates and constructions in case the functor is called with a plane
|
||
|
|
/// orthogonal to a frame axis, the non-null coefficient being 1 or -1.
|
||
|
|
/// The default is `true`.
|
||
|
|
///
|
||
|
|
/// The implemenation of this class depends on the package \ref PkgAABB_treeSummary.
|
||
|
|
/// \todo Shall we document more in details what is required?
|
||
|
|
/// `Traits` must provide:
|
||
|
|
/// - `Plane_3`
|
||
|
|
/// - `Point_3`
|
||
|
|
/// - `Segment_3`
|
||
|
|
/// - `Oriented_side_3` with `Oriented_side operator()(Plane_3, Point_3)`
|
||
|
|
/// - `Do_intersect_3` with `boost::optional<variant<Point_3,Segment_3> operator()(Plane_3,Segment_3)`
|
||
|
|
/// - `Do_intersect_3` with `bool operator()(Plane_3, Bbox_3)`
|
||
|
|
///
|
||
|
|
/// \todo If we keep the traits for plane orthogonal to a frame axis, `Traits` must also provide:
|
||
|
|
/// - `FT`
|
||
|
|
/// - `Construct_cartesian_const_iterator_3` with `Iterator operator()(Point_3)` `Iterator` being a random access iterator with `FT` as value type
|
||
|
|
/// - `Construct_point_3` with `Point_3 operator()(FT,FT,FT)`; `Construct_source_3` with `const Point_3& operator()(Segment_3)`
|
||
|
|
/// - `Construct_target_3` with `const Point_3& operator()(Segment_3)`
|
||
|
|
///
|
||
|
|
/// \todo `_object()` functions must also be provided
|
||
|
|
template<class TriangleMesh,
|
||
|
|
class Traits,
|
||
|
|
class VertexPointMap = typename boost::property_map< TriangleMesh, vertex_point_t>::type,
|
||
|
|
class AABBTree = AABB_tree<
|
||
|
|
AABB_traits<Traits,
|
||
|
|
AABB_halfedge_graph_segment_primitive<TriangleMesh> > >,
|
||
|
|
bool UseParallelPlaneOptimization=true>
|
||
|
|
class Polygon_mesh_slicer
|
||
|
|
{
|
||
|
|
/// Polygon_mesh typedefs
|
||
|
|
typedef typename boost::graph_traits<TriangleMesh> graph_traits;
|
||
|
|
typedef typename graph_traits::vertex_descriptor vertex_descriptor;
|
||
|
|
typedef typename graph_traits::edge_descriptor edge_descriptor;
|
||
|
|
typedef typename graph_traits::halfedge_descriptor halfedge_descriptor;
|
||
|
|
typedef typename graph_traits::face_descriptor face_descriptor;
|
||
|
|
|
||
|
|
/// Geometric typedefs
|
||
|
|
typedef typename Traits::Plane_3 Plane_3;
|
||
|
|
typedef typename Traits::Segment_3 Segment_3;
|
||
|
|
typedef typename Traits::Point_3 Point_3;
|
||
|
|
typedef typename Traits::FT FT;
|
||
|
|
|
||
|
|
/// typedefs for internal graph to get connectivity of the polylines
|
||
|
|
typedef boost::variant<vertex_descriptor, edge_descriptor> AL_vertex_info;
|
||
|
|
typedef boost::adjacency_list <
|
||
|
|
boost::vecS,
|
||
|
|
boost::vecS,
|
||
|
|
boost::undirectedS,
|
||
|
|
AL_vertex_info > AL_graph;
|
||
|
|
typedef typename AL_graph::vertex_descriptor AL_vertex_descriptor;
|
||
|
|
typedef std::pair<AL_vertex_descriptor, AL_vertex_descriptor> AL_vertex_pair;
|
||
|
|
typedef std::map<vertex_descriptor, AL_vertex_descriptor> Vertices_map;
|
||
|
|
typedef std::pair<const vertex_descriptor,AL_vertex_descriptor> Vertex_pair;
|
||
|
|
/// Traversal traits
|
||
|
|
typedef Polygon_mesh_slicer_::Traversal_traits<
|
||
|
|
AL_graph,
|
||
|
|
TriangleMesh,
|
||
|
|
VertexPointMap,
|
||
|
|
typename AABBTree::AABB_traits,
|
||
|
|
Traits > General_traversal_traits;
|
||
|
|
|
||
|
|
typedef Polygon_mesh_slicer_::Traversal_traits<
|
||
|
|
AL_graph,
|
||
|
|
TriangleMesh,
|
||
|
|
VertexPointMap,
|
||
|
|
typename AABBTree::AABB_traits,
|
||
|
|
Polygon_mesh_slicer_::Axis_parallel_plane_traits<Traits>
|
||
|
|
> Axis_parallel_traversal_traits;
|
||
|
|
/// Auxiliary classes
|
||
|
|
// compare the faces using the halfedge descriptors
|
||
|
|
struct Compare_face{
|
||
|
|
TriangleMesh& m_tmesh;
|
||
|
|
Compare_face(TriangleMesh& tmesh)
|
||
|
|
:m_tmesh(tmesh)
|
||
|
|
{}
|
||
|
|
|
||
|
|
bool operator()(halfedge_descriptor hd1, halfedge_descriptor hd2) const
|
||
|
|
{
|
||
|
|
return face(hd1,m_tmesh) < face(hd2,m_tmesh);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
typedef std::map< halfedge_descriptor, AL_vertex_pair, Compare_face > AL_edge_map;
|
||
|
|
|
||
|
|
template <class OutputIterator, class Traits_>
|
||
|
|
struct Polyline_visitor{
|
||
|
|
AL_graph& al_graph;
|
||
|
|
TriangleMesh& m_tmesh;
|
||
|
|
const Plane_3& m_plane;
|
||
|
|
VertexPointMap m_vpmap;
|
||
|
|
typename Traits_::Intersect_3 intersect_3;
|
||
|
|
OutputIterator out;
|
||
|
|
|
||
|
|
Polyline_visitor( TriangleMesh& tmesh,
|
||
|
|
AL_graph& al_graph,
|
||
|
|
const Plane_3& plane,
|
||
|
|
VertexPointMap vpmap,
|
||
|
|
const Traits_& traits,
|
||
|
|
OutputIterator out)
|
||
|
|
: al_graph(al_graph)
|
||
|
|
, m_tmesh(tmesh)
|
||
|
|
, m_plane(plane)
|
||
|
|
, m_vpmap(vpmap)
|
||
|
|
, intersect_3( traits.intersect_3_object() )
|
||
|
|
, out(out)
|
||
|
|
{}
|
||
|
|
|
||
|
|
std::vector< Point_3 > current_poly;
|
||
|
|
void start_new_polyline()
|
||
|
|
{
|
||
|
|
current_poly.clear();
|
||
|
|
}
|
||
|
|
void add_node(AL_vertex_descriptor node_id)
|
||
|
|
{
|
||
|
|
AL_vertex_info v = al_graph[node_id];
|
||
|
|
if (const vertex_descriptor* vd_ptr = boost::get<vertex_descriptor>(&v) )
|
||
|
|
{
|
||
|
|
current_poly.push_back( get(m_vpmap, *vd_ptr) );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
edge_descriptor ed = boost::get<edge_descriptor>(v);
|
||
|
|
Segment_3 s(
|
||
|
|
get(m_vpmap, source(ed, m_tmesh)),
|
||
|
|
get(m_vpmap,target(ed, m_tmesh))
|
||
|
|
);
|
||
|
|
typename cpp11::result_of<typename Traits_::Intersect_3(Plane_3, Segment_3)>::type
|
||
|
|
inter = intersect_3(m_plane, s);
|
||
|
|
CGAL_assertion(inter != boost::none);
|
||
|
|
const Point_3* pt_ptr = boost::get<Point_3>(&(*inter));
|
||
|
|
current_poly.push_back( *pt_ptr );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void end_polyline()
|
||
|
|
{
|
||
|
|
CGAL_assertion(!current_poly.empty());
|
||
|
|
*out++=current_poly;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
/// member variables
|
||
|
|
const AABBTree* m_tree_ptr;
|
||
|
|
TriangleMesh& m_tmesh;
|
||
|
|
VertexPointMap m_vpmap;
|
||
|
|
Traits m_traits;
|
||
|
|
bool m_own_tree;
|
||
|
|
|
||
|
|
/// Convenience graph functions
|
||
|
|
edge_descriptor next_edge(edge_descriptor ed) const
|
||
|
|
{
|
||
|
|
return edge( next( halfedge(ed, m_tmesh), m_tmesh), m_tmesh );
|
||
|
|
}
|
||
|
|
|
||
|
|
edge_descriptor next_of_opposite_edge(edge_descriptor ed) const
|
||
|
|
{
|
||
|
|
return edge( next( opposite( halfedge(ed, m_tmesh), m_tmesh), m_tmesh), m_tmesh );
|
||
|
|
}
|
||
|
|
|
||
|
|
face_descriptor opposite_face(edge_descriptor ed) const
|
||
|
|
{
|
||
|
|
return face( opposite( halfedge(ed, m_tmesh), m_tmesh), m_tmesh);
|
||
|
|
}
|
||
|
|
/// Other private functions
|
||
|
|
/// handle edge insertion in the adjacency_list graph
|
||
|
|
/// we add an edge betweem two edge_descriptor if they
|
||
|
|
/// share a common facet
|
||
|
|
void update_al_graph_connectivity(
|
||
|
|
edge_descriptor ed,
|
||
|
|
AL_vertex_descriptor vd,
|
||
|
|
AL_edge_map& al_edge_map,
|
||
|
|
AL_graph& al_graph) const
|
||
|
|
{
|
||
|
|
typename AL_edge_map::iterator itm;
|
||
|
|
bool new_insertion;
|
||
|
|
|
||
|
|
halfedge_descriptor hd=halfedge(ed, m_tmesh);
|
||
|
|
|
||
|
|
if (face(hd, m_tmesh)!=graph_traits::null_face())
|
||
|
|
{
|
||
|
|
cpp11::tie(itm, new_insertion) =
|
||
|
|
al_edge_map.insert( std::pair< halfedge_descriptor, AL_vertex_pair >
|
||
|
|
(hd, AL_vertex_pair(vd, AL_graph::null_vertex())) );
|
||
|
|
if (!new_insertion)
|
||
|
|
{
|
||
|
|
CGAL_assertion(itm->second.second==AL_graph::null_vertex());
|
||
|
|
itm->second.second=vd;
|
||
|
|
add_edge( itm->second.first,
|
||
|
|
itm->second.second,
|
||
|
|
al_graph);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
hd=opposite(hd, m_tmesh);
|
||
|
|
if (face(hd, m_tmesh)!=graph_traits::null_face())
|
||
|
|
{
|
||
|
|
cpp11::tie(itm, new_insertion) =
|
||
|
|
al_edge_map.insert( std::pair< halfedge_descriptor, AL_vertex_pair >
|
||
|
|
(hd, AL_vertex_pair(vd, AL_graph::null_vertex())) );
|
||
|
|
if (!new_insertion)
|
||
|
|
{
|
||
|
|
CGAL_assertion(itm->second.second==AL_graph::null_vertex());
|
||
|
|
itm->second.second=vd;
|
||
|
|
add_edge( itm->second.first,
|
||
|
|
itm->second.second,
|
||
|
|
al_graph);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
std::pair<int, FT>
|
||
|
|
axis_parallel_plane_info(const Plane_3& plane) const
|
||
|
|
{
|
||
|
|
FT a = m_traits.compute_a_3_object()(plane);
|
||
|
|
FT b = m_traits.compute_b_3_object()(plane);
|
||
|
|
FT c = m_traits.compute_c_3_object()(plane);
|
||
|
|
FT d = m_traits.compute_d_3_object()(plane);
|
||
|
|
|
||
|
|
if (a==0)
|
||
|
|
{
|
||
|
|
if (b==0)
|
||
|
|
{
|
||
|
|
if (c==1 || c==-1)
|
||
|
|
return std::pair<int,FT>(2, -d*c); /// z=-d
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (c==0 && (b==1 || b==-1))
|
||
|
|
return std::pair<int,FT>(1, -d*b); /// y=-d
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
if (b==0 && c==0 && ( a==1 || a==-1))
|
||
|
|
return std::pair<int,FT>(0, -d*a); /// x=-d
|
||
|
|
return std::pair<int,FT>(-1, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructor using `edges(tmesh)` to initialize the
|
||
|
|
* internal `AABB_tree`.
|
||
|
|
* @param tmesh the triangulated surface mesh to be sliced.
|
||
|
|
* It must be valid and non modified as long
|
||
|
|
* as the functor is used.
|
||
|
|
* @param vpmap an instance of the vertex point property map associated to `tmesh`
|
||
|
|
* @param traits a traits class instance, can be omitted
|
||
|
|
*/
|
||
|
|
Polygon_mesh_slicer(const TriangleMesh& tmesh,
|
||
|
|
VertexPointMap vpmap,
|
||
|
|
const Traits& traits = Traits())
|
||
|
|
: m_tmesh(const_cast<TriangleMesh&>(tmesh))
|
||
|
|
, m_vpmap(vpmap)
|
||
|
|
, m_traits(traits)
|
||
|
|
, m_own_tree(true)
|
||
|
|
{
|
||
|
|
m_tree_ptr = new AABBTree(edges(m_tmesh).first,
|
||
|
|
edges(m_tmesh).second,
|
||
|
|
m_tmesh,
|
||
|
|
m_vpmap);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructor using a pre-built `AABB_tree` of edges provided by the user.
|
||
|
|
* @param tmesh the triangulated surface mesh to be sliced.
|
||
|
|
* It must be valid and non modified as long
|
||
|
|
* as the functor is used.
|
||
|
|
* @param tree must be initialized with all the edges of `tmesh`
|
||
|
|
* @param vpmap an instance of the vertex point property map associated to `tmesh`
|
||
|
|
* @param traits a traits class instance, can be omitted
|
||
|
|
*/
|
||
|
|
Polygon_mesh_slicer(const TriangleMesh& tmesh,
|
||
|
|
const AABBTree& tree,
|
||
|
|
VertexPointMap vpmap,
|
||
|
|
const Traits& traits = Traits())
|
||
|
|
: m_tree_ptr(&tree)
|
||
|
|
, m_tmesh(const_cast<TriangleMesh&>(tmesh))
|
||
|
|
, m_vpmap(vpmap)
|
||
|
|
, m_traits(traits)
|
||
|
|
, m_own_tree(false)
|
||
|
|
{ }
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructor using `edges(tmesh)` to initialize the
|
||
|
|
* internal `AABB_tree`. The vertex point property map used
|
||
|
|
* is `get(CGAL::vertex_point, tmesh)`
|
||
|
|
* @param tmesh the triangulated surface mesh to be sliced.
|
||
|
|
* It must be valid and non modified as long
|
||
|
|
* as the functor is used.
|
||
|
|
* @param traits a traits class instance, can be omitted
|
||
|
|
*/
|
||
|
|
Polygon_mesh_slicer(const TriangleMesh& tmesh,
|
||
|
|
const Traits& traits = Traits())
|
||
|
|
: m_tmesh(const_cast<TriangleMesh&>(tmesh))
|
||
|
|
, m_vpmap(get(boost::vertex_point, m_tmesh))
|
||
|
|
, m_traits(traits)
|
||
|
|
, m_own_tree(true)
|
||
|
|
{
|
||
|
|
m_tree_ptr = new AABBTree(edges(m_tmesh).first,
|
||
|
|
edges(m_tmesh).second,
|
||
|
|
m_tmesh,
|
||
|
|
m_vpmap);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructor using a `AABB_tree` provided by the user.
|
||
|
|
* The vertex point property map used is `get(CGAL::vertex_point, tmesh)`
|
||
|
|
* @param tmesh the triangulated surface mesh to be sliced.
|
||
|
|
* It must be valid and non modified as long
|
||
|
|
* as the functor is used.
|
||
|
|
* @param tree must be initialized with all the edges of `tmesh`
|
||
|
|
* @param traits a traits class instance, can be omitted
|
||
|
|
*/
|
||
|
|
Polygon_mesh_slicer(const TriangleMesh& tmesh,
|
||
|
|
const AABBTree& tree,
|
||
|
|
const Traits& traits = Traits())
|
||
|
|
: m_tree_ptr(&tree)
|
||
|
|
, m_tmesh(const_cast<TriangleMesh&>(tmesh))
|
||
|
|
, m_vpmap(get(boost::vertex_point, m_tmesh))
|
||
|
|
, m_traits(traits)
|
||
|
|
, m_own_tree(false)
|
||
|
|
{ }
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Constructs the intersecting polylines of `plane` with the input triangulated surface mesh.
|
||
|
|
* @tparam OutputIterator an output iterator accepting polylines.
|
||
|
|
* A polyline is provided as `std::vector<Traits::Point_3>`.
|
||
|
|
* A polyline is closed if its first and last point are identical.
|
||
|
|
* @param plane the plane to intersect the triangulated surface mesh with
|
||
|
|
* @param out output iterator of polylines
|
||
|
|
*/
|
||
|
|
template <class OutputIterator>
|
||
|
|
OutputIterator operator() (const Plane_3& plane,
|
||
|
|
OutputIterator out) const
|
||
|
|
{
|
||
|
|
CGAL_precondition(!plane.is_degenerate());
|
||
|
|
|
||
|
|
// containers for storing edges wrt their position with the plane
|
||
|
|
std::set<edge_descriptor> all_coplanar_edges;
|
||
|
|
std::vector<edge_descriptor> iedges;
|
||
|
|
Vertices_map vertices;
|
||
|
|
|
||
|
|
// get all edges intersected by the plane and classify them
|
||
|
|
|
||
|
|
std::pair<int, FT> app_info = axis_parallel_plane_info(plane);
|
||
|
|
if (!UseParallelPlaneOptimization || app_info.first==-1)
|
||
|
|
{
|
||
|
|
General_traversal_traits ttraits(
|
||
|
|
all_coplanar_edges,
|
||
|
|
iedges,
|
||
|
|
vertices,
|
||
|
|
m_tmesh,
|
||
|
|
m_vpmap,
|
||
|
|
m_tree_ptr->traits(),
|
||
|
|
m_traits);
|
||
|
|
m_tree_ptr->traversal(plane, ttraits);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
Polygon_mesh_slicer_::Axis_parallel_plane_traits<Traits>
|
||
|
|
traits(app_info.first, app_info.second, m_traits);
|
||
|
|
|
||
|
|
Axis_parallel_traversal_traits ttraits(
|
||
|
|
all_coplanar_edges,
|
||
|
|
iedges,
|
||
|
|
vertices,
|
||
|
|
m_tmesh,
|
||
|
|
m_vpmap,
|
||
|
|
m_tree_ptr->traits(),
|
||
|
|
traits);
|
||
|
|
m_tree_ptr->traversal(plane, ttraits);
|
||
|
|
}
|
||
|
|
|
||
|
|
// init output graph
|
||
|
|
AL_graph al_graph;
|
||
|
|
|
||
|
|
// add nodes for each vertex in the plane
|
||
|
|
BOOST_FOREACH(Vertex_pair& vdp, vertices)
|
||
|
|
{
|
||
|
|
vdp.second=add_vertex(al_graph);
|
||
|
|
al_graph[vdp.second]=vdp.first;
|
||
|
|
}
|
||
|
|
|
||
|
|
Compare_face less_face(m_tmesh);
|
||
|
|
AL_edge_map al_edge_map( less_face );
|
||
|
|
|
||
|
|
// Filter coplanar edges: we consider only coplanar edges incident to one non-coplanar facet
|
||
|
|
// for each such edge, add the corresponding nodes in the adjacency-list graph as well as
|
||
|
|
// the edge
|
||
|
|
BOOST_FOREACH(const edge_descriptor ed, all_coplanar_edges)
|
||
|
|
{
|
||
|
|
if ( face(halfedge(ed, m_tmesh), m_tmesh)==graph_traits::null_face() ||
|
||
|
|
opposite_face(ed)==graph_traits::null_face() ||
|
||
|
|
!all_coplanar_edges.count( next_edge(ed) ) ||
|
||
|
|
!all_coplanar_edges.count( next_of_opposite_edge(ed) ) )
|
||
|
|
{
|
||
|
|
typename Vertices_map::iterator it_insert1, it_insert2;
|
||
|
|
bool is_new;
|
||
|
|
|
||
|
|
// Each coplanar edge is connecting two nodes
|
||
|
|
// handle source
|
||
|
|
cpp11::tie(it_insert1, is_new) =
|
||
|
|
vertices.insert(
|
||
|
|
Vertex_pair(
|
||
|
|
source(ed,m_tmesh), AL_graph::null_vertex()
|
||
|
|
)
|
||
|
|
);
|
||
|
|
if (is_new)
|
||
|
|
{
|
||
|
|
it_insert1->second=add_vertex(al_graph);
|
||
|
|
al_graph[it_insert1->second]=it_insert1->first;
|
||
|
|
}
|
||
|
|
// handle target
|
||
|
|
cpp11::tie(it_insert2, is_new) =
|
||
|
|
vertices.insert(
|
||
|
|
Vertex_pair(
|
||
|
|
target(ed,m_tmesh), AL_graph::null_vertex()
|
||
|
|
)
|
||
|
|
);
|
||
|
|
if (is_new)
|
||
|
|
{
|
||
|
|
it_insert2->second=add_vertex(al_graph);
|
||
|
|
al_graph[it_insert2->second]=it_insert2->first;
|
||
|
|
}
|
||
|
|
// add the edge into the adjacency-list graph
|
||
|
|
CGAL_assertion( it_insert1->second!=AL_graph::null_vertex() );
|
||
|
|
CGAL_assertion( it_insert2->second!=AL_graph::null_vertex() );
|
||
|
|
add_edge(it_insert1->second, it_insert2->second, al_graph);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// for each edge intersected in its interior, creates a node in
|
||
|
|
// an adjacency-list graph and put an edge between two such nodes
|
||
|
|
// when the corresponding edges shares a common face
|
||
|
|
BOOST_FOREACH(edge_descriptor ed, iedges)
|
||
|
|
{
|
||
|
|
AL_vertex_descriptor vd=add_vertex(al_graph);
|
||
|
|
al_graph[vd]=ed;
|
||
|
|
update_al_graph_connectivity(ed, vd, al_edge_map, al_graph);
|
||
|
|
}
|
||
|
|
|
||
|
|
// If one of the node above is not connected in its two incident faces
|
||
|
|
// then it must be connected to a vertex (including those in the set
|
||
|
|
// of coplanar edges)
|
||
|
|
typedef std::pair<halfedge_descriptor, AL_vertex_pair> Halfedge_and_vertices;
|
||
|
|
BOOST_FOREACH(Halfedge_and_vertices hnv,al_edge_map)
|
||
|
|
{
|
||
|
|
if (hnv.second.second==AL_graph::null_vertex())
|
||
|
|
{
|
||
|
|
//get the edge and test opposite vertices (if the edge is not on the boundary)
|
||
|
|
vertex_descriptor vd = target( next(hnv.first, m_tmesh), m_tmesh);
|
||
|
|
typename Vertices_map::iterator itv=vertices.find(vd);
|
||
|
|
CGAL_assertion( itv!=vertices.end() );
|
||
|
|
add_edge(itv->second, hnv.second.first, al_graph);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
CGAL_assertion(num_vertices(al_graph)==iedges.size()+vertices.size());
|
||
|
|
|
||
|
|
// now assemble the edges of al_graph to define polylines,
|
||
|
|
// putting them in the output iterator
|
||
|
|
if (!UseParallelPlaneOptimization || app_info.first==-1)
|
||
|
|
{
|
||
|
|
Polyline_visitor<OutputIterator, Traits> visitor(m_tmesh, al_graph, plane, m_vpmap, m_traits, out);
|
||
|
|
split_graph_into_polylines(al_graph, visitor);
|
||
|
|
return visitor.out;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
typedef Polygon_mesh_slicer_::Axis_parallel_plane_traits<Traits> App_traits;
|
||
|
|
App_traits app_traits(app_info.first, app_info.second, m_traits);
|
||
|
|
|
||
|
|
Polyline_visitor<OutputIterator, App_traits> visitor
|
||
|
|
(m_tmesh, al_graph, plane, m_vpmap, app_traits, out);
|
||
|
|
split_graph_into_polylines(al_graph, visitor);
|
||
|
|
return visitor.out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
~Polygon_mesh_slicer()
|
||
|
|
{
|
||
|
|
if (m_own_tree) delete m_tree_ptr;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}// end of namespace CGAL
|
||
|
|
#endif //CGAL_POLYGON_MESH_SLICER_H
|