Intersection Functions

Functions to test if there are self intersections, and to report faces that do intersect.

Functions
template<class PolylineRange >
bool	CGAL::Polygon_mesh_processing::do_intersect (const PolylineRange &polylines1, const PolylineRange &polylines2)
	returns true if there exists a segment of a polyline of polylines1 and a segment of a polyline of polylines2 which intersect, and false otherwise. More...
template<class Polyline >
bool	CGAL::Polygon_mesh_processing::do_intersect (const Polyline &polyline1, const Polyline &polyline2)
	returns true if there exists a segment of polyline1 and a segment of polyline2 which intersect, and false otherwise. More...
template<class TriangleMesh , class NamedParameters1 = CGAL::parameters::Default_named_parameter, class NamedParameters2 = CGAL::parameters::Default_named_parameter>
bool	CGAL::Polygon_mesh_processing::do_intersect (const TriangleMesh &tm1, const TriangleMesh &tm2, const NamedParameters1 &np1=parameters::default_values(), const NamedParameters2 &np2=parameters::default_values())
	returns true if there exists a face of tm1 and a face of tm2 which intersect, and false otherwise. More...
template<class TriangleMesh , class PolylineRange , class NamedParameters = parameters::Default_named_parameters>
bool	CGAL::Polygon_mesh_processing::do_intersect (const TriangleMesh &tm, const PolylineRange &polylines, const NamedParameters &np=parameters::default_values())
	returns true if there exists a face of tm and a segment of a polyline of polylines which intersect, and false otherwise. More...
template<class TriangleMesh , class Polyline , class NamedParameters = CGAL::parameters::Default_named_parameters>
bool	CGAL::Polygon_mesh_processing::do_intersect (const TriangleMesh &tm, const Polyline &polyline, const NamedParameters &np=parameters::default_values())
	returns true if there exists a face of tm and a segment of polyline which intersect, and false otherwise. More...
template<class TriangleMeshRange , class OutputIterator , class NamedParameters , class NamedParametersRange >
OutputIterator	CGAL::Polygon_mesh_processing::intersecting_meshes (const TriangleMeshRange &range, OutputIterator out, const NamedParameters &np, const NamedParametersRange &nps)
	detects and reports all the pairs of meshes intersecting in a range of triangulated surface meshes. More...
template<class ConcurrencyTag = Sequential_tag, class TriangleMesh , class FaceRange , class FacePairOutputIterator , class NamedParameters = parameters::Default_named_parameters>
FacePairOutputIterator	CGAL::Polygon_mesh_processing::self_intersections (const FaceRange &face_range, const TriangleMesh &tmesh, FacePairOutputIterator out, const NamedParameters &np=parameters::default_values())
	collects intersections between a subset of faces of a triangulated surface mesh. More...
template<class ConcurrencyTag = Sequential_tag, class TriangleMesh , class FacePairOutputIterator , class NamedParameters = CGAL::parameters::Default_named_parameters>
FacePairOutputIterator	CGAL::Polygon_mesh_processing::self_intersections (const TriangleMesh &tmesh, FacePairOutputIterator out, const NamedParameters &np=parameters::default_values())
	collects intersections between all the faces of a triangulated surface mesh. More...
template<class ConcurrencyTag = Sequential_tag, class FaceRange , class TriangleMesh , class NamedParameters = parameters::Default_named_parameters>
bool	CGAL::Polygon_mesh_processing::does_self_intersect (const FaceRange &face_range, const TriangleMesh &tmesh, const NamedParameters &np=parameters::default_values())
	tests if a set of faces of a triangulated surface mesh self-intersects. More...
template<class ConcurrencyTag = Sequential_tag, class TriangleMesh , class NamedParameters = CGAL::parameters::Default_named_parameters>
bool	CGAL::Polygon_mesh_processing::does_self_intersect (const TriangleMesh &tmesh, const NamedParameters &np=parameters::default_values())
	tests if a triangulated surface mesh self-intersects. More...
template<class ConcurrencyTag = Sequential_tag, class PointRange , class TriangleRange , class TriangleIdPairOutputIterator , class NamedParameters = CGAL::parameters::Default_named_parameters>
TriangleIdPairOutputIterator	CGAL::Polygon_mesh_processing::triangle_soup_self_intersections (const PointRange &points, const TriangleRange &triangles, TriangleIdPairOutputIterator out, const NamedParameters &np=parameters::default_values())
	collects intersections between all the triangles in a triangle soup. More...
template<class ConcurrencyTag = Sequential_tag, class PointRange , class TriangleRange , class NamedParameters = CGAL::parameters::Default_named_parameters>
bool	CGAL::Polygon_mesh_processing::does_triangle_soup_self_intersect (const PointRange &points, const TriangleRange &triangles, const NamedParameters &np=parameters::default_values())
	tests if a triangle soup self-intersects. More...

Function Documentation

do_intersect() [1/5]

template<class PolylineRange >

bool CGAL::Polygon_mesh_processing::do_intersect	(	const PolylineRange &	polylines1,
		const PolylineRange &	polylines2
	)

#include <CGAL/Polygon_mesh_processing/intersection.h>

returns true if there exists a segment of a polyline of polylines1 and a segment of a polyline of polylines2 which intersect, and false otherwise.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Template Parameters

PolylineRange

a RandomAccessRange of RandomAccessRange of points. The point type must be from a 3D point from a CGAL Kernel. A polyline is defined as a sequence of points, each pair of contiguous points defines a segment of the polyline. If the first and last points of the polyline are identical, the polyline is closed.

Parameters

polylines1	the first range of polylines to check for intersections.
polylines2	the second range of polylines to check for intersections.

do_intersect() [2/5]

template<class Polyline >

bool CGAL::Polygon_mesh_processing::do_intersect	(	const Polyline &	polyline1,
		const Polyline &	polyline2
	)

#include <CGAL/Polygon_mesh_processing/intersection.h>

returns true if there exists a segment of polyline1 and a segment of polyline2 which intersect, and false otherwise.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Template Parameters

Polyline

a RandomAccessRange of points. The point type must be from a 3D point type from CGAL Kernel. A polyline is defined as a sequence of points, each pair of contiguous points defines a segment of the polyline. If the first and last points of the polyline are identical, the polyline is closed.

Parameters

polyline1	the first polyline to check for intersections.
polyline2	the second polyline to check for intersections.

do_intersect() [3/5]

template<class TriangleMesh , class NamedParameters1 = CGAL::parameters::Default_named_parameter, class NamedParameters2 = CGAL::parameters::Default_named_parameter>

bool CGAL::Polygon_mesh_processing::do_intersect	(	const TriangleMesh &	tm1,
		const TriangleMesh &	tm2,
		const NamedParameters1 &	np1 = parameters::default_values(),
		const NamedParameters2 &	np2 = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/intersection.h>

returns true if there exists a face of tm1 and a face of tm2 which intersect, and false otherwise.

If do_overlap_test_of_bounded_sides is set to true, the overlap of bounded sides are tested as well. In that case, the meshes must be closed. This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tm1)

CGAL::is_triangle_mesh(tm2)

!do_overlap_test_of_bounded_sides || CGAL::is_closed(tm1)

!do_overlap_test_of_bounded_sides || CGAL::is_closed(tm2)

Template Parameters

TriangleMesh	a model of FaceListGraph
NamedParameters1	a sequence of Named Parameters for tm1
NamedParameters2	a sequence of Named Parameters for tm2

Parameters

tm1	the first triangulated surface mesh to check for intersections
tm2	the second triangulated surface mesh to check for intersections
np1	an optional sequence of Named Parameters among the ones listed below
np2	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tm1 (tm2) Type: a class model of ReadablePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tm1 (tm2)) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tm1 (tm2) Extra: Both vertex point maps must have the same value type
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type. Extra: np1 only
do_overlap_test_of_bounded_sides If true, also tests the overlap of the bounded sides of tm1 and tm2. If false, only the intersection of surface triangles is tested. Type: Boolean Default: false

See also

intersecting_meshes()

do_intersect() [4/5]

template<class TriangleMesh , class PolylineRange , class NamedParameters = parameters::Default_named_parameters>

bool CGAL::Polygon_mesh_processing::do_intersect	(	const TriangleMesh &	tm,
		const PolylineRange &	polylines,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/intersection.h>

returns true if there exists a face of tm and a segment of a polyline of polylines which intersect, and false otherwise.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tm)

Template Parameters

TriangleMesh	a model of FaceListGraph
PolylineRange	a RandomAccessRange of RandomAccessRange of points. The point type of the range must be the same as the value type of the vertex point map. A polyline is defined as a sequence of points, each pair of contiguous points defines a segment of the polyline. If the first and last points of the polyline are identical, the polyline is closed.
NamedParameters	a sequence of Named Parameters

Parameters

tm	the triangulated surface mesh to check for intersections
polylines	the range of polylines to check for intersections.
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tm Type: a class model of ReadWritePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tm) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tm.
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type.

do_intersect() [5/5]

template<class TriangleMesh , class Polyline , class NamedParameters = CGAL::parameters::Default_named_parameters>

bool CGAL::Polygon_mesh_processing::do_intersect	(	const TriangleMesh &	tm,
		const Polyline &	polyline,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/intersection.h>

returns true if there exists a face of tm and a segment of polyline which intersect, and false otherwise.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tm)

Template Parameters

TriangleMesh	a model of FaceListGraph
Polyline	a RandomAccessRange of points. The point type of the range must be the same as the value type of the vertex point map. A polyline is defined as a sequence of points, each pair of contiguous points defines a segment of the polyline. If the first and last points of the polyline are identical, the polyline is closed.
NamedParameters	a sequence of Named Parameters

Parameters

tm	the triangulated surface mesh to check for intersections
polyline	the polyline to check for intersections.
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tm Type: a class model of ReadWritePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tm) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tm.
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type.

does_self_intersect() [1/2]

template<class ConcurrencyTag = Sequential_tag, class FaceRange , class TriangleMesh , class NamedParameters = parameters::Default_named_parameters>

bool CGAL::Polygon_mesh_processing::does_self_intersect	(	const FaceRange &	face_range,
		const TriangleMesh &	tmesh,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/self_intersections.h>

tests if a set of faces of a triangulated surface mesh self-intersects.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tmesh)

Template Parameters

ConcurrencyTag	enables sequential versus parallel algorithm. Possible values are Sequential_tag, Parallel_tag, and Parallel_if_available_tag.
FaceRange	a range of face_descriptor
TriangleMesh	a model of FaceListGraph
NamedParameters	a sequence of Named Parameters

Parameters

face_range	the set of faces to test for self-intersection
tmesh	the triangulated surface mesh to be tested
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tmesh Type: a class model of ReadWritePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tmesh) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tmesh.
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type.

Returns

true if the faces in face_range self-intersect

See also

self_intersections()

does_self_intersect() [2/2]

template<class ConcurrencyTag = Sequential_tag, class TriangleMesh , class NamedParameters = CGAL::parameters::Default_named_parameters>

bool CGAL::Polygon_mesh_processing::does_self_intersect	(	const TriangleMesh &	tmesh,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/self_intersections.h>

tests if a triangulated surface mesh self-intersects.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tmesh)

Template Parameters

ConcurrencyTag	enables sequential versus parallel algorithm. Possible values are Sequential_tag, Parallel_tag, and Parallel_if_available_tag.
TriangleMesh	a model of FaceListGraph
NamedParameters	a sequence of Named Parameters

Parameters

tmesh	the triangulated surface mesh to be tested
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tmesh Type: a class model of ReadWritePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tmesh) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tmesh.
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type.

Returns

true if tmesh self-intersects

See also

self_intersections()

does_triangle_soup_self_intersect()

template<class ConcurrencyTag = Sequential_tag, class PointRange , class TriangleRange , class NamedParameters = CGAL::parameters::Default_named_parameters>

bool CGAL::Polygon_mesh_processing::does_triangle_soup_self_intersect	(	const PointRange &	points,
		const TriangleRange &	triangles,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/self_intersections.h>

tests if a triangle soup self-intersects.

A triangle soup self-intersects if at least two triangles of the soup intersect. Two triangles of the soup are said to intersect if the corresponding geometric triangles intersect and the intersection is neither an edge nor a vertex of both triangles (with the same point ids, ignoring the orientation for an edge).

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Template Parameters

ConcurrencyTag	enables sequential versus parallel algorithm. Possible values are Sequential_tag, Parallel_tag, and Parallel_if_available_tag.
PointRange	a model of the concept RandomAccessContainer whose value type is the point type
TriangleRange	a model of the concept RandomAccessContainer whose value type is a model of the concept RandomAccessContainer whose value type is std::size_t
NamedParameters	a sequence of Named Parameters

Parameters

points	points of the soup of triangles
triangles	each element in the range describes a triangle using the indices of the points in points
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

point_map a property map associating points to the elements of the range points Type: a model of ReadablePropertyMap whose value type is a point type from a CGAL Kernel. Default: CGAL::Identity_property_map
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the point type of the point map.

Returns

true if the triangle soup self-intersects, and false otherwise.

See also

triangle_soup_self_intersections()

self_intersections()

does_self_intersect()

intersecting_meshes()

template<class TriangleMeshRange , class OutputIterator , class NamedParameters , class NamedParametersRange >

OutputIterator CGAL::Polygon_mesh_processing::intersecting_meshes	(	const TriangleMeshRange &	range,
		OutputIterator	out,
		const NamedParameters &	np,
		const NamedParametersRange &	nps
	)

#include <CGAL/Polygon_mesh_processing/intersection.h>

detects and reports all the pairs of meshes intersecting in a range of triangulated surface meshes.

A pair of meshes intersecting is put in the output iterator out as a std::pair<std::size_t, std::size_t>, each index referring to the index of the triangle mesh in the input range. If do_overlap_test_of_bounded_sides is true, the overlap of bounded sides are tested as well. In that case, the meshes must be closed. This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Template Parameters

TriangleMeshRange	a model of RandomAccessRange of triangulated surface meshes model of FaceListGraph.
OutputIterator	an output iterator in which std::pair<std::size_t, std::size_t> can be put.
NamedParameters	a sequence of Named Parameters for the algorithm
NamedParametersRange	a range of Named Parameters for the meshes.

Parameters

range	the range of triangulated surface meshes to be checked for intersections.
out	output iterator used to collect pairs of intersecting meshes.
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits, where Point is the value type of the vertex point map of the meshes
do_overlap_test_of_bounded_sides If true, reports also overlap of bounded sides of meshes. If false, only the intersection of surface triangles are tested. Type: Boolean Default: false

Parameters

nps	an optional range of sequences of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of a mesh tm Type: a class model of ReadablePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tm) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tm. Extra: All vertex point maps must have the same value type

See also

do_intersect()

self_intersections() [1/2]

template<class ConcurrencyTag = Sequential_tag, class TriangleMesh , class FaceRange , class FacePairOutputIterator , class NamedParameters = parameters::Default_named_parameters>

FacePairOutputIterator CGAL::Polygon_mesh_processing::self_intersections	(	const FaceRange &	face_range,
		const TriangleMesh &	tmesh,
		FacePairOutputIterator	out,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/self_intersections.h>

collects intersections between a subset of faces of a triangulated surface mesh.

Two faces are said to intersect if the corresponding triangles intersect and the intersection is neither an edge nor a vertex incident to both faces.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tmesh)

Template Parameters

ConcurrencyTag	enables sequential versus parallel algorithm. Possible values are Sequential_tag, Parallel_tag, and Parallel_if_available_tag.
FaceRange	a model of ConstRange with value type boost::graph_traits<TriangleMesh>::face_descriptor.
TriangleMesh	a model of FaceListGraph
FacePairOutputIterator	a model of OutputIterator holding objects of type std::pair<boost::graph_traits<TriangleMesh>::face_descriptor, boost::graph_traits<TriangleMesh>::face_descriptor>. It does not need to be thread-safe.
NamedParameters	a sequence of Named Parameters

Parameters

face_range	the range of faces to check for self-intersection.
tmesh	the triangulated surface mesh to be checked
out	output iterator to be filled with all pairs of non-adjacent faces that intersect
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tmesh Type: a class model of ReadWritePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tmesh) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tmesh.
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type.
maximum_number the maximum number of self intersections that will be detected and returned by the function. Type: unsigned int Default: No limit. Extra: In parallel mode, the number of returned self-intersections is at least maximum_number (and not exactly that number) as no strong synchronization is put on threads for performance reasons.

Returns

out

See also

does_self_intersect()

self_intersections() [2/2]

template<class ConcurrencyTag = Sequential_tag, class TriangleMesh , class FacePairOutputIterator , class NamedParameters = CGAL::parameters::Default_named_parameters>

FacePairOutputIterator CGAL::Polygon_mesh_processing::self_intersections	(	const TriangleMesh &	tmesh,
		FacePairOutputIterator	out,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/self_intersections.h>

collects intersections between all the faces of a triangulated surface mesh.

Two faces are said to intersect if the corresponding triangles intersect and the intersection is neither an edge nor a vertex incident to both faces.

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Precondition

CGAL::is_triangle_mesh(tmesh)

Template Parameters

ConcurrencyTag	enables sequential versus parallel algorithm. Possible values are Sequential_tag, Parallel_tag, and Parallel_if_available_tag.
TriangleMesh	a model of FaceListGraph
FacePairOutputIterator	a model of OutputIterator holding objects of type std::pair<boost::graph_traits<TriangleMesh>::face_descriptor, boost::graph_traits<TriangleMesh>::face_descriptor>. It does not need to be thread-safe.
NamedParameters	a sequence of Named Parameters

Parameters

tmesh	the triangulated surface mesh to be checked
out	output iterator to be filled with all pairs of non-adjacent faces that intersect. In case tmesh contains some degenerate faces, for each degenerate face f a pair (f,f) will be put in out before any other self intersection between non-degenerate faces. Note that these are the only pairs where degenerate faces will be reported.
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

vertex_point_map a property map associating points to the vertices of tmesh Type: a class model of ReadWritePropertyMap with boost::graph_traits<TriangleMesh>::vertex_descriptor as key type and Point_3 as value type Default: boost::get(CGAL::vertex_point, tmesh) Extra: If this parameter is omitted, an internal property map for CGAL::vertex_point_t should be available for the vertices of tmesh.
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the vertex point type.
maximum_number the maximum number of self intersections that will be detected and returned by the function. Type: unsigned int Default: No limit. Extra: In parallel mode, the number of returned self-intersections is at least maximum_number (and not exactly that number) as no strong synchronization is put on threads for performance reasons.

Returns

out

See also

does_self_intersect()

triangle_soup_self_intersections()

template<class ConcurrencyTag = Sequential_tag, class PointRange , class TriangleRange , class TriangleIdPairOutputIterator , class NamedParameters = CGAL::parameters::Default_named_parameters>

TriangleIdPairOutputIterator CGAL::Polygon_mesh_processing::triangle_soup_self_intersections	(	const PointRange &	points,
		const TriangleRange &	triangles,
		TriangleIdPairOutputIterator	out,
		const NamedParameters &	np = parameters::default_values()
	)

#include <CGAL/Polygon_mesh_processing/self_intersections.h>

collects intersections between all the triangles in a triangle soup.

Two triangles of the soup are said to intersect if the corresponding geometric triangles intersect and the intersection is neither an edge nor a vertex of both triangles (with the same point ids, ignoring the orientation for an edge).

This function depends on the package Intersecting Sequences of dD Iso-oriented Boxes.

Template Parameters

ConcurrencyTag	enables sequential versus parallel algorithm. Possible values are Sequential_tag, Parallel_tag, and Parallel_if_available_tag.
PointRange	a model of the concept RandomAccessContainer whose value type is the point type
TriangleRange	a model of the concept RandomAccessContainer whose value type is a model of the concept RandomAccessContainer whose value type is std::size_t
TriangleIdPairOutputIterator	a model of OutputIterator holding objects of type std::pair<std::size_t,std::size_t>
NamedParameters	a sequence of Named Parameters

Parameters

points	points of the soup of triangles
triangles	each element in the range describes a triangle using the indices of the points in points
out	output iterator to be filled with all pairs of ids of triangles intersecting (the id of a triangle is its position in triangles). In case the triangle soup contains some degenerate triangles, for each degenerate triangle t with id i a pair (i,i) will be put in out before any other self intersection between non-degenerate triangles. Note that these are the only pairs where degenerate triangles will be reported.
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

maximum_number the maximum number of self intersections that will be detected and returned by the function. Type: unsigned int Default: No limit. Extra: In parallel mode, the number of returned self-intersections is at least maximum_number (and not exactly that number) as no strong synchronization is put on threads for performance reasons.
point_map a property map associating points to the elements of the range points Type: a model of ReadablePropertyMap whose value type is a point type from a CGAL Kernel. Default: CGAL::Identity_property_map
geom_traits an instance of a geometric traits class Type: a class model of PMPSelfIntersectionTraits Default: a CGAL Kernel deduced from the point type, using CGAL::Kernel_traits Extra: The geometric traits class must be compatible with the point type of the point map.

Returns

out

See also

does_triangle_soup_self_intersect()

self_intersections()

does_self_intersect()