CGAL 6.0 - 3D Simplicial Mesh Data Structures
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CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex > Class Template Reference

#include <CGAL/Mesh_complex_3_in_triangulation_3.h>

Definition

template<typename Tr, typename CornerIndex, typename CurveIndex>
class CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex >

A data structure to represent and maintain a 3D complex embedded in a 3D triangulation.

The class Mesh_complex_3_in_triangulation_3 implements a data structure to store the 3D restricted Delaunay triangulation used by a mesh generation process.

This class is a model of the concept MeshComplexWithFeatures_3InTriangulation_3.

Template Parameters
Trcan be instantiated with any 3D triangulation of CGAL provided that its vertex and cell base class are models of the concepts SimplicialMeshVertexBase_3 and SimplicialMeshCellBase_3, respectively.
CornerIndexType of indices for corners (i.e. \( 0\)–dimensional features) of the discretized geometric domain. It must be a model of CopyConstructible, Assignable, DefaultConstructible and LessThanComparable. It must match the Corner_index of the model of the MeshDomainWithFeatures_3 concept when used for mesh generation.
CurveIndexType of indices for curves (i.e. \( 1\)-dimensional features) of the discretized geometric domain. It must be a model of CopyConstructible, Assignable, DefaultConstructible and LessThanComparable. The default constructed value must be the value for an edge which does not approximate a 1-dimensional feature of the geometric domain. It must match the Curve_index types of the model of the MeshDomainWithFeatures_3 concept when used for mesh generation.

Those two last template parameters default to int, so that they can be ignored if the domain used for mesh generation does not include 0 and 1-dimensionnal features (i.e is only a model of the concept MeshDomain_3).

Is model of
MeshComplexWithFeatures_3InTriangulation_3
See also
CGAL::make_mesh_3()
CGAL::refine_mesh_3()
MeshComplex_3InTriangulation_3
MeshComplexWithFeatures_3InTriangulation_3
SimplicialMeshCellBase_3,
SimplicialMeshVertexBase_3
Examples
SMDS_3/c3t3_example.cpp, and SMDS_3/tetrahedron_soup_to_c3t3_example.cpp.

Public Member Functions

void remove_isolated_vertices ()
 The tetrahedral mesh generation algorithm implemented in CGAL::make_mesh_3() and CGAL::refine_mesh_3() does not guarantee that all the points inserted by the algorithm are actually present in the final mesh.
 
template<typename OutputIterator >
OutputIterator adjacent_vertices_in_complex (const Vertex_handle &v, OutputIterator out) const
 fills out with incident edges (1-dimensional features of v).
 
bool has_incident_facets_in_complex (const Vertex_handle &v) const
 Returns true if the vertex v has is incident to at least a facet of the complex.
 

Types

typedef Tr Triangulation
 
typedef Tr::size_type size_type
 
typedef Tr::Point Point
 
typedef Tr::Edge Edge
 
typedef Tr::Facet Facet
 
typedef Tr::Vertex_handle Vertex_handle
 
typedef Tr::Cell_handle Cell_handle
 
typedef Tr::Vertex::Index Index
 Index type.
 
typedef Tr::Cell::Surface_patch_index Surface_patch_index
 Surface index type.
 
typedef Tr::Cell::Subdomain_index Subdomain_index
 Subdomain index type.
 
typedef CornerIndex Corner_index
 Corner index type.
 
typedef CurveIndex Curve_index
 Curve index type.
 

Traversal of the complex

typedef unspecified_type Cells_in_complex_iterator
 Iterator type to visit the cells of the 3D complex.
 
typedef unspecified_type Facets_in_complex_iterator
 Iterator type to visit the facets of the 2D complex.
 
typedef unspecified_type Edges_in_complex_iterator
 Iterator type to visit the edges of the 1D complex.
 
typedef unspecified_type Vertices_in_complex_iterator
 Iterator type to visit the vertices of the 0D complex.
 
typedef Iterator_range< unspecified_typeCells_in_complex
 Range type for iterating over all cells of the 3D complex, with a nested type iterator that has as value type Cell_handle.
 
typedef Iterator_range< unspecified_typeFacets_in_complex
 Range type for iterating over all facets of the 2D complex, with a nested type iterator that has as value type Facet.
 
typedef Iterator_range< unspecified_typeEdges_in_complex
 Range type for iterating over all cells of the 1D complex, with a nested type iterator that has as value type Edge.
 
typedef Iterator_range< unspecified_typeVertices_in_complex
 Range type for iterating over all vertices of the 0D complex, with a nested type iterator that has as value type Vertex_handle.
 

Creation

 Mesh_complex_3_in_triangulation_3 ()
 Constructor builds an empty 3D complex.
 
 Mesh_complex_3_in_triangulation_3 (const Self &rhs)
 Copy constructor.
 
 Mesh_complex_3_in_triangulation_3 (Self &&rhs)
 Move constructor.
 
Selfoperator= (Self rhs)
 Assignment operator, also serves as move-assignment.
 
void swap (Self &rhs)
 swaps this and rhs
 

Access Functions

const Triangulation & triangulation () const
 returns a const reference to the triangulation
 

Non const access

Triangulation & triangulation ()
 returns a reference to the triangulation
 

Modifiers

void clear ()
 clears data of the complex
 
void add_to_complex (const Cell_handle &cell, const Subdomain_index &index)
 adds cell cell to the 3D complex, with subdomain index index
 
void add_to_complex (const Facet &facet, const Surface_patch_index &index)
 adds facet facet to the 2D complex, with surface index index
 
void add_to_complex (const Cell_handle &cell, const int i, const Surface_patch_index &index)
 adds facet(cell, i) to the 2D complex, with surface index index
 
void add_to_complex (const Edge &e, const Curve_index &index)
 adds edge e to complex, with curve index index
 
void add_to_complex (const Vertex_handle &v1, const Vertex_handle &v2, const Curve_index &index)
 adds edge (v1, v2) to the 1D complex, with Curve_index index
 
void add_to_complex (const Vertex_handle &v, const Corner_index &index)
 marks vertex v as a corner of the complex
 
void remove_from_complex (const Cell_handle &cell)
 removes cell cell from the 3D complex
 
void remove_from_complex (const Facet &facet)
 removes facet facet from the 2D complex
 
void remove_from_complex (const Cell_handle &c, const int i)
 removes facet(cell, i) from the 2D complex
 
void remove_from_complex (const Edge &e)
 removes edge e from the 1D complex
 
void remove_from_complex (const Vertex_handle &v1, const Vertex_handle &v2)
 removes edge (v1,v2) from the 1D complex
 
void remove_from_complex (const Vertex_handle &v)
 removes vertex v from the complex
 
void set_index (const Vertex_handle &vertex, const Index &index) const
 sets the index of vertex vertex to index
 
void set_surface_patch_index (const Facet &f, const Surface_patch_index &index)
 sets the surface index of facet facet to index
 
void set_surface_patch_index (const Cell_handle &cell, const int i, const Surface_patch_index &index) const
 sets the surface index of facet(cell, i) to index
 
void set_subdomain_index (const Cell_handle &cell, const Subdomain_index &index) const
 sets the subdomain index of cell cell to index
 
void set_dimension (const Vertex_handle &vertex, int dimension) const
 sets the dimension of vertex vertex to dimension
 

Queries on the identifier of the face complex including triangulation cells, facets, and vertices.

Index index (const Vertex_handle &v) const
 returns the index of vertex v
 
Subdomain_index subdomain_index (const Cell_handle &cell) const
 returns the subdomain index of cell cell
 
Surface_patch_index surface_patch_index (const Facet &f) const
 returns the surface index of facet f
 
Surface_patch_index surface_patch_index (const Cell_handle &cell, const int i) const
 returns the surface index of facet(cell, i)
 
int in_dimension (const Vertex_handle &v) const
 returns the dimension of the lowest dimensional face of the input 3D complex that contains the vertex
 
Curve_index curve_index (const Edge &e) const
 returns the curve index of edge e
 
Curve_index curve_index (const Vertex_handle &v1, const Vertex_handle &v2) const
 returns the curve index of the edge formed by v1 and v2
 
Corner_index corner_index (const Vertex_handle &v) const
 returns the corner index of vertex v
 

Queries on the faces of the embedded complex

size_type number_of_cells_in_complex () const
 returns the number of cells which belong to the 3D complex
 
size_type number_of_cells () const
 returns the number of cells which belong to the 3D complex
 
size_type number_of_facets_in_complex () const
 returns the number of surface facets of the complex
 
size_type number_of_facets () const
 returns the number of surface facets of the complex
 
size_type number_of_edges_in_complex () const
 returns the number of edges of the complex
 
size_type number_of_edges () const
 returns the number of edges of the complex
 
size_type number_of_vertices_in_complex () const
 returns the number of corners of the complex
 
size_type number_of_corners () const
 returns the number of corners of the complex
 
bool is_in_complex (const Cell_handle &cell) const
 returns true if cell cell belongs to the 3D complex
 
bool is_in_complex (const Facet &facet) const
 returns true if facet facet belongs to the 2D complex
 
bool is_in_complex (const Cell_handle &cell, const int i) const
 returns true if facet (cell, i) belongs to the 2D complex
 
bool is_in_complex (const Edge &e) const
 returns true if edge e belongs to the 1D complex
 
bool is_in_complex (const Vertex_handle &v1, const Vertex_handle &v2) const
 returns true if edge (v1,v2) belongs to the 1D complex
 
bool is_in_complex (const Vertex_handle &v) const
 returns true if v is a 0-dimensionnal feature in the complex
 

I/O Functions

std::ostream & output_boundary_to_off (std::ostream &out) const
 outputs the outer boundary of the entire domain, with facets oriented outward.
 
std::ostream & output_boundary_to_off (std::ostream &out, Subdomain_index subdomain) const
 outputs the outer boundary of the selected subdomain, with facets oriented outward.
 
std::ostream & output_facets_in_complex_to_off (std::ostream &out) const
 outputs the surface facets, with a consistent orientation at the interface of two subdomains.
 
void output_to_medit (std::ostream &os) const
 outputs the mesh to os in Medit format.
 
void output_to_maya (std::ostream &os, bool surfaceOnly=true) const
 

Iterators

Cells_in_complex_iterator cells_in_complex_begin () const
 returns a Cells_in_complex_iterator to the first cell of the 3D complex
 
Cells_in_complex_iterator cells_in_complex_begin (const Subdomain_index &index) const
 returns a Cells_in_complex_iterator to the first cell of the 3D complex
 
Cells_in_complex_iterator cells_in_complex_end () const
 returns the past-the-end iterator for the cells of the 3D complex
 
Facets_in_complex_iterator facets_in_complex_begin () const
 returns a Facets_in_complex_iterator to the first facet of the 2D complex
 
Facets_in_complex_iterator facets_in_complex_begin (const Surface_patch_index &index) const
 returns a Facets_in_complex_iterator to the first facet of the 2D complex
 
Facets_in_complex_iterator facets_in_complex_end (const Surface_patch_index=Surface_patch_index()) const
 returns past-the-end iterator on facet of the 2D complex
 
Edges_in_complex_iterator edges_in_complex_begin () const
 returns a Edges_in_complex_iterator to the first edge of the 1D complex
 
Edges_in_complex_iterator edges_in_complex_begin (const Curve_index &index) const
 returns a Edges_in_complex_iterator to the first edge of the 1D complex
 
Edges_in_complex_iterator edges_in_complex_end (const Curve_index &=Curve_index()) const
 returns past-the-end iterator on edges of the 1D complex
 
Vertices_in_complex_iterator vertices_in_complex_begin () const
 returns a Vertices_in_complex_iterator to the first vertex of the 0D complex
 
Vertices_in_complex_iterator vertices_in_complex_begin (const Corner_index &index) const
 returns a Vertices_in_complex_iterator to the first vertex of the 0D complex
 
Vertices_in_complex_iterator vertices_in_complex_end () const
 returns past-the-end iterator on vertices of the 0D complex
 
Vertices_in_complex vertices_in_complex () const
 returns a range of iterators over vertices of the 0D complex
 
Edges_in_complex edges_in_complex () const
 returns a range of iterators over the edges of the 1D complex, starting at an arbitrary edge.
 
Facets_in_complex facets_in_complex () const
 returns a range of iterators over the facets of the 2D complex, starting at an arbitrary facet.
 
Cells_in_complex cells_in_complex () const
 returns a range of iterators over cells of the 3D complex.
 

Member Function Documentation

◆ adjacent_vertices_in_complex()

template<typename Tr , typename CI_ , typename CSI_ >
template<typename OutputIterator >
OutputIterator CGAL::Mesh_complex_3_in_triangulation_3< Tr, CI_, CSI_ >::adjacent_vertices_in_complex ( const Vertex_handle &  v,
OutputIterator  out 
) const

fills out with incident edges (1-dimensional features of v).

OutputIterator value type is std::pair<Vertex_handle,Curve_index>

Precondition
v->in_dimension() < 2

◆ cells_in_complex()

template<typename Tr , typename CornerIndex , typename CurveIndex >
Cells_in_complex CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex >::cells_in_complex ( ) const

returns a range of iterators over cells of the 3D complex.

Returns an empty range when triangulation().number_of_cells() == 0 or complex is empty.

Note
The value type of Cells_in_complex::iterator is Cell_handle.

◆ edges_in_complex()

template<typename Tr , typename CornerIndex , typename CurveIndex >
Edges_in_complex CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex >::edges_in_complex ( ) const

returns a range of iterators over the edges of the 1D complex, starting at an arbitrary edge.

Returns an empty range when t.dimension() < 2.

◆ facets_in_complex()

template<typename Tr , typename CornerIndex , typename CurveIndex >
Facets_in_complex CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex >::facets_in_complex ( ) const

returns a range of iterators over the facets of the 2D complex, starting at an arbitrary facet.

Returns an empty range when t.dimension() < 2.

◆ remove_isolated_vertices()

template<typename Tr , typename CornerIndex , typename CurveIndex >
void CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex >::remove_isolated_vertices ( )

The tetrahedral mesh generation algorithm implemented in CGAL::make_mesh_3() and CGAL::refine_mesh_3() does not guarantee that all the points inserted by the algorithm are actually present in the final mesh.

In most cases, all points are used, but if the geometry of the object has small features compared to the size of the simplices (triangles and tetrahedra), it might be that the Delaunay facets that are selected in the restricted Delaunay triangulation miss some vertices of the triangulation. The concurrent version of the tetrahedral mesh generation algorithm also inserts a small set of auxiliary vertices that belong to the triangulation but are isolated from the complex at the end of the meshing process.

This function removes these so-called isolated vertices, that belong to the triangulation but not to any simplex of the C3T3, from the triangulation.

◆ vertices_in_complex()

template<typename Tr , typename CornerIndex , typename CurveIndex >
Vertices_in_complex CGAL::Mesh_complex_3_in_triangulation_3< Tr, CornerIndex, CurveIndex >::vertices_in_complex ( ) const

returns a range of iterators over vertices of the 0D complex

Note
The value type of Vertices_in_complex::iterator is Vertex_handle.