CGAL 6.1.1 - 3D Simplicial Mesh Data Structures

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Functions
Input/Output Functions
Reference Manual

##

The free functions that can be used to read and write meshes.

## Functions
template<class C3T3 >
bool | CGAL::IO::save_binary_file (std::ostream &os, const C3T3 &c3t3)
| outputs a mesh complex to the CGAL binary file format (`.binary.cgal`).
template<class C3T3 >
bool | CGAL::IO::load_binary_file (std::istream &is, C3T3 &c3t3)
| loads a mesh complex from a file written in CGAL binary file format (`.binary.cgal`).
template<class C3T3 >
void | CGAL::IO::output_to_medit (std::ostream &os, const C3T3 &c3t3, bool renumber_subdomain_indices, bool show_patches)
| outputs a mesh complex to the medit (`.mesh`) file format. See [1] for a comprehensive description of this file format.
template<typename T3 , typename NamedParameters = parameters::Default_named_parameters>
void | CGAL::IO::write_MEDIT (std::ostream &os, const T3 &t3, const NamedParameters &np=parameters::default_values())
| outputs a mesh complex to the medit (`.mesh`) file format.
template<typename T3 , typename CornerIndex , typename CurveIndex , typename NamedParameters = parameters::Default_named_parameters>
void | CGAL::IO::write_MEDIT (std::ostream &os, const CGAL::Mesh_complex_3_in_triangulation_3< T3, CornerIndex, CurveIndex > &c3t3, const NamedParameters &np=parameters::default_values())
| outputs a mesh complex to the medit (`.mesh`) file format.
template<typename T3 , typename NamedParameters = CGAL::parameters::Default_named_parameters>
bool | CGAL::IO::read_MEDIT (std::istream &in, T3 &t3, const NamedParameters &np=parameters::default_values())
| reads a mesh complex written in the medit (`.mesh`) file format.

## Function Documentation

## ◆ load_binary_file()

template<class C3T3 >

bool CGAL::IO::load_binary_file | ( | std::istream & | is,
|  | C3T3 & | c3t3
| ) |  |

`#include <CGAL/IO/File_binary_mesh_3.h>`

loads a mesh complex from a file written in CGAL binary file format (`.binary.cgal`).

Template Parameters

  C3T3 | Type of mesh complex, model of `MeshComplex_3InTriangulation_3`

Parameters

  is | the input stream, opened in binary mode
  c3t3 | the mesh complex

See also
  `CGAL::IO::save_binary_file()`

## ◆ output_to_medit()

template<class C3T3 >

void CGAL::IO::output_to_medit | ( | std::ostream & | os,
|  | const C3T3 & | c3t3,
|  | bool | renumber_subdomain_indices,
|  | bool | show_patches
| ) |  |

`#include <CGAL/IO/File_medit.h>`

outputs a mesh complex to the medit (`.mesh`) file format. See [1] for a comprehensive description of this file format.

Deprecated:
  This function is deprecated. Users should instead use `CGAL::IO::write_MEDIT()`

Parameters

  os | the output stream
  c3t3 | the mesh complex
  renumber_subdomain_indices | if `true`, labels of cells are renumbered into `[1..nb_of_labels]`
  show_patches | if `true`, patches are labeled with different labels than cells. If `false`, each surface facet is written twice, using the label of each adjacent cell.

See also
  Medit File Format

## ◆ read_MEDIT()

template<typename T3 , typename NamedParameters = CGAL::parameters::Default_named_parameters>

bool CGAL::IO::read_MEDIT | ( | std::istream & | in,
|  | T3 & | t3,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/IO/File_medit.h>`

reads a mesh complex written in the medit (`.mesh`) file format.

See [1] for a comprehensive description of this file format.

Template Parameters

  T3 | can be instantiated with any 3D triangulation of CGAL provided that its vertex and cell base class are models of the concepts `MeshVertexBase_3` and `MeshCellBase_3`, respectively.
  NamedParameters | a sequence of Named Parameters

Parameters

  in | the input stream
  t3 | the triangulation
  np | optional Named Parameters described below

Optional Named Parameters

  indicates whether output warnings and error messages should be printed or not. Type: Boolean Default: `false` |
  allows the construction of a triangulation with non-manifold edges and non manifold vertices. The triangulation is invalid if this situation is met, so it should be used only in advanced cases, and the triangulation will be hardly usable. Type: bool Default: false |

Returns
  `true` if the connectivity of the triangulation could be built consistently from `in`, and `false` if the triangulation is empty, or if the connectivity of `t3` could not be built. If `false` is returned, `t3` is empty when the function returns.

This function reads the data about vertices, surface facets, and triangulation cells from `in`, and builds a valid `T3` from it.

Note that a valid 3D triangulation of CGAL must have a valid data structure (see `TriangulationDataStructure_3`), positively oriented cells, and cover the geometric convex hull of all points in `t3`.

Examples
  SMDS_3/c3t3_example.cpp.

## ◆ save_binary_file()

template<class C3T3 >

bool CGAL::IO::save_binary_file | ( | std::ostream & | os,
|  | const C3T3 & | c3t3
| ) |  |

`#include <CGAL/IO/File_binary_mesh_3.h>`

outputs a mesh complex to the CGAL binary file format (`.binary.cgal`).

Template Parameters

  C3T3 | Type of mesh complex, model of `MeshComplex_3InTriangulation_3`

Parameters

  os | the output stream, opened in binary mode
  c3t3 | the mesh complex

See also
  `CGAL::IO::load_binary_file()`

## ◆ write_MEDIT() [1/2]

template<typename T3 , typename CornerIndex , typename CurveIndex , typename NamedParameters = parameters::Default_named_parameters>

void CGAL::IO::write_MEDIT | ( | std::ostream & | os,
|  | const CGAL::Mesh_complex_3_in_triangulation_3< T3, CornerIndex, CurveIndex > & | c3t3,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/IO/File_medit.h>`

outputs a mesh complex to the medit (`.mesh`) file format.

See [1] for a comprehensive description of this file format.

Template Parameters

  T3 | can be instantiated with any 3D triangulation of CGAL provided that its vertex and cell base class are models of the concepts `MeshVertexBase_3` and `MeshCellBase_3`, respectively.
  CornerIndex | is the type of the indices for corners
  CurveIndex | is the type of the indices for curves
  NamedParameters | a sequence of Named Parameters

Parameters

  os | the output stream
  c3t3 | the mesh complex
  np | an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

  If `true`, all the cells in `t3` are written in `os`, whether they belong to the complex or not. Otherwise, only the cells `c` for which `c->subdomain_index() != Subdomain_index()` are written. Type: Boolean Default: `true` Extra: If the complex does not form a topological sphere, this parameter must be set to `true` for the file to be readable by `read_MEDIT()`. Otherwise the underlying triangulation data structure will not be valid. |
  If `true`, all the vertices in `t3` are written in `os`. Otherwise, only the vertices that belong to a cell `c` for which `c->subdomain_index() != Subdomain_index()` are written Type: Boolean Default: `true` Extra: If `all_cells` is `true`, the value of this parameter is ignored and all vertices are written in `os`. If the complex does not form a topological sphere, it must be set to `true` for the file to be readable by `read_MEDIT()`. Otherwise the underlying triangulation data structure will not be valid. |
  If `true`, labels of cells are rebound into `[1..nb_of_labels]` Type: Boolean Default: `false` |
  If `true`, patches are labeled with different labels than cells. If `false`, each surface facet is written twice, using the label of each adjacent cell. Type: Boolean Default: `true` |

See also
  Medit File Format

## ◆ write_MEDIT() [2/2]

template<typename T3 , typename NamedParameters = parameters::Default_named_parameters>

void CGAL::IO::write_MEDIT | ( | std::ostream & | os,
|  | const T3 & | t3,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/IO/File_medit.h>`

outputs a mesh complex to the medit (`.mesh`) file format.

See [1] for a comprehensive description of this file format.

Template Parameters

  T3 | can 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.
  NamedParameters | a sequence of Named Parameters

Parameters

  os | the output stream
  t3 | the triangulation
  np | an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

  If `true`, all the cells in `t3` are written in `os`, whether they belong to the complex or not. Otherwise, only the cells `c` for which `c->subdomain_index() != Subdomain_index()` are written. Type: Boolean Default: `true` Extra: This parameter must be set to `true` for the file to be readable by `read_MEDIT()`. |
  If `true`, all the finite vertices in `t3` are written in `os`. Otherwise, only the vertices that belong to a cell `c` for which `c->subdomain_index() != Subdomain_index()` are written Type: Boolean Default: `true` Extra: If `all_cells` is `true`, the value of this parameter is ignored and all vertices are written in `os`. It must be set to `true` for the file to be readable by `read_MEDIT()`. |
  If `true`, labels of cells are rebound into `[1..nb_of_labels]` Type: Boolean Default: `false` |
  If `true`, patches are labeled with different labels than cells. If `false`, each surface facet is written twice, using the label of each adjacent cell. Type: Boolean Default: `true` |

See also
  Medit File Format

Examples
  SMDS_3/c3t3_example.cpp, and SMDS_3/tetrahedron_soup_to_c3t3_example.cpp.