CGAL 5.6.3 - CGAL and the Boost Graph Library

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Functions
OFF I/O Functions
CGAL and the Boost Graph Library Reference » I/O Functions

##

I/O Functions for the Object File Format (OFF).

## Functions
template<typename Graph , typename NamedParameters = CGAL::parameters::Default_named_parameters>
bool | CGAL::IO::read_OFF (std::istream &is, Graph &g, const NamedParameters &np=parameters::default_values())
| reads the graph `g` from data in the input stream, using the Object File Format (OFF).
template<typename Graph , typename NamedParameters = CGAL::parameters::Default_named_parameters>
bool | CGAL::IO::read_OFF (const std::string &fname, Graph &g, const NamedParameters &np=parameters::default_values())
| reads the graph `g` from the file `fname`, using the Object File Format (OFF).
template<typename Graph , typename NamedParameters = CGAL::parameters::Default_named_parameters>
bool | CGAL::IO::write_OFF (std::ostream &os, const Graph &g, const NamedParameters &np=parameters::default_values())
| writes the graph `g` in the output stream, using the Object File Format (OFF).
template<typename Graph , typename NamedParameters = CGAL::parameters::Default_named_parameters>
bool | CGAL::IO::write_OFF (const std::string &fname, const Graph &g, const NamedParameters &np=parameters::default_values())
| writes the graph `g` in the file `fname`, using the Object File Format (OFF).

## Function Documentation

## ◆ read_OFF() [1/2]

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

bool CGAL::IO::read_OFF | ( | const std::string & | fname,
|  | Graph & | g,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/boost/graph/IO/OFF.h>`

reads the graph `g` from the file `fname`, using the Object File Format (OFF).

The data is expected to represent a 2-manifold (possibly with borders).

This function reads the point property as well as vertex normals (NOFF), vertex and face colors (COFF), and texture vertex coordinates (TOFF). Those properties are stored in property maps that are passed through named parameters (see below), when passed.

Ignores comment lines which start with a hash, and lines with whitespace.

Attention
  The graph `g` is not cleared, and the data from the file are appended.

Template Parameters

  Graph | a model of `MutableFaceGraph`
  NamedParameters | a sequence of Named Parameters

Parameters

  fname | the name of the input file
  g | the graph to be built from the input data
  np | optional Named Parameters described below

Optional Named Parameters

  a property map associating points to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_3` as value type Default: `boost::get(CGAL::vertex_point, g)` Extra: If this parameter is omitted, an internal property map for `CGAL::vertex_point_t` must be available in `Graph`. |
  a property map associating normals to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Vector_3` as value type Default: vertex normals that may exist in the input will be ignored |
  a property map associating colors to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `CGAL::IO::Color` as value type Default: vertex colors that may exist in the input will be ignored |
  a property map associating textures to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_2` as value type Default: vertex textures that may exist in the input will be ignored |
  a property map associating colors to the faces of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::face_descriptor` as key type and `CGAL::IO::Color` as value type Default: face colors that may exist in the input will be ignored |
  whether extra information is printed when an incident occurs during reading Type: Boolean Default: `false` |

Returns
  `true` if reading was successful and the resulting mesh is valid, `false` otherwise.

See also
  Overloads of this function for specific models of the concept `FaceGraph`.

## ◆ read_OFF() [2/2]

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

bool CGAL::IO::read_OFF | ( | std::istream & | is,
|  | Graph & | g,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/boost/graph/IO/OFF.h>`

reads the graph `g` from data in the input stream, using the Object File Format (OFF).

The data is expected to represent a 2-manifold (possibly with borders).

This function reads the point property as well as vertex normals (NOFF), vertex and face colors (COFF), and texture vertex coordinates (TOFF). Those properties are stored in property maps that are passed through named parameters (see below), when passed.

Ignores comment lines which start with a hash, and lines with whitespace.

Attention
  The graph `g` is not cleared, and the data from the stream are appended.

Template Parameters

  Graph | a model of `MutableFaceGraph`
  NamedParameters | a sequence of Named Parameters

Parameters

  is | the input stream
  g | the graph to be built from the input data
  np | optional Named Parameters described below

Optional Named Parameters

  a property map associating points to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_3` as value type Default: `boost::get(CGAL::vertex_point, g)` Extra: If this parameter is omitted, an internal property map for `CGAL::vertex_point_t` must be available in `Graph`. |
  a property map associating normals to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Vector_3` as value type Default: vertex normals that may exist in the input will be ignored |
  a property map associating colors to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `CGAL::IO::Color` as value type Default: vertex colors that may exist in the input will be ignored |
  a property map associating textures to the vertices of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_2` as value type Default: vertex textures that may exist in the input will be ignored |
  a property map associating colors to the faces of `g` Type: a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::face_descriptor` as key type and `CGAL::IO::Color` as value type Default: face colors that may exist in the input will be ignored |
  whether extra information is printed when an incident occurs during reading Type: Boolean Default: `false` |

Returns
  `true` if reading was successful and the resulting mesh is valid, `false` otherwise.

See also
  Overloads of this function for specific models of the concept `FaceGraph`.

## ◆ write_OFF() [1/2]

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

bool CGAL::IO::write_OFF | ( | const std::string & | fname,
|  | const Graph & | g,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/boost/graph/IO/OFF.h>`

writes the graph `g` in the file `fname`, using the Object File Format (OFF).

Template Parameters

  Graph | a model of `FaceListGraph` and `HalfedgeListGraph`
  NamedParameters | a sequence of Named Parameters

Parameters

  fname | the name of the output file
  g | the graph to be written
  np | optional Named Parameters described below

Optional Named Parameters

  a property map associating points to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_3` as value type Default: `boost::get(CGAL::vertex_point, g)` Extra: If this parameter is omitted, an internal property map for `CGAL::vertex_point_t` must be available in `Graph`. |
  a property map associating normals to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Vector_3` as value type Default: no vertex normals in the output |
  a property map associating colors to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `CGAL::IO::Color` as value type Default: no vertex colors in the output |
  a property map associating textures to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_2` as value type Default: no vertex textures in the output |
  a property map associating colors to the faces of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::face_descriptor` as key type and `CGAL::IO::Color` as value type Default: no face colors in the output |
  a parameter used to set the precision (i.e. how many digits are generated) of the output stream Type: int Default: `6` |

Returns
  `true` if writing was successful, `false` otherwise.

See also
  Overloads of this function for specific models of the concept `FaceGraph`.

## ◆ write_OFF() [2/2]

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

bool CGAL::IO::write_OFF | ( | std::ostream & | os,
|  | const Graph & | g,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

`#include <CGAL/boost/graph/IO/OFF.h>`

writes the graph `g` in the output stream, using the Object File Format (OFF).

Template Parameters

  Graph | a model of `FaceListGraph` and `HalfedgeListGraph`
  NamedParameters | a sequence of Named Parameters

Parameters

  os | the output stream
  g | the graph to be written
  np | optional Named Parameters described below

Optional Named Parameters

  a property map associating points to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_3` as value type Default: `boost::get(CGAL::vertex_point, g)` Extra: If this parameter is omitted, an internal property map for `CGAL::vertex_point_t` must be available in `Graph`. |
  a property map associating normals to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Vector_3` as value type Default: no vertex normals in the output |
  a property map associating colors to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `CGAL::IO::Color` as value type Default: no vertex colors in the output |
  a property map associating textures to the vertices of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::vertex_descriptor` as key type and `Point_2` as value type Default: no vertex textures in the output |
  a property map associating colors to the faces of `g` Type: a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::face_descriptor` as key type and `CGAL::IO::Color` as value type Default: no face colors in the output |
  a parameter used to set the precision (i.e. how many digits are generated) of the output stream Type: int Default: the precision of the stream `os` |

Returns
  `true` if writing was successful, `false` otherwise.

See also
  Overloads of this function for specific models of the concept `FaceGraph`.