CGAL 6.1 - Point Set Processing

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Functions
I/O Functions
Reference Manual

##

## Functions
template<typename OutputIteratorValueType , typename PointOutputIterator , typename NamedParameters = parameters::Default_named_parameters>
bool | CGAL::IO::read_points (const std::string &fname, PointOutputIterator output, const NamedParameters &np=parameters::default_values())
| reads the point set from an input file.
template<typename PointRange , typename NamedParameters = CGAL::parameters::Default_named_parameters>
bool | CGAL::IO::write_points (const std::string &fname, const PointRange &points, const NamedParameters &np=parameters::default_values(),)
| writes the range of `points` with properties to a file.

## Function Documentation

## ◆ read_points()

template<typename OutputIteratorValueType , typename PointOutputIterator , typename NamedParameters = parameters::Default_named_parameters>

bool CGAL::IO::read_points | ( | const std::string & | fname,
|  | PointOutputIterator | output,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

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

reads the point set from an input file.

Supported file formats are the following:

- Object File Format (OFF) (`.off`)
- Polygon File Format (PLY) (`.ply`)
- LAS (Lidar) File Format (`.las`)
- XYZ File Format (`.xyz`)

The format is detected from the filename extension (letter case is not important).

Template Parameters

  OutputIteratorValueType | type of objects that can be put in `PointOutputIterator`. It must be a model of `DefaultConstructible` and defaults to `value_type_traits<PointOutputIterator>::type`. It can be omitted when the default is fine.
  PointOutputIterator | iterator over output points.
  NamedParameters | a sequence of Named Parameters

Parameters

  fname | the name of the input file.
  output | output iterator over points.
  np | optional sequence of Named Parameters among the ones listed below.

Optional Named Parameters

  a property map associating points to the elements of the point range Type: a model of `WritablePropertyMap` with value type `geom_traits::Point_3` Default: `CGAL::Identity_property_map<geom_traits::Point_3>` |
  a property map associating normals to the elements of the point range Type: a model of `WritablePropertyMap` with value type `geom_traits::Vector_3` Default: If this parameter is omitted, normals in the input stream are ignored. |
  an instance of a geometric traits class Type: a model of `Kernel` Default: a CGAL Kernel deduced from the point type, using `CGAL::Kernel_traits` |
  indicates whether data should be read in binary (`true`) or in ASCII (`false`) Type: Boolean Default: `true` Extra: This parameter is only relevant for `PLY` reading: the `OFF` and `XYZ` formats are always ASCII, and the `LAS` format is always binary. |

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

Examples
  Point_set_processing_3/average_spacing_example.cpp, Point_set_processing_3/bilateral_smooth_point_set_example.cpp, Point_set_processing_3/edge_aware_upsample_point_set_example.cpp, Point_set_processing_3/edges_example.cpp, Point_set_processing_3/grid_simplification_example.cpp, Point_set_processing_3/hierarchy_simplification_example.cpp, Point_set_processing_3/normals_example.cpp, Point_set_processing_3/poisson_eliminate_example.cpp, Point_set_processing_3/registration_with_OpenGR.cpp, Point_set_processing_3/registration_with_opengr_pointmatcher_pipeline.cpp, Point_set_processing_3/registration_with_pointmatcher.cpp, Point_set_processing_3/remove_outliers_example.cpp, Point_set_processing_3/scale_estimation_example.cpp, Point_set_processing_3/structuring_example.cpp, and Point_set_processing_3/wlop_simplify_and_regularize_point_set_example.cpp.

## ◆ write_points()

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

bool CGAL::IO::write_points | ( | const std::string & | fname,
|  | const PointRange & | points,
|  | const NamedParameters & | np = `parameters::default_values()`
| ) |  |

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

writes the range of `points` with properties to a file.

Supported file formats are the following:

- Object File Format (OFF) (`.off`)
- Polygon File Format (PLY) (`.ply`)
- LAS (Lidar) File Format (`.las`)
- XYZ File Format (`.xyz`)

The format is detected from the filename extension (letter case is not important).

Template Parameters

  PointRange | is a model of `ConstRange`. The value type of its iterator is the key type of the named parameter `point_map`.
  NamedParameters | a sequence of Named Parameters

Parameters

  fname | the name of the output file.
  points | the range of points that will be written.
  np | optional sequence of Named Parameters among the ones listed below.

Optional Named Parameters

  a property map associating points to the elements of the point range Type: a model of `ReadablePropertyMap` with value type `geom_traits::Point_3` Default: `CGAL::Identity_property_map<geom_traits::Point_3>` |
  a property map associating normals to the elements of the point range Type: a model of `ReadablePropertyMap` with value type `geom_traits::Vector_3` Default: If this parameter is omitted, normals are not written in the output file. |
  an instance of a geometric traits class Type: a model of `Kernel` Default: a CGAL Kernel deduced from the point type, using `CGAL::Kernel_traits` |
  indicates whether data should be written in binary (`true`) or in ASCII (`false`) Type: Boolean Default: `true` Extra: This parameter is only relevant for `PLY` writing: the `OFF` and `XYZ` formats are always ASCII, and the `LAS` format is always binary. |
  a parameter used to set the precision (i.e. how many digits are generated) of the output stream Type: int Default: `6` Extra: This parameter is only meaningful while using ASCII encoding. |

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

Examples
  Point_set_processing_3/edge_aware_upsample_point_set_example.cpp, Point_set_processing_3/hierarchy_simplification_example.cpp, Point_set_processing_3/poisson_eliminate_example.cpp, Point_set_processing_3/poisson_eliminate_from_mesh_example.cpp, Point_set_processing_3/registration_with_OpenGR.cpp, Point_set_processing_3/registration_with_opengr_pointmatcher_pipeline.cpp, Point_set_processing_3/registration_with_pointmatcher.cpp, Point_set_processing_3/structuring_example.cpp, and Point_set_processing_3/wlop_simplify_and_regularize_point_set_example.cpp.