Input/Output

This module offers convenience overloads of input/ouput functions available in the Point Set Processing package.

These overloads, available after including CGAL/Point_set_3/IO.h, allow the user to call point set processing algorithms without having to handle manually property maps and iterators.

Input functions instanciate all the necessary property maps:

• if found in the input, normal vectors are stored in the usual CGAL::Point_set_3 property normal with template type Vector
• for PLY and LAS input, other properties are stored as properties in the CGAL::Point_set_3 class with the name and type given by the PLY header or by the LAS standard.

For a complete documentation of these functions, please refer to the Point Set Processing Reference manual.

Modules
	Input/Output (LAS)
	I/O Functions for the LAS (Lidar) File Format.
	Input/Output (OFF)
	I/O Functions for the Object File Format (OFF).
	Input/Output (PLY)
	I/O Functions for the Polygon File Format (PLY).
	Input/Output (XYZ)
	I/O Functions for the XYZ File Format.
	Input/Output (Deprecated)
	These I/O functions are deprecated and newer versions should be used.

Functions
template<typename Point , typename Vector , typename NamedParameters >
bool	CGAL::IO::read_point_set (const std::string &fname, CGAL::Point_set_3< Point, Vector > &ps, const NamedParameters &np)
	reads the point set from an input file. More...
template<typename Point , typename Vector >
std::ostream &	CGAL::operator<< (std::ostream &os, const CGAL::Point_set_3< Point, Vector > &ps)
	writes the point set in an output stream in the Polygon File Format (PLY). More...
template<typename Point , typename Vector , typename NamedParameters >
bool	CGAL::IO::write_point_set (const std::string &fname, CGAL::Point_set_3< Point, Vector > &ps, const NamedParameters &np)
	writes the point set in an output file. More...
template<typename Point , typename Vector >
std::istream &	operator>> (std::istream &is, CGAL::Point_set_3< Point, Vector > &ps)
	reads the point set from an input stream. More...

Function Documentation

operator<<()

template<typename Point , typename Vector >

std::ostream& CGAL::operator<<	(	std::ostream &	os,
		const CGAL::Point_set_3< Point, Vector > &	ps
	)

#include <CGAL/Point_set_3/IO.h>

writes the point set in an output stream in the Polygon File Format (PLY).

All properties are inserted in their instantiation order.

Attention

To write to a binary file, the flag std::ios::binary must be set during the creation of the ofstream, and the IO::Mode of the stream must be set to BINARY.

Parameters

os	the output stream
ps	the point set

Returns

os

operator>>()

template<typename Point , typename Vector >

std::istream & operator>> ( std::istream &  is, CGAL::Point_set_3< Point, Vector > &  ps  )

related

reads the point set from an input stream.

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 stream. If the stream contains normal vectors, the normal map is added to the point set. For PLY input, all point properties found in the header are added.

Attention

To read a binary file, the flag std::ios::binary must be set during the creation of the ifstream.

Parameters

is	input stream
ps	point set

Returns

is

read_point_set()

template<typename Point , typename Vector , typename NamedParameters >

bool CGAL::IO::read_point_set	(	const std::string &	fname,
		CGAL::Point_set_3< Point, Vector > &	ps,
		const NamedParameters &	np
	)

#include <CGAL/Point_set_3/IO.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). If the file contains normal vectors, the normal map is added to the point set. For PLY input, all point properties found in the header are added.

Template Parameters

Point	the point type of the Point_set_3
Vector	the vector type of the Point_set_3
NamedParameters	a sequence of Named Parameters

Parameters

fname	name of the input file
ps	the point set
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

use_binary_mode 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 writing: the OFF and XYZ formats are always ASCII, and the LAS format is always binary.

Returns

true if the reading was successful, false otherwise.

Examples:

Point_set_3/draw_point_set_3.cpp.

write_point_set()

template<typename Point , typename Vector , typename NamedParameters >

bool CGAL::IO::write_point_set	(	const std::string &	fname,
		CGAL::Point_set_3< Point, Vector > &	ps,
		const NamedParameters &	np
	)

#include <CGAL/Point_set_3/IO.h>

writes the point set in an output 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

Point	the point type of the Point_set_3
Vector	the vector type of the Point_set_3
NamedParameters	a sequence of Named Parameters

Parameters

fname	name of the output file
ps	the point set
np	an optional sequence of Named Parameters among the ones listed below

Optional Named Parameters

use_binary_mode 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.
stream_precision 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 the writing was successful, false otherwise.