I/O Functions

Functions
template<class Traits >
bool	read_OFF (std::istream &in, Polyhedron_3< Traits > &P)
	reads a polyhedral surface in Object File Format, OFF, with file extension .off, from the input stream in and appends it to the polyhedral surface \( P\).
template<class Traits >
std::istream &	operator>> (std::istream &in, Polyhedron_3< Traits > &P)
	calls read_OFF(in, P) .
template<class Traits >
bool	write_OFF (std::ostream &out, const Polyhedron_3< Traits > &P)
	writes the polyhedral surface \(P\) to the output stream out using the Object File Format, OFF, with file extension .off.
template<class Traits >
std::ostream &	operator<< (std::ostream &out, const Polyhedron_3< Traits > &P)
	calls write_OFF(out, P) .

Function Documentation

read_OFF()

template<class Traits >

bool read_OFF ( std::istream &  in, Polyhedron_3< Traits > &  P  )

related

reads a polyhedral surface in Object File Format, OFF, with file extension .off, from the input stream in and appends it to the polyhedral surface \( P\).

Only the point coordinates and facets from the input stream are used to build the polyhedral surface. Neither normal vectors nor color attributes are evaluated.

This function overloads the generic function read_OFF(std::istream&, FaceGraph) (if no named parameters are used).

Note

This function requires Traits to be a model of Kernel (a stronger requirement than PolyhedronTraits_3).

Implementation

This operator is implemented using the modifier mechanism for polyhedral surfaces and the Polyhedron_incremental_builder_3 class, which allows the construction in a single, efficient scan pass of the input and handles also all the possible flexibility of the polyhedral surface.

Note

Starting with CGAL 5.2, this function will no longer set the ios::badbit of the input stream in if the file contains 0 vertices.

See also

CGAL::Polyhedron_3<Traits>

CGAL::Polyhedron_incremental_builder_3<HDS>

operator<<(std::ostream&, Polyhedron_3<Traits>&)

write_OFF()

template<class Traits >

bool write_OFF ( std::ostream &  out, const Polyhedron_3< Traits > &  P  )

related

writes the polyhedral surface \(P\) to the output stream out using the Object File Format, OFF, with file extension .off.

The output is in ASCII format. From the polyhedral surface, only the point coordinates and facets are written. Neither normal vectors nor color attributes are used.

For OFF an ASCII and a binary format exist. The format can be selected with the CGAL modifiers for streams, set_ascii_mode() and set_binary_mode() respectively. The modifier set_pretty_mode() can be used to allow for (a few) structuring comments in the output. Otherwise, the output would be free of comments. The default for writing is ASCII without comments.

This function overloads the generic function write_OFF(std::istream&,FaceGraph) (if no named parameters are used).

See also

CGAL::Polyhedron_3<Traits>

CGAL::Polyhedron_incremental_builder_3<HDS>

operator>>(std::istream& in, Polyhedron_3<Traits>& P)