T_Triangulation_extension_3_base< Triangulation3 >::Is_counter_clockwise_oriented Class Reference

Predicate checking that a facet of the 3D triangulation is counter-clockwise oriented. More...

#include <Triangulation_extension_3.hpp>

Functors
bool	operator() (Vertex_handle v_1, Vertex_handle v_2, Vertex_handle v_3, Vertex_handle v_4, const Triangulation3 &T) const
	Checks that a facet of the 3D triangulation is counter-clockwise oriented. More...

Detailed Description

template<class Triangulation3>
class SBL::GT::T_Triangulation_extension_3_base< Triangulation3 >::Is_counter_clockwise_oriented

Predicate checking that a facet of the 3D triangulation is counter-clockwise oriented.

Member Function Documentation

operator()()

bool operator() ( Vertex_handle  v_1, Vertex_handle  v_2, Vertex_handle  v_3, Vertex_handle  v_4, const Triangulation3 &  T  ) const

inline

Checks that a facet of the 3D triangulation is counter-clockwise oriented.

Note that the vertices of a cell of the 3D triangulation-complex are sorted such that all the cells have the same orientation: checking the order of vertices is sufficient for checking the orientation of a facet.

Precondition

the cell (v_1, v_2, v_3, v_4) exists