CGAL 6.1 - 2D and 3D Linear Geometry Kernel

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Functions
CGAL::compare_dihedral_angle()
Reference Manual » Global Kernel Functions

##

## Functions
template<typename Kernel >
Comparison_result | CGAL::compare_dihedral_angle (const CGAL::Point_3< Kernel > &a1, const CGAL::Point_3< Kernel > &b1, const CGAL::Point_3< Kernel > &c1, const CGAL::Point_3< Kernel > &d1, const Kernel::FT &cosine)
| compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_1\) is the dihedral angle, in \( [0, \pi]\), of the tetrahedron `(a1, b1, c1, d1)` at the edge `(a1, b1)`, and \( \theta_2\) is the angle in \( [0, \pi]\) such that \( cos(\theta_2) = cosine\).
template<typename Kernel >
Comparison_result | CGAL::compare_dihedral_angle (const CGAL::Point_3< Kernel > &a1, const CGAL::Point_3< Kernel > &b1, const CGAL::Point_3< Kernel > &c1, const CGAL::Point_3< Kernel > &d1, const CGAL::Point_3< Kernel > &a2, const CGAL::Point_3< Kernel > &b2, const CGAL::Point_3< Kernel > &c2, const CGAL::Point_3< Kernel > &d2)
| compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_i\) is the dihedral angle in the tetrahedron `(a_i, b_i, c_i, d_i)` at the edge `(a_i, b_i)`.
template<typename Kernel >
Comparison_result | CGAL::compare_dihedral_angle (const CGAL::Vector_3< Kernel > &u1, const CGAL::Vector_3< Kernel > &v1, const CGAL::Vector_3< Kernel > &w1, const Kernel::FT &cosine)
| compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_1\) is the dihedral angle, in \( [0, \pi]\), between the vectorial planes defined by `(u_1, v_1)` and `(u_1, w_1)`, and \( \theta_2\) is the angle in \( [0, \pi]\) such that \( cos(\theta_2) = cosine\).
template<typename Kernel >
Comparison_result | CGAL::compare_dihedral_angle (const CGAL::Vector_3< Kernel > &u1, const CGAL::Vector_3< Kernel > &v1, const CGAL::Vector_3< Kernel > &w1, const CGAL::Vector_3< Kernel > &u2, const CGAL::Vector_3< Kernel > &v2, const CGAL::Vector_3< Kernel > &w2)
| compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_i\) is the dihedral angle between the vectorial planes defined by `(u_i, v_i)` and `(u_i, w_i)`.

## Function Documentation

## ◆ compare_dihedral_angle() [1/4]

template<typename Kernel >

Comparison_result CGAL::compare_dihedral_angle | ( | const CGAL::Point_3< Kernel > & | a1,
|  | const CGAL::Point_3< Kernel > & | b1,
|  | const CGAL::Point_3< Kernel > & | c1,
|  | const CGAL::Point_3< Kernel > & | d1,
|  | const CGAL::Point_3< Kernel > & | a2,
|  | const CGAL::Point_3< Kernel > & | b2,
|  | const CGAL::Point_3< Kernel > & | c2,
|  | const CGAL::Point_3< Kernel > & | d2
| ) |  |

`#include <CGAL/Kernel/global_functions.h>`

compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_i\) is the dihedral angle in the tetrahedron `(a_i, b_i, c_i, d_i)` at the edge `(a_i, b_i)`.

These two angles are computed in \( [0, \pi]\). The result is the same as `compare_dihedral_angle(b1-a1, c1-a1, d1-a1, b2-a2, c2-a2, d2-a2)`.

Precondition
  For \( i \in\{1,2\}\), `a_i`, `b_i`, `c_i` are not collinear, and `a_i`, `b_i`, `d_i` are not collinear.

## ◆ compare_dihedral_angle() [2/4]

template<typename Kernel >

Comparison_result CGAL::compare_dihedral_angle | ( | const CGAL::Point_3< Kernel > & | a1,
|  | const CGAL::Point_3< Kernel > & | b1,
|  | const CGAL::Point_3< Kernel > & | c1,
|  | const CGAL::Point_3< Kernel > & | d1,
|  | const Kernel::FT & | cosine
| ) |  |

`#include <CGAL/Kernel/global_functions.h>`

compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_1\) is the dihedral angle, in \( [0, \pi]\), of the tetrahedron `(a1, b1, c1, d1)` at the edge `(a1, b1)`, and \( \theta_2\) is the angle in \( [0, \pi]\) such that \( cos(\theta_2) = cosine\).

The result is the same as `compare_dihedral_angle(b1-a1, c1-a1, d1-a1, cosine)`.

Precondition
  `a1`, `b1`, `c1` are not collinear, and `a1`, `b1`, `d1` are not collinear.

## ◆ compare_dihedral_angle() [3/4]

template<typename Kernel >

Comparison_result CGAL::compare_dihedral_angle | ( | const CGAL::Vector_3< Kernel > & | u1,
|  | const CGAL::Vector_3< Kernel > & | v1,
|  | const CGAL::Vector_3< Kernel > & | w1,
|  | const CGAL::Vector_3< Kernel > & | u2,
|  | const CGAL::Vector_3< Kernel > & | v2,
|  | const CGAL::Vector_3< Kernel > & | w2
| ) |  |

`#include <CGAL/Kernel/global_functions.h>`

compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_i\) is the dihedral angle between the vectorial planes defined by `(u_i, v_i)` and `(u_i, w_i)`.

These two angles are computed in \( [0, \pi]\).

Precondition
  For \( i \in\{1,2\}\), `u_i` and `v_i` are not collinear, and `u_i` and `w_i` are not collinear.

## ◆ compare_dihedral_angle() [4/4]

template<typename Kernel >

Comparison_result CGAL::compare_dihedral_angle | ( | const CGAL::Vector_3< Kernel > & | u1,
|  | const CGAL::Vector_3< Kernel > & | v1,
|  | const CGAL::Vector_3< Kernel > & | w1,
|  | const Kernel::FT & | cosine
| ) |  |

`#include <CGAL/Kernel/global_functions.h>`

compares the dihedral angles \( \theta_1\) and \( \theta_2\), where \( \theta_1\) is the dihedral angle, in \( [0, \pi]\), between the vectorial planes defined by `(u_1, v_1)` and `(u_1, w_1)`, and \( \theta_2\) is the angle in \( [0, \pi]\) such that \( cos(\theta_2) = cosine\).

Precondition
  `u_1` and `v_1` are not collinear, and `u_1` and `w_1` are not collinear.