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Functions
Geometric functions
GLM Core

## Functions

template<typename T , precision P>
GLM_FUNC_DECL tvec3< T, P > | cross (tvec3< T, P > const &x, tvec3< T, P > const &y)
template<typename T , precision P, template< typename, precision > class vecType>
GLM_FUNC_DECL T | distance (vecType< T, P > const &p0, vecType< T, P > const &p1)
template<typename T , precision P, template< typename, precision > class vecType>
GLM_FUNC_DECL T | dot (vecType< T, P > const &x, vecType< T, P > const &y)
template<typename T , precision P, template< typename, precision > class vecType>
GLM_FUNC_DECL vecType< T, P > | faceforward (vecType< T, P > const &N, vecType< T, P > const &I, vecType< T, P > const &Nref)
template<typename T , precision P, template< typename, precision > class vecType>
GLM_FUNC_DECL T | length (vecType< T, P > const &x)
template<typename T , precision P, template< typename, precision > class vecType>
GLM_FUNC_DECL vecType< T, P > | normalize (vecType< T, P > const &x)
template<typename genType >
GLM_FUNC_DECL genType | reflect (genType const &I, genType const &N)
template<typename T , precision P, template< typename, precision > class vecType>
GLM_FUNC_DECL vecType< T, P > | refract (vecType< T, P > const &I, vecType< T, P > const &N, T eta)

## Detailed Description

These operate on vectors as vectors, not component-wise.

## Function Documentation

GLM_FUNC_DECL tvec3<T, P> glm::cross | ( | tvec3< T, P > const & | x,
|  | tvec3< T, P > const & | y
| ) |  |

Returns the cross product of x and y.

Template Parameters

  valType | Floating-point scalar types.

See also
  GLSL cross man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL T glm::distance | ( | vecType< T, P > const & | p0,
|  | vecType< T, P > const & | p1
| ) |  |

Returns the distance betwwen p0 and p1, i.e., length(p0 - p1).

Template Parameters

  genType | Floating-point vector types.

See also
  GLSL distance man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL T glm::dot | ( | vecType< T, P > const & | x,
|  | vecType< T, P > const & | y
| ) |  |

Returns the dot product of x and y, i.e., result = x * y.

Template Parameters

  genType | Floating-point vector types.

See also
  GLSL dot man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL vecType<T, P> glm::faceforward | ( | vecType< T, P > const & | N,
|  | vecType< T, P > const & | I,
|  | vecType< T, P > const & | Nref
| ) |  |

If dot(Nref, I) < 0.0, return N, otherwise, return -N.

Template Parameters

  genType | Floating-point vector types.

See also
  GLSL faceforward man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL T glm::length | ( | vecType< T, P > const & | x | ) |

Returns the length of x, i.e., sqrt(x * x).

Template Parameters

  genType | Floating-point vector types.

See also
  GLSL length man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL vecType<T, P> glm::normalize | ( | vecType< T, P > const & | x | ) |

Returns a vector in the same direction as x but with length of 1.

According to issue 10 GLSL 1.10 specification, if length(x) == 0 then result is undefined and generate an error.

See also
  GLSL normalize man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL genType glm::reflect | ( | genType const & | I,
|  | genType const & | N
| ) |  |

For the incident vector I and surface orientation N, returns the reflection direction : result = I - 2.0 * dot(N, I) * N.

Template Parameters

  genType | Floating-point vector types.

See also
  GLSL reflect man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions

GLM_FUNC_DECL vecType<T, P> glm::refract | ( | vecType< T, P > const & | I,
|  | vecType< T, P > const & | N,
|  | T | eta
| ) |  |

For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector.

Template Parameters

  genType | Floating-point vector types.

See also
  GLSL refract man page
  GLSL 4.20.8 specification, section 8.5 Geometric Functions