# GLM: glm::core::function::geometric Namespace Reference

# glm::core::function::geometric Namespace Reference

Define all geometric functions from Section 8.4 of GLSL 1.30.8 specification. Included in glm namespace. More...

## Functions

template<typename valType >
detail::tvec3< valType > | cross (detail::tvec3< valType > const &x, detail::tvec3< valType > const &y)
| Returns the cross product of x and y.
template<typename genType >
genType::value_type | distance (genType const &p0, genType const &p1)
| Returns the distance betwwen p0 and p1, i.e., length(p0 - p1).
template<typename genType >
genType::value_type | dot (genType const &x, genType const &y)
| Returns the dot product of x and y, i.e., result = x * y.
template<typename genType >
genType | faceforward (genType const &N, genType const &I, genType const &Nref)
| If dot(Nref, I) < 0.0, return N, otherwise, return -N.
template<typename genType >
genType::value_type | length (genType const &x)
| Returns the length of x, i.e., sqrt(x * x).
template<typename genType >
genType | normalize (genType const &x)
| Returns a vector in the same direction as x but with length of 1.
template<typename genType >
genType | 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<typename genType >
genType | refract (genType const &I, genType const &N, typename genType::value_type const &eta)
| For the incident vector I and surface normal N, and the ratio of indices of refraction eta, return the refraction vector.

## Detailed Description

Define all geometric functions from Section 8.4 of GLSL 1.30.8 specification. Included in glm namespace.

## Function Documentation

detail::tvec3<valType> glm::core::function::geometric::cross | ( | detail::tvec3< valType > const & | x,
|  | detail::tvec3< valType > const & | y |
| ) |  |  |

Returns the cross product of x and y.

(From GLSL 1.30.08 specification, section 8.4)

genType::value_type glm::core::function::geometric::distance | ( | genType const & | p0,
|  | genType const & | p1 |
| ) |  |  |

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

(From GLSL 1.30.08 specification, section 8.4)

genType::value_type glm::core::function::geometric::dot | ( | genType const & | x,
|  | genType const & | y |
| ) |  |  |

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

(From GLSL 1.30.08 specification, section 8.4)

genType glm::core::function::geometric::faceforward | ( | genType const & | N,
|  | genType const & | I,
|  | genType const & | Nref |
| ) |  |  |

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

(From GLSL 1.30.08 specification, section 8.4)

genType::value_type glm::core::function::geometric::length | ( | genType const & | x | ) |

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

(From GLSL 1.30.08 specification, section 8.4)

genType glm::core::function::geometric::normalize | ( | genType const & | x | ) |

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

(From GLSL 1.30.08 specification, section 8.4)

genType glm::core::function::geometric::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.

(From GLSL 1.30.08 specification, section 8.4)

genType glm::core::function::geometric::refract | ( | genType const & | I,
|  | genType const & | N,
|  | typename genType::value_type const & | eta |
| ) |  |  |

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

(From GLSL 1.30.08 specification, section 8.4)