ph::math::detail Namespace Reference

Namespaces
namespace	bvh
namespace	shuffle

Classes
class	Pcg64UInt128
struct	TCIEXYZCmfKernel
class	TColorSpaceDummy
struct	TSmitsSPDBasis

Typedefs
template<typename ColorValuesType >
using	TColorValuesElementType = decltype(get_any_element_from_color_values(std::declval<ColorValuesType>()))

Functions
template<typename T >
auto	make_chromaticity_table () -> std::array< TChromaticityValues< T >, static_cast< std::size_t >(EReferenceWhite::NUM)>
template<typename ColorValuesType >
constexpr auto	get_any_element_from_color_values (const ColorValuesType &colorValues)
template<typename T >
TVector2< T >	octahedron_diamond_mirror (const TVector2< T > &point)

Typedef Documentation

TColorValuesElementType

template<typename ColorValuesType >

using ph::math::detail::TColorValuesElementType = decltype(get_any_element_from_color_values(std::declval<ColorValuesType>()))

Function Documentation

get_any_element_from_color_values()

template<typename ColorValuesType >

auto ph::math::detail::get_any_element_from_color_values ( const ColorValuesType & colorValues )

inlineconstexpr

make_chromaticity_table()

template<typename T >

auto ph::math::detail::make_chromaticity_table ( ) -> std::array<TChromaticityValues<T>, static_cast<std::size_t>(EReferenceWhite::NUM)>

inline

Values are for 2-degree standard observer.

References: [1] https://en.wikipedia.org/wiki/Standard_illuminant

The source code of Colour python library: [2] https://github.com/colour-science/colour/blob/v0.3.16/colour/colorimetry/datasets/illuminants/chromaticity_coordinates.py

Note

The values listed on Bruce's website (http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html) are for 10-degree standard observer. Those values can NOT be used here as we need 2-degree standard observer here.

octahedron_diamond_mirror()

template<typename T >

TVector2< T > ph::math::detail::octahedron_diamond_mirror ( const TVector2< T > & point )

inline

Consider an unwrapped octahedron (onto a square in [-1, 1]), with upper faces form a diamond shape in the middle, and the lower faces fill the remaining triangular areas. The function will map points in a triangle to the other triangle in the same quadrant, mirrored along their common edge.

[1] https://knarkowicz.wordpress.com/2014/04/16/octahedron-normal-vector-encoding/ [2] A Survey of Efficient Representations for Independent Unit Vectors https://jcgt.org/published/0003/02/01/paper.pdf (see supplemental materials for C++ reference implmentation)