Bi-hemispherical reflectance is the

reflectance The reflectance of the surface of a material is its effectiveness in reflecting radiant energy. It is the fraction of incident electromagnetic power that is reflected at the boundary. Reflectance is a component of the response of the electronic ...

of a surface under diffuse illumination (with no direct component). Bi-hemispherical reflectance is an important part of the

Bidirectional reflectance distribution function The bidirectional reflectance distribution function (BRDF; f_(\omega_,\, \omega_) ) is a function of four real variables that defines how light is reflected at an opaque surface. It is employed in the optics of real-world light, in compute ...

over all viewing and illumination directions of a hemi

sphere A sphere () is a geometrical object that is a three-dimensional analogue to a two-dimensional circle. A sphere is the set of points that are all at the same distance from a given point in three-dimensional space.. That given point is th ...

. It is sometimes called "white-sky albedo".

References

Electromagnetic radiation {{Optics-stub

See also

References