About: Bidirectional reflectance distribution function

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The bidirectional reflectance distribution function (BRDF; ) 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 computer graphics algorithms, and in computer vision algorithms. The function takes an incoming light direction, , and outgoing direction, (taken in a coordinate system where the surface normal lies along the z-axis), and returns the ratio of reflected radiance exiting along to the irradiance incident on the surface from direction . Each direction is itself parameterized by azimuth angle and zenith angle , therefore the BRDF as a whole is a function of 4 variables. The BRDF has units sr−1, with steradians (sr) being a unit of solid angle.

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rdfs:label	Bidirectional reflectance distribution function (en)
rdfs:comment	The bidirectional reflectance distribution function (BRDF; ) 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 computer graphics algorithms, and in computer vision algorithms. The function takes an incoming light direction, , and outgoing direction, (taken in a coordinate system where the surface normal lies along the z-axis), and returns the ratio of reflected radiance exiting along to the irradiance incident on the surface from direction . Each direction is itself parameterized by azimuth angle and zenith angle , therefore the BRDF as a whole is a function of 4 variables. The BRDF has units sr−1, with steradians (sr) being a unit of solid angle. (en)
sameAs	Bidirectional reflectance distribution function Bidirectional reflectance distribution function
dbp:wikiPageUsesTemplate	dbt:Cite_book dbt:Cite_journal dbt:Multiple_image dbt:Short_description
Subject	3D rendering Astrophysics Radiometry Remote sensing Optics
Link from a Wikipage to an external page	http://scratchapixel.com/lessons/3d-basic-rendering/phong-shader-BRDF
thumbnail	wiki-commons:Special:FilePath/BRDF_Diagram.svg?width=300
foaf:depiction
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Bidirectional_reflectance_distribution_function?oldid=1052681830&ns=0
Wikipage page ID	1687038 (xsd:integer)
page length (characters) of wiki page	20434 (xsd:nonNegativeInteger)
Wikipage revision ID	1052681830 (xsd:integer)
Link from a Wikipage to another Wikipage	Normal (geometry) OPTOS formalism Projected area Albedo Anisotropy Azimuth Bidirectional scattering distribution function Bidirectional texture function Blinn–Phong reflection model Monte Carlo method Morgan Kaufmann Publishers Radiance Radiometry 3D rendering Astrophysics Radiometry Remote sensing Fresnel equations Glossary of computer graphics Optics Differential of a function Peter Shirley Power (physics) Zenith Linear optics Phenomenological model Phong reflection model Photometry (astronomy) Photovoltaic system Computer graphics Computer vision High dynamic range Milling (machining) Opacity (optics) Opposition surge Optics Oren–Nayar reflectance model Outline of object recognition Solar cell Arcsec Specular highlight Spherical coordinate system Gonioreflectometer Schlick's approximation Halftone Helmholtz reciprocity Inverse problem Iridescence Irradiance Lambertian reflectance Wavelength Steradian Subsurface scattering Luminescence Reflectance Rendering (computer graphics) Rendering equation
has abstract	The bidirectional reflectance distribution function (BRDF; ) 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 computer graphics algorithms, and in computer vision algorithms. The function takes an incoming light direction, , and outgoing direction, (taken in a coordinate system where the surface normal lies along the z-axis), and returns the ratio of reflected radiance exiting along to the irradiance incident on the surface from direction . Each direction is itself parameterized by azimuth angle and zenith angle , therefore the BRDF as a whole is a function of 4 variables. The BRDF has units sr−1, with steradians (sr) being a unit of solid angle. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Bidirectional_reflectance_distribution_function
is Wikipage redirect of	BRDF Bidirectional Reflectance Distribution Function BDRF Bidirectional Reflectance Distribution Functions Bidirectional reflectance function Brdf
is Link from a Wikipage to another Wikipage of	Albedo Anisotropy BRDF Bi-hemispherical reflectance Bidirectional Reflectance Distribution Function Bidirectional scattering distribution function Bidirectional texture function Blinn–Phong reflection model Geometric albedo

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