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214:. This technique causes all closed polygons (such as a triangle within a 3D mesh) to reflect light equally in all directions when rendered. The reflection decreases when the surface is tilted away from being perpendicular to the light source, however, because the area is illuminated by a smaller fraction of the incident radiation.
536:), where the surface luminance is highest when the observer is situated at the perfect reflection direction (i.e. where the direction of the reflected light is a reflection of the direction of the incident light in the surface), and falls off sharply.
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is the angle between the directions of the two vectors, the brightness will be highest if the surface is perpendicular to the light vector, and lowest if the light vector intersects the surface at a grazing angle.
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in each direction. When viewed from various angles, the reflected radiant intensity and the apparent area of the surface both vary with the cosine of the viewing angle, so the reflected
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surface. The apparent brightness of a
Lambertian surface to an observer is the same regardless of the observer's angle of view. More precisely, the reflected
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While
Lambertian reflectance usually refers to the reflection of light by an object, it can be used to refer to the reflection of any wave. For example, in
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Unfinished wood exhibits roughly
Lambertian reflectance, but wood finished with a glossy coat of
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is a material which is designed to exhibit an almost perfect
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493:{\displaystyle \mathbf {L} \cdot \mathbf {N} =|N||L|\cos {\alpha }=\cos {\alpha }}
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Light
Scattering Technology for Food Property, Quality and Safety Assessment
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Lambertian reflection from polished surfaces is typically accompanied by
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Diagram of
Lambertian diffuse reflection. The black arrow shows incident
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Model for determining radiant energy reflected off diffuse surfaces
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the same in all directions. Lambertian reflectance is named after
328:{\displaystyle B_{D}=\mathbf {L} \cdot \mathbf {N} CI_{\text{L}}}
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Interactive
Computer Graphics: A Top-Down Approach Using OpenGL
548:, "rough" tissues are said to exhibit Lambertian reflectance.
143:(intensity per unit area) is the same from all viewing angles.
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Keelan, Robert; Shimada, Kenji; Rabin, Yoed (2016-06-23).
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Scattering, absorption and radiative transfer (optics)
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is the brightness of the diffusely reflected light,
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115:Learn how and when to remove this message
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53:adding citations to reliable sources
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558:List of common shading algorithms
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587:Encyclopedia of Computer Vision
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406:{\displaystyle I_{\text{L}}}
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202:Use in computer graphics
64:"Lambertian reflectance"
517:{\displaystyle \alpha }
168:Johann Heinrich Lambert
657:Angel, Edward (2003).
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21:Lambert's cosine law
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47:Please help
42:verification
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700:(1): 5–14.
540:Other waves
219:dot product
173:Photometria
757:Photometry
752:Radiometry
746:Categories
569:References
196:Spectralon
75:newspapers
19:See also:
714:1533-0346
634:CRC Press
512:α
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429:⋅
305:⋅
732:26818026
613:11390799
552:See also
180:Examples
164:radiance
141:radiance
133:radiance
105:May 2017
767:Shading
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89:scholar
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534:gloss
96:JSTOR
82:books
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710:ISSN
669:ISBN
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68:news
718:PMC
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480:cos
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206:In
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