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The Oren–Nayar reflectance model, developed by Michael Oren and Shree K. Nayar, is a reflectivity model for diffuse reflection from rough surfaces. [1] It has been shown to accurately predict the appearance of a wide range of natural surfaces, such as concrete, plaster, sand, etc.
Diagram showing vectors used to define the BRDF. All vectors are unit length. points toward the light source. points toward the viewer (camera). is the surface normal.. The bidirectional reflectance distribution function (BRDF), symbol (,), is a function of four real variables that defines how light from a source is reflected off an opaque surface. It is employed in the optics of real-world ...
Shree K. Nayar is an engineer and computer scientist known for his contributions to the fields of computer vision, computational imaging, and computer graphics. He is the T. C. Chang Professor of Computer Science in the School of Engineering at Columbia University . [ 2 ]
Diffuse reflection is the reflection of light or other waves or particles from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of specular reflection.
OK, no book refs for "Oren-Nayar diffuse model", but plenty for "Oren-Nayar model", so I added a couple of those and removed the tag. I think the topic name with "diffuse model" is pretty lame, because the model is not diffuse, and this topic doesn't say it's about reflection, and serious writers don't call it that.
In Shafer's dichromatic reflection model, [1] ... Body essence is an entity invariant to interface reflection, and has two degrees of freedom. The Gaussian ...
1993 - Oren–Nayar reflectance model [121] 1993 - Tone mapping [122] 1993 - Subsurface scattering [123] 1993 - Bidirectional path tracing (Lafortune & Willems formulation) [124] 1994 - Ambient occlusion [125] 1995 - Photon mapping [126] 1995 - Multiple importance sampling [127] 1997 - Bidirectional path tracing (Veach & Guibas formulation) [128]
to generate a model of ten rays typically four rays more are added to the six rays model, these are (and bouncing on both sides of the wall); This incorporate paths from one to three reflections: specifically, there is the LOS (Line of sight), GR (ground reflected), SW (single-wall reflected), DW (double-wall reflected), TW (triple-wall ...