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Definition
The Oren-Nayar reflectance model calculates the amount of reflected radiance at a surface point according to the lighting, viewing, and surface normal directions at that point. It is characterized by its high accuracy in modeling diffuse reflection for rough surfaces. It was introduced by Michael Oren and Shree K. Nayar [1] in 1994.
Background
When light arrives at surfaces, it can be reflected, refracted, scattered, or absorbed. Reflectance models are mathematical functions that describe the interactions between light and surfaces. Usually, they are functions of lighting, viewing, and surface normal directions. There are various reflectance models at different levels of precision and complexity. Most reflectance models include components describing diffuse and specular reflection, respectively.
The Oren-Nayar model is a reflectance model that accurately represents the diffuse reflection of rough surfaces. In the field of...
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References
. Oren M, Nayar SK (1994) Generalization of lambert's reflectance model. In: SIGGRAPH '94: proceedings of the 21st annual conference on computer graphics and interactive techniques. ACM, New York, pp 239–246
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Tan, P. (2014). Oren-Nayar Reflectance Model. In: Ikeuchi, K. (eds) Computer Vision. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-31439-6_535
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DOI: https://doi.org/10.1007/978-0-387-31439-6_535
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