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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bidirectional reflectance distribution function ： ウィキペディア英語版 Bidirectional reflectance distribution function The bidirectional reflectance distribution function (BRDF; $f\_\},\backslash ,\; \backslash omega\_\}$, and outgoing direction, $\backslash omega\_\}$ to the irradiance incident on the surface from direction $\backslash omega\_\{\backslash text\{i\}\}$. Each direction $\backslash omega$ is itself parameterized by azimuth angle $\backslash phi$ and zenith angle $\backslash theta$, 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. ==Definition== The BRDF was first defined by Fred Nicodemus around 1965.〔 〕 The definition is: $f\_\},\backslash ,\; \backslash omega\_\}(\backslash omega\_\})\}\; \backslash ,=\backslash ,\; \backslash frac\})\}\})\backslash cos\backslash theta\_\}\}$ where $L$ is radiance, or power per unit solid angleApplied Optics | url = http://ao.osa.org/abstract.cfm?id=13818 | format = abstract | doi = 10.1364/AO.4.000767 | year = 1965 |bibcode = 1965ApOpt...4..767N }}〕 The definition is: $f\_\},\backslash ,\; \backslash omega\_\}(\backslash omega\_\})\}\; \backslash ,=\backslash ,\; \backslash frac\})\}\})\backslash cos\backslash theta\_\}\}$ where $L$ is radiance, or power per unit solid-angle-in-the-direction-of-a-ray per unit projected-area-perpendicular-to-the-ray, $E$ is irradiance, or power per unit ''surface area'', and $\backslash theta\_\}$ and the surface normal, $\backslash mathbf\; n$. The index $\backslash text$ indicates incident light, whereas the index $\backslash text$ indicates reflected light. The reason the function is defined as a quotient of two differentials and not directly as a quotient between the undifferentiated quantities, is because other irradiating light than $\backslash operatorname\; dE\_\})$, which are of no interest for $f\_\},\backslash ,\; \backslash omega\_\}(\backslash omega\_\}(\backslash omega\_\}(\backslash omega\_\{\backslash text\{i\}\})$. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bidirectional reflectance distribution function」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.