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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 Schlick's approximation ： ウィキペディア英語版 Schlick's approximation In 3D computer graphics, Schlick's approximation, named after Christophe Schlick, is a formula for approximating the contribution of the Fresnel factor in the specular reflection of light from a non-conducting interface (surface) between two media. According to Schlick's model, the specular reflection coefficient ''R'' can be approximated by: :$R(\backslash theta)\; =\; R\_0\; +\; (1\; -\; R\_0)(1\; -\; \backslash cos\; \backslash theta)^5$ :$R\_0\; =\; \backslash left(\backslash frac\backslash right)^2$ where $\backslash theta$ is the angle between the direction from which the incident light is coming and the normal of the interface between the two media, hence $\backslash cos\backslash theta=(N\backslash cdot\; V)$. And $n\_1,\backslash ,n\_2$ are the indices of refraction of the two media at the interface and $R\_0$ is the reflection coefficient for light incoming parallel to the normal (i.e., the value of the Fresnel term when $\backslash theta\; =\; 0$ or minimal reflection). In computer graphics, one of the interfaces is usually air, meaning that $n\_1$ very well can be approximated as 1. In microfacet models it is assumed that there is always a perfect reflection, but the normal changes according to a certain distribution, resulting in a non-perfect overall reflection. When using Schlicks's approximation, the normal in the above computation is replaced by the halfway vector. Either the viewing or light direction can be used as the second vector. ==See also== * Phong reflection model * Blinn-Phong shading model * Fresnel equations 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「Schlick's approximation」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.