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| {{expert|date=February 2012}}
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| In [[3D computer graphics]], '''Schlick's approximation''' is a formula for approximating the contribution of the [[Fresnel equation|Fresnel term]] in the [[specular reflection]] of light from a non-conducting interface (surface) between two media.
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| According to Schlick's model, the specular [[reflection coefficient]] ''R'' can be approximated by:
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| :<math>R(\theta) = R_0 + (1 - R_0)(1 - \cos \theta)^5</math>
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| :<math>R_0 = \left(\frac{n_1-n_2}{n_1+n_2}\right)^2</math> | |
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| where <math>\theta</math> is the angle between the viewing direction and the half-angle direction, which is halfway between the incident light direction and the viewing direction, hence <math>\cos\theta=(H\cdot V)</math>. And <math>n_1,\,n_2</math> are the indices of refraction of the two medias at the interface and <math>R_0</math> is the reflection coefficient for light incoming parallel to the normal (i.e., the value of the Fresnel term when <math>\theta = 0</math> or minimal reflection). In computer graphics, one of the interfaces is usually air, meaning that <math>n_1</math> very well can be approximated as 1.
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| ==See also==
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| {{portal|Computer graphics}}
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| * [[Phong reflection model]]
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| * [[Blinn-Phong shading model]]
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| * [[Fresnel equations]]
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| ==References==
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| * {{cite doi|10.1111/1467-8659.1330233}}
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| [[Category:3D computer graphics]]
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| {{compu-graphics-stub}}
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Latest revision as of 15:58, 28 August 2014
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