Schlick's approximation: Difference between revisions

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In 3D computer graphics, Schlick's approximation is a formula for approximating the bidirectional reflectance distribution function (BRDF) of metallic surfaces. It was proposed by Christophe Schlick to approximate the contributions of Fresnel terms in the specular reflection of light from conducting surfaces.

According to Schlick's model, the specular reflection coefficient R is given by

R(\theta )=R_{0}+(1-R_{0})(1-\cos \theta )^{5}

where $\theta$ is half the angle between the incoming and outgoing light directions, and $R_{0}$ is the reflectance at normal incidence (i.e. the value of the Fresnel term when $\theta =0$ ).

References

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@@ Line 5: / Line 5: @@
 :<math>R(\theta) = R_0 + (1 - R_0)(1 - \cos \theta)^5</math>
-where <math>\theta</math> is the incident angle (which equals the reflected angle for specular reflection) and <math>R_0</math> is the reflectance at normal incidence (i.e. the value of the Fresnel term when <math>\theta = 0</math>).
+where <math>\theta</math> is half the angle between the incoming and outgoing light directions, and <math>R_0</math> is the reflectance at normal incidence (i.e. the value of the Fresnel term when <math>\theta = 0</math>).
 ==See also==