The Bidirectional Reflectance Distribution Function (BRDF) provides a quantitative means of characterising how light is reflected from a surface. It is defined as the ratio of radiance scattered by ...

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In this paper, we consider the function f p ( t )= 2p X 2 ( 2p t+p;p ) , where χ²(x; n) defined by X 2 ( x;p )= 2 −p/2 Γ( p/2 ) e −x/2 x p/2−1 , is the density function of a χ²-distribution with n ...