We present a new analytic BRDF for porous materials comprised of spherical Lambertian scatterers. The BRDF has a single parameter: the albedo of the Lambertian particles. The resulting appearance exhibits strong back scattering and saturation effects that height-field-based models such as Oren-Nayar cannot reproduce.

中文翻译：

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具有球形朗伯散射体的材料的解析 BRDF

我们提出了一种新的解析 BRDF，用于由球形朗伯散射体组成的多孔材料。BRDF 有一个参数：朗伯粒子的反照率。由此产生的外观表现出强烈的反向散射和饱和效应，这是 Oren-Nayar 等基于高度场的模型无法重现的。