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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.
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Eugene d’Eon (2021) studied this question.
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