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Modeling Stray Light from Rough Surfaces and Subsurface Scatter

机译：模拟来自粗糙表面和次表面散射的杂散光

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Over the years we have developed an adequate theory and understanding of surface scatter from smooth optical surfaces (Rayleigh-Rice), moderately rough surfaces with paraxial incident and scattered angles (Beckmann-Kirchhoff) and even for moderately rough surfaces with arbitrary incident and scattered angles where a linear systems formulation requiring a two-parameter family of surface transfer functions is required to characterize the surface scatter process (generalized Harvey-Shack). However, there is always some new material or surface manufacturing process that provides non-intuitive scatter behavior. The linear systems formulation of surface scatter is potentially useful even for these situations. In this paper we will present empirical models of several classes of rough surfaces or materials (subsurface scatter) that allow us to accurately model the scattering behavior at any incident angle from limited measured scatter data. In particular, scattered radiance appears to continue being the natural quantity that exhibits simple, elegant behavior only in direction cosine space.
机译：多年以来，我们已经开发出了足够的理论，并了解了从光滑光学表面（Rayleigh-Rice），具有近轴入射角和散射角的中等粗糙表面（Beckmann-Kirchhoff）甚至对于具有任意入射角和散射角的中等粗糙表面的表面散射需要线性参数公式来表示表面散射过程的特征，该线性系统公式需要两参数系列的表面传递函数，以表征表面散射过程（广义的Harvey-Shack）。但是，总会有一些新材料或表面制造工艺提供非直观的散射行为。即使在这些情况下，表面散射的线性系统公式也可能有用。在本文中，我们将介绍几类粗糙表面或材料（次表面散射）的经验模型，这些模型使我们能够从有限的测量散射数据中准确地模拟在任何入射角下的散射行为。特别是，散射辐射似乎继续是仅在方向余弦空间中表现出简单，优雅行为的自然量。

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