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Optical properties (bidirectional reflectance distribution function) of shot fabric

机译：坯布的光学特性（双向反射率分布函数）

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摘要

To study the optical properties of materials, one needs a complete set of the angular distribution functions of surface scattering from the materials. Here we present a convenient method for collecting a large set of bidirectional reflectance distribution function (BRDF) samples in the hemispherical scattering space. Material samples are wrapped around a right-circular cylinder and irradiated by a parallel light source, and the scattered radiance is collected by a digital camera. We tilted the cylinder around its center to collect the BRDF samples outside the plane of incidence. This method can be used with materials that have isotropic and anisotropic scattering properties. We demonstrate this method in a detailed investigation of shot fabrics. The warps and the fillings of shot fabrics are dyed different colors so that the fabric appears to change color at different viewing angles. These color-changing characteristics are found to be related to the physical and geometrical structure of shot fabric. Our study reveals that the color-changing property of shot fabrics is due mainly to an occlusion effect.
机译：为了研究材料的光学特性，需要一种完整的材料表面散射角分布函数。在这里，我们提出了一种在半球形散射空间中收集大量双向反射分布函数（BRDF）样本的便捷方法。材料样本被包裹在一个直圆柱上并被平行光源照射，散射的辐射被数码相机收集。我们将圆柱体绕其中心倾斜，以将BRDF样本收集到入射平面之外。该方法可用于具有各向同性和各向异性散射特性的材料。我们在对弹射织物的详细调查中证明了这种方法。弹射织物的经纱和填充物被染成不同的颜色，因此织物在不同的视角下看起来会改变颜色。发现这些变色特性与粒料的物理和几何结构有关。我们的研究表明，弹射织物的变色特性主要是由于遮挡作用所致。

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