Snyder William C
Alphatech, Incorporated, Burlington, Massachusetts 01803, USA.
Appl Opt. 2002 Jul 20;41(21):4307-13. doi: 10.1364/ao.41.004307.
I address the question of whether the bidirectional reflectance distribution function (BRDF) of a structured surface has the same value when the incident and reflected angles are reversed. In particular, I examine the validity of some recent counterexamples and contrary measurements. On the basis of a new definition for structured surfaces, I conclude that the BRDF should be reciprocal. I show that designed counterexamples are flawed and suggest that measurements that do not exhibit reciprocity can be attributed to uncertainty and uncontrolled factors.
我探讨了一个问题，即当入射角和反射角互换时，结构化表面的双向反射分布函数（BRDF）是否具有相同的值。特别是，我研究了一些最近的反例和相反测量结果的有效性。基于对结构化表面的新定义，我得出结论，BRDF应该是互易的。我表明设计的反例存在缺陷，并指出未表现出互易性的测量结果可归因于不确定性和未控制的因素。
