通过对五参数半经验双向反射分布函数（BRDF）模型进行修改，并吸收其它模型的优点，提出了一个六参数BRDF模型，该模型形式更简单，拟合效果更......

Reciprocity principle is a common theory in electromagnetics and optics. It is also one of the general principles of the......