This paper describes a technique for calculating the reflection of optical radiation from a rough three-dimensional object in the approximation of geometrical optics, using the Monte Carlo method. To allow for roughness, along with a macroscopic model of the object, a model is introduced at the microlevel, consisting of a substrate of finite size on which inhomogeneities are specified in the form of bodies bounded by second-order surfaces. The influence of edge effects on the microlevel model is investigated, and its optimal dimensions are selected. Results of the testing of the technique are presented, using experiments to determine the reflective properties of materials with a known degree of random roughness and of a three-dimensional object in the form of a biconical radiator.
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