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In a computer-aided outdoor network design a huge amount of field strength calculations is required; therefore, development of an efficient calculation model is a challenge. In this paper, we present an efficient geometrical environment database preprocessing technique, which considerably accelerates ray tracing method for field strength prediction. This method greatly reduces the simulation time when applied to the shooting and bouncing ray approach and guarantees that all reflective surfaces and all diffractive edges are recognized. The method established by hybridization of concepts of inter-facet visibility distance and angular range of possible bouncing. It is observed that the proposed preprocessing technique is efficient enough for analysis of dense geometrical models. Special emphasis is placed on the discussion for evaluating the efficiency of presented preprocessing technique, including performance, and resources. The applicability of the fast ray-tracing technique based on proposed preprocessing, is demonstrated by comparison with measurement in an urban environment. Comparisons show that accurate predictions can be achieved.