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[[EM.Terrano]] is a simulation software tool for modeling radio wave propagation in large scenes like urban canyons, indoor environments and natural terrain. Full-wave numerical methods like the finite difference time domain (FDTD) or the method of moments (MoM) solve differential or integral forms of Maxwell’s equations that require a fine discretization of the physical structure. To ensure the accuray of the simulation results, the resolution of the structure’s mesh must be high enough to accommodate a large number of cells per effective wavelength. Wireless propagation problems, on the other hand, typically involve scenes that may extend by hundreds or thousands of wavelengths. Generating a full-wave mesh in such sccenarios can easily lead to intractable computational problems demanding terabytes of computer memory. Asymptotic methods such as Shoot-and-Bounce-Rays (SBR) offer a practical solution for large-scale problems of this type. [[EM.Terrano]]’s simulation engine is based on the SBR method, which combines Geometrical Optics (GO) with the Uniform Theory of Diffraction (UTD).