document: Three-dimensional geometrical optics code for indoor propagation This paper presents a program , GO 3D , for computing the fields of a transmitter in an indoor environment using geometrical optics . The program uses an `` image tree '' data structure to construct the images needed to compute all the rays carrying fields above a preset `` threshold '' value , no matter how many reflections are needed . The paper briefly describes the input file required to define wall construction , the floor plan , the transmitter , and the receiver locations . A case study consisting of a long corridor with a small room on one side is used to demonstrate the features of the GO 3D program
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