The image-source principle for computation of acoustics of a rectangular room was originally presented by Cremer in 1948 [1], and later by Mintzer in 1950 [2]. The first computerized version were presented by Gibbs and Jones in 1972 [3]. In 1979, Allen and Berkley published their version accompanied with FORTRAN code that implemented the algorithm [4]. A major step forward was taken in 1984, when Borish extended the approach to cover arbitrary polygonal structures [5], although the basic concepts were presented already in 1976 by Santon [6]. A thorough description and analysis of the image-source method has been presented by Mechel [7].
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