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Determination of higher order propagation paths. In (a) the handling of multiple mirror operations of diffractions is depicted, in (b) higher order diffractions are applied and in (c) a reduced number of mirroring operations compared to (b) are applied due to the preserving of angles in Euclidean transforms. (d) depicts the determination of apex points and visibility aspects of image edges in three dimensional space. Analogous to the image source method, the mirrored apex point must lie behind the reflection plane.
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