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Chapter 11 introduces a bidirectional analytic ray tracing (BART) method. The basic idea is to launch ray tubes both from the source and observation, trace among the facets, and then record the illumination areas of rays shooting on facets and edges. For each pair of forward and backward rays illuminating the same facet/edge, a scattering path from source to observation is constructed by linking the forward and backward rays, and corresponding scattering contribution is added up to the total scattering. Numerical results are presented in the examples.