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GENERALISATION OF MUNJIZA-NBS CONTACT DETECTION ALGORITHM          125






                                                 z


                              y                        Central layer i z
                                                        Layer i − 1
                                                             z




                                         x
           Figure 3.60 A non-empty layer i z is detected, with all discrete elements mapped onto it being
           represented by a singly connected z-list z iz .













                                                        Central layer i z
                                                         Layer i − 1
                                                              z





                        Figure 3.61  Layers i z and i z − 1 are divided into rows of cells.





                                                 Central raw i y



                                                         Layer i z










                          Figure 3.62 A non-empty row of cells is detected (i y ,i z ).
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