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At execution
of smoothing procedure numbers of neighboring zones are not calculated
anew but d are calculated by addition to components translating the number
of the central zone into number of one of 27 adjacent zones (3x3x3). These
components are calculated beforehand. The logic of their evaluation is
defined by logic of an evaluation of common linear number of an element
(zone) in a multivariate (three-dimensional) array.

To reduce number
of contiguous segments tracing a reference contour at build-up of its
hypogram, the next reference hypogram points are under construction on
a forward branch of last contiguous segment. It is possible to tell, that
on this branch the fictitious tangential contiguous segment moves ahead,
and in its frame positions of the basis vector are registered. The boundary
of such construction is defined by mismatch of positions of the basis vector
in frames of actual and fictitious segments. Thus a movement step of actual
segments is continuously arranged with the help of feed-back so that to
keep the mismatch value within the limits of a zone quarter, and a step of
fictitious segments have to keep adjacent points of the reference hypogram
within the limits of one zone. The zone, as well as earlier, is meant as an
element of subdivision of parametrical space. If it is not possible to
be made, it is accepted, that in this place the hypogram has a rupture and
its construction proceeds from other place of the standard contour.