  This paper presents a new approach to computation of geometric continuity for
parametric bi-cubic patches, based on a simple mathematical reformulation which
leads to simple additional conditions to be applied in the patching
computation. The paper presents an Hermite formulation of a bicubic parametric
patch, but reformulations can be made also for B\'ezier and B-Spline patches as
well. The presented approach is convenient for the cases when valencies of
corners are different from the value 4, in general.
