n contain a point (e.g. cells Q, S,
T, U, V with corresponding input sources N, K, L, O, M respectively) or
a segment
(e.g. cells P and R with corresponding input sources MN and KL
respectively) as its
source. The Voronoi cell primitive doesn't contain coordinates of the
source geometry, instead it stores the index and category of the source
geometry. Source index corresponds to the unique id, issued to each
input geometry (e.g. incremental counter, used by the Voronoi builder).
Such an index uniquely ident