tructure doesn't embed coordinates of the input
geometries.
Instead it links with those via source index and source category
methods
of the Voronoi cell primitive. Source index is incrementally given
(starting from zero) to each input site inserted into the <a
 href="voronoi_builder.htm">Voronoi
builder</a>.
Considering the fact, that each input segment is splitted onto three
separate sites with the same index, we distinguish between those using
source category. For more examples check the <a
 href="voronoi