Since a Voronoi polyhedron is unbounded it must be artificially bounded for visualization purposes.
Allowed is any set of hyperplanes which makes the projection onto the last d-1 coordinates bounded.
By default, these are the vertical facets of a suitably scaled cube.
Not very useful for other unbounded polyhedra not related to Voronoi diagrams.
Graph of the Voronoi diagram of the SITES. The coordinates (homogeneous, before projection) are stored as node attributes.
The graph is truncated according to the VORONOI_BOUNDING_BOX. All vertices of the Voronoi diagram are visible (and represented in
the VORONOI_GRAPH) for the default VORONOI_BOUNDING_BOX.
Graph of the joint Voronoi diagram of the SITES and the vertices of Vor(SITES). The coordinates (homogeneous, before projection)
are stored as node attributes. The graph is truncated according to the VORONOI_BOUNDING_BOX. For the default VORONOI_BOUNDING_BOX it may happen
that some of the iterated Voronoi vertices are truncated. Use the client voronoi to produce proper iterated Voronoi diagrams.