-currently: working to address the instability of the Voronoi code relating to the radius of input sphere data (i.e., 2.0 works, 1.9999 doesn't; 87.0 doesn't, etc.)
-fixed a bug in filter_polygon_vertex_coordinates_for_extreme_proximity() -- projection back to surface was always performed with r = 1.0 instead of r = sphere_radius, which was a pretty severe bug
-still, with a large radius (i.e., 87.0) I'm getting math domain errors related to arc cosine of values outside of [-1,1]