Spherical quadrature grid plotter. Takes a cloud of points on a sphere and plots its Voronoi tessellation.
x,y,z - column vectors containing Cartesian coordinates of grid points vorn - Voronoi tessellation; if this is not provided, it will be computed
this function plots a figure
Below is the Voronoi polyhedra diagram returned by grid_igloo(20).
Version 2.6, authors: Ilya Kuprov