custom_output.pl
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			#!/usr/bin/perl

			# Open the custom output from the custom_output.cc program
			open A,"packing.custom1" or die "Can't open file \"packing.custom1\"\n";

			# Open the POV-Ray file
			open B,">custom_output_p.pov" or die "Can't open output file\n";

			# Loop over all lines in the packing.custom1 file
			while(<A>) {

			# Use a regular expression to get the particle position and the number
			# of faces of the Voronoi cell. These will be stored in the variables
			# $1 and $2.
			m/pos=$(.)$.faces=(\d*)/;

			# Print a sphere to the POV-Ray file, giving it a different texture
			# depending on the number of faces of the Voronoi cell
			print B "sphere{<$1>,0.5 texture{t$2}}\n";
			}

			# Close the two files
			close A;
			close B;

lammps/lib/voro++/examples/custom/custom_output.pl706c4ccdaefdlammm-devel