--- /dev/null
+#!/usr/bin/perl -w
+
+use strict;
+use Math::Trig;
+use Math::Vector::Real;
+use IO::File;
+use Data::Dumper;
+use constant tau => pi*2;
+
+print <<END;
+// -*- C -*-
+// *** AUTOGENERATED - DO NOT EDIT ***
+END
+
+my $ellipse = 20;
+my $circle = 6;
+my $xscale = 2;
+my $N = 30; # around ellipse
+my $M = 20; # around each circle
+
+our @ellipse = map {
+ my $theta = tau * $_ / $N;
+ V( cos($theta) * $ellipse * $xscale, sin($theta) * $ellipse, 0 )
+} 0..($N-1);
+
+#print Dumper(\@ellipse);
+
+our @alongs = map {
+ my $i = $_;
+ $ellipse[ ($i+1) % $N ] - $ellipse[ ($i-1) % $N];
+} 0..($N-1);
+
+our @circles = map {
+ my $i = $_;
+ my $centre = $ellipse[$i];
+ my $axis = $alongs[$i]->versor();
+ my $rad0 = $axis x V(0,0,1);
+ my $rad1 = $rad0 x $axis;
+ [ map {
+ my $theta = tau * $_ / $M;
+ $centre + $circle * ($rad0 * cos($theta) + $rad1 * sin($theta));
+ } 0..($M-1) ];
+} 0..($N-1);
+
+sub circle ($$$) { my ($c,$i,$j) = @_; $c->[ $i % $N ][ $j % $M ]; }
+
+sub torusy () {
+ print "module Torusy(){ polyhedron(points=[";
+ my $ptix = 0;
+ my @cirpt;
+ foreach my $i (0..$N-1) {
+ foreach my $j (0..$M-1) {
+ print "," if $ptix;
+ print "\n";
+ print " [ ", (join ", ", @{ $circles[$i][$j] }), " ]";
+ $cirpt[$i][$j] = $ptix++;
+ }
+ }
+ print "\n ],\n";
+
+ print " faces=[";
+ foreach my $i (0..$N-1) {
+ my $i2 = ($i+1) % $N;
+ foreach my $j (0..$M-1) {
+ my $j2 = ($j+1) % $M;
+ print "," if $i || $j;
+ print "\n";
+ print " [ ", (join ", ",
+ $cirpt[ $i ][ $j ],
+ $cirpt[ $i ][ $j2 ],
+ $cirpt[ $i2 ][ $j ],
+ ), " ],";
+ print " [ ", (join ", ",
+ $cirpt[ $i ][ $j2 ],
+ $cirpt[ $i2 ][ $j2 ],
+ $cirpt[ $i2 ][ $j ],
+ ), " ]";
+ }
+ }
+ print "\n ]);\n}\n";
+}
+
+torusy();
+
+while (<DATA>) { print };
+
+STDOUT->error and die $!;
+STDOUT->flush or die $!;
+
+__DATA__
+Torusy();