sub egg { # prints a 3d egg.
 my %args=(myprint => \&printout, xaxis => 10, ...);
 # Produces lines of wrl output in @lines ...
 $myprint=$args{myprint};
 &{$myprint}(\@lines);
}

##</code><code>##

my $Fh; # w/b set in mystart.
&mystart($LumberFile,LF);
sub mystart {
 my($file,$fh)=@_;
 open($fh,"> $file")
  || die("ERROR: Unable to open $file for output");
 $Fh=$fh;
 my @lines=split(/\n/,<<END);
#VRML V2.0 utf8
NavigationInfo { headlight TRUE }
...
END
 &myprint(\@lines);
}

sub myprint {
  my($lines)=@_;
  foreach my $line (@{$lines}) {
    print $Fh "$line\n";
  }
}