--- a/bin/ltpict.pl	Tue Apr 08 22:55:23 2014 +0100
+++ b/bin/ltpict.pl	Tue Apr 08 22:56:02 2014 +0100
@@ -12,48 +12,44 @@
 
 use File::Temp qw/ tempdir /;
 my $td = tempdir( CLEANUP => 1 );
-use File::Copy qw(copy);
 
-my $res     = 1024;            # Default output image dimensions
+my $res     = 1024;            # Default output image dimensions. Same as objpict.
 my $tiny    = 0.01;
 my $maxsize = 0.001;           # max luminaire size after scaling
 my $is_ies  = 0;
 
-my $ies = "$td/dist.ies";
-my $lumi = "$td/lumi.rad";     # Fitting as given on cmd line, or as generated by ies2rad
+my $ies   = "$td/dist.ies";
+my $lumi  = "$td/lumi.rad";    # Fitting given on cmd line, or generated by ies2rad
 my $lumi2 = "$td/lumi2.rad";   # Fitting scaled to size
-my $mat = "$td/lt.mat";
+my $mat   = "$td/lt.mat";
 my $room1 = "$td/room1.rad";
 my $room2 = "$td/room2.rad";
 my $room3 = "$td/room3.rad";
 my $room4 = "$td/room4.rad";
-my $oct1 = "$td/lt1.oct";
-my $oct2 = "$td/lt2.oct";
-my $oct3 = "$td/lt3.oct";
-my $oct4 = "$td/lt4.oct";
+my $oct1  = "$td/lt1.oct";
+my $oct2  = "$td/lt2.oct";
+my $oct3  = "$td/lt3.oct";
+my $oct4  = "$td/lt4.oct";
 
 # Parse command line arguments
-while ($#ARGV >= 0) {
+while (@ARGV) {
 	$_ = $ARGV[0];
-	if (m/-i/) {         # File is an IES file, not Radiance luminaire
+	if (m/-i/) {         # File is an IES file, not a Radiance luminaire
 		$is_ies = 1;
 	} elsif (m/-d/) {    # Resolution of the output HDR image
 		$res = $ARGV[1];
 		shift @ARGV;
-
-    } elsif (m/^-/) { 	 # Oops! Illegal option
-        die("ltpict: bad option \"$ARGV[0]\"\n");
+    } elsif (m/^-\w/) { 	 # Oops! Illegal option
+        die("ltpict: bad option '$_'\n");
     } else {
 		last;    # No more options.  What's left is the actual file name.
 	}
     shift @ARGV;
 }
 
-# We need one Radiance luminaire or an IES file
 if ($is_ies == 0) {
 	# Input file is a Radiance luminaire
-	copy $ARGV[0], $lumi or
-			die("ltpict: Cannot copy file '$ARGV[0]' to $lumi\n");
+	$lumi = $ARGV[0];
 } else {
 	# Input file is IES photometry
 	system "ies2rad -p $td -o lumi $ARGV[0]";
@@ -93,34 +89,38 @@
 
 
 # Different 'room' geometry for different views
-my $offset = 0.1;
+my $o = 0.1;   # Offset
 
 # C0-C180
-open(FH, ">$room1") or die("ltpict: Cannot write to temporary file $room1");
-print FH "wall_mat polygon box.4620  0  0  12  -$offset -5 5  -$offset 5 5  -$offset 5 -5  -$offset -5 -5";
+open(FH, ">$room1") or
+		die("ltpict: Cannot write to temporary file $room1");
+print FH "wall_mat polygon box.4620  0  0  12  -$o -5 5  -$o 5 5  -$o 5 -5  -$o -5 -5";
 close(FH);
 
 # C90-C270
-open(FH, ">$room2") or die("ltpict: Cannot write to temporary file $room2");
-print FH "wall_mat polygon box.1540  0  0  12  5 $offset -5  5 $offset 5  -5 $offset 5  -5 $offset -5";
+open(FH, ">$room2") or
+		die("ltpict: Cannot write to temporary file $room2");
+print FH "wall_mat polygon box.1540  0  0  12  5 $o -5  5 $o 5  -5 $o 5  -5 $o -5";
 close(FH);
 
 # Lower hemisphere
-open(FH, ">$room3") or die("ltpict: Cannot write to temporary file $room3");
+open(FH, ">$room3") or 
+		die("ltpict: Cannot write to temporary file $room3");
 print FH "wall_mat bubble lower  0  0  4 0 0 $dims[4] 5";
 close(FH);
 
 # Upper hemisphere
-open(FH, ">$room4") or die("ltpict: Cannot write to temporary file $room4");
+open(FH, ">$room4") or 
+		die("ltpict: Cannot write to temporary file $room4");
 print FH "wall_mat bubble upper  0  0  4 0 0 $dims[5] 5";
 close(FH);
 
 
-# Get bbox again, for the translated and scaled luminaire.
+# Call bbox again, for the translated and scaled luminaire.
 $dimstr = `getbbox -h $lumi2`;
 chomp $dimstr;
 # Values returned by getbbox are indented and delimited with multiple spaces.
-$dimstr =~ s/^\s+//;   # remove leading spaces
+$dimstr =~ s/^\s+//;             # remove leading spaces
 @dims = split(/\s+/, $dimstr);   # convert to array
 
 # Define the four views