# Make an interactive preview of a luminaire

# Written by Axel Jacobs <axel@jaloxa.eu>

use Math::Trig;

use File::Copy;

my $td     = tempdir( CLEANUP => 1 );

my $oct    = "$td/ltview.oct";

my $room   = "$td/room.rad";

my $rdim;               # Overall room dimensions

my $rif    = "$td/ltview.rif";

my $lumi   = "$td/lumi.rad";

my $ies    = "$td/lumi.ies";

my $raddev = "x11";     # default output device. Overwrite with -o

my $is_ies = 0;         # input file is IES photometry, not a Radiance luminaire

my $maxscale = 1;       # Maximum luminiare dimension after scaling

my $opts     = "";      # Options common to rad and glrad

my $render   = "-ab 1 -ds .15 -av 0 0 0";    # render= line in rif file

my $radopt   = 0;       # An option specific to rad was passed (Boolean).

	if (m/-i/) {

		$is_ies = 1;

	} elsif (m/-r/) {

		$rdim = $ARGV[1];    # Room dimensions

		shift @ARGV;

# We need one Radiance luminaires description, or an IES file

	die("ltview: Need one Radiance luminaire or IES file.\n");

my $r;

if (defined $rdim) {

	# Room dimensions are giving explicitly.  Don't touch the fitting.

	$r = $rdim;

	copy ($ARGV[0], $lumi);

	# Scale fitting so it fits nicely into our default test room.

	$r = 5;    # Default room dimension

	# Work out how large the luminaire is and scale so that the longest

	# axis-align dimension is $maxscale

	my $dimstr = `getbbox -h $ARGV[0]`;

	chomp $dimstr;

	# Values returned by getbbox are indented and delimited with multiple spaces.

	$dimstr =~ s/^\s+//;   # remove leading spaces

	my @dims = split(/\s+/, $dimstr);   # convert to array

	# Find largest axes-aligned dimension

	my @diffs = ($dims[1]-$dims[0], $dims[3]-$dims[2], $dims[5]-$dims[4]);

	@diffs = reverse sort { $a <=> $b } @diffs;

	my $size = $diffs[0];

	# Move objects so centre is at origin

	my $xtrans = -1.0 * ($dims[0] + $dims[1]) / 2;

	my $ytrans = -1.0 * ($dims[2] + $dims[3]) / 2;

	my $ztrans = -1.0 * ($dims[4] + $dims[5]) / 2;

	# Scale so that largest object dimension is $maxscale

	my $scale = $maxscale / $size;

	system "xform -t $xtrans $ytrans $ztrans -s $scale $ARGV[0] > $lumi";

}

print FH <<EndOfRoom;

# Don't generate -y face so we can look into the box (could use clipping)

#wall_mat polygon box.1540  0  0  12  $r -$r -$r  $r -$r $r  -$r -$r $r  -$r -$r -$r

wall_mat polygon box.4620  0  0  12  -$r -$r $r  -$r $r $r  -$r $r -$r  -$r -$r -$r

wall_mat polygon box.2310  0  0  12  -$r $r -$r  $r $r -$r  $r -$r -$r  -$r -$r -$r

wall_mat polygon box.3267  0  0  12  $r $r -$r  -$r $r -$r  -$r $r $r  $r $r $r

wall_mat polygon box.5137  0  0  12  $r -$r $r  $r -$r -$r  $r $r -$r  $r $r $r

wall_mat polygon box.6457  0  0  12  -$r $r $r  -$r -$r $r  $r -$r $r  $r $r $r

EndOfRoom

close(FH);

	$oct =~ s{\\}{/}g;

# Tweak bounding box so we get a nice view covering all of the box, without

# having a wasteful black border around it.  Must work for arbitrary box dims.

my $zone = 1.1 * $r * ( 1 + 1/tan(22.5*pi/180) );

ZONE= Interior -$zone $zone  -$zone $zone  -$zone $zone

UP= Z

view= y

OCTREE= $oct

render= $render

system "rad -o $raddev $opts $rif";