#!/usr/bin/perl

#

# Make an interactive preview of a luminaire

#

# This script is based on Radiance's objview.pl plus

# Rob Guglielmetti's ltview extension to his objview.rb

#

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

use strict;

use warnings;

use Math::Trig;

use File::Temp qw/ tempdir /;

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

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

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

my $box;                # Overall box dimensions

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

my $lumi   = "$td/lumi.rad";    # Fitting as given on cmd line, or generated by ies2rad

my $lumi2  = "$td/lumi2.rad";   # Fitting centred at origin

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

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

while (@ARGV) {

	$_ = $ARGV[0];

	if (m/-i/) {

		$is_ies = 1;

	} elsif (m/-o/) {   # output device (rvu -devices)

		$raddev = $ARGV[1];

		shift @ARGV;

	} elsif (m/-b/) {

		$box = $ARGV[1];    # Box dimensions

		shift @ARGV;

	} elsif (m/^-\w/) {

		die("ltview: Bad option: '$_'\n");

	} else {

		last;

	}

	shift @ARGV;

}

# We need exactly one Radiance luminaires or IES file

if (! $#ARGV == 0) {

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

} elsif ($is_ies == 0) {

	# Input file is a Radiance luminaire

	$lumi = $ARGV[0];

} else {

	# Input file is IES photometry

	system qq[ ies2rad -p $td -o lumi "$ARGV[0]" ];

}

# Work out centre of luminaire

my $dimstr = `getbbox -h "$lumi"`;

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 luminaire dimension

# The box will be ten times as large, unless overwritten with -b option.

my @diffs = reverse sort { $a <=> $b } ($dims[1]-$dims[0], $dims[3]-$dims[2], $dims[5]-$dims[4]);

my $lsize = $diffs[0];

# Centre fitting 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;

system qq[ xform -t $xtrans $ytrans $ztrans "$lumi" > $lumi2 ];

# Make the enclosing box

my $b2;

if (defined $box) {

	# Room dimensions are giving explicitly.

	$b2 = $box / 2;

} else {

	# Box dimensions are ten times largest luminaire bbox dimensions.

	$b2 = $lsize * 10.0 / 2.0;

}

open(FH, ">$room") or

		die("ltview: Can't write to temporary file '$room'\n");

print FH <<EndOfRoom;

void plastic wall_mat  0  0  5 .2 .2 .2 0 0

# Don't generate -y face so we can look into the box

#wall_mat polygon box.1540  0  0  12  $b2 -$b2 -$b2  $b2 -$b2 $b2  -$b2 -$b2 $b2  -$b2 -$b2 -$b2

wall_mat polygon box.4620  0  0  12  -$b2 -$b2 $b2  -$b2 $b2 $b2  -$b2 $b2 -$b2  -$b2 -$b2 -$b2

wall_mat polygon box.2310  0  0  12  -$b2 $b2 -$b2  $b2 $b2 -$b2  $b2 -$b2 -$b2  -$b2 -$b2 -$b2

wall_mat polygon box.3267  0  0  12  $b2 $b2 -$b2  -$b2 $b2 -$b2  -$b2 $b2 $b2  $b2 $b2 $b2

wall_mat polygon box.5137  0  0  12  $b2 -$b2 $b2  $b2 -$b2 -$b2  $b2 $b2 -$b2  $b2 $b2 $b2

wall_mat polygon box.6457  0  0  12  -$b2 $b2 $b2  -$b2 -$b2 $b2  $b2 -$b2 $b2  $b2 $b2 $b2

EndOfRoom

close(FH);

my $scene = "$room $lumi2";

# Make this work under Windoze

if ( $^O =~ /MSWin32/ ) {

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

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

	$raddev = "qt";

}

# Tweak scene 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 * $b2 * ( 1 + 1/tan(22.5*pi/180) );

open(FH, ">$rif") or

		die("ltview: Can't write to temporary file '$rif'\n");

print FH <<EndOfRif;

scene= $scene

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

UP= Z

view= y

OCTREE= $oct

oconv= -f

render= -av 0 0 0

INDIRECT= 0

QUALITY= Med

DETAIL= Low

VARIABILITY= Med

EndOfRif

close(FH);

exec "rad -o $raddev $rif";

#EOF