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#!/usr/bin/perl |
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|
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# Make a four-view picture of the photometry of a luminaire |
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# |
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# This is inspired by objpict.pl that renders four-view |
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# images of objects that are not light sources. |
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# |
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# Written by Axel Jacobs <[email protected]> |
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|
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use strict; |
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use warnings; |
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|
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use File::Temp qw/ tempdir /; |
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my $td = tempdir( CLEANUP => 1 ); |
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|
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my $res = 1024; # Default output image dimensions. Same as objpict. |
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my $tiny = 0.01; |
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my $maxsize = 0.001; # max luminaire size after scaling |
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my $is_ies = 0; |
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|
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my $ies = "$td/dist.ies"; |
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my $lumi = "$td/lumi.rad"; # Fitting given on cmd line, or generated by ies2rad |
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my $lumi2 = "$td/lumi2.rad"; # Fitting scaled to size |
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my $mat = "$td/lt.mat"; |
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my $room1 = "$td/room1.rad"; |
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my $room2 = "$td/room2.rad"; |
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my $room3 = "$td/room3.rad"; |
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my $room4 = "$td/room4.rad"; |
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my $oct1 = "$td/lt1.oct"; |
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my $oct2 = "$td/lt2.oct"; |
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my $oct3 = "$td/lt3.oct"; |
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my $oct4 = "$td/lt4.oct"; |
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|
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# Parse command line arguments |
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while (@ARGV) { |
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$_ = $ARGV[0]; |
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if (m/-i/) { # File is an IES file, not a Radiance luminaire |
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$is_ies = 1; |
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} elsif (m/-d/) { # Resolution of the output HDR image |
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$res = $ARGV[1]; |
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shift @ARGV; |
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} elsif (m/^-\w/) { # Oops! Illegal option |
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die("ltpict: bad option '$_'\n"); |
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} else { |
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last; # No more options. What's left is the actual file name. |
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} |
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shift @ARGV; |
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} |
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|
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if ($is_ies == 0) { |
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# Input file is a Radiance luminaire |
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$lumi = $ARGV[0]; |
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} else { |
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# Input file is IES photometry |
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system "ies2rad -p $td -o lumi $ARGV[0]"; |
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} |
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|
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my $res2 = $res / 2; # Each rendering is half the size of final composite |
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|
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# Scale luminaire and center at origin |
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my $dimstr = `getbbox -h $lumi`; |
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chomp $dimstr; |
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# Values returned by getbbox are indented and delimited with multiple spaces. |
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$dimstr =~ s/^\s+//; # remove leading spaces |
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my @dims = split(/\s+/, $dimstr); # convert to array |
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|
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# Find largest axes-aligned dimension |
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my @diffs = ($dims[1]-$dims[0], $dims[3]-$dims[2], $dims[5]-$dims[4]); |
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@diffs = reverse sort { $a <=> $b } @diffs; |
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my $size = $diffs[0]; |
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|
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# Move luminaire so centre is at origin, and scale |
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my $xtrans = -1.0 * ($dims[0] + $dims[1]) / 2; |
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my $ytrans = -1.0 * ($dims[2] + $dims[3]) / 2; |
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my $ztrans = -1.0 * ($dims[4] + $dims[5]) / 2; |
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my $scale = $maxsize / $size; |
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|
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open(FH, ">$lumi2") or |
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die("ltpict: Cannot write to temporary file $lumi"); |
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print FH "!xform -t $xtrans $ytrans $ztrans -s $scale $lumi"; |
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close FH; |
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|
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|
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# Material for the room |
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open(FH, ">$mat") or |
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die("ltpict: Cannot write to temporary file $mat"); |
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print FH "void plastic wall_mat 0 0 5 .5 .5 .5 0 0"; |
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close FH; |
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|
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|
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# Different 'room' geometry for different views |
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my $o = 0.1; # Offset |
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|
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# C0-C180 |
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open(FH, ">$room1") or |
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die("ltpict: Cannot write to temporary file $room1"); |
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print FH "wall_mat polygon box.4620 0 0 12 -$o -5 5 -$o 5 5 -$o 5 -5 -$o -5 -5"; |
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close(FH); |
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|
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# C90-C270 |
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open(FH, ">$room2") or |
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die("ltpict: Cannot write to temporary file $room2"); |
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print FH "wall_mat polygon box.1540 0 0 12 5 $o -5 5 $o 5 -5 $o 5 -5 $o -5"; |
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close(FH); |
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|
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# Lower hemisphere |
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open(FH, ">$room3") or |
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die("ltpict: Cannot write to temporary file $room3"); |
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print FH "wall_mat bubble lower 0 0 4 0 0 $dims[4] 5"; |
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close(FH); |
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|
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# Upper hemisphere |
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open(FH, ">$room4") or |
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die("ltpict: Cannot write to temporary file $room4"); |
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print FH "wall_mat bubble upper 0 0 4 0 0 $dims[5] 5"; |
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close(FH); |
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|
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|
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# Call bbox again, for the translated and scaled luminaire. |
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$dimstr = `getbbox -h $lumi2`; |
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chomp $dimstr; |
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# Values returned by getbbox are indented and delimited with multiple spaces. |
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$dimstr =~ s/^\s+//; # remove leading spaces |
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@dims = split(/\s+/, $dimstr); # convert to array |
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|
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# Define the four views |
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my $vw1 = "-vtl -vp 4.5 0 0 -vd -1 0 0 -vh 10 -vv 10"; |
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my $vw2 = "-vtl -vp 0 -4.5 0 -vd 0 1 0 -vh 10 -vv 10"; |
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my $zcent3 = $dims[4] - $tiny; |
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my $vw3 = "-vta -vp 0 0 $zcent3 -vd 0 0 -1 -vu 0 1 0 -vh 180 -vv 180"; |
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my $zcent4 = $dims[5] + $tiny; |
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my $vw4 = "-vta -vp 0 0 $zcent4 -vd 0 0 1 -vu 0 1 0 -vh 180 -vv 180"; |
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|
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system "oconv $mat $room1 $lumi2 > $oct1"; |
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system "oconv $mat $room2 $lumi2 > $oct2"; |
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system "oconv $mat $room3 $lumi2 > $oct3"; |
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system "oconv $mat $room4 $lumi2 > $oct4"; |
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|
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# Render four different views of the objects |
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my $rpict_cmd = "rpict -ab 0 -ds 0 -dv -av 0 0 0 -x $res2 -y $res2"; |
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system "$rpict_cmd $vw1 $oct1 > $td/right.hdr"; |
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system "$rpict_cmd $vw2 $oct2 > $td/front.hdr"; |
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system "$rpict_cmd $vw3 $oct3 > $td/down.hdr"; |
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system "$rpict_cmd $vw4 $oct4 > $td/up.hdr"; |
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|
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# Compose the four views into one image |
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my $vtl = "$td/vtl.hdr"; # The two parallel views |
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my $vta = "$td/vta.hdr"; # The two fisheye views |
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|
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# Auto-expose right/front and down/up pairs separately |
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my $pcond_cmd = "pcond -l"; |
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system "pcompos -a 2 $td/right.hdr $td/front.hdr > $td/rf.hdr"; |
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system "$pcond_cmd $td/rf.hdr > $vtl"; |
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system "pcompos -a 2 $td/down.hdr $td/up.hdr > $td/du.hdr"; |
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system "$pcond_cmd $td/du.hdr > $vta"; |
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|
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# Combine top two images with bottom row. Output HDR. |
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exec "pcompos -a 1 $vtl $vta"; |
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|
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#EOF |
