| 1 |
#!/usr/bin/perl -w |
| 2 |
# RCSid $Id: genBSDF.pl,v 2.33 2012/03/06 04:41:31 greg Exp $ |
| 3 |
# |
| 4 |
# Compute BSDF based on geometry and material description |
| 5 |
# |
| 6 |
# G. Ward |
| 7 |
# |
| 8 |
use strict; |
| 9 |
use File::Temp qw/ :mktemp /; |
| 10 |
sub userror { |
| 11 |
print STDERR "Usage: genBSDF [-n Nproc][-c Nsamp][-t{3|4} Nlog2][-r \"ropts\"][-dim xmin xmax ymin ymax zmin zmax][{+|-}f][{+|-}b][{+|-}mgf][{+|-}geom units] [input ..]\n"; |
| 12 |
exit 1; |
| 13 |
} |
| 14 |
my $td = mkdtemp("/tmp/genBSDF.XXXXXX"); |
| 15 |
chomp $td; |
| 16 |
my @savedARGV = @ARGV; |
| 17 |
my $tensortree = 0; |
| 18 |
my $ttlog2 = 4; |
| 19 |
my $nsamp = 2000; |
| 20 |
my $rtargs = "-w -ab 5 -ad 700 -lw 3e-6"; |
| 21 |
my $mgfin = 0; |
| 22 |
my $geout = 1; |
| 23 |
my $nproc = 1; |
| 24 |
my $doforw = 0; |
| 25 |
my $doback = 1; |
| 26 |
my $pctcull = 90; |
| 27 |
my $gunit = "Meter"; |
| 28 |
my @dim; |
| 29 |
# Get options |
| 30 |
while ($#ARGV >= 0) { |
| 31 |
if ("$ARGV[0]" =~ /^[-+]m/) { |
| 32 |
$mgfin = ("$ARGV[0]" =~ /^\+/); |
| 33 |
} elsif ("$ARGV[0]" eq "-r") { |
| 34 |
$rtargs = "$rtargs $ARGV[1]"; |
| 35 |
shift @ARGV; |
| 36 |
} elsif ("$ARGV[0]" =~ /^[-+]g/) { |
| 37 |
$geout = ("$ARGV[0]" =~ /^\+/); |
| 38 |
$gunit = $ARGV[1]; |
| 39 |
if ($gunit !~ /^(?i)(meter|foot|inch|centimeter|millimeter)$/) { |
| 40 |
die "Illegal geometry unit '$gunit': must be meter, foot, inch, centimeter, or millimeter\n"; |
| 41 |
} |
| 42 |
shift @ARGV; |
| 43 |
} elsif ("$ARGV[0]" =~ /^[-+]f/) { |
| 44 |
$doforw = ("$ARGV[0]" =~ /^\+/); |
| 45 |
} elsif ("$ARGV[0]" =~ /^[-+]b/) { |
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$doback = ("$ARGV[0]" =~ /^\+/); |
| 47 |
} elsif ("$ARGV[0]" eq "-t") { |
| 48 |
# Use value < 0 for rttree_reduce bypass |
| 49 |
$pctcull = $ARGV[1]; |
| 50 |
shift @ARGV; |
| 51 |
} elsif ("$ARGV[0]" =~ /^-t[34]$/) { |
| 52 |
$tensortree = substr($ARGV[0], 2, 1); |
| 53 |
$ttlog2 = $ARGV[1]; |
| 54 |
shift @ARGV; |
| 55 |
} elsif ("$ARGV[0]" eq "-c") { |
| 56 |
$nsamp = $ARGV[1]; |
| 57 |
shift @ARGV; |
| 58 |
} elsif ("$ARGV[0]" eq "-n") { |
| 59 |
$nproc = $ARGV[1]; |
| 60 |
shift @ARGV; |
| 61 |
} elsif ("$ARGV[0]" =~ /^-d/) { |
| 62 |
userror() if ($#ARGV < 6); |
| 63 |
@dim = @ARGV[1..6]; |
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shift @ARGV for (1..6); |
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} elsif ("$ARGV[0]" =~ /^[-+]./) { |
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userror(); |
| 67 |
} else { |
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last; |
| 69 |
} |
| 70 |
shift @ARGV; |
| 71 |
} |
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# Check that we're actually being asked to do something |
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die "Must have at least one of +forward or +backward\n" if (!$doforw && !$doback); |
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# Name our own persist file? |
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my $persistfile; |
| 76 |
if ( $tensortree && $nproc > 1 && "$rtargs" !~ /-PP /) { |
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$persistfile = "$td/pfile.txt"; |
| 78 |
$rtargs = "-PP $persistfile $rtargs"; |
| 79 |
} |
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# Get scene description and dimensions |
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my $radscn = "$td/device.rad"; |
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my $mgfscn = "$td/device.mgf"; |
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my $octree = "$td/device.oct"; |
| 84 |
if ( $mgfin ) { |
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system "mgfilt '#,o,xf,c,cxy,cspec,cmix,m,sides,rd,td,rs,ts,ir,v,p,n,f,fh,sph,cyl,cone,prism,ring,torus' @ARGV > $mgfscn"; |
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die "Could not load MGF input\n" if ( $? ); |
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system "mgf2rad $mgfscn > $radscn"; |
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} else { |
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system "xform -e @ARGV > $radscn"; |
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die "Could not load Radiance input\n" if ( $? ); |
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system "rad2mgf $radscn > $mgfscn" if ( $geout ); |
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} |
| 93 |
if ($#dim != 5) { |
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@dim = split ' ', `getbbox -h $radscn`; |
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} |
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print STDERR "Warning: Device extends into room\n" if ($dim[5] > 1e-5); |
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# Add receiver surfaces (rectangular) |
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my $fmodnm="receiver_face"; |
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my $bmodnm="receiver_behind"; |
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open(RADSCN, ">> $radscn"); |
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print RADSCN "void glow $fmodnm\n0\n0\n4 1 1 1 0\n\n"; |
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print RADSCN "$fmodnm source f_receiver\n0\n0\n4 0 0 1 180\n"; |
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print RADSCN "void glow $bmodnm\n0\n0\n4 1 1 1 0\n\n"; |
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print RADSCN "$bmodnm source b_receiver\n0\n0\n4 0 0 -1 180\n"; |
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close RADSCN; |
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# Generate octree |
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system "oconv -w $radscn > $octree"; |
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die "Could not compile scene\n" if ( $? ); |
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# Output XML prologue |
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print |
| 111 |
'<?xml version="1.0" encoding="UTF-8"?> |
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<WindowElement xmlns="http://windows.lbl.gov" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://windows.lbl.gov/BSDF-v1.4.xsd"> |
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'; |
| 114 |
print "<!-- File produced by: genBSDF @savedARGV -->\n"; |
| 115 |
print |
| 116 |
'<WindowElementType>System</WindowElementType> |
| 117 |
<Optical> |
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<Layer> |
| 119 |
<Material> |
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<Name>Name</Name> |
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<Manufacturer>Manufacturer</Manufacturer> |
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'; |
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printf "\t\t<Thickness unit=\"$gunit\">%.3f</Thickness>\n", $dim[5] - $dim[4]; |
| 124 |
printf "\t\t<Width unit=\"$gunit\">%.3f</Width>\n", $dim[1] - $dim[0]; |
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printf "\t\t<Height unit=\"$gunit\">%.3f</Height>\n", $dim[3] - $dim[2]; |
| 126 |
print "\t\t<DeviceType>Integral</DeviceType>\n"; |
| 127 |
# Output MGF description if requested |
| 128 |
if ( $geout ) { |
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print "\t\t<Geometry format=\"MGF\" unit=\"$gunit\">\n"; |
| 130 |
printf "xf -t %.6f %.6f 0\n", -($dim[0]+$dim[1])/2, -($dim[2]+$dim[3])/2; |
| 131 |
open(MGFSCN, "< $mgfscn"); |
| 132 |
while (<MGFSCN>) { print $_; } |
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close MGFSCN; |
| 134 |
print "xf\n"; |
| 135 |
print "\t\t</Geometry>\n"; |
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} |
| 137 |
print " </Material>\n"; |
| 138 |
# Set up surface sampling |
| 139 |
my $nx = int(sqrt($nsamp*($dim[1]-$dim[0])/($dim[3]-$dim[2])) + .5); |
| 140 |
my $ny = int($nsamp/$nx + .5); |
| 141 |
$nsamp = $nx * $ny; |
| 142 |
my $ns = 2**$ttlog2; |
| 143 |
my (@pdiv, $disk2sq, $sq2disk, $tcal, $kcal); |
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# Create data segments (all the work happens here) |
| 145 |
if ( $tensortree ) { |
| 146 |
do_tree_bsdf(); |
| 147 |
} else { |
| 148 |
do_matrix_bsdf(); |
| 149 |
} |
| 150 |
# Output XML epilogue |
| 151 |
print |
| 152 |
'</Layer> |
| 153 |
</Optical> |
| 154 |
</WindowElement> |
| 155 |
'; |
| 156 |
# Clean up temporary files and exit |
| 157 |
exec("rm -rf $td"); |
| 158 |
|
| 159 |
#-------------- End of main program segment --------------# |
| 160 |
|
| 161 |
#++++++++++++++ Kill persistent rtrace +++++++++++++++++++# |
| 162 |
sub persist_end { |
| 163 |
if ( $persistfile && open(PFI, "< $persistfile") ) { |
| 164 |
while (<PFI>) { |
| 165 |
s/^[^ ]* //; |
| 166 |
kill('ALRM', $_); |
| 167 |
last; |
| 168 |
} |
| 169 |
close PFI; |
| 170 |
} |
| 171 |
} |
| 172 |
|
| 173 |
#++++++++++++++ Tensor tree BSDF generation ++++++++++++++# |
| 174 |
sub do_tree_bsdf { |
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# Get sampling rate and subdivide task |
| 176 |
my $ns2 = $ns; |
| 177 |
$ns2 /= 2 if ( $tensortree == 3 ); |
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my $nsplice = $nproc; |
| 179 |
$nsplice *= 10 if ($nproc > 1); |
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$nsplice = $ns2 if ($nsplice > $ns2); |
| 181 |
$nsplice = 999 if ($nsplice > 999); |
| 182 |
@pdiv = (0, int($ns2/$nsplice)); |
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my $nrem = $ns2 % $nsplice; |
| 184 |
for (my $i = 1; $i < $nsplice; $i++) { |
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my $nv = $pdiv[$i] + $pdiv[1]; |
| 186 |
++$nv if ( $nrem-- > 0 ); |
| 187 |
push @pdiv, $nv; |
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} |
| 189 |
die "Script error 1" if ($pdiv[-1] != $ns2); |
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# Shirley-Chiu mapping from unit square to disk |
| 191 |
$sq2disk = ' |
| 192 |
in_square_a = 2*in_square_x - 1; |
| 193 |
in_square_b = 2*in_square_y - 1; |
| 194 |
in_square_rgn = if(in_square_a + in_square_b, |
| 195 |
if(in_square_a - in_square_b, 1, 2), |
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if(in_square_b - in_square_a, 3, 4)); |
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out_disk_r = .999995*select(in_square_rgn, in_square_a, in_square_b, |
| 198 |
-in_square_a, -in_square_b); |
| 199 |
out_disk_phi = PI/4 * select(in_square_rgn, |
| 200 |
in_square_b/in_square_a, |
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2 - in_square_a/in_square_b, |
| 202 |
4 + in_square_b/in_square_a, |
| 203 |
if(in_square_b*in_square_b, |
| 204 |
6 - in_square_a/in_square_b, 0)); |
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Dx = out_disk_r*cos(out_disk_phi); |
| 206 |
Dy = out_disk_r*sin(out_disk_phi); |
| 207 |
Dz = sqrt(1 - out_disk_r*out_disk_r); |
| 208 |
'; |
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# Shirley-Chiu mapping from unit disk to square |
| 210 |
$disk2sq = ' |
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norm_radians(p) : if(-p - PI/4, p + 2*PI, p); |
| 212 |
in_disk_r = .999995*sqrt(Dx*Dx + Dy*Dy); |
| 213 |
in_disk_phi = norm_radians(atan2(Dy, Dx)); |
| 214 |
in_disk_rgn = floor((in_disk_phi + PI/4)/(PI/2)) + 1; |
| 215 |
out_square_a = select(in_disk_rgn, |
| 216 |
in_disk_r, |
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(PI/2 - in_disk_phi)*in_disk_r/(PI/4), |
| 218 |
-in_disk_r, |
| 219 |
(in_disk_phi - 3*PI/2)*in_disk_r/(PI/4)); |
| 220 |
out_square_b = select(in_disk_rgn, |
| 221 |
in_disk_phi*in_disk_r/(PI/4), |
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in_disk_r, |
| 223 |
(PI - in_disk_phi)*in_disk_r/(PI/4), |
| 224 |
-in_disk_r); |
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out_square_x = (out_square_a + 1)/2; |
| 226 |
out_square_y = (out_square_b + 1)/2; |
| 227 |
'; |
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# Announce ourselves in XML output |
| 229 |
print "\t<DataDefinition>\n"; |
| 230 |
print "\t\t<IncidentDataStructure>TensorTree$tensortree</IncidentDataStructure>\n"; |
| 231 |
print "\t</DataDefinition>\n"; |
| 232 |
# Fork parallel rtcontrib processes to compute each side |
| 233 |
my $npleft = $nproc; |
| 234 |
if ( $doback ) { |
| 235 |
for (my $splice = 0; $splice < $nsplice; $splice++) { |
| 236 |
if (! $npleft ) { |
| 237 |
wait(); |
| 238 |
die "rtcontrib process reported error" if ( $? ); |
| 239 |
$npleft++; |
| 240 |
} |
| 241 |
bg_tree_rtcontrib(0, $splice); |
| 242 |
$npleft--; |
| 243 |
} |
| 244 |
while (wait() >= 0) { |
| 245 |
die "rtcontrib process reported error" if ( $? ); |
| 246 |
$npleft++; |
| 247 |
} |
| 248 |
persist_end(); |
| 249 |
ttree_out(0); |
| 250 |
} |
| 251 |
if ( $doforw ) { |
| 252 |
for (my $splice = 0; $splice < $nsplice; $splice++) { |
| 253 |
if (! $npleft ) { |
| 254 |
wait(); |
| 255 |
die "rtcontrib process reported error" if ( $? ); |
| 256 |
$npleft++; |
| 257 |
} |
| 258 |
bg_tree_rtcontrib(1, $splice); |
| 259 |
$npleft--; |
| 260 |
} |
| 261 |
while (wait() >= 0) { |
| 262 |
die "rtcontrib process reported error" if ( $? ); |
| 263 |
$npleft++; |
| 264 |
} |
| 265 |
persist_end(); |
| 266 |
ttree_out(1); |
| 267 |
} |
| 268 |
} # end of sub do_tree_bsdf() |
| 269 |
|
| 270 |
# Run rtcontrib process in background to generate tensor tree samples |
| 271 |
sub bg_tree_rtcontrib { |
| 272 |
my $pid = fork(); |
| 273 |
die "Cannot fork new process" unless defined $pid; |
| 274 |
if ($pid > 0) { return $pid; } |
| 275 |
my $forw = shift; |
| 276 |
my $pn = shift; |
| 277 |
my $pbeg = $pdiv[$pn]; |
| 278 |
my $plen = $pdiv[$pn+1] - $pbeg; |
| 279 |
my $matargs = "-m $bmodnm"; |
| 280 |
if ( !$forw || !$doback ) { $matargs .= " -m $fmodnm"; } |
| 281 |
my $cmd = "rtcontrib $rtargs -h -ff -fo -c $nsamp " . |
| 282 |
"-e '$disk2sq' -bn '$ns*$ns' " . |
| 283 |
"-b '$ns*floor(out_square_x*$ns)+floor(out_square_y*$ns)' " . |
| 284 |
"-o $td/%s_" . sprintf("%03d", $pn) . ".flt $matargs $octree"; |
| 285 |
if ( $tensortree == 3 ) { |
| 286 |
# Isotropic BSDF |
| 287 |
$cmd = "cnt $plen $ny $nx " . |
| 288 |
"| rcalc -e 'r1=rand(($pn+.8681)*recno-.673892)' " . |
| 289 |
"-e 'r2=rand(($pn-5.37138)*recno+67.1737811)' " . |
| 290 |
"-e 'r3=rand(($pn+3.17603772)*recno+83.766771)' " . |
| 291 |
"-e 'Dx=1-2*($pbeg+\$1+r1)/$ns;Dy:0;Dz=sqrt(1-Dx*Dx)' " . |
| 292 |
"-e 'xp=(\$3+r2)*(($dim[1]-$dim[0])/$nx)+$dim[0]' " . |
| 293 |
"-e 'yp=(\$2+r3)*(($dim[3]-$dim[2])/$ny)+$dim[2]' " . |
| 294 |
"-e 'zp=$dim[5-$forw]' -e 'myDz=Dz*($forw*2-1)' " . |
| 295 |
"-e '\$1=xp-Dx;\$2=yp-Dy;\$3=zp-myDz' " . |
| 296 |
"-e '\$4=Dx;\$5=Dy;\$6=myDz' -of " . |
| 297 |
"| $cmd"; |
| 298 |
} else { |
| 299 |
# Anisotropic BSDF |
| 300 |
# Sample area vertically to improve load balance, since |
| 301 |
# shading systems usually have bilateral symmetry (L-R) |
| 302 |
$cmd = "cnt $plen $ns $ny $nx " . |
| 303 |
"| rcalc -e 'r1=rand(($pn+.8681)*recno-.673892)' " . |
| 304 |
"-e 'r2=rand(($pn-5.37138)*recno+67.1737811)' " . |
| 305 |
"-e 'r3=rand(($pn+3.17603772)*recno+83.766771)' " . |
| 306 |
"-e 'r4=rand(($pn-2.3857833)*recno-964.72738)' " . |
| 307 |
"-e 'in_square_x=($pbeg+\$1+r1)/$ns' " . |
| 308 |
"-e 'in_square_y=(\$2+r2)/$ns' -e '$sq2disk' " . |
| 309 |
"-e 'xp=(\$4+r3)*(($dim[1]-$dim[0])/$nx)+$dim[0]' " . |
| 310 |
"-e 'yp=(\$3+r4)*(($dim[3]-$dim[2])/$ny)+$dim[2]' " . |
| 311 |
"-e 'zp=$dim[5-$forw]' -e 'myDz=Dz*($forw*2-1)' " . |
| 312 |
"-e '\$1=xp-Dx;\$2=yp-Dy;\$3=zp-myDz' " . |
| 313 |
"-e '\$4=Dx;\$5=Dy;\$6=myDz' -of " . |
| 314 |
"| $cmd"; |
| 315 |
} |
| 316 |
# print STDERR "Starting: $cmd\n"; |
| 317 |
exec($cmd); # no return; status report to parent via wait |
| 318 |
die "Cannot exec: $cmd\n"; |
| 319 |
} # end of bg_tree_rtcontrib() |
| 320 |
|
| 321 |
# Simplify and output tensor tree results |
| 322 |
sub ttree_out { |
| 323 |
my $forw = shift; |
| 324 |
my $side = ("Back","Front")[$forw]; |
| 325 |
my $cmd; |
| 326 |
# Only output one transmitted distribution, preferring backwards |
| 327 |
if ( !$forw || !$doback ) { |
| 328 |
print |
| 329 |
' <WavelengthData> |
| 330 |
<LayerNumber>System</LayerNumber> |
| 331 |
<Wavelength unit="Integral">Visible</Wavelength> |
| 332 |
<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
| 333 |
<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
| 334 |
<WavelengthDataBlock> |
| 335 |
<WavelengthDataDirection>Transmission</WavelengthDataDirection> |
| 336 |
<AngleBasis>LBNL/Shirley-Chiu</AngleBasis> |
| 337 |
<ScatteringDataType>BTDF</ScatteringDataType> |
| 338 |
<ScatteringData> |
| 339 |
'; |
| 340 |
$cmd = "rcalc -if3 -e 'Omega:PI/($ns*$ns)' " . |
| 341 |
q{-e '$1=(0.265*$1+0.670*$2+0.065*$3)/Omega' }; |
| 342 |
if ($pctcull >= 0) { |
| 343 |
$cmd .= "-of $td/" . ($bmodnm,$fmodnm)[$forw] . "_???.flt " . |
| 344 |
"| rttree_reduce -a -h -ff -t $pctcull -r $tensortree -g $ttlog2"; |
| 345 |
system "$cmd" || die "Failure running rttree_reduce"; |
| 346 |
} else { |
| 347 |
$cmd .= "$td/" . ($bmodnm,$fmodnm)[$forw] . "_???.flt"; |
| 348 |
print "{\n"; |
| 349 |
system "$cmd" || die "Failure running rcalc"; |
| 350 |
for (my $i = ($tensortree==3)*$ns*$ns*$ns/2; $i-- > 0; ) { |
| 351 |
print "0\n"; |
| 352 |
} |
| 353 |
print "}\n"; |
| 354 |
} |
| 355 |
print |
| 356 |
' </ScatteringData> |
| 357 |
</WavelengthDataBlock> |
| 358 |
</WavelengthData> |
| 359 |
'; |
| 360 |
} |
| 361 |
# Output reflection |
| 362 |
print |
| 363 |
' <WavelengthData> |
| 364 |
<LayerNumber>System</LayerNumber> |
| 365 |
<Wavelength unit="Integral">Visible</Wavelength> |
| 366 |
<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
| 367 |
<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
| 368 |
<WavelengthDataBlock> |
| 369 |
'; |
| 370 |
print "\t\t\t<WavelengthDataDirection>Reflection $side</WavelengthDataDirection>\n"; |
| 371 |
print |
| 372 |
' <AngleBasis>LBNL/Shirley-Chiu</AngleBasis> |
| 373 |
<ScatteringDataType>BRDF</ScatteringDataType> |
| 374 |
<ScatteringData> |
| 375 |
'; |
| 376 |
$cmd = "rcalc -if3 -e 'Omega:PI/($ns*$ns)' " . |
| 377 |
q{-e '$1=(0.265*$1+0.670*$2+0.065*$3)/Omega' }; |
| 378 |
if ($pctcull >= 0) { |
| 379 |
$cmd .= "-of $td/" . ($fmodnm,$bmodnm)[$forw] . "_???.flt " . |
| 380 |
"| rttree_reduce -a -h -ff -t $pctcull -r $tensortree -g $ttlog2"; |
| 381 |
system "$cmd" || die "Failure running rttree_reduce"; |
| 382 |
} else { |
| 383 |
$cmd .= "$td/" . ($fmodnm,$bmodnm)[$forw] . "_???.flt"; |
| 384 |
print "{\n"; |
| 385 |
system "$cmd" || die "Failure running rcalc"; |
| 386 |
for (my $i = ($tensortree==3)*$ns*$ns*$ns/2; $i-- > 0; ) { |
| 387 |
print "0\n"; |
| 388 |
} |
| 389 |
print "}\n"; |
| 390 |
} |
| 391 |
print |
| 392 |
' </ScatteringData> |
| 393 |
</WavelengthDataBlock> |
| 394 |
</WavelengthData> |
| 395 |
'; |
| 396 |
} # end of ttree_out() |
| 397 |
|
| 398 |
#------------- End of do_tree_bsdf() & subroutines -------------# |
| 399 |
|
| 400 |
#+++++++++++++++ Klems matrix BSDF generation +++++++++++++++# |
| 401 |
sub do_matrix_bsdf { |
| 402 |
# Set up sampling of portal |
| 403 |
# Kbin to produce incident direction in full Klems basis with (x1,x2) randoms |
| 404 |
$tcal = ' |
| 405 |
DEGREE : PI/180; |
| 406 |
sq(x) : x*x; |
| 407 |
Kpola(r) : select(r+1, -5, 5, 15, 25, 35, 45, 55, 65, 75, 90); |
| 408 |
Knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12); |
| 409 |
Kaccum(r) : if(r-.5, Knaz(r) + Kaccum(r-1), 0); |
| 410 |
Kmax : Kaccum(Knaz(0)); |
| 411 |
Kfindrow(r, rem) : if(rem-Knaz(r)+.5, Kfindrow(r+1, rem-Knaz(r)), r); |
| 412 |
Krow = if(Kbin-(Kmax-.5), 0, Kfindrow(1, Kbin)); |
| 413 |
Kcol = Kbin - Kaccum(Krow-1); |
| 414 |
Kazi = 360*DEGREE * (Kcol + (.5 - x2)) / Knaz(Krow); |
| 415 |
Kpol = DEGREE * (x1*Kpola(Krow) + (1-x1)*Kpola(Krow-1)); |
| 416 |
sin_kpol = sin(Kpol); |
| 417 |
Dx = cos(Kazi)*sin_kpol; |
| 418 |
Dy = sin(Kazi)*sin_kpol; |
| 419 |
Dz = sqrt(1 - sin_kpol*sin_kpol); |
| 420 |
KprojOmega = PI * if(Kbin-.5, |
| 421 |
(sq(cos(Kpola(Krow-1)*DEGREE)) - sq(cos(Kpola(Krow)*DEGREE)))/Knaz(Krow), |
| 422 |
1 - sq(cos(Kpola(1)*DEGREE))); |
| 423 |
'; |
| 424 |
# Compute Klems bin from exiting ray direction (forward or backward) |
| 425 |
$kcal = ' |
| 426 |
DEGREE : PI/180; |
| 427 |
abs(x) : if(x, x, -x); |
| 428 |
Acos(x) : if(x-1, 0, if(-1-x, PI, acos(x))) / DEGREE; |
| 429 |
posangle(a) : if(-a, a + 2*PI, a); |
| 430 |
Atan2(y,x) : posangle(atan2(y,x)) / DEGREE; |
| 431 |
kpola(r) : select(r, 5, 15, 25, 35, 45, 55, 65, 75, 90); |
| 432 |
knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12); |
| 433 |
kaccum(r) : if(r-.5, knaz(r) + kaccum(r-1), 0); |
| 434 |
kfindrow(r, pol) : if(r-kpola(0)+.5, r, |
| 435 |
if(pol-kpola(r), kfindrow(r+1, pol), r) ); |
| 436 |
kazn(azi,inc) : if((360-.5*inc)-azi, floor((azi+.5*inc)/inc), 0); |
| 437 |
kbin2(pol,azi) = select(kfindrow(1, pol), |
| 438 |
kazn(azi,360/knaz(1)), |
| 439 |
kaccum(1) + kazn(azi,360/knaz(2)), |
| 440 |
kaccum(2) + kazn(azi,360/knaz(3)), |
| 441 |
kaccum(3) + kazn(azi,360/knaz(4)), |
| 442 |
kaccum(4) + kazn(azi,360/knaz(5)), |
| 443 |
kaccum(5) + kazn(azi,360/knaz(6)), |
| 444 |
kaccum(6) + kazn(azi,360/knaz(7)), |
| 445 |
kaccum(7) + kazn(azi,360/knaz(8)), |
| 446 |
kaccum(8) + kazn(azi,360/knaz(9)) |
| 447 |
); |
| 448 |
kbin = kbin2(Acos(abs(Dz)),Atan2(Dy,Dx)); |
| 449 |
'; |
| 450 |
my $ndiv = 145; |
| 451 |
# Compute scattering data using rtcontrib |
| 452 |
my @tfarr; |
| 453 |
my @rfarr; |
| 454 |
my @tbarr; |
| 455 |
my @rbarr; |
| 456 |
my $cmd; |
| 457 |
my $rtcmd = "rtcontrib $rtargs -h -ff -fo -n $nproc -c $nsamp " . |
| 458 |
"-e '$kcal' -b kbin -bn $ndiv " . |
| 459 |
"-o '$td/%s.flt' -m $fmodnm -m $bmodnm $octree"; |
| 460 |
my $rccmd = "rcalc -e '$tcal' " . |
| 461 |
"-e 'mod(n,d):n-floor(n/d)*d' -e 'Kbin=mod(recno-.999,$ndiv)' " . |
| 462 |
q{-if3 -e '$1=(0.265*$1+0.670*$2+0.065*$3)/KprojOmega' }; |
| 463 |
if ( $doforw ) { |
| 464 |
$cmd = "cnt $ndiv $ny $nx | rcalc -of -e '$tcal' " . |
| 465 |
"-e 'xp=(\$3+rand(.12*recno+288))*(($dim[1]-$dim[0])/$nx)+$dim[0]' " . |
| 466 |
"-e 'yp=(\$2+rand(.37*recno-44))*(($dim[3]-$dim[2])/$ny)+$dim[2]' " . |
| 467 |
"-e 'zp:$dim[4]' " . |
| 468 |
q{-e 'Kbin=$1;x1=rand(2.75*recno+3.1);x2=rand(-2.01*recno-3.37)' } . |
| 469 |
q{-e '$1=xp-Dx;$2=yp-Dy;$3=zp-Dz;$4=Dx;$5=Dy;$6=Dz' } . |
| 470 |
"| $rtcmd"; |
| 471 |
system "$cmd" || die "Failure running: $cmd\n"; |
| 472 |
@tfarr = `$rccmd $td/$fmodnm.flt`; |
| 473 |
die "Failure running: $rccmd $td/$fmodnm.flt\n" if ( $? ); |
| 474 |
@rfarr = `$rccmd $td/$bmodnm.flt`; |
| 475 |
die "Failure running: $rccmd $td/$bmodnm.flt\n" if ( $? ); |
| 476 |
} |
| 477 |
if ( $doback ) { |
| 478 |
$cmd = "cnt $ndiv $ny $nx | rcalc -of -e '$tcal' " . |
| 479 |
"-e 'xp=(\$3+rand(.35*recno-15))*(($dim[1]-$dim[0])/$nx)+$dim[0]' " . |
| 480 |
"-e 'yp=(\$2+rand(.86*recno+11))*(($dim[3]-$dim[2])/$ny)+$dim[2]' " . |
| 481 |
"-e 'zp:$dim[5]' " . |
| 482 |
q{-e 'Kbin=$1;x1=rand(1.21*recno+2.75);x2=rand(-3.55*recno-7.57)' } . |
| 483 |
q{-e '$1=xp-Dx;$2=yp-Dy;$3=zp+Dz;$4=Dx;$5=Dy;$6=-Dz' } . |
| 484 |
"| $rtcmd"; |
| 485 |
system "$cmd" || die "Failure running: $cmd\n"; |
| 486 |
@tbarr = `$rccmd $td/$bmodnm.flt`; |
| 487 |
die "Failure running: $rccmd $td/$bmodnm.flt\n" if ( $? ); |
| 488 |
chomp(@tbarr); |
| 489 |
@rbarr = `$rccmd $td/$fmodnm.flt`; |
| 490 |
die "Failure running: $rccmd $td/$fmodnm.flt\n" if ( $? ); |
| 491 |
chomp(@rbarr); |
| 492 |
} |
| 493 |
# Output angle basis |
| 494 |
print |
| 495 |
' <DataDefinition> |
| 496 |
<IncidentDataStructure>Columns</IncidentDataStructure> |
| 497 |
<AngleBasis> |
| 498 |
<AngleBasisName>LBNL/Klems Full</AngleBasisName> |
| 499 |
<AngleBasisBlock> |
| 500 |
<Theta>0</Theta> |
| 501 |
<nPhis>1</nPhis> |
| 502 |
<ThetaBounds> |
| 503 |
<LowerTheta>0</LowerTheta> |
| 504 |
<UpperTheta>5</UpperTheta> |
| 505 |
</ThetaBounds> |
| 506 |
</AngleBasisBlock> |
| 507 |
<AngleBasisBlock> |
| 508 |
<Theta>10</Theta> |
| 509 |
<nPhis>8</nPhis> |
| 510 |
<ThetaBounds> |
| 511 |
<LowerTheta>5</LowerTheta> |
| 512 |
<UpperTheta>15</UpperTheta> |
| 513 |
</ThetaBounds> |
| 514 |
</AngleBasisBlock> |
| 515 |
<AngleBasisBlock> |
| 516 |
<Theta>20</Theta> |
| 517 |
<nPhis>16</nPhis> |
| 518 |
<ThetaBounds> |
| 519 |
<LowerTheta>15</LowerTheta> |
| 520 |
<UpperTheta>25</UpperTheta> |
| 521 |
</ThetaBounds> |
| 522 |
</AngleBasisBlock> |
| 523 |
<AngleBasisBlock> |
| 524 |
<Theta>30</Theta> |
| 525 |
<nPhis>20</nPhis> |
| 526 |
<ThetaBounds> |
| 527 |
<LowerTheta>25</LowerTheta> |
| 528 |
<UpperTheta>35</UpperTheta> |
| 529 |
</ThetaBounds> |
| 530 |
</AngleBasisBlock> |
| 531 |
<AngleBasisBlock> |
| 532 |
<Theta>40</Theta> |
| 533 |
<nPhis>24</nPhis> |
| 534 |
<ThetaBounds> |
| 535 |
<LowerTheta>35</LowerTheta> |
| 536 |
<UpperTheta>45</UpperTheta> |
| 537 |
</ThetaBounds> |
| 538 |
</AngleBasisBlock> |
| 539 |
<AngleBasisBlock> |
| 540 |
<Theta>50</Theta> |
| 541 |
<nPhis>24</nPhis> |
| 542 |
<ThetaBounds> |
| 543 |
<LowerTheta>45</LowerTheta> |
| 544 |
<UpperTheta>55</UpperTheta> |
| 545 |
</ThetaBounds> |
| 546 |
</AngleBasisBlock> |
| 547 |
<AngleBasisBlock> |
| 548 |
<Theta>60</Theta> |
| 549 |
<nPhis>24</nPhis> |
| 550 |
<ThetaBounds> |
| 551 |
<LowerTheta>55</LowerTheta> |
| 552 |
<UpperTheta>65</UpperTheta> |
| 553 |
</ThetaBounds> |
| 554 |
</AngleBasisBlock> |
| 555 |
<AngleBasisBlock> |
| 556 |
<Theta>70</Theta> |
| 557 |
<nPhis>16</nPhis> |
| 558 |
<ThetaBounds> |
| 559 |
<LowerTheta>65</LowerTheta> |
| 560 |
<UpperTheta>75</UpperTheta> |
| 561 |
</ThetaBounds> |
| 562 |
</AngleBasisBlock> |
| 563 |
<AngleBasisBlock> |
| 564 |
<Theta>82.5</Theta> |
| 565 |
<nPhis>12</nPhis> |
| 566 |
<ThetaBounds> |
| 567 |
<LowerTheta>75</LowerTheta> |
| 568 |
<UpperTheta>90</UpperTheta> |
| 569 |
</ThetaBounds> |
| 570 |
</AngleBasisBlock> |
| 571 |
</AngleBasis> |
| 572 |
</DataDefinition> |
| 573 |
'; |
| 574 |
if ( $doforw ) { |
| 575 |
print |
| 576 |
' <WavelengthData> |
| 577 |
<LayerNumber>System</LayerNumber> |
| 578 |
<Wavelength unit="Integral">Visible</Wavelength> |
| 579 |
<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
| 580 |
<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
| 581 |
<WavelengthDataBlock> |
| 582 |
<WavelengthDataDirection>Transmission Front</WavelengthDataDirection> |
| 583 |
<ColumnAngleBasis>LBNL/Klems Full</ColumnAngleBasis> |
| 584 |
<RowAngleBasis>LBNL/Klems Full</RowAngleBasis> |
| 585 |
<ScatteringDataType>BTDF</ScatteringDataType> |
| 586 |
<ScatteringData> |
| 587 |
'; |
| 588 |
# Output front transmission (transposed order) |
| 589 |
for (my $od = 0; $od < $ndiv; $od++) { |
| 590 |
for (my $id = 0; $id < $ndiv; $id++) { |
| 591 |
print $tfarr[$ndiv*$id + $od], ",\n"; |
| 592 |
} |
| 593 |
print "\n"; |
| 594 |
} |
| 595 |
print |
| 596 |
' </ScatteringData> |
| 597 |
</WavelengthDataBlock> |
| 598 |
</WavelengthData> |
| 599 |
<WavelengthData> |
| 600 |
<LayerNumber>System</LayerNumber> |
| 601 |
<Wavelength unit="Integral">Visible</Wavelength> |
| 602 |
<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
| 603 |
<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
| 604 |
<WavelengthDataBlock> |
| 605 |
<WavelengthDataDirection>Reflection Front</WavelengthDataDirection> |
| 606 |
<ColumnAngleBasis>LBNL/Klems Full</ColumnAngleBasis> |
| 607 |
<RowAngleBasis>LBNL/Klems Full</RowAngleBasis> |
| 608 |
<ScatteringDataType>BRDF</ScatteringDataType> |
| 609 |
<ScatteringData> |
| 610 |
'; |
| 611 |
# Output front reflection (transposed order) |
| 612 |
for (my $od = 0; $od < $ndiv; $od++) { |
| 613 |
for (my $id = 0; $id < $ndiv; $id++) { |
| 614 |
print $rfarr[$ndiv*$id + $od], ",\n"; |
| 615 |
} |
| 616 |
print "\n"; |
| 617 |
} |
| 618 |
print |
| 619 |
' </ScatteringData> |
| 620 |
</WavelengthDataBlock> |
| 621 |
</WavelengthData> |
| 622 |
'; |
| 623 |
} |
| 624 |
if ( $doback ) { |
| 625 |
print |
| 626 |
' <WavelengthData> |
| 627 |
<LayerNumber>System</LayerNumber> |
| 628 |
<Wavelength unit="Integral">Visible</Wavelength> |
| 629 |
<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
| 630 |
<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
| 631 |
<WavelengthDataBlock> |
| 632 |
<WavelengthDataDirection>Transmission Back</WavelengthDataDirection> |
| 633 |
<ColumnAngleBasis>LBNL/Klems Full</ColumnAngleBasis> |
| 634 |
<RowAngleBasis>LBNL/Klems Full</RowAngleBasis> |
| 635 |
<ScatteringDataType>BTDF</ScatteringDataType> |
| 636 |
<ScatteringData> |
| 637 |
'; |
| 638 |
# Output back transmission (transposed order) |
| 639 |
for (my $od = 0; $od < $ndiv; $od++) { |
| 640 |
for (my $id = 0; $id < $ndiv; $id++) { |
| 641 |
print $tbarr[$ndiv*$id + $od], ",\n"; |
| 642 |
} |
| 643 |
print "\n"; |
| 644 |
} |
| 645 |
print |
| 646 |
' </ScatteringData> |
| 647 |
</WavelengthDataBlock> |
| 648 |
</WavelengthData> |
| 649 |
<WavelengthData> |
| 650 |
<LayerNumber>System</LayerNumber> |
| 651 |
<Wavelength unit="Integral">Visible</Wavelength> |
| 652 |
<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
| 653 |
<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
| 654 |
<WavelengthDataBlock> |
| 655 |
<WavelengthDataDirection>Reflection Back</WavelengthDataDirection> |
| 656 |
<ColumnAngleBasis>LBNL/Klems Full</ColumnAngleBasis> |
| 657 |
<RowAngleBasis>LBNL/Klems Full</RowAngleBasis> |
| 658 |
<ScatteringDataType>BRDF</ScatteringDataType> |
| 659 |
<ScatteringData> |
| 660 |
'; |
| 661 |
# Output back reflection (transposed order) |
| 662 |
for (my $od = 0; $od < $ndiv; $od++) { |
| 663 |
for (my $id = 0; $id < $ndiv; $id++) { |
| 664 |
print $rbarr[$ndiv*$id + $od], ",\n"; |
| 665 |
} |
| 666 |
print "\n"; |
| 667 |
} |
| 668 |
print |
| 669 |
' </ScatteringData> |
| 670 |
</WavelengthDataBlock> |
| 671 |
</WavelengthData> |
| 672 |
'; |
| 673 |
} |
| 674 |
} |
| 675 |
#------------- End of do_matrix_bsdf() --------------# |
