/usr/bin/genklemsamp is in radiance 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | #!/usr/bin/perl -w
# RCSid $Id: genklemsamp.pl,v 2.8 2011/01/27 22:28:12 greg Exp $
#
# Sample Klems (full) directions impinging on surface(s)
#
# G. Ward
#
use strict;
if ($#ARGV < 0) {
print STDERR "Usage: genklemsamp [-c N ][-f{a|f|d}] [view opts] [geom.rad ..]\n";
exit 1;
}
my $td = `mktemp -d /tmp/genklemsamp.XXXXXX`;
chomp $td;
my $nsamp = 1000;
my $fmt = "a";
my @vopts="-vo 1e-5";
while ($#ARGV >= 0) {
if ("$ARGV[0]" eq "-c") {
shift @ARGV;
$nsamp = $ARGV[0];
} elsif ("$ARGV[0]" =~ /^-f[afd]$/) {
$fmt = substr($ARGV[0], 2, 1);
} elsif ("$ARGV[0]" =~ /^-v[pdu]$/) {
push @vopts, "@ARGV[0..3]";
shift @ARGV; shift @ARGV; shift @ARGV;
} elsif ("$ARGV[0]" =~ /^-v[fhvo]$/) {
push @vopts, "@ARGV[0..1]";
shift @ARGV;
} elsif ("$ARGV[0]" =~ /^-v./) {
print STDERR "Unsupported view option: $ARGV[0]\n";
exit 1;
} elsif ("$ARGV[0]" =~ /^-./) {
print STDERR "Unknown option: $ARGV[0]\n";
exit 1;
} else {
last;
}
shift @ARGV;
}
my $ofmt = "";
$ofmt = "-o$fmt" if ("$fmt" ne "a");
# Require parallel view and compile settings
push @vopts, "-vtl";
my $vwset = `vwright @vopts V`;
$_ = $vwset; s/^.*Vhn://; s/;.*$//;
my $width = $_;
$_ = $vwset; s/^.*Vvn://; s/;.*$//;
my $height = $_;
my $sca = sqrt($nsamp/($width*$height));
# Kbin is input to get direction in full Klems basis with (x1,x2) randoms
my $tcal = '
DEGREE : PI/180;
Kpola(r) : select(r+1, -5, 5, 15, 25, 35, 45, 55, 65, 75, 90);
Knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12);
Kaccum(r) : if(r-.5, Knaz(r) + Kaccum(r-1), 0);
Kmax : Kaccum(Knaz(0));
Kfindrow(r, rem) : if(rem-Knaz(r)-.5, Kfindrow(r+1, rem-Knaz(r)), r);
Krow = if(Kbin-(Kmax+.5), 0, Kfindrow(1, Kbin));
Kcol = Kbin - Kaccum(Krow-1) - 1;
Kazi = 360*DEGREE * (Kcol + .5 - x2) / Knaz(Krow);
Kpol = DEGREE * (x1*Kpola(Krow) + (1-x1)*Kpola(Krow-1));
sin_kpol = sin(Kpol);
K0 = cos(Kazi)*sin_kpol;
K1 = sin(Kazi)*sin_kpol;
K2 = sqrt(1 - sin_kpol*sin_kpol);
';
my $ndiv = 145;
# Do we have any Radiance input files?
if ($#ARGV >= 0) {
system "oconv -f @ARGV > $td/surf.oct";
# Set our own view center and size based on bounding cube
$_ = $vwset; s/^.*Vdx://; s/;.*$//;
my @vd = $_;
$_ = $vwset; s/^.*Vdy://; s/;.*$//;
push @vd, $_;
$_ = $vwset; s/^.*Vdz://; s/;.*$//;
push @vd, $_;
my @bcube = split ' ', `getinfo -d < $td/surf.oct`;
$width = $bcube[3]*sqrt(3);
$height = $width;
push @vopts, ("-vp", $bcube[0]+$bcube[3]/2-$width/2*$vd[0],
$bcube[1]+$bcube[3]/2-$width/2*$vd[1],
$bcube[2]+$bcube[3]/2-$width/2*$vd[2]);
push @vopts, ("-vh", $width, "-vv", $height);
$vwset = `vwright @vopts V`;
$sca = sqrt($nsamp/($width*$height));
my $xres;
my $yres;
my $ntot = 0;
# This generally passes through the loop twice to get density right
while ($ntot < $nsamp) {
$xres = int($width*$sca) + 1;
$yres = int($height*$sca) + 1;
system "vwrays -ff -x $xres -y $yres -pa 0 -pj .7 @vopts " .
"| rtrace -w -h -ff -opLN $td/surf.oct " .
q{| rcalc -e 'cond=and(5e9-$4,nOK);$1=$1;$2=$2;$3=$3' } .
"-e 'and(a,b):if(a,b,a);sq(x):x*x' -e '$vwset' " .
q{-e 'nOK=sq(Vdx*$5+Vdy*$6+Vdz*$7)-.999' } .
"-if7 -of > $td/origins.flt";
$ntot = -s "$td/origins.flt";
$ntot /= 3*4; # number of bytes per sample position
if ($ntot == 0) {
if ($nsamp < 200) {
$sca = sqrt(200/($width*$height));
redo;
}
print STDERR "View direction does not correspond to any surfaces\n";
exit 1;
}
$sca *= 1.05 * sqrt($nsamp/$ntot);
}
# All set to produce our samples
for (my $k = 1; $k <= $ndiv; $k++) {
my $rn = rand(10);
my $r1 = rand; my $r2 = rand;
# Chance of using = (number_still_needed)/(number_left_avail)
system "rcalc $ofmt -e '$tcal' -e '$vwset' " .
"-e 'cond=($nsamp-outno+1)/($ntot-recno+1)-rand($rn+recno)' " .
"-e 'Kbin=$k;x1=rand($r1+recno);x2=rand($r2+recno)' " .
q{-e '$1=$1+Vo*Vdx; $2=$2+Vo*Vdy; $3=$3+Vo*Vdz' } .
q{-e '$4=K0*Vhx-K1*Vvx+K2*Vdx' } .
q{-e '$5=K0*Vhy-K1*Vvy+K2*Vdy' } .
q{-e '$6=K0*Vhz-K1*Vvz+K2*Vdz' } .
"-if3 $td/origins.flt";
}
} else {
# No Radiance input files, so just sample over parallel view
my $xres = int($width*$sca) + 1;
my $yres = int($height*$sca) + 1;
my $ntot = $xres * $yres;
for (my $k = 1; $k <= $ndiv; $k++) {
my $rn = rand(10);
my $r1 = rand; my $r2 = rand;
my $r3 = rand; my $r4 = rand;
# Chance of using = (number_still_needed)/(number_left_avail)
system "cnt $yres $xres | rcalc $ofmt -e '$tcal' -e '$vwset' " .
q{-e 'xc=$2;yc=$1' } .
"-e 'cond=($nsamp-outno+1)/($ntot-recno+1)-rand($rn+recno)' " .
"-e 'Kbin=$k;x1=rand($r1+recno);x2=rand($r2+recno)' " .
"-e 'hpos=Vhn*((xc+rand($r3+recno))/$xres - .5)' " .
"-e 'vpos=Vvn*((yc+rand($r4+recno))/$yres - .5)' " .
q{-e '$1=Vpx+Vo*Vdx+hpos*Vhx+vpos*Vvx' } .
q{-e '$2=Vpy+Vo*Vdy+hpos*Vhy+vpos*Vvy' } .
q{-e '$3=Vpz+Vo*Vdz+hpos*Vhz+vpos*Vvz' } .
q{-e '$4=K0*Vhx-K1*Vvx+K2*Vdx' } .
q{-e '$5=K0*Vhy-K1*Vvy+K2*Vdy' } .
q{-e '$6=K0*Vhz-K1*Vvz+K2*Vdz' } ;
}
}
system "rm -rf $td";
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