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greg |
2.1 |
#!/usr/bin/perl -w |
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greg |
2.7 |
# RCSid $Id: genklemsamp.pl,v 2.6 2009/11/05 06:30:57 greg Exp $ |
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greg |
2.1 |
# |
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# Sample Klems (full) directions impinging on surface(s) |
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# |
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greg |
2.2 |
# G. Ward |
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# |
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greg |
2.3 |
use strict; |
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greg |
2.1 |
if ($#ARGV < 0) { |
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greg |
2.4 |
print STDERR "Usage: genklemsamp [-c N ][-f{a|f|d}] [view opts] [geom.rad ..]\n"; |
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greg |
2.1 |
exit 1; |
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} |
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my $td = `mktemp -d /tmp/genklemsamp.XXXXXX`; |
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chomp $td; |
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my $nsamp = 1000; |
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my $fmt = "a"; |
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my @vopts="-vo 1e-5"; |
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while ($#ARGV >= 0) { |
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if ("$ARGV[0]" eq "-c") { |
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shift @ARGV; |
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$nsamp = $ARGV[0]; |
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} elsif ("$ARGV[0]" =~ /^-f[afd]$/) { |
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$fmt = substr($ARGV[0], 2, 1); |
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} elsif ("$ARGV[0]" =~ /^-v[pdu]$/) { |
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push @vopts, "@ARGV[0..3]"; |
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shift @ARGV; shift @ARGV; shift @ARGV; |
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} elsif ("$ARGV[0]" =~ /^-v[fhvo]$/) { |
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push @vopts, "@ARGV[0..1]"; |
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shift @ARGV; |
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} elsif ("$ARGV[0]" =~ /^-v./) { |
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greg |
2.4 |
print STDERR "Unsupported view option: $ARGV[0]\n"; |
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greg |
2.1 |
exit 1; |
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} elsif ("$ARGV[0]" =~ /^-./) { |
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greg |
2.4 |
print STDERR "Unknown option: $ARGV[0]\n"; |
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greg |
2.1 |
exit 1; |
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} else { |
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last; |
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} |
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shift @ARGV; |
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} |
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my $ofmt = ""; |
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$ofmt = "-o$fmt" if ("$fmt" ne "a"); |
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# Require parallel view and compile settings |
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push @vopts, "-vtl"; |
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my $vwset = `vwright @vopts V`; |
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$_ = $vwset; s/^.*Vhn://; s/;.*$//; |
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my $width = $_; |
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$_ = $vwset; s/^.*Vvn://; s/;.*$//; |
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my $height = $_; |
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my $sca = sqrt($nsamp/($width*$height)); |
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# Kbin is input to get direction in full Klems basis with (x1,x2) randoms |
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my $tcal = ' |
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DEGREE : PI/180; |
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Kpola(r) : select(r+1, -5, 5, 15, 25, 35, 45, 55, 65, 75, 90); |
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Knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12); |
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Kaccum(r) : if(r-.5, Knaz(r) + Kaccum(r-1), 0); |
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Kmax : Kaccum(Knaz(0)); |
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Kfindrow(r, rem) : if(rem-Knaz(r)-.5, Kfindrow(r+1, rem-Knaz(r)), r); |
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Krow = if(Kbin-(Kmax+.5), 0, Kfindrow(1, Kbin)); |
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Kcol = Kbin - Kaccum(Krow-1) - 1; |
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Kazi = 360*DEGREE * (Kcol + .5 - x2) / Knaz(Krow); |
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Kpol = DEGREE * (x1*Kpola(Krow) + (1-x1)*Kpola(Krow-1)); |
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sin_kpol = sin(Kpol); |
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K0 = cos(Kazi)*sin_kpol; |
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K1 = sin(Kazi)*sin_kpol; |
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greg |
2.5 |
K2 = sqrt(1 - sin_kpol*sin_kpol); |
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greg |
2.1 |
'; |
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my $ndiv = 145; |
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# Do we have any Radiance input files? |
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if ($#ARGV >= 0) { |
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system "oconv -f @ARGV > $td/surf.oct"; |
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# Set our own view center and size based on bounding cube |
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$_ = $vwset; s/^.*Vdx://; s/;.*$//; |
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my @vd = $_; |
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$_ = $vwset; s/^.*Vdy://; s/;.*$//; |
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push @vd, $_; |
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$_ = $vwset; s/^.*Vdz://; s/;.*$//; |
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push @vd, $_; |
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my @bcube = split /\s+/, `getinfo -d < $td/surf.oct`; |
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$width = $bcube[3]*sqrt(3); |
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$height = $width; |
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push @vopts, ("-vp", $bcube[0]+$bcube[3]/2-$width/2*$vd[0], |
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$bcube[1]+$bcube[3]/2-$width/2*$vd[1], |
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$bcube[2]+$bcube[3]/2-$width/2*$vd[2]); |
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greg |
2.7 |
push @vopts, ("-vh", $width, "-vv", $height); |
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greg |
2.1 |
$vwset = `vwright @vopts V`; |
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greg |
2.6 |
$sca = sqrt($nsamp/($width*$height)); |
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greg |
2.1 |
my $xres; |
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my $yres; |
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greg |
2.4 |
my $ntot = 0; |
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greg |
2.1 |
# This generally passes through the loop twice to get density right |
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greg |
2.4 |
while ($ntot < $nsamp) { |
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greg |
2.1 |
$xres = int($width*$sca) + 1; |
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$yres = int($height*$sca) + 1; |
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system "vwrays -ff -x $xres -y $yres -pa 0 -pj .7 @vopts " . |
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"| rtrace -w -h -ff -opLN $td/surf.oct " . |
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q{| rcalc -e 'cond=and(5e9-$4,nOK);$1=$1;$2=$2;$3=$3' } . |
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"-e 'and(a,b):if(a,b,a);sq(x):x*x' -e '$vwset' " . |
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q{-e 'nOK=sq(Vdx*$5+Vdy*$6+Vdz*$7)-.999' } . |
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"-if7 -of > $td/origins.flt"; |
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$ntot = -s "$td/origins.flt"; |
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greg |
2.7 |
$ntot /= 3*4; # number of bytes per sample position |
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greg |
2.1 |
if ($ntot == 0) { |
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greg |
2.6 |
if ($nsamp < 200) { |
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greg |
2.4 |
$sca = sqrt(200/($width*$height)); |
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redo; |
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} |
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print STDERR "View direction does not correspond to any surfaces\n"; |
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greg |
2.1 |
exit 1; |
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} |
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$sca *= 1.05 * sqrt($nsamp/$ntot); |
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greg |
2.4 |
} |
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greg |
2.1 |
# All set to produce our samples |
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greg |
2.4 |
for (my $k = 1; $k <= $ndiv; $k++) { |
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greg |
2.1 |
my $rn = rand(10); |
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my $r1 = rand; my $r2 = rand; |
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# Chance of using = (number_still_needed)/(number_left_avail) |
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system "rcalc $ofmt -e '$tcal' -e '$vwset' " . |
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"-e 'cond=($nsamp-outno+1)/($ntot-recno+1)-rand($rn+recno)' " . |
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"-e 'Kbin=$k;x1=rand($r1+recno);x2=rand($r2+recno)' " . |
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q{-e '$1=$1+Vo*Vdx; $2=$2+Vo*Vdy; $3=$3+Vo*Vdz' } . |
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greg |
2.5 |
q{-e '$4=K0*Vhx-K1*Vvx+K2*Vdx' } . |
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q{-e '$5=K0*Vhy-K1*Vvy+K2*Vdy' } . |
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q{-e '$6=K0*Vhz-K1*Vvz+K2*Vdz' } . |
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greg |
2.1 |
"-if3 $td/origins.flt"; |
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} |
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} else { |
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# No Radiance input files, so just sample over parallel view |
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my $xres = int($width*$sca) + 1; |
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my $yres = int($height*$sca) + 1; |
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my $ntot = $xres * $yres; |
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greg |
2.4 |
for (my $k = 1; $k <= $ndiv; $k++) { |
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greg |
2.1 |
my $rn = rand(10); |
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my $r1 = rand; my $r2 = rand; |
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my $r3 = rand; my $r4 = rand; |
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# Chance of using = (number_still_needed)/(number_left_avail) |
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system "cnt $yres $xres | rcalc $ofmt -e '$tcal' -e '$vwset' " . |
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q{-e 'xc=$2;yc=$1' } . |
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"-e 'cond=($nsamp-outno+1)/($ntot-recno+1)-rand($rn+recno)' " . |
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"-e 'Kbin=$k;x1=rand($r1+recno);x2=rand($r2+recno)' " . |
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"-e 'hpos=Vhn*((xc+rand($r3+recno))/$xres - .5)' " . |
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"-e 'vpos=Vvn*((yc+rand($r4+recno))/$yres - .5)' " . |
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q{-e '$1=Vpx+Vo*Vdx+hpos*Vhx+vpos*Vvx' } . |
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q{-e '$2=Vpy+Vo*Vdy+hpos*Vhy+vpos*Vvy' } . |
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q{-e '$3=Vpz+Vo*Vdz+hpos*Vhz+vpos*Vvz' } . |
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greg |
2.5 |
q{-e '$4=K0*Vhx-K1*Vvx+K2*Vdx' } . |
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q{-e '$5=K0*Vhy-K1*Vvy+K2*Vdy' } . |
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q{-e '$6=K0*Vhz-K1*Vvz+K2*Vdz' } ; |
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greg |
2.1 |
} |
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} |
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system "rm -rf $td"; |
