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root/radiance/ray/src/util/genklemsamp.pl
Revision: 2.1
Committed: Sun Jun 14 00:33:16 2009 UTC (13 years, 5 months ago) by greg
Content type: text/plain
Branch: MAIN
Log Message:
Added new genklemsamp utility and made vwright more useful

File Contents

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