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root/radiance/ray/src/util/genklemsamp.pl
Revision: 2.2
Committed: Tue Jun 16 04:54:08 2009 UTC (13 years, 5 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.1: +7 -5 lines
Log Message:
Created gentregvec utility to evaluate Tregenza sky patches

File Contents

# Content
1 #!/usr/bin/perl -w
2 # RCSid $Id: genklemsamp.pl,v 2.1 2009/06/14 00:33:16 greg Exp $
3 #
4 # Sample Klems (full) directions impinging on surface(s)
5 #
6 # G. Ward
7 #
8 if ($#ARGV < 0) {
9 print STDERR, "Usage: genklemsamp [-c N ][-f{a|f|d}] [view opts] [geom.rad ..]\n";
10 exit 1;
11 }
12 my $td = `mktemp -d /tmp/genklemsamp.XXXXXX`;
13 chomp $td;
14 my $nsamp = 1000;
15 my $fmt = "a";
16 my @vopts="-vo 1e-5";
17 while ($#ARGV >= 0) {
18 if ("$ARGV[0]" eq "-c") {
19 shift @ARGV;
20 $nsamp = $ARGV[0];
21 } elsif ("$ARGV[0]" =~ /^-f[afd]$/) {
22 $fmt = substr($ARGV[0], 2, 1);
23 } elsif ("$ARGV[0]" =~ /^-v[pdu]$/) {
24 push @vopts, "@ARGV[0..3]";
25 shift @ARGV; shift @ARGV; shift @ARGV;
26 } elsif ("$ARGV[0]" =~ /^-v[fhvo]$/) {
27 push @vopts, "@ARGV[0..1]";
28 shift @ARGV;
29 } elsif ("$ARGV[0]" =~ /^-v./) {
30 print STDERR, "Unsupported view option: $ARGV[0]\n";
31 exit 1;
32 } elsif ("$ARGV[0]" =~ /^-./) {
33 print STDERR, "Unknown option: $ARGV[0]\n";
34 exit 1;
35 } else {
36 last;
37 }
38 shift @ARGV;
39 }
40 my $ofmt = "";
41 $ofmt = "-o$fmt" if ("$fmt" ne "a");
42 # Require parallel view and compile settings
43 push @vopts, "-vtl";
44 my $vwset = `vwright @vopts V`;
45 $_ = $vwset; s/^.*Vhn://; s/;.*$//;
46 my $width = $_;
47 $_ = $vwset; s/^.*Vvn://; s/;.*$//;
48 my $height = $_;
49 my $sca = sqrt($nsamp/($width*$height));
50 # Kbin is input to get direction in full Klems basis with (x1,x2) randoms
51 my $tcal = '
52 DEGREE : PI/180;
53 Kpola(r) : select(r+1, -5, 5, 15, 25, 35, 45, 55, 65, 75, 90);
54 Knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12);
55 Kaccum(r) : if(r-.5, Knaz(r) + Kaccum(r-1), 0);
56 Kmax : Kaccum(Knaz(0));
57 Kfindrow(r, rem) : if(rem-Knaz(r)-.5, Kfindrow(r+1, rem-Knaz(r)), r);
58 Krow = if(Kbin-(Kmax+.5), 0, Kfindrow(1, Kbin));
59 Kcol = Kbin - Kaccum(Krow-1) - 1;
60 Kazi = 360*DEGREE * (Kcol + .5 - x2) / Knaz(Krow);
61 Kpol = DEGREE * (x1*Kpola(Krow) + (1-x1)*Kpola(Krow-1));
62 sin_kpol = sin(Kpol);
63 K0 = cos(Kazi)*sin_kpol;
64 K1 = sin(Kazi)*sin_kpol;
65 K2 = cos(Kpol);
66 ';
67 my $ndiv = 145;
68 # Do we have any Radiance input files?
69 if ($#ARGV >= 0) {
70 system "oconv -f @ARGV > $td/surf.oct";
71 # Set our own view center and size based on bounding cube
72 $_ = $vwset; s/^.*Vdx://; s/;.*$//;
73 my @vd = $_;
74 $_ = $vwset; s/^.*Vdy://; s/;.*$//;
75 push @vd, $_;
76 $_ = $vwset; s/^.*Vdz://; s/;.*$//;
77 push @vd, $_;
78 my @bcube = split /\s+/, `getinfo -d < $td/surf.oct`;
79 $width = $bcube[3]*sqrt(3);
80 $height = $width;
81 push @vopts, ("-vp", $bcube[0]+$bcube[3]/2-$width/2*$vd[0],
82 $bcube[1]+$bcube[3]/2-$width/2*$vd[1],
83 $bcube[2]+$bcube[3]/2-$width/2*$vd[2]);
84 push @vopts, ("-vh", $width, "-vh", $height);
85 $vwset = `vwright @vopts V`;
86 my $xres;
87 my $yres;
88 my $ntot;
89 # This generally passes through the loop twice to get density right
90 do {
91 $xres = int($width*$sca) + 1;
92 $yres = int($height*$sca) + 1;
93 system "vwrays -ff -x $xres -y $yres -pa 0 -pj .7 @vopts " .
94 "| rtrace -w -h -ff -opLN $td/surf.oct " .
95 q{| rcalc -e 'cond=and(5e9-$4,nOK);$1=$1;$2=$2;$3=$3' } .
96 "-e 'and(a,b):if(a,b,a);sq(x):x*x' -e '$vwset' " .
97 q{-e 'nOK=sq(Vdx*$5+Vdy*$6+Vdz*$7)-.999' } .
98 "-if7 -of > $td/origins.flt";
99 $ntot = -s "$td/origins.flt";
100 $ntot /= 3*4;
101 if ($ntot == 0) {
102 print STDERR, "View direction does not correspond to any surfaces\n";
103 exit 1;
104 }
105 $sca *= 1.05 * sqrt($nsamp/$ntot);
106 } while ($ntot < $nsamp);
107 # All set to produce our samples
108 for ($k = 1; $k <= $ndiv; $k++) {
109 my $rn = rand(10);
110 my $r1 = rand; my $r2 = rand;
111 # Chance of using = (number_still_needed)/(number_left_avail)
112 system "rcalc $ofmt -e '$tcal' -e '$vwset' " .
113 "-e 'cond=($nsamp-outno+1)/($ntot-recno+1)-rand($rn+recno)' " .
114 "-e 'Kbin=$k;x1=rand($r1+recno);x2=rand($r2+recno)' " .
115 q{-e '$1=$1+Vo*Vdx; $2=$2+Vo*Vdy; $3=$3+Vo*Vdz' } .
116 q{-e '$4=K0*Vhx+K1*Vvx+K2*Vdx' } .
117 q{-e '$5=K0*Vhy+K1*Vvy+K2*Vdy' } .
118 q{-e '$6=K0*Vhz+K1*Vvz+K2*Vdz' } .
119 "-if3 $td/origins.flt";
120 }
121 } else {
122 # No Radiance input files, so just sample over parallel view
123 my $xres = int($width*$sca) + 1;
124 my $yres = int($height*$sca) + 1;
125 my $ntot = $xres * $yres;
126 for ($k = 1; $k <= $ndiv; $k++) {
127 my $rn = rand(10);
128 my $r1 = rand; my $r2 = rand;
129 my $r3 = rand; my $r4 = rand;
130 # Chance of using = (number_still_needed)/(number_left_avail)
131 system "cnt $yres $xres | rcalc $ofmt -e '$tcal' -e '$vwset' " .
132 q{-e 'xc=$2;yc=$1' } .
133 "-e 'cond=($nsamp-outno+1)/($ntot-recno+1)-rand($rn+recno)' " .
134 "-e 'Kbin=$k;x1=rand($r1+recno);x2=rand($r2+recno)' " .
135 "-e 'hpos=Vhn*((xc+rand($r3+recno))/$xres - .5)' " .
136 "-e 'vpos=Vvn*((yc+rand($r4+recno))/$yres - .5)' " .
137 q{-e '$1=Vpx+Vo*Vdx+hpos*Vhx+vpos*Vvx' } .
138 q{-e '$2=Vpy+Vo*Vdy+hpos*Vhy+vpos*Vvy' } .
139 q{-e '$3=Vpz+Vo*Vdz+hpos*Vhz+vpos*Vvz' } .
140 q{-e '$4=K0*Vhx+K1*Vvx+K2*Vdx' } .
141 q{-e '$5=K0*Vhy+K1*Vvy+K2*Vdy' } .
142 q{-e '$6=K0*Vhz+K1*Vvz+K2*Vdz' } ;
143 }
144 }
145 system "rm -rf $td";