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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

# User Rev Content
1 greg 2.1 #!/usr/bin/perl -w
2 greg 2.2 # RCSid $Id: genklemsamp.pl,v 2.1 2009/06/14 00:33:16 greg Exp $
3 greg 2.1 #
4     # Sample Klems (full) directions impinging on surface(s)
5     #
6 greg 2.2 # G. Ward
7     #
8 greg 2.1 if ($#ARGV < 0) {
9 greg 2.2 print STDERR, "Usage: genklemsamp [-c N ][-f{a|f|d}] [view opts] [geom.rad ..]\n";
10 greg 2.1 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 greg 2.2 print STDERR, "Unsupported view option: $ARGV[0]\n";
31 greg 2.1 exit 1;
32     } elsif ("$ARGV[0]" =~ /^-./) {
33 greg 2.2 print STDERR, "Unknown option: $ARGV[0]\n";
34 greg 2.1 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 greg 2.2 print STDERR, "View direction does not correspond to any surfaces\n";
103 greg 2.1 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";