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root/radiance/ray/src/util/genskyvec.pl
Revision: 2.8
Committed: Thu Jun 28 20:48:03 2012 UTC (10 years, 5 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad4R2P1, rad4R2
Changes since 2.7: +19 -11 lines
Log Message:
Added -d option for sun-only vector

File Contents

# User Rev Content
1 greg 2.1 #!/usr/bin/perl -w
2 greg 2.8 # RCSid $Id: genskyvec.pl,v 2.7 2011/09/29 22:36:11 greg Exp $
3 greg 2.1 #
4     # Generate Reinhart vector for a given sky description
5     #
6     # G. Ward
7     #
8     use strict;
9 greg 2.6 my $windoz = ($^O eq "MSWin32" or $^O eq "MSWin64");
10 greg 2.1 my @skycolor = (0.960, 1.004, 1.118);
11 greg 2.3 my $mf = 4;
12 greg 2.8 my $dosky = 1;
13 greg 2.1 while ($#ARGV >= 0) {
14     if ("$ARGV[0]" eq "-c") {
15     @skycolor = @ARGV[1..3];
16 greg 2.8 shift @ARGV for (1..3);
17 greg 2.3 } elsif ("$ARGV[0]" eq "-m") {
18     $mf = $ARGV[1];
19     shift @ARGV;
20 greg 2.8 } elsif ("$ARGV[0]" eq "-d") {
21     $dosky = 0;
22 greg 2.1 }
23     shift @ARGV;
24     }
25     # Load sky description into line array, separating sun if one
26     my @skydesc;
27     my $lightline;
28     my @sunval;
29     my $sunline;
30     my $skyOK = 0;
31     my $srcmod; # putting this inside loop breaks code(?!)
32     while (<>) {
33     push @skydesc, $_;
34     if (/^\w+\s+light\s+/) {
35     s/\s*$//; s/^.*\s//;
36     $srcmod = $_;
37     $lightline = $#skydesc;
38     } elsif (defined($srcmod) && /^($srcmod)\s+source\s/) {
39 greg 2.5 @sunval = split(' ', $skydesc[$lightline + 3]);
40 greg 2.1 shift @sunval;
41     $sunline = $#skydesc;
42     } elsif (/\sskyfunc\s*$/) {
43     $skyOK = 1;
44     }
45     }
46     die "Bad sky description!\n" if (! $skyOK);
47     # Strip out the solar source if present
48     my @sundir;
49     if (defined $sunline) {
50 greg 2.5 @sundir = split(' ', $skydesc[$sunline + 3]);
51 greg 2.1 shift @sundir;
52     undef @sundir if ($sundir[2] <= 0);
53     splice(@skydesc, $sunline, 5);
54     }
55     # Reinhart sky sample generator
56 greg 2.6 my $rhcal = 'DEGREE : PI/180;' .
57     'x1 = .5; x2 = .5;' .
58     'alpha : 90/(MF*7 + .5);' .
59     'tnaz(r) : select(r, 30, 30, 24, 24, 18, 12, 6);' .
60     'rnaz(r) : if(r-(7*MF-.5), 1, MF*tnaz(floor((r+.5)/MF) + 1));' .
61     'raccum(r) : if(r-.5, rnaz(r-1) + raccum(r-1), 0);' .
62     'RowMax : 7*MF + 1;' .
63     'Rmax : raccum(RowMax);' .
64     'Rfindrow(r, rem) : if(rem-rnaz(r)-.5, Rfindrow(r+1, rem-rnaz(r)), r);' .
65     'Rrow = if(Rbin-(Rmax-.5), RowMax-1, Rfindrow(0, Rbin));' .
66     'Rcol = Rbin - raccum(Rrow) - 1;' .
67     'Razi_width = 2*PI / rnaz(Rrow);' .
68     'RAH : alpha*DEGREE;' .
69     'Razi = if(Rbin-.5, (Rcol + x2 - .5)*Razi_width, 2*PI*x2);' .
70     'Ralt = if(Rbin-.5, (Rrow + x1)*RAH, asin(-x1));' .
71     'Romega = if(.5-Rbin, 2*PI, if(Rmax-.5-Rbin, ' .
72     ' Razi_width*(sin(RAH*(Rrow+1)) - sin(RAH*Rrow)),' .
73     ' 2*PI*(1 - cos(RAH/2)) ) );' .
74     'cos_ralt = cos(Ralt);' .
75     'Dx = sin(Razi)*cos_ralt;' .
76     'Dy = cos(Razi)*cos_ralt;' .
77     'Dz = sin(Ralt);' ;
78     my ($nbins, $octree, $tregcommand, $suncmd);
79     if ($windoz) {
80     $nbins = `rcalc -n -e MF:$mf -e \"$rhcal\" -e \"\$1=Rmax+1\"`;
81     chomp $nbins;
82     $octree = "gtv$$.oct";
83     $tregcommand = "cnt $nbins 16 | rcalc -e MF:$mf -e \"$rhcal\" " .
84     q{-e "Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)" } .
85     q{-e "$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz" } .
86     "| rtrace -h -ab 0 -w $octree | total -16 -m";
87 greg 2.7 if (@sundir) {
88     $suncmd = "cnt " . ($nbins-1) .
89     " | rcalc -e MF:$mf -e \"$rhcal\" -e Rbin=recno " .
90     "-e \"dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]\" " .
91     "-e \"cond=dot-.866\" " .
92     q{-e "$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno" };
93     }
94 greg 2.6 } else {
95     $nbins = `rcalc -n -e MF:$mf -e \'$rhcal\' -e \'\$1=Rmax+1\'`;
96     chomp $nbins;
97     $octree = "/tmp/gtv$$.oct";
98     $tregcommand = "cnt $nbins 16 | rcalc -of -e MF:$mf -e '$rhcal' " .
99     q{-e 'Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)' } .
100     q{-e '$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz' } .
101     "| rtrace -h -ff -ab 0 -w $octree | total -if3 -16 -m";
102 greg 2.7 if (@sundir) {
103     $suncmd = "cnt " . ($nbins-1) .
104     " | rcalc -e MF:$mf -e '$rhcal' -e Rbin=recno " .
105     "-e 'dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]' " .
106     "-e 'cond=dot-.866' " .
107     q{-e '$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno' };
108     }
109 greg 2.6 }
110 greg 2.8 my @tregval;
111     if ($dosky) {
112     # Create octree for rtrace
113     open OCONV, "| oconv - > $octree";
114     print OCONV @skydesc;
115     print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n";
116     print OCONV "skyglow source sky 0 0 4 0 0 1 360\n";
117     close OCONV;
118     # Run rtrace and average output for every 16 samples
119     @tregval = `$tregcommand`;
120     unlink $octree;
121     } else {
122     push @tregval, "0\t0\t0\n" for (1..$nbins);
123     }
124 greg 2.1 # Find closest 3 patches to sun and divvy up direct solar contribution
125 greg 2.6 sub numSort1 {
126     my @a1 = split("\t", $a);
127     my @b1 = split("\t", $b);
128     return ($a1[0] <=> $b1[0]);
129     }
130 greg 2.1 if (@sundir) {
131     my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
132 greg 2.6 my @bestdir = `$suncmd`;
133     @bestdir = sort numSort1 @bestdir;
134 greg 2.1 my (@ang, @dom, @ndx);
135     my $wtot = 0;
136     for my $i (0..2) {
137 greg 2.5 ($ang[$i], $dom[$i], $ndx[$i]) = split(' ', $bestdir[$i]);
138 greg 2.1 $wtot += 1./($ang[$i]+.02);
139     }
140     for my $i (0..2) {
141     my $wt = 1./($ang[$i]+.02)/$wtot * $somega / $dom[$i];
142 greg 2.5 my @scolor = split(' ', $tregval[$ndx[$i]]);
143 greg 2.1 for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
144 greg 2.4 $tregval[$ndx[$i]] = "$scolor[0]\t$scolor[1]\t$scolor[2]\n";
145 greg 2.1 }
146     }
147     # Output our final vector
148     print @tregval;