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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

# Content
1 #!/usr/bin/perl -w
2 # RCSid $Id: genskyvec.pl,v 2.7 2011/09/29 22:36:11 greg Exp $
3 #
4 # Generate Reinhart vector for a given sky description
5 #
6 # G. Ward
7 #
8 use strict;
9 my $windoz = ($^O eq "MSWin32" or $^O eq "MSWin64");
10 my @skycolor = (0.960, 1.004, 1.118);
11 my $mf = 4;
12 my $dosky = 1;
13 while ($#ARGV >= 0) {
14 if ("$ARGV[0]" eq "-c") {
15 @skycolor = @ARGV[1..3];
16 shift @ARGV for (1..3);
17 } elsif ("$ARGV[0]" eq "-m") {
18 $mf = $ARGV[1];
19 shift @ARGV;
20 } elsif ("$ARGV[0]" eq "-d") {
21 $dosky = 0;
22 }
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 @sunval = split(' ', $skydesc[$lightline + 3]);
40 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 @sundir = split(' ', $skydesc[$sunline + 3]);
51 shift @sundir;
52 undef @sundir if ($sundir[2] <= 0);
53 splice(@skydesc, $sunline, 5);
54 }
55 # Reinhart sky sample generator
56 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$$.oct";
83 $tregcommand = "cnt $nbins 16 | rcalc -e MF:$mf -e \"$rhcal\" " .
84 q{-e "Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)" } .
85 q{-e "$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz" } .
86 "| rtrace -h -ab 0 -w $octree | total -16 -m";
87 if (@sundir) {
88 $suncmd = "cnt " . ($nbins-1) .
89 " | rcalc -e MF:$mf -e \"$rhcal\" -e Rbin=recno " .
90 "-e \"dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]\" " .
91 "-e \"cond=dot-.866\" " .
92 q{-e "$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno" };
93 }
94 } else {
95 $nbins = `rcalc -n -e MF:$mf -e \'$rhcal\' -e \'\$1=Rmax+1\'`;
96 chomp $nbins;
97 $octree = "/tmp/gtv$$.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 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;$3=recno' };
108 }
109 }
110 my @tregval;
111 if ($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 # Find closest 3 patches to sun and divvy up direct solar contribution
125 sub numSort1 {
126 my @a1 = split("\t", $a);
127 my @b1 = split("\t", $b);
128 return ($a1[0] <=> $b1[0]);
129 }
130 if (@sundir) {
131 my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
132 my @bestdir = `$suncmd`;
133 @bestdir = sort numSort1 @bestdir;
134 my (@ang, @dom, @ndx);
135 my $wtot = 0;
136 for my $i (0..2) {
137 ($ang[$i], $dom[$i], $ndx[$i]) = split(' ', $bestdir[$i]);
138 $wtot += 1./($ang[$i]+.02);
139 }
140 for my $i (0..2) {
141 my $wt = 1./($ang[$i]+.02)/$wtot * $somega / $dom[$i];
142 my @scolor = split(' ', $tregval[$ndx[$i]]);
143 for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
144 $tregval[$ndx[$i]] = "$scolor[0]\t$scolor[1]\t$scolor[2]\n";
145 }
146 }
147 # Output our final vector
148 print @tregval;