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root/radiance/ray/src/util/genskyvec.pl
Revision: 2.7
Committed: Thu Sep 29 22:36:11 2011 UTC (11 years, 2 months ago) by greg
Content type: text/plain
Branch: MAIN
CVS Tags: rad4R1
Changes since 2.6: +15 -11 lines
Log Message:
Fixed bug when no sun present

File Contents

# User Rev Content
1 greg 2.1 #!/usr/bin/perl -w
2 greg 2.7 # RCSid $Id: genskyvec.pl,v 2.6 2011/05/16 23:56:32 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 $mf = 4;
12 greg 2.1 while ($#ARGV >= 0) {
13     if ("$ARGV[0]" eq "-c") {
14     @skycolor = @ARGV[1..3];
15     shift @ARGV; shift @ARGV; shift @ARGV;
16 greg 2.3 } elsif ("$ARGV[0]" eq "-m") {
17     $mf = $ARGV[1];
18     shift @ARGV;
19 greg 2.1 }
20     shift @ARGV;
21     }
22     # Load sky description into line array, separating sun if one
23     my @skydesc;
24     my $lightline;
25     my @sunval;
26     my $sunline;
27     my $skyOK = 0;
28     my $srcmod; # putting this inside loop breaks code(?!)
29     while (<>) {
30     push @skydesc, $_;
31     if (/^\w+\s+light\s+/) {
32     s/\s*$//; s/^.*\s//;
33     $srcmod = $_;
34     $lightline = $#skydesc;
35     } elsif (defined($srcmod) && /^($srcmod)\s+source\s/) {
36 greg 2.5 @sunval = split(' ', $skydesc[$lightline + 3]);
37 greg 2.1 shift @sunval;
38     $sunline = $#skydesc;
39     } elsif (/\sskyfunc\s*$/) {
40     $skyOK = 1;
41     }
42     }
43     die "Bad sky description!\n" if (! $skyOK);
44     # Strip out the solar source if present
45     my @sundir;
46     if (defined $sunline) {
47 greg 2.5 @sundir = split(' ', $skydesc[$sunline + 3]);
48 greg 2.1 shift @sundir;
49     undef @sundir if ($sundir[2] <= 0);
50     splice(@skydesc, $sunline, 5);
51     }
52     # Reinhart sky sample generator
53 greg 2.6 my $rhcal = 'DEGREE : PI/180;' .
54     'x1 = .5; x2 = .5;' .
55     'alpha : 90/(MF*7 + .5);' .
56     'tnaz(r) : select(r, 30, 30, 24, 24, 18, 12, 6);' .
57     'rnaz(r) : if(r-(7*MF-.5), 1, MF*tnaz(floor((r+.5)/MF) + 1));' .
58     'raccum(r) : if(r-.5, rnaz(r-1) + raccum(r-1), 0);' .
59     'RowMax : 7*MF + 1;' .
60     'Rmax : raccum(RowMax);' .
61     'Rfindrow(r, rem) : if(rem-rnaz(r)-.5, Rfindrow(r+1, rem-rnaz(r)), r);' .
62     'Rrow = if(Rbin-(Rmax-.5), RowMax-1, Rfindrow(0, Rbin));' .
63     'Rcol = Rbin - raccum(Rrow) - 1;' .
64     'Razi_width = 2*PI / rnaz(Rrow);' .
65     'RAH : alpha*DEGREE;' .
66     'Razi = if(Rbin-.5, (Rcol + x2 - .5)*Razi_width, 2*PI*x2);' .
67     'Ralt = if(Rbin-.5, (Rrow + x1)*RAH, asin(-x1));' .
68     'Romega = if(.5-Rbin, 2*PI, if(Rmax-.5-Rbin, ' .
69     ' Razi_width*(sin(RAH*(Rrow+1)) - sin(RAH*Rrow)),' .
70     ' 2*PI*(1 - cos(RAH/2)) ) );' .
71     'cos_ralt = cos(Ralt);' .
72     'Dx = sin(Razi)*cos_ralt;' .
73     'Dy = cos(Razi)*cos_ralt;' .
74     'Dz = sin(Ralt);' ;
75     my ($nbins, $octree, $tregcommand, $suncmd);
76     if ($windoz) {
77     $nbins = `rcalc -n -e MF:$mf -e \"$rhcal\" -e \"\$1=Rmax+1\"`;
78     chomp $nbins;
79     $octree = "gtv$$.oct";
80     $tregcommand = "cnt $nbins 16 | rcalc -e MF:$mf -e \"$rhcal\" " .
81     q{-e "Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)" } .
82     q{-e "$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz" } .
83     "| rtrace -h -ab 0 -w $octree | total -16 -m";
84 greg 2.7 if (@sundir) {
85     $suncmd = "cnt " . ($nbins-1) .
86     " | rcalc -e MF:$mf -e \"$rhcal\" -e Rbin=recno " .
87     "-e \"dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]\" " .
88     "-e \"cond=dot-.866\" " .
89     q{-e "$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno" };
90     }
91 greg 2.6 } else {
92     $nbins = `rcalc -n -e MF:$mf -e \'$rhcal\' -e \'\$1=Rmax+1\'`;
93     chomp $nbins;
94     $octree = "/tmp/gtv$$.oct";
95     $tregcommand = "cnt $nbins 16 | rcalc -of -e MF:$mf -e '$rhcal' " .
96     q{-e 'Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)' } .
97     q{-e '$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz' } .
98     "| rtrace -h -ff -ab 0 -w $octree | total -if3 -16 -m";
99 greg 2.7 if (@sundir) {
100     $suncmd = "cnt " . ($nbins-1) .
101     " | rcalc -e MF:$mf -e '$rhcal' -e Rbin=recno " .
102     "-e 'dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]' " .
103     "-e 'cond=dot-.866' " .
104     q{-e '$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno' };
105     }
106 greg 2.6 }
107 greg 2.1 # Create octree for rtrace
108     open OCONV, "| oconv - > $octree";
109     print OCONV @skydesc;
110     print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n";
111     print OCONV "skyglow source sky 0 0 4 0 0 1 360\n";
112     close OCONV;
113     # Run rtrace and average output for every 16 samples
114     my @tregval = `$tregcommand`;
115     unlink $octree;
116     # Find closest 3 patches to sun and divvy up direct solar contribution
117 greg 2.6 sub numSort1 {
118     my @a1 = split("\t", $a);
119     my @b1 = split("\t", $b);
120     return ($a1[0] <=> $b1[0]);
121     }
122 greg 2.1 if (@sundir) {
123     my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
124 greg 2.6 my @bestdir = `$suncmd`;
125     @bestdir = sort numSort1 @bestdir;
126 greg 2.1 my (@ang, @dom, @ndx);
127     my $wtot = 0;
128     for my $i (0..2) {
129 greg 2.5 ($ang[$i], $dom[$i], $ndx[$i]) = split(' ', $bestdir[$i]);
130 greg 2.1 $wtot += 1./($ang[$i]+.02);
131     }
132     for my $i (0..2) {
133     my $wt = 1./($ang[$i]+.02)/$wtot * $somega / $dom[$i];
134 greg 2.5 my @scolor = split(' ', $tregval[$ndx[$i]]);
135 greg 2.1 for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
136 greg 2.4 $tregval[$ndx[$i]] = "$scolor[0]\t$scolor[1]\t$scolor[2]\n";
137 greg 2.1 }
138     }
139     # Output our final vector
140     print @tregval;