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root/radiance/ray/src/util/genskyvec.pl
Revision: 2.3
Committed: Wed Dec 9 21:30:48 2009 UTC (12 years, 11 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.2: +9 -5 lines
Log Message:
Added -m option to control sky subdivision

File Contents

# User Rev Content
1 greg 2.1 #!/usr/bin/perl -w
2 greg 2.3 # RCSid $Id: genskyvec.pl,v 2.2 2009/07/13 23:45:08 greg Exp $
3 greg 2.1 #
4     # Generate Reinhart vector for a given sky description
5     #
6     # G. Ward
7     #
8     use strict;
9     my @skycolor = (0.960, 1.004, 1.118);
10 greg 2.3 my $mf = 4;
11 greg 2.1 while ($#ARGV >= 0) {
12     if ("$ARGV[0]" eq "-c") {
13     @skycolor = @ARGV[1..3];
14     shift @ARGV; shift @ARGV; shift @ARGV;
15 greg 2.3 } elsif ("$ARGV[0]" eq "-m") {
16     $mf = $ARGV[1];
17     shift @ARGV;
18 greg 2.1 }
19     shift @ARGV;
20     }
21     # Load sky description into line array, separating sun if one
22     my @skydesc;
23     my $lightline;
24     my @sunval;
25     my $sunline;
26     my $skyOK = 0;
27     my $srcmod; # putting this inside loop breaks code(?!)
28     while (<>) {
29     push @skydesc, $_;
30     if (/^\w+\s+light\s+/) {
31     s/\s*$//; s/^.*\s//;
32     $srcmod = $_;
33     $lightline = $#skydesc;
34     } elsif (defined($srcmod) && /^($srcmod)\s+source\s/) {
35     @sunval = split(/\s+/, $skydesc[$lightline + 3]);
36     shift @sunval;
37     $sunline = $#skydesc;
38     } elsif (/\sskyfunc\s*$/) {
39     $skyOK = 1;
40     }
41     }
42     die "Bad sky description!\n" if (! $skyOK);
43     # Strip out the solar source if present
44     my @sundir;
45     if (defined $sunline) {
46     @sundir = split(/\s+/, $skydesc[$sunline + 3]);
47     shift @sundir;
48     undef @sundir if ($sundir[2] <= 0);
49     splice(@skydesc, $sunline, 5);
50     }
51     # Reinhart sky sample generator
52     my $rhcal = '
53     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 greg 2.2 Rrow = if(Rbin-(Rmax-.5), RowMax-1, Rfindrow(0, Rbin));
63 greg 2.1 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 greg 2.2 Ralt = if(Rbin-.5, (Rrow + x1)*RAH, asin(-x1));
68 greg 2.1 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     ';
76 greg 2.3 my $nbins = `rcalc -n -e MF:$mf -e \'$rhcal\' -e \'\$1=Rmax+1\'`;
77     chomp $nbins;
78 greg 2.1 # Create octree for rtrace
79     my $octree = "/tmp/gtv$$.oct";
80     open OCONV, "| oconv - > $octree";
81     print OCONV @skydesc;
82     print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n";
83     print OCONV "skyglow source sky 0 0 4 0 0 1 360\n";
84     close OCONV;
85     # Run rtrace and average output for every 16 samples
86 greg 2.3 my $tregcommand = "cnt $nbins 16 | rcalc -of -e MF:$mf -e '$rhcal' " .
87 greg 2.1 q{-e 'Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)' } .
88     q{-e '$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz' } .
89     "| rtrace -h -ff -ab 0 -w $octree | total -if3 -16 -m";
90     my @tregval = `$tregcommand`;
91     unlink $octree;
92     # Find closest 3 patches to sun and divvy up direct solar contribution
93     my @bestdir;
94     if (@sundir) {
95     my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
96 greg 2.2 my $cmd = "cnt " . ($nbins-1) .
97 greg 2.3 " | rcalc -e MF:$mf -e '$rhcal' -e Rbin=recno " .
98 greg 2.1 "-e 'dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]' " .
99     "-e 'cond=dot-.866' " .
100     q{-e '$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno' };
101     @bestdir = `$cmd | sort -n | head -3`;
102     my (@ang, @dom, @ndx);
103     my $wtot = 0;
104     for my $i (0..2) {
105     ($ang[$i], $dom[$i], $ndx[$i]) = split(/\s+/, $bestdir[$i]);
106     $wtot += 1./($ang[$i]+.02);
107     }
108     for my $i (0..2) {
109     my $wt = 1./($ang[$i]+.02)/$wtot * $somega / $dom[$i];
110     my @scolor = split(/\s+/, $tregval[$ndx[$i]]);
111     for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
112     $tregval[$ndx[$i]] = "@scolor\n";
113     }
114     }
115     # Output our final vector
116     print @tregval;