ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/util/genskyvec.pl
Revision: 2.2
Committed: Mon Jul 13 23:45:08 2009 UTC (13 years, 4 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.1: +5 -4 lines
Log Message:
Fixed bug in ground sampling vectors

File Contents

# Content
1 #!/usr/bin/perl -w
2 # RCSid $Id: genskyvec.pl,v 2.1 2009/07/02 02:13:08 greg Exp $
3 #
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 while ($#ARGV >= 0) {
11 if ("$ARGV[0]" eq "-c") {
12 @skycolor = @ARGV[1..3];
13 shift @ARGV; shift @ARGV; shift @ARGV;
14 }
15 shift @ARGV;
16 }
17 # Load sky description into line array, separating sun if one
18 my @skydesc;
19 my $lightline;
20 my @sunval;
21 my $sunline;
22 my $skyOK = 0;
23 my $srcmod; # putting this inside loop breaks code(?!)
24 while (<>) {
25 push @skydesc, $_;
26 if (/^\w+\s+light\s+/) {
27 s/\s*$//; s/^.*\s//;
28 $srcmod = $_;
29 $lightline = $#skydesc;
30 } elsif (defined($srcmod) && /^($srcmod)\s+source\s/) {
31 @sunval = split(/\s+/, $skydesc[$lightline + 3]);
32 shift @sunval;
33 $sunline = $#skydesc;
34 } elsif (/\sskyfunc\s*$/) {
35 $skyOK = 1;
36 }
37 }
38 die "Bad sky description!\n" if (! $skyOK);
39 # Strip out the solar source if present
40 my @sundir;
41 if (defined $sunline) {
42 @sundir = split(/\s+/, $skydesc[$sunline + 3]);
43 shift @sundir;
44 undef @sundir if ($sundir[2] <= 0);
45 splice(@skydesc, $sunline, 5);
46 }
47 # Reinhart sky sample generator
48 my $rhcal = '
49 DEGREE : PI/180;
50 x1 = .5; x2 = .5;
51 MF : 2^2;
52 alpha : 90/(MF*7 + .5);
53 tnaz(r) : select(r, 30, 30, 24, 24, 18, 12, 6);
54 rnaz(r) : if(r-(7*MF-.5), 1, MF*tnaz(floor((r+.5)/MF) + 1));
55 raccum(r) : if(r-.5, rnaz(r-1) + raccum(r-1), 0);
56 RowMax : 7*MF + 1;
57 Rmax : raccum(RowMax);
58 Rfindrow(r, rem) : if(rem-rnaz(r)-.5, Rfindrow(r+1, rem-rnaz(r)), r);
59 Rrow = if(Rbin-(Rmax-.5), RowMax-1, Rfindrow(0, Rbin));
60 Rcol = Rbin - raccum(Rrow) - 1;
61 Razi_width = 2*PI / rnaz(Rrow);
62 RAH : alpha*DEGREE;
63 Razi = if(Rbin-.5, (Rcol + x2 - .5)*Razi_width, 2*PI*x2);
64 Ralt = if(Rbin-.5, (Rrow + x1)*RAH, asin(-x1));
65 Romega = if(.5-Rbin, 2*PI, if(Rmax-.5-Rbin,
66 Razi_width*(sin(RAH*(Rrow+1)) - sin(RAH*Rrow)),
67 2*PI*(1 - cos(RAH/2)) ) );
68 cos_ralt = cos(Ralt);
69 Dx = sin(Razi)*cos_ralt;
70 Dy = cos(Razi)*cos_ralt;
71 Dz = sin(Ralt);
72 ';
73 my $nbins = 2306; # This needs to be consistent with MF setting above
74 # Create octree for rtrace
75 my $octree = "/tmp/gtv$$.oct";
76 open OCONV, "| oconv - > $octree";
77 print OCONV @skydesc;
78 print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n";
79 print OCONV "skyglow source sky 0 0 4 0 0 1 360\n";
80 close OCONV;
81 # Run rtrace and average output for every 16 samples
82 my $tregcommand = "cnt $nbins 16 | rcalc -of -e '$rhcal' " .
83 q{-e 'Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)' } .
84 q{-e '$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz' } .
85 "| rtrace -h -ff -ab 0 -w $octree | total -if3 -16 -m";
86 my @tregval = `$tregcommand`;
87 unlink $octree;
88 # Find closest 3 patches to sun and divvy up direct solar contribution
89 my @bestdir;
90 if (@sundir) {
91 my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
92 my $cmd = "cnt " . ($nbins-1) .
93 " | rcalc -e '$rhcal' -e Rbin=recno " .
94 "-e 'dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]' " .
95 "-e 'cond=dot-.866' " .
96 q{-e '$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno' };
97 @bestdir = `$cmd | sort -n | head -3`;
98 my (@ang, @dom, @ndx);
99 my $wtot = 0;
100 for my $i (0..2) {
101 ($ang[$i], $dom[$i], $ndx[$i]) = split(/\s+/, $bestdir[$i]);
102 $wtot += 1./($ang[$i]+.02);
103 }
104 for my $i (0..2) {
105 my $wt = 1./($ang[$i]+.02)/$wtot * $somega / $dom[$i];
106 my @scolor = split(/\s+/, $tregval[$ndx[$i]]);
107 for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
108 $tregval[$ndx[$i]] = "@scolor\n";
109 }
110 }
111 # Output our final vector
112 print @tregval;