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greg |
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#!/usr/bin/perl -w
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# RCSid $Id: gentregvec.pl,v 2.4 2009/06/24 19:19:38 greg Exp $
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#
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# Generate Reinhart vector for a given sky description
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#
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# G. Ward
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#
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use strict;
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my @skycolor = (0.960, 1.004, 1.118);
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while ($#ARGV >= 0) {
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if ("$ARGV[0]" eq "-c") {
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@skycolor = @ARGV[1..3];
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shift @ARGV; shift @ARGV; shift @ARGV;
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}
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shift @ARGV;
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}
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# Load sky description into line array, separating sun if one
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my @skydesc;
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my $lightline;
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my @sunval;
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my $sunline;
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my $skyOK = 0;
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my $srcmod; # putting this inside loop breaks code(?!)
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while (<>) {
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push @skydesc, $_;
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if (/^\w+\s+light\s+/) {
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s/\s*$//; s/^.*\s//;
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$srcmod = $_;
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$lightline = $#skydesc;
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} elsif (defined($srcmod) && /^($srcmod)\s+source\s/) {
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@sunval = split(/\s+/, $skydesc[$lightline + 3]);
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shift @sunval;
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$sunline = $#skydesc;
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} elsif (/\sskyfunc\s*$/) {
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$skyOK = 1;
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}
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}
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die "Bad sky description!\n" if (! $skyOK);
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# Strip out the solar source if present
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my @sundir;
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if (defined $sunline) {
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@sundir = split(/\s+/, $skydesc[$sunline + 3]);
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shift @sundir;
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undef @sundir if ($sundir[2] <= 0);
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splice(@skydesc, $sunline, 5);
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}
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# Reinhart sky sample generator
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my $rhcal = '
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DEGREE : PI/180;
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x1 = .5; x2 = .5;
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MF : 2^2;
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alpha : 90/(MF*7 + .5);
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tnaz(r) : select(r, 30, 30, 24, 24, 18, 12, 6);
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rnaz(r) : if(r-(7*MF-.5), 1, MF*tnaz(floor((r+.5)/MF) + 1));
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raccum(r) : if(r-.5, rnaz(r-1) + raccum(r-1), 0);
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RowMax : 7*MF + 1;
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Rmax : raccum(RowMax);
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Rfindrow(r, rem) : if(rem-rnaz(r)-.5, Rfindrow(r+1, rem-rnaz(r)), r);
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Rrow = if(Rbin-(Rmax +.5), RowMax, Rfindrow(0, Rbin));
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Rcol = Rbin - raccum(Rrow) - 1;
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Razi_width = 2*PI / rnaz(Rrow);
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RAH : alpha*DEGREE;
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Razi = if(Rbin-.5, (Rcol + x2 - .5)*Razi_width, 2*PI*x2);
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Ralt = if(Rbin-.5, (Rrow + x1)*RAH, asin(2*x1-1));
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Romega = if(.5-Rbin, 2*PI, if(Rmax-.5-Rbin,
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Razi_width*(sin(RAH*(Rrow+1)) - sin(RAH*Rrow)),
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2*PI*(1 - cos(RAH/2)) ) );
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cos_ralt = cos(Ralt);
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Dx = sin(Razi)*cos_ralt;
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Dy = cos(Razi)*cos_ralt;
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Dz = sin(Ralt);
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';
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my $nbins = 2306; # This needs to be consistent with MF setting above
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# Create octree for rtrace
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my $octree = "/tmp/gtv$$.oct";
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open OCONV, "| oconv - > $octree";
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print OCONV @skydesc;
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print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n";
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print OCONV "skyglow source sky 0 0 4 0 0 1 360\n";
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close OCONV;
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# Run rtrace and average output for every 16 samples
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my $tregcommand = "cnt $nbins 16 | rcalc -of -e '$rhcal' " .
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q{-e 'Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)' } .
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q{-e '$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz' } .
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"| rtrace -h -ff -ab 0 -w $octree | total -if3 -16 -m";
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my @tregval = `$tregcommand`;
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unlink $octree;
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# Find closest 3 patches to sun and divvy up direct solar contribution
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my @bestdir;
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if (@sundir) {
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my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
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my $cmd = "cnt $nbins | rcalc -e '$rhcal' -e Rbin=recno " .
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"-e 'dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]' " .
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"-e 'cond=dot-.866' " .
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q{-e '$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno' };
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@bestdir = `$cmd | sort -n | head -3`;
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my (@ang, @dom, @ndx);
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my $wtot = 0;
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for my $i (0..2) {
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($ang[$i], $dom[$i], $ndx[$i]) = split(/\s+/, $bestdir[$i]);
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$wtot += 1./($ang[$i]+.02);
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}
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for my $i (0..2) {
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my $wt = 1./($ang[$i]+.02)/$wtot * $somega / $dom[$i];
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my @scolor = split(/\s+/, $tregval[$ndx[$i]]);
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for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
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$tregval[$ndx[$i]] = "@scolor\n";
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}
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}
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# Output our final vector
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print @tregval;
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