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#!/usr/bin/perl -w
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# RCSid $Id: genskyvec.pl,v 2.6 2011/05/16 23:56:32 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 $windoz = ($^O eq "MSWin32" or $^O eq "MSWin64");
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my @skycolor = (0.960, 1.004, 1.118);
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my $mf = 4;
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while ($#ARGV >= 0) {
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if ("$ARGV[0]" eq "-c") {
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@skycolor = @ARGV[1..3];
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shift @ARGV; shift @ARGV; shift @ARGV;
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} elsif ("$ARGV[0]" eq "-m") {
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$mf = $ARGV[1];
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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(' ', $skydesc[$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(' ', $skydesc[$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 = 'DEGREE : PI/180;' .
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'x1 = .5; x2 = .5;' .
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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-1, 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(-x1));' .
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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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my ($nbins, $octree, $tregcommand, $suncmd);
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if ($windoz) {
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$nbins = `rcalc -n -e MF:$mf -e \"$rhcal\" -e \"\$1=Rmax+1\"`;
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chomp $nbins;
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$octree = "gtv$$.oct";
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$tregcommand = "cnt $nbins 16 | rcalc -e MF:$mf -e \"$rhcal\" " .
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q{-e "Rbin=$1;x1=rand(recno*.37-5.3);x2=rand(recno*-1.47+.86)" } .
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q{-e "$1=0;$2=0;$3=0;$4=Dx;$5=Dy;$6=Dz" } .
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"| rtrace -h -ab 0 -w $octree | total -16 -m";
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if (@sundir) {
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$suncmd = "cnt " . ($nbins-1) .
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" | rcalc -e MF:$mf -e \"$rhcal\" -e Rbin=recno " .
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"-e \"dot=Dx*$sundir[0] + Dy*$sundir[1] + Dz*$sundir[2]\" " .
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"-e \"cond=dot-.866\" " .
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q{-e "$1=if(1-dot,acos(dot),0);$2=Romega;$3=recno" };
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}
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} else {
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$nbins = `rcalc -n -e MF:$mf -e \'$rhcal\' -e \'\$1=Rmax+1\'`;
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chomp $nbins;
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$octree = "/tmp/gtv$$.oct";
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$tregcommand = "cnt $nbins 16 | rcalc -of -e MF:$mf -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 $octree | total -if3 -16 -m";
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if (@sundir) {
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$suncmd = "cnt " . ($nbins-1) .
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" | rcalc -e MF:$mf -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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}
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}
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# Create octree for rtrace
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open OCONV, "| oconv - > $octree";
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print OCONV @skydesc;
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print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n";
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print OCONV "skyglow source sky 0 0 4 0 0 1 360\n";
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close OCONV;
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# Run rtrace and average output for every 16 samples
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my @tregval = `$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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sub numSort1 {
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my @a1 = split("\t", $a);
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my @b1 = split("\t", $b);
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return ($a1[0] <=> $b1[0]);
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}
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if (@sundir) {
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my $somega = ($sundir[3]/360)**2 * 3.141592654**3;
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my @bestdir = `$suncmd`;
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@bestdir = sort numSort1 @bestdir;
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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(' ', $bestdir[$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(' ', $tregval[$ndx[$i]]);
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for my $j (0..2) { $scolor[$j] += $wt * $sunval[$j]; }
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$tregval[$ndx[$i]] = "$scolor[0]\t$scolor[1]\t$scolor[2]\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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