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#!/usr/bin/perl -w |
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# RCSid $Id: genskyvec.pl,v 2.9 2014/09/17 22:40:49 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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my $dosky = 1; |
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my $headout = 1; |
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my @origARGV = @ARGV; |
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while ($#ARGV >= 0) { |
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if ("$ARGV[0]" eq "-c") { |
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@skycolor = @ARGV[1..3]; |
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shift @ARGV for (1..3); |
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} elsif ("$ARGV[0]" eq "-m") { |
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$mf = $ARGV[1]; |
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shift @ARGV; |
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} elsif ("$ARGV[0]" eq "-d") { |
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$dosky = 0; |
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} elsif ("$ARGV[0]" eq "-h") { |
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$headout = 0; |
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} else { |
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die "Unexpected command-line argument: $ARGV[0]\n"; |
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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;$3=recno' }; |
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} |
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} |
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my @tregval; |
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if ($dosky) { |
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# Create octree for rtrace |
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open OCONV, "| oconv - > $octree"; |
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print OCONV @skydesc; |
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print OCONV "skyfunc glow skyglow 0 0 4 @skycolor 0\n"; |
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print OCONV "skyglow source sky 0 0 4 0 0 1 360\n"; |
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close OCONV; |
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# Run rtrace and average output for every 16 samples |
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@tregval = `$tregcommand`; |
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unlink $octree; |
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} else { |
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push @tregval, "0\t0\t0\n" for (1..$nbins); |
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} |
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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 header if requested |
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if ($headout) { |
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print "#?RADIANCE\n"; |
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print "genskyvec @origARGV\n"; |
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print "NROWS=", $#tregval+1, "\n"; |
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print "NCOLS=1\nNCOMP=3\n"; |
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print "FORMAT=ascii\n"; |
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print "\n"; |
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} |
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# Output our final vector |
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print @tregval; |
