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#!/usr/bin/perl -w |
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# RCSid $Id: genBSDF.pl,v 2.1 2010/09/02 02:29:24 greg Exp $ |
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# |
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# Compute BSDF based on geometry and material 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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sub userror { |
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print STDERR "Usage: genBSDF [-n Nproc][-c Nsamp][-dim xmin xmax ymin ymax zmin zmax][{+|-}mgf][{+|-}geom] [input ..]"; |
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exit 1; |
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} |
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my $td = `mktemp -d /tmp/genBSDF.XXXXXX`; |
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chomp $td; |
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my $nsamp = 1000; |
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my $mgfin = 0; |
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my $geout = 1; |
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my $nproc = 1; |
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my @dim; |
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# Get options |
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while ($#ARGV >= 0) { |
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if ("$ARGV[0]" =~ /^[-+]m/) { |
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$mgfin = ("$ARGV[0]" =~ /^\+/); |
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} elsif ("$ARGV[0]" =~ /^[-+]g/) { |
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$geout = ("$ARGV[0]" =~ /^\+/); |
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} elsif ("$ARGV[0]" eq "-c") { |
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$nsamp = $ARGV[1]; |
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shift @ARGV; |
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} elsif ("$ARGV[0]" eq "-n") { |
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$nproc = $ARGV[1]; |
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shift @ARGV; |
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} elsif ("$ARGV[0]" =~ /^-d/) { |
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userror() if ($#ARGV < 6); |
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@dim = "@ARGV[1..6]"; |
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shift @ARGV for (1..6); |
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} elsif ("$ARGV[0]" =~ /^[-+]./) { |
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userror(); |
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} else { |
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last; |
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} |
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shift @ARGV; |
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} |
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# Get scene description and dimensions |
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my $radscn = "$td/device.rad"; |
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my $mgfscn = "$td/device.mgf"; |
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my $octree = "$td/device.oct"; |
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if ( $mgfin ) { |
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system "mgfilt '#,o,xf,c,cxy,cspec,cmix,m,sides,rd,td,rs,ts,ir,v,p,n,f,fh,sph,cyl,cone,prism,ring,torus' @ARGV > $mgfscn"; |
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die "Could not load MGF input\n" if ( $? ); |
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system "mgf2rad $mgfscn > $radscn"; |
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} else { |
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system "cat @ARGV | xform -e > $radscn"; |
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die "Could not load Radiance input\n" if ( $? ); |
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system "rad2mgf $radscn > $mgfscn" if ( $geout ); |
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} |
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if ($#dim != 5) { |
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@dim = split /\s+/, `getbbox -h $radscn`; |
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shift @dim; |
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} |
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print STDERR "Warning: Device extends into room\n" if ($dim[5] > 1e-5); |
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# Add receiver surface (rectangle) |
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my $modnm="_receiver_black_"; |
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open(RADSCN, ">> $radscn"); |
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print RADSCN "void glow $modnm\n0\n0\n4 0 0 0 0\n\n"; |
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print RADSCN "$modnm polygon _receiver_\n0\n0\n12\n"; |
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print RADSCN "\t",$dim[0],"\t",$dim[2],"\t",$dim[5]+1e-5,"\n"; |
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print RADSCN "\t",$dim[0],"\t",$dim[3],"\t",$dim[5]+1e-5,"\n"; |
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print RADSCN "\t",$dim[1],"\t",$dim[3],"\t",$dim[5]+1e-5,"\n"; |
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print RADSCN "\t",$dim[1],"\t",$dim[2],"\t",$dim[5]+1e-5,"\n"; |
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close RADSCN; |
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# Generate octree |
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system "oconv -w $radscn > $octree"; |
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die "Could not compile scene\n" if ( $? ); |
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# Set up sampling |
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# Kbin to produce incident direction in full Klems basis with (x1,x2) randoms |
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my $tcal = ' |
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DEGREE : PI/180; |
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Kpola(r) : select(r+1, -5, 5, 15, 25, 35, 45, 55, 65, 75, 90); |
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Knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12); |
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Kaccum(r) : if(r-.5, Knaz(r) + Kaccum(r-1), 0); |
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Kmax : Kaccum(Knaz(0)); |
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Kfindrow(r, rem) : if(rem-Knaz(r)+.5, Kfindrow(r+1, rem-Knaz(r)), r); |
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Krow = if(Kbin-(Kmax-.5), 0, Kfindrow(1, Kbin)); |
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Kcol = Kbin - Kaccum(Krow-1); |
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Kazi = 360*DEGREE * (Kcol + (.5 - x2)) / Knaz(Krow); |
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Kpol = DEGREE * (x1*Kpola(Krow) + (1-x1)*Kpola(Krow-1)); |
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sin_kpol = sin(Kpol); |
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Dx = -cos(Kazi)*sin_kpol; |
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Dy = sin(Kazi)*sin_kpol; |
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Dz = sqrt(1 - sin_kpol*sin_kpol); |
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Komega = 2*PI*if(Kbin-.5, |
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(cos(Kpola(Krow-1)*DEGREE) - cos(Kpola(Krow)*DEGREE))/Knaz(Krow), |
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1 - cos(Kpola(1)*DEGREE)); |
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'; |
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# Compute Klems bin from exiting ray direction |
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my $kcal = ' |
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DEGREE : PI/180; |
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Acos(x) : 1/DEGREE * if(x-1, 0, if(-1-x, 0, acos(x))); |
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posangle(a) : if(-a, a + 2*PI, a); |
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Atan2(y,x) : 1/DEGREE * posangle(atan2(y,x)); |
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kpola(r) : select(r, 5, 15, 25, 35, 45, 55, 65, 75, 90); |
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knaz(r) : select(r, 1, 8, 16, 20, 24, 24, 24, 16, 12); |
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kaccum(r) : if(r-.5, knaz(r) + kaccum(r-1), 0); |
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kfindrow(r, pol) : if(r-kpola(0)+.5, r, |
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if(pol-kpola(r), kfindrow(r+1, pol), r) ); |
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kazn(azi,inc) : if((360-.5*inc)-azi, floor((azi+.5*inc)/inc), 0); |
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kbin2(pol,azi) = select(kfindrow(1, pol), |
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kazn(azi,360/knaz(1)), |
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kaccum(1) + kazn(azi,360/knaz(2)), |
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kaccum(2) + kazn(azi,360/knaz(3)), |
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kaccum(3) + kazn(azi,360/knaz(4)), |
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kaccum(4) + kazn(azi,360/knaz(5)), |
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kaccum(5) + kazn(azi,360/knaz(6)), |
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kaccum(6) + kazn(azi,360/knaz(7)), |
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kaccum(7) + kazn(azi,360/knaz(8)), |
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kaccum(8) + kazn(azi,360/knaz(9)) |
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); |
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kbin = kbin2(Acos(Dz), Atan2(Dy, -Dx)); |
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'; |
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my $ndiv = 145; |
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my $nx = int(sqrt($nsamp*($dim[1]-$dim[0])/($dim[3]-$dim[2])) + .5); |
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my $ny = int($nsamp/$nx + .5); |
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$nsamp = $nx * $ny; |
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# Output XML prologue |
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print |
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'<?xml version="1.0" encoding="UTF-8"?> |
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<WindowElement xmlns="http://windows.lbl.gov" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://windows.lbl.gov/BSDF-v1.4.xsd"> |
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<WindowElementType>System</WindowElementType> |
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<Optical> |
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<Layer> |
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<Material> |
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<Name>Name</Name> |
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<Manufacturer>Manufacturer</Manufacturer> |
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'; |
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printf "\t\t\t<Thickness unit=\"Meter\">%.3f</Thickness>\n", $dim[5] - $dim[4]; |
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printf "\t\t\t<Width unit=\"Meter\">%.3f</Width>\n", $dim[1] - $dim[0]; |
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printf "\t\t\t<Height unit=\"Meter\">%.3f</Height>\n", $dim[3] - $dim[2]; |
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print "\t\t\t<DeviceType>Integral</DeviceType>\n"; |
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# Output MGF description if requested |
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if ( $geout ) { |
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print "\t\t\t<Geometry format=\"MGF\" unit=\"Meter\">\n"; |
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printf "xf -t %.6f %.6f 0\n", -($dim[0]+$dim[1])/2, -($dim[2]+$dim[3])/2; |
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system "cat $mgfscn"; |
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print "xf\n"; |
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print "\t\t\t</Geometry>\n"; |
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} |
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print ' </Material> |
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<DataDefinition> |
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<IncidentDataStructure>Columns</IncidentDataStructure> |
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<AngleBasis> |
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<AngleBasisName>LBNL/Klems Full</AngleBasisName> |
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<AngleBasisBlock> |
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<Theta>0</Theta> |
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<nPhis>1</nPhis> |
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<ThetaBounds> |
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<LowerTheta>0</LowerTheta> |
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<UpperTheta>5</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>10</Theta> |
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<nPhis>8</nPhis> |
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<ThetaBounds> |
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<LowerTheta>5</LowerTheta> |
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<UpperTheta>15</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>20</Theta> |
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<nPhis>16</nPhis> |
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<ThetaBounds> |
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<LowerTheta>15</LowerTheta> |
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<UpperTheta>25</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>30</Theta> |
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<nPhis>20</nPhis> |
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<ThetaBounds> |
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<LowerTheta>25</LowerTheta> |
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<UpperTheta>35</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>40</Theta> |
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<nPhis>24</nPhis> |
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<ThetaBounds> |
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<LowerTheta>35</LowerTheta> |
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<UpperTheta>45</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>50</Theta> |
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<nPhis>24</nPhis> |
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<ThetaBounds> |
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<LowerTheta>45</LowerTheta> |
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<UpperTheta>55</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>60</Theta> |
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<nPhis>24</nPhis> |
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<ThetaBounds> |
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<LowerTheta>55</LowerTheta> |
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<UpperTheta>65</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>70</Theta> |
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<nPhis>16</nPhis> |
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<ThetaBounds> |
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<LowerTheta>65</LowerTheta> |
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<UpperTheta>75</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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<AngleBasisBlock> |
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<Theta>82.5</Theta> |
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<nPhis>12</nPhis> |
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<ThetaBounds> |
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<LowerTheta>75</LowerTheta> |
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<UpperTheta>90</UpperTheta> |
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</ThetaBounds> |
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</AngleBasisBlock> |
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</AngleBasis> |
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</DataDefinition> |
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<WavelengthData> |
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<LayerNumber>System</LayerNumber> |
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<Wavelength unit="Integral">Visible</Wavelength> |
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<SourceSpectrum>CIE Illuminant D65 1nm.ssp</SourceSpectrum> |
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<DetectorSpectrum>ASTM E308 1931 Y.dsp</DetectorSpectrum> |
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<WavelengthDataBlock> |
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<WavelengthDataDirection>Transmission Front</WavelengthDataDirection> |
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<ColumnAngleBasis>LBNL/Klems Full</ColumnAngleBasis> |
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<RowAngleBasis>LBNL/Klems Full</RowAngleBasis> |
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<ScatteringDataType>BTDF</ScatteringDataType> |
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<ScatteringData> |
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'; |
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# Compute actual scattering data using rtcontrib |
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system "cnt $ndiv $ny $nx | rcalc -of -e '$tcal' " . |
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"-e 'xp=(\$3+rand(.35*recno-15))*(($dim[1]-$dim[0])/$nx)+$dim[0]' " . |
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"-e 'yp=(\$2+rand(.86*recno+11))*(($dim[3]-$dim[2])/$ny)+$dim[2]' " . |
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"-e 'zp:$dim[4]-1e-5' " . |
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q{-e 'Kbin=$1;x1=rand(1.21*recno+2.75);x2=rand(-3.55*recno-7.57)' } . |
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q{-e '$1=xp;$2=yp;$3=zp;$4=Dx;$5=Dy;$6=Dz' } . |
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"| rtcontrib -h -ff -n $nproc -c $nsamp -e '$kcal' -b kbin -bn $ndiv " . |
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"-m $modnm -w -ab 5 -ad 700 -lw 3e-6 $octree " . |
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"| rcalc -e 'x1:.5;x2:.5;$tcal' -e 'Kbin=floor((recno-1)/$ndiv)' " . |
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q{-if3 -e '$1=(0.265*$1+0.670*$2+0.065*$3)/(Komega*Dz)'}; |
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# Output XML epilogue |
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print |
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' </ScatteringData> |
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</WavelengthDataBlock> |
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</WavelengthData> |
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</Layer> |
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</Optical> |
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</WindowElement> |
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'; |
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# Clean up temporary files |
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system "rm -rf $td"; |
