--- ray/src/util/genBSDF.pl	2011/08/24 04:14:58	2.25
+++ ray/src/util/genBSDF.pl	2011/11/21 20:07:50	2.28
@@ -1,5 +1,5 @@
 #!/usr/bin/perl -w
-# RCSid $Id: genBSDF.pl,v 2.25 2011/08/24 04:14:58 greg Exp $
+# RCSid $Id: genBSDF.pl,v 2.28 2011/11/21 20:07:50 greg Exp $
 #
 # Compute BSDF based on geometry and material description
 #
@@ -23,6 +23,7 @@ my $geout = 1;
 my $nproc = 1;
 my $doforw = 0;
 my $doback = 1;
+my $pctcull = 95;
 my $gunit = "Meter";
 my @dim;
 # Get options
@@ -43,6 +44,9 @@ while ($#ARGV >= 0) {
 		$doforw = ("$ARGV[0]" =~ /^\+/);
 	} elsif ("$ARGV[0]" =~ /^[-+]b/) {
 		$doback = ("$ARGV[0]" =~ /^\+/);
+	} elsif ("$ARGV[0]" eq "-t") {
+		$pctcull = $ARGV[1];
+		shift @ARGV;
 	} elsif ("$ARGV[0]" =~ /^-t[34]$/) {
 		$tensortree = substr($ARGV[0], 2, 1);
 		$ttlog2 = $ARGV[1];
@@ -149,18 +153,22 @@ print
 </WindowElement>
 ';
 # Clean up temporary files and exit
-if ( $persistfile && open(PFI, "< $persistfile") ) {
-	while (<PFI>) {
-		s/^[^ ]* //;
-		kill('ALRM', $_);
-		last;
-	}
-	close PFI;
-}
 exec("rm -rf $td");
 
 #-------------- End of main program segment --------------#
 
+#++++++++++++++ Kill persistent rtrace +++++++++++++++++++#
+sub persist_end {
+	if ( $persistfile && open(PFI, "< $persistfile") ) {
+		while (<PFI>) {
+			s/^[^ ]* //;
+			kill('ALRM', $_);
+			last;
+		}
+		close PFI;
+	}
+}
+
 #++++++++++++++ Tensor tree BSDF generation ++++++++++++++#
 sub do_tree_bsdf {
 # Get sampling rate and subdivide task
@@ -236,6 +244,7 @@ if ( $doback ) {
 		die "rtcontrib process reported error" if ( $? );
 		$npleft++;
 	}
+	persist_end();
 	ttree_out(0);
 }
 if ( $doforw ) {
@@ -252,6 +261,7 @@ if ( $doforw ) {
 		die "rtcontrib process reported error" if ( $? );
 		$npleft++;
 	}
+	persist_end();
 	ttree_out(1);
 }
 }	# end of sub do_tree_bsdf()
@@ -328,7 +338,7 @@ print
 system "rcalc -if3 -e 'Omega:PI/($ns*$ns)' " .
 	q{-e '$1=(0.265*$1+0.670*$2+0.065*$3)/Omega' -of } .
 	"$td/" . ($bmodnm,$fmodnm)[$forw] . "_???.flt " .
-	"| rttree_reduce -h -ff -r $tensortree -g $ttlog2";
+	"| rttree_reduce -a -h -ff -t $pctcull -r $tensortree -g $ttlog2";
 die "Failure running rttree_reduce" if ( $? );
 print
 '			</ScatteringData>
@@ -354,7 +364,7 @@ print
 system "rcalc -if3 -e 'Omega:PI/($ns*$ns)' " .
 	q{-e '$1=(0.265*$1+0.670*$2+0.065*$3)/Omega' -of } .
 	"$td/" . ($fmodnm,$bmodnm)[$forw] . "_???.flt " .
-	"| rttree_reduce -h -ff -r $tensortree -g $ttlog2";
+	"| rttree_reduce -a -h -ff -t $pctcull -r $tensortree -g $ttlog2";
 die "Failure running rttree_reduce" if ( $? );
 print
 '			</ScatteringData>
@@ -575,10 +585,10 @@ print
 			<ScatteringDataType>BRDF</ScatteringDataType>
 			<ScatteringData>
 ';
-# Output front reflection (transposed order)
+# Output front reflection (reciprocity averaging)
 for (my $od = 0; $od < $ndiv; $od++) {
 	for (my $id = 0; $id < $ndiv; $id++) {
-		print $rfarr[$ndiv*$id + $od];
+		print .5*($rfarr[$ndiv*$id + $od] + $rfarr[$ndiv*$od + $id]);
 	}
 	print "\n";
 }
@@ -625,10 +635,10 @@ print
 			<ScatteringDataType>BRDF</ScatteringDataType>
 			<ScatteringData>
 ';
-# Output back reflection (transposed order)
+# Output back reflection (reciprocity averaging)
 for (my $od = 0; $od < $ndiv; $od++) {
 	for (my $id = 0; $id < $ndiv; $id++) {
-		print $rbarr[$ndiv*$id + $od];
+		print .5*($rbarr[$ndiv*$id + $od] + $rbarr[$ndiv*$od + $id]);
 	}
 	print "\n";
 }