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#!/bin/csh -f
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# RCSid: $Id: compamb.csh,v 3.6 2005/02/16 05:40:11 greg Exp $
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#
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# Compute best ambient value for a scene and append to rad input file
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#
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while ( $#argv > 1 )
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switch ( $argv[1] )
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case -e:
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set doexpos
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breaksw
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case -c:
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set docolor
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breaksw
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default:
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goto userr
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endsw
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shift argv
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end
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userr:
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if ( $#argv != 1 ) then
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echo Usage: $0 [-e][-c] rad_input_file
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exit 1
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endif
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onintr quit
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set td=`mktemp -d /tmp/ca.XXXXXX`
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set tf=$td/compamb
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set oct=`rad -w -s -e -v 0 $argv[1] QUA=High AMB=$tf.amb OPT=$tf.opt | sed -n 's/^OCTREE= //p'`
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rad -n -s -V $argv[1] \
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| rpict @$tf.opt -av 0 0 0 -aw 16 -dv- -S 1 -x 16 -y 16 -ps 1 $oct \
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| ra_rgbe - '\!pvalue -h -H -d' > $tf.dat
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echo \# Rad input file modified by $0 `date` >> $argv[1]
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if ( $?doexpos ) then
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(echo -n 'EXPOSURE= '; \
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total -u $tf.dat | rcalc -e '$1=2/(.265*$1+.670*$2+.065*$3)') \
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>> $argv[1]
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endif
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lookamb -h -d $tf.amb | rcalc -e '$1=$10;$2=$11;$3=$12' >> $tf.dat
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set lavg=`rcalc -e '$1=lum;lum=.265*$1+.670*$2+.065*$3;cond=lum-1e-5' $tf.dat | total -m -p`
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if ( $?docolor ) then
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set cavg=(`total -m $tf.dat`)
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set av=(`rcalc -n -e "r=$cavg[1];g=$cavg[2];b=$cavg[3];sf=$lavg/(.265*r+.670*g+.065*b)" -e '$1=sf*r;$2=sf*g;$3=sf*b'`)
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else
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set av=($lavg $lavg $lavg)
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endif
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echo "render= -av $av" >> $argv[1]
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quit:
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exec rm -r $td
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