1 #!/bin/csh -f

     2 # RCSid: $Id: pdfblur.csh,v 2.6 2005/01/18 01:37:43 greg Exp $

     3 #

     4 # Generate views for depth-of-field blurring on picture

     5 #

     6 if ($#argv != 3) then

     7 	echo "Usage: $0 aperture nsamp viewfile"

     8 	exit 1

     9 endif

    10 set a = "$1"

    11 set n = "$2"

    12 set vf = "$3"

    13 cnt $n | rcalc -e `vwright i < $vf` \

    14 -e "M:$n/5+1;a:$a/2;N:$n;" -e 'tmax:PI*a*(M+1)' \

    15 -e 't=tmax/N*($1+rand($1))' \

    16 -e 'theta=2*M*PI/(M-1)*(M-sqrt(M*M-(M-1)/(PI*a)*t))' \

    17 -e 'r=a*(1-(M-1)/(2*M*M*PI)*theta)' \

    18 -e 'rcost=r*cos(theta);rsint=r*sin(theta)' \

    19 -e 'opx=ipx+rcost*ihx+rsint*ivx' \

    20 -e 'opy=ipy+rcost*ihy+rsint*ivy' \

    21 -e 'opz=ipz+rcost*ihz+rsint*ivz' \

    22 -e 'os=is-rcost/(id*ihn);ol=il-rsint/(id*ivn)' \

    23 -o 'VIEW= -vp ${opx} ${opy} ${opz} -vs ${os} -vl ${ol}'