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/usr/bin/rlux is in radiance 4R1+20120125-1.1.

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#!/bin/csh -f
# RCSid: $Id: rlux.csh,v 2.5 2003/02/22 02:07:30 greg Exp $
#
# Compute illuminance from ray origin and direction
#
if ( $#argv < 1 ) then
	echo "Usage: $0 [rtrace args] octree"
	exit 1
endif
rtrace -i+ -dv- -h- -x 1 $argv[*]:q | rcalc -e '$1=47.4*$1+120*$2+11.6*$3' -u