RSENSOR(1)
NAME
rsensor - compute sensor signal from a RADIANCE scene
SYNOPSIS
rsensor [ -n nprocs ][ -h ][ render options ] [ $EVAR ] [ @file ] { [
-rd nrays ][ -dn nsrc ][ sensor_view ] sensor_file .. } octree
rsensor [ options ] -defaults
DESCRIPTION
Rsensor traces rays outward from one or more specified illumination
sensors into the RADIANCE scene given by octree, sending the computed
sensor value to the standard output. (The octree may be given as the
output of a command enclosed in quotes and preceded by a `!'.) In the
second form, the default values for the options (modified by those
options present) are printed with a brief explanation.
Options may be given on the command line and/or read from the environment and/or read from a file. A command argument beginning with a dollar sign ('$') is immediately replaced by the contents of the given
environment variable. A command argument beginning with an at sign
('@') is immediately replaced by the contents of the given file.
- The sensor files themselves will be searched for in the path locations
specified by the RAYPATH environment variable, similar to other types
of Radiance auxiliary files. If the sensor file path begins with '/',
'.' or '~', no search will take place. Before each sensor file, a separate view may be specified. In this case, the view origin and direction will correspond to the position and orientation of the sensor, and
the view up vector will determine the zero azimuthal direction of the
sensor. The fore clipping distance may be used as well, but other view
options will be ignored. (See rpict(1) for details on how to specify a
view.) The actual data contained in the sensor file corresponds to the
SPOT tab-separated matrix specification, where the column header has
"degrees" in the leftmost column, followed by evenly-spaced azimuthal
angles. Each row begins with the polar angle, and is followed by the
relative sensitivity values for each direction. A low-resolution example of a sensor file is given below:
- degrees 0 90 180 270
0 .02 .04 .02 .04
45 .01 .02 .01 .02
90 .001 .002 .001 .002 - As well as different views, the number of samples may be changed between sensors, where the -rd option controls the number of ray samples sent at random, and the -dn option controls the number of rays sent to each light source per sensor.
- The -h option toggles header output, which defaults to "on." The -n option may be used to specify multiple calculation processes on systems with more than one CPU. For additional options, consult the rtrace(1) man page. The final octree argument must be given, as the octree cannot be read from the standard input.
EXAMPLES
- To compute values for the same sensor with two different positions:
- rsensor -ab 2 -vf posA.vf mysens.dat -vf posB.vf mysens.dat scene.oct
ENVIRONMENT
RAYPATH the directories to check for auxiliary files.
AUTHOR
Greg Ward for Architectural Energy Corporation