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LEARN ABOUT MINIX
genskyvec
GENSKYVEC(1) General Commands Manual GENSKYVEC(1)
NAME
genskyvec - compute patch radiance averages for a specific sky
SYNOPSIS
genskyvec [ -m N ][ -c r g b ]
DESCRIPTION
Genskyvec samples the Radinace sky description given on the standard input to generate a list of average patch radiances. If there is a
sun in the description, genskyvec will include its contribution in the three nearest sky patches, distributing energy according to centroid
proximity.
By default, genskyvec divides the sky into 2305 patches, plus one patch for the ground. This corresponds to Reinhart's extension of the
Tregenza sky, where the original 145 patches are subdivided into 16 subpatches, except at the zenith. A different subdivision may be spec-
ified via the -m option. The value given will be used to subdivide each dimension, so the default of 4 yields almost 16 times as many
patches as the original Tregenza sky, which can be specified with -m 1. A higher resolution sky is generally better for daylight coeffi-
cient analysis where solar position is important.
The -c option may be used to specify a color for the sky. The gray value should equal 1 for proper energy balance The default sky color is
-c 0.960 1.004 1.118 .
EXAMPLE
To generate 578 patches corresponding to a 2x2 subdivision of the Tregenza sky on a sunny equinox noon:
gensky 9 21 12 | genskyvec -m 2 > sky09_21_12.dat
AUTHOR
Greg Ward
SEE ALSO
dctimestep(1), genBSDF(1), gensky(1), gentregvec(1), rtcontrib(1), rtrace(1)
RADIANCE
12/09/09 GENSKYVEC(1)
