10-20-2014
Use the "surfaces" line as an example to implement your own solution.
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LEARN ABOUT MINIX
genklemsamp
GENKLEMSAMP(1) General Commands Manual GENKLEMSAMP(1)
NAME
genklemsamp - generate ray samples over surfaces using Klems BSDF basis
SYNOPSIS
genklemsamp [ -c N ][ -f{a|f|d} ] [ view opts ] [ geom.rad .. ]
DESCRIPTION
Genklemsamp generates ray origins and directions to sample planar surfaces needed to determine incident radiances or daylight coefficients.
This command is typically used in conjunction with rtcontrib(1) to analyze exterior daylight coefficients for an annual simulation.
The view options are needed to specify (at minimum) the view direction, which corresponds to the orientation of the surfaces, and the view
up vector, which corresponds to the azimuth=90-degree position on the Klems sampling hemisphere. The view fore clipping distance is also
quite useful, as it provides a means to pass through some thickness in a fenestration system before samples are sent out. Other view
options such as the view type and aft clipping distance are overridden or ignored.
If no Radiance scene files are provided, then the specified parallel view defines the width, height, center, and orientation of the window
or facade of interest. If one or more scene files are given, they are presumed to contain planar surfaces over which genklemsamp will
originate samples. The sampled surface normals must correspond to the specified view direction, and unaligned surfaces are silently
ignored.
The -c option specifies the number of rays to sample per Klems direction. These samples will be distributed evenly over the surface(s).
The default setting is 1000.
The -ff option specifies that output rays should be generated as 32-bit IEEE binary float values. This may be more efficient if passed
directly to rtcontrib or rtrace(1) with the same option. Likewise, the -fd option specifies 64-bit IEEE binary double values. The default
setting of -fa produces ASCII floating point values.
EXAMPLE
To generate 500 samples per direction over a set of south-facing windows and pass to rtcontrib to compute daylight coefficients in a
matrix:
genklemsamp -c 500 -vd 0 -1 0 -vu 0 0 1 south_windows.rad | rtcontrib -c 500 -e MF:1 -f reinhart.cal -b rbin -bn Nrbins exterior.oct >
Dsouth.dat
AUTHOR
Greg Ward
SEE ALSO
dctimestep(1), genBSDF(1), genskyvec(1), mkillum(1), rtcontrib(1), rtrace(1), vwrays(1)
RADIANCE
6/13/09 GENKLEMSAMP(1)