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genklemsamp - generate ray samples over surfaces using Klems BSDF basis


genklemsamp [ -c N ][ -f{a|f|d} ] [ view opts ] [ geom.rad .. ]


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

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.


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

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