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.\" RCSid $Id: genklemsamp.1,v 1.4 2010/09/03 23:53:49 greg Exp $
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.TH GENKLEMSAMP 1 6/13/09 RADIANCE
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.SH NAME
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genklemsamp - generate ray samples over surfaces using Klems BSDF basis
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.SH SYNOPSIS
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.B genklemsamp
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[
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.B "\-c N"
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][
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.B "\-f{a|f|d}"
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]
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[
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.B "view opts"
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]
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[
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.B "geom.rad .."
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]
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.SH DESCRIPTION
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.I Genklemsamp
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generates ray origins and directions to sample planar surfaces
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needed to determine incident radiances or daylight coefficients.
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This command is typically used in conjunction with
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.I rcontrib(1)
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to analyze exterior daylight coefficients
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for an annual simulation.
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.PP
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The view options are needed to specify (at minimum) the view direction,
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which corresponds to the orientation of the surfaces, and the view up
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vector, which corresponds to the azimuth=90-degree position on the Klems
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sampling hemisphere.
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The view fore clipping distance is also quite useful, as it provides
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a means to pass through some thickness in a fenestration system before
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samples are sent out.
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Other view options such as the view type and aft
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clipping distance are overridden or ignored.
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.PP
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If no Radiance scene files are provided, then the specified parallel
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view defines the width, height, center, and orientation of the window
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or facade of interest.
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If one or more scene files are given, they
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are presumed to contain planar surfaces over which
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.I genklemsamp
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will originate samples.
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The sampled surface normals must correspond to the specified
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view direction, and unaligned surfaces are silently ignored.
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.PP
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The
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.I \-c
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option specifies the number of rays to sample per Klems direction.
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These samples will be distributed evenly over the surface(s).
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The default setting is 1000.
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.PP
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The
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.I \-ff
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option specifies that output rays should be generated as 32-bit IEEE binary
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float values.
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This may be more efficient if passed directly to
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.I rcontrib
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or
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.I rtrace(1)
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with the same option.
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Likewise, the
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.I \-fd
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option specifies 64-bit IEEE binary double values.
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The default setting of
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.I \-fa
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produces ASCII floating point values.
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.SH EXAMPLE
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To generate 500 samples per direction over a set of south-facing windows and
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pass to
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.I rcontrib
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to compute daylight coefficients in a matrix:
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.IP "" .2i
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genklemsamp -c 500 -vd 0 -1 0 -vu 0 0 1 south_windows.rad
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| rcontrib -c 500 -e MF:1 -f reinhart.cal -b rbin -bn Nrbins exterior.oct > Dsouth.dat
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.SH AUTHOR
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Greg Ward
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.SH "SEE ALSO"
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dctimestep(1), genBSDF(1), genskyvec(1), mkillum(1),
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rcontrib(1), rtrace(1), vwrays(1)
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