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.\" RCSid $Id$"
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.TH DCTIMESTEP 1 12/09/09 RADIANCE
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.SH NAME
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dctimestep - compute annual simulation time-step via matrix multiplication
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.SH SYNOPSIS
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.B dctimestep
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.B Vspec
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.B Tbsdf.xml
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.B Dmat.dat
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[
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.B tregvec
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]
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.SH DESCRIPTION
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.I Dctimestep
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takes four input files, forming a matrix expression.
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The first argument is the View matrix file that specifies how window output
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directions are related to some set of measured values, such as an array of
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illuminance points or images.
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This matrix is usually computed by
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.I rtcontrib(1)
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for a particular set of windows or skylight openings.
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The second argument is the window transmission matrix, or BSDF, given as
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a standard XML description.
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The third argument is the Daylight matrix file that defines how sky patches
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relate to input directions on the same opening.
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This is usually computed using
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.I genklemsamp(1)
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with
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.I rtcontrib
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in a separate run for each window or skylight orientation.
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The final input is the sky contribution vector,
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usually computed by
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.I genskyvec(1),
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which may be passed on the standard input.
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This data must be in ASCII format, whereas the View and Daylight matrices
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are more efficiently represented as binary float data if machine
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byte-order is not an issue.
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.PP
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Sent to the standard output of
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.I dctimestep
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is either an ASCII color vector with as many RGB triplets
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as there are rows in the View matrix, or a combined
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.I Radiance
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picture.
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Which output is produced depends on the
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.I Vspec
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argument.
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A regular file name will be loaded and interpreted as a matrix to
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generate a color results vector.
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A file specification containing a '%d' format string will be
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interpreted as a list of
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.I Radiance
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component pictures, which will be summed according to the computed
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vector.
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.SH EXAMPLES
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To compute a set of illuminance contributions for Window 1 on
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the Winter solstice at 2pm:
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.IP "" .2i
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gensky 12 21 14 | genskyvec | dctimestep IllPts.vmx Blinds20.xml Window1.dmx > Ill_12-21-14.dat
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.PP
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To compute Window2's contribution to an interior view at 12 noon on the Summer solstice:
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.IP "" .2i
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gensky 6 21 12 | genskyvec | dctimestep view%03d.hdr Blinds30.xml Window2.dmx > view_6-21-12.hdr
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.SH AUTHOR
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Greg Ward
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.SH "SEE ALSO"
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genklemsamp(1), genskyvec(1), mkillum(1), rtcontrib(1), rtrace(1), vwrays(1)
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