man/man1/dctimestep.1

.\" RCSid $Id: dctimestep.1,v 1.7 2013/09/05 17:53:22 greg Exp $"
.TH DCTIMESTEP 1 12/09/09 RADIANCE
.SH NAME
dctimestep - compute annual simulation time-step(s) via matrix multiplication
.SH SYNOPSIS
.B dctimestep
[
.B "\-n nsteps"
][
.B "\-o ospec"
][
.B "\-i{f|d}
][
.B "\-o{f|d}
]
.B DCspec
[
.B skyf
]
.br
.B dctimestep
[
.B "\-n nsteps"
][
.B "\-o ospec"
][
.B "\-i{f|d}
][
.B "\-o{f|d}
]
.B Vspec
.B Tbsdf.xml
.B Dmat.dat
[
.B skyf
]
.SH DESCRIPTION
.I Dctimestep
has two invocation forms.
In the first form,
.I dctimestep
is given a daylight coefficient specification and an optional sky
vector or matrix, which may be read from the standard input if unspecified.
The daylight coefficients are multiplied against these sky values
and the results are written to the standard output.
This may be a list of color values or a combined Radiance image,
as explained below.
.PP
In the second form,
.I dctimestep
takes four input files, forming a matrix expression.
The first argument is the View matrix file that specifies how window output
directions are related to some set of measured values, such as an array of
illuminance points or images.
This matrix is usually computed by
.I rcontrib(1)
for a particular set of windows or skylight openings.
The second argument is the window transmission matrix, or BSDF, given as
a standard XML description.
The third argument is the Daylight matrix file that defines how sky patches
relate to input directions on the same opening.
This is usually computed using
.I genklemsamp(1)
with
.I rcontrib
in a separate run for each window or skylight orientation.
The last file is the sky contribution vector or matrix,
typically computed by
.I genskyvec(1)
or
.I gendaymtx(1),
and may be passed on the standard input.
This data is assumed by default to be in ASCII format, whereas the
formats of the View and Daylight matrices
are detected automatically if given as binary data.
The
.I \-if
or
.I \-id
option may be used to specify that sky data is in float or double
format, respectively, which is more efficient for large matrices.
(Note that binary double data may not be read from stdin.)\0
.PP
Sent to the standard output of
.I dctimestep
is either a color vector with as many RGB triplets
as there are rows in the View matrix, or a combined
.I Radiance
picture.
Which output is produced depends on the first argument.
A regular file name will be loaded and interpreted as a matrix to
generate a color results vector.
A file specification containing a '%d' format string will be
interpreted as a list of
.I Radiance
component pictures, which will be summed according to the computed
vector.
.PP
The
.I \-n
option may be used to compute multiple time steps in a
single invocation.
The sky input file must contain the number of
columns specified in each sky patch row, whether it is read
from the standard input or from a file.
The columns do not need to be given on the same
line, so long as the number of values totals 3*Nsteps*Npatches.
Input starts from the first patch at the first time step, then the
first patch at the second time step, and so on.
.PP
The
.I \-o
option may be used to specify a file or a set of output files
to use rather than the standard output.
If the given specification contains a '%d' format string, this
will be replaced by the time step index, starting from 1.
In this way, multiple output pictures may be produced,
or separate result vectors (one per time step).
If the standard output is used or the
.I \-o
option specifies a single output file, then an information header
will precede the output.
This can be removed if desired using the
.I getinfo\(1\)
command with a single hyphen ('-') argument.
.PP
The
.I \-of
or
.I \-od
option may be used to specify IEEE float or double binary output
data, respectively.
This enables
.I dctimestep
to be used as a pure matrix multiplier, as the output file with
header specifying the format is suitable for subsequent calls.
.SH EXAMPLES
To compute workplane illuminances at 3:30pm on Feb 10th:
.IP "" .2i
gensky 2 10 15:30 | genskyvec | dctimestep workplaneDC.dmx > Ill_02-10-1530.dat
.PP
To compute an image at 10am on the equinox from a set of component images:
.IP "" .2i
gensky 3 21 10 | genskyvec | dctimestep dcomp%03d.hdr > view_03-21-10.hdr
.PP
To compute a set of illuminance contributions for Window 1 on
the Winter solstice at 2pm:
.IP "" .2i
gensky 12 21 14 | genskyvec | dctimestep IllPts.vmx Blinds20.xml Window1.dmx > Ill_12-21-14.dat
.PP
To compute Window2's contribution to an interior view at 12 noon on the Summer solstice:
.IP "" .2i
gensky 6 21 12 | genskyvec | dctimestep view%03d.hdr Blinds30.xml
Window2.dmx > view_6-21-12.hdr
.PP
To generate an hourly matrix of sensor value contributions from Skylight3
using a 3-phase calculation, where output columns are time steps:
.IP "" .2i
gendaymtx -of Tampa.wea | dctimestep -if -n 8760 WPpts.vmx
shade3.xml Skylight3.dmx > wp_win3.dat
.IP "" .2i
.PP
Generate a series of pictures corresponding to timesteps
in an annual simulation:
.IP "" .2i
gendaymtx NYCity.wea | dctimestep -n 8760 -o tstep%04d.hdr dcomp%03d.hdr
.PP
To multiply two color matrices (second matrix is IEEE-float with
145 RGB columns) into a IEEE-double result (also 145 RGB columns):
.IP "" .2i
getinfo - < Inp2.fmx | dctimestep -n 145 -if -od Inp1.fmx > Inp1xInp2.dmx
.SH AUTHOR
Greg Ward
.SH "SEE ALSO"
gendaymtx(1), genklemsamp(1), genskyvec(1), getinfo(1),
mkillum(1), rcollate(1), rcontrib(1), rtrace(1), vwrays(1)
Revision:	1.8
Committed:	Sat Feb 8 01:28:05 2014 UTC (11 years, 2 months ago) by greg
Branch:	MAIN
Changes since 1.7:	+30 -3 lines
Log Message:	Added -od and -of options for binary output
#	User	Rev	Content
1	greg	1.8	.\" RCSid $Id: dctimestep.1,v 1.7 2013/09/05 17:53:22 greg Exp $"
2	greg	1.1	.TH DCTIMESTEP 1 12/09/09 RADIANCE
3			.SH NAME
4	greg	1.4	dctimestep - compute annual simulation time-step(s) via matrix multiplication
5	greg	1.1	.SH SYNOPSIS
6			.B dctimestep
7	greg	1.4	[
8			.B "\-n nsteps"
9			][
10			.B "\-o ospec"
11	greg	1.5	][
12			.B "\-i{f\|d}
13	greg	1.8	][
14			.B "\-o{f\|d}
15	greg	1.4	]
16	greg	1.2	.B DCspec
17			[
18	greg	1.4	.B skyf
19	greg	1.2	]
20			.br
21			.B dctimestep
22	greg	1.4	[
23			.B "\-n nsteps"
24			][
25			.B "\-o ospec"
26	greg	1.5	][
27			.B "\-i{f\|d}
28	greg	1.8	][
29			.B "\-o{f\|d}
30	greg	1.4	]
31	greg	1.1	.B Vspec
32			.B Tbsdf.xml
33			.B Dmat.dat
34			[
35	greg	1.4	.B skyf
36	greg	1.1	]
37			.SH DESCRIPTION
38			.I Dctimestep
39	greg	1.2	has two invocation forms.
40			In the first form,
41			.I dctimestep
42			is given a daylight coefficient specification and an optional sky
43	greg	1.4	vector or matrix, which may be read from the standard input if unspecified.
44			The daylight coefficients are multiplied against these sky values
45			and the results are written to the standard output.
46	greg	1.2	This may be a list of color values or a combined Radiance image,
47			as explained below.
48			.PP
49			In the second form,
50			.I dctimestep
51	greg	1.1	takes four input files, forming a matrix expression.
52			The first argument is the View matrix file that specifies how window output
53			directions are related to some set of measured values, such as an array of
54			illuminance points or images.
55			This matrix is usually computed by
56	greg	1.3	.I rcontrib(1)
57	greg	1.1	for a particular set of windows or skylight openings.
58			The second argument is the window transmission matrix, or BSDF, given as
59			a standard XML description.
60			The third argument is the Daylight matrix file that defines how sky patches
61			relate to input directions on the same opening.
62			This is usually computed using
63			.I genklemsamp(1)
64			with
65	greg	1.3	.I rcontrib
66	greg	1.1	in a separate run for each window or skylight orientation.
67	greg	1.6	The last file is the sky contribution vector or matrix,
68			typically computed by
69			.I genskyvec(1)
70			or
71			.I gendaymtx(1),
72			and may be passed on the standard input.
73			This data is assumed by default to be in ASCII format, whereas the
74			formats of the View and Daylight matrices
75			are detected automatically if given as binary data.
76	greg	1.5	The
77			.I \-if
78			or
79			.I \-id
80			option may be used to specify that sky data is in float or double
81	greg	1.6	format, respectively, which is more efficient for large matrices.
82	greg	1.5	(Note that binary double data may not be read from stdin.)\0
83	greg	1.1	.PP
84			Sent to the standard output of
85			.I dctimestep
86	greg	1.8	is either a color vector with as many RGB triplets
87	greg	1.1	as there are rows in the View matrix, or a combined
88			.I Radiance
89			picture.
90	greg	1.2	Which output is produced depends on the first argument.
91	greg	1.1	A regular file name will be loaded and interpreted as a matrix to
92			generate a color results vector.
93			A file specification containing a '%d' format string will be
94			interpreted as a list of
95			.I Radiance
96			component pictures, which will be summed according to the computed
97			vector.
98	greg	1.4	.PP
99			The
100			.I \-n
101			option may be used to compute multiple time steps in a
102			single invocation.
103			The sky input file must contain the number of
104			columns specified in each sky patch row, whether it is read
105	greg	1.6	from the standard input or from a file.
106	greg	1.4	The columns do not need to be given on the same
107			line, so long as the number of values totals 3NstepsNpatches.
108			Input starts from the first patch at the first time step, then the
109			first patch at the second time step, and so on.
110			.PP
111			The
112			.I \-o
113			option may be used to specify a file or a set of output files
114			to use rather than the standard output.
115			If the given specification contains a '%d' format string, this
116			will be replaced by the time step index, starting from 1.
117			In this way, multiple output pictures may be produced,
118	greg	1.6	or separate result vectors (one per time step).
119	greg	1.8	If the standard output is used or the
120			.I \-o
121			option specifies a single output file, then an information header
122			will precede the output.
123			This can be removed if desired using the
124			.I getinfo\(1\)
125			command with a single hyphen ('-') argument.
126			.PP
127			The
128			.I \-of
129			or
130			.I \-od
131			option may be used to specify IEEE float or double binary output
132			data, respectively.
133			This enables
134			.I dctimestep
135			to be used as a pure matrix multiplier, as the output file with
136			header specifying the format is suitable for subsequent calls.
137	greg	1.1	.SH EXAMPLES
138	greg	1.2	To compute workplane illuminances at 3:30pm on Feb 10th:
139			.IP "" .2i
140			gensky 2 10 15:30 \| genskyvec \| dctimestep workplaneDC.dmx > Ill_02-10-1530.dat
141			.PP
142			To compute an image at 10am on the equinox from a set of component images:
143			.IP "" .2i
144	greg	1.6	gensky 3 21 10 \| genskyvec \| dctimestep dcomp%03d.hdr > view_03-21-10.hdr
145	greg	1.2	.PP
146	greg	1.1	To compute a set of illuminance contributions for Window 1 on
147			the Winter solstice at 2pm:
148			.IP "" .2i
149			gensky 12 21 14 \| genskyvec \| dctimestep IllPts.vmx Blinds20.xml Window1.dmx > Ill_12-21-14.dat
150			.PP
151			To compute Window2's contribution to an interior view at 12 noon on the Summer solstice:
152			.IP "" .2i
153	greg	1.6	gensky 6 21 12 \| genskyvec \| dctimestep view%03d.hdr Blinds30.xml
154			Window2.dmx > view_6-21-12.hdr
155			.PP
156			To generate an hourly matrix of sensor value contributions from Skylight3
157			using a 3-phase calculation, where output columns are time steps:
158			.IP "" .2i
159			gendaymtx -of Tampa.wea \| dctimestep -if -n 8760 WPpts.vmx
160			shade3.xml Skylight3.dmx > wp_win3.dat
161			.IP "" .2i
162			.PP
163			Generate a series of pictures corresponding to timesteps
164			in an annual simulation:
165			.IP "" .2i
166			gendaymtx NYCity.wea \| dctimestep -n 8760 -o tstep%04d.hdr dcomp%03d.hdr
167	greg	1.8	.PP
168			To multiply two color matrices (second matrix is IEEE-float with
169			145 RGB columns) into a IEEE-double result (also 145 RGB columns):
170			.IP "" .2i
171			getinfo - < Inp2.fmx \| dctimestep -n 145 -if -od Inp1.fmx > Inp1xInp2.dmx
172	greg	1.1	.SH AUTHOR
173			Greg Ward
174			.SH "SEE ALSO"
175	greg	1.8	gendaymtx(1), genklemsamp(1), genskyvec(1), getinfo(1),
176	greg	1.7	mkillum(1), rcollate(1), rcontrib(1), rtrace(1), vwrays(1)