man/man1/dctimestep.1

.\" RCSid $Id: dctimestep.1,v 1.15 2019/03/01 01:00:03 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 "\-h"
][
.B "\-o ospec"
][
.B "\-i{f|d}
][
.B "\-o{f|d|c}
]
.B DCspec
[
.B skyf
]
.br
.B dctimestep
[
.B "\-n nsteps"
][
.B "\-h"
][
.B "\-o ospec"
][
.B "\-i{f|d}
][
.B "\-o{f|d}
]
.B Vspec
.B Tbsdf
.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 rfluxmtx(1)
or
.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 matrix or 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 rfluxmtx
with separate runs 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.
.PP
If the input sky data lacks a header, the
.I \-n
option may be used to indicate the number of time steps, which
will be 1 for a sky vector.
The sky input file must otherwise contain the number of
columns (time steps) specified in each sky patch row,
whether it is read from the standard input or from a file.
Input starts from the first patch at the first time step, then the
first patch at the second time step, and so on.
Note that all matrix elements are RGB triplets, so the actual size
of the sky vector or matrix is three times the number of steps times
the number of sky patches.
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.
These options are unnecessary when the sky input includes a header.
.PP
Any of the matrix or vector files may be read from a command
instead of a file by
using quotes and a beginning exclamation point ('!').
.PP
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 \-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 0.
In this way, multiple output pictures may be produced,
or separate result vectors (one per time step).
.PP
A header will normally be produced on the output, unless the
.I \-h
option is specified.
The
.I \-of,
.I \-od,
or
.I \-oc
option may be used to specify IEEE float, double, or RGBE (picture) output
data, respectively.
.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 WPpts.vmx
shade3.xml Skylight3.dmx > wp_win3.dat
.PP
Generate a series of pictures corresponding to timesteps
in an annual simulation:
.IP "" .2i
gendaymtx NYCity.wea | dctimestep -o tstep%04d.hdr dcomp%03d.hdr
.PP
To multiply an irradiance view matrix through a pair of XML window layers using
a given exterior daylight matrix and sky vector:
.IP "" .2i
dctimestep Illum.vmx "!rmtxop -ff Blinds1.xml Windo1.xml" Exter.dmx Jan20.sky
.PP
To multiply two matrices into a IEEE-float result with header:
.IP "" .2i
dctimestep -of Inp1.fmx Inp2.fmx > Inp1xInp2.fmx
.SH AUTHOR
Greg Ward
.SH "SEE ALSO"
gendaymtx(1), genskyvec(1), getinfo(1),
mkillum(1), rcollate(1), rcontrib(1),
rfluxmtx(1), rmtxop(1), rtrace(1), vwrays(1)
Revision:	1.16
Committed:	Wed Oct 23 17:00:14 2019 UTC (5 years, 6 months ago) by greg
Branch:	MAIN
CVS Tags:	rad5R3
Changes since 1.15:	+6 -5 lines
Log Message:	Added support for RGBE picture i/o to dctimestep
#	Content
1	.\" RCSid $Id: dctimestep.1,v 1.15 2019/03/01 01:00:03 greg Exp $"
2	.TH DCTIMESTEP 1 12/09/09 RADIANCE
3	.SH NAME
4	dctimestep - compute annual simulation time-step(s) via matrix multiplication
5	.SH SYNOPSIS
6	.B dctimestep
7	[
8	.B "\-n nsteps"
9	][
10	.B "\-h"
11	][
12	.B "\-o ospec"
13	][
14	.B "\-i{f\|d}
15	][
16	.B "\-o{f\|d\|c}
17	]
18	.B DCspec
19	[
20	.B skyf
21	]
22	.br
23	.B dctimestep
24	[
25	.B "\-n nsteps"
26	][
27	.B "\-h"
28	][
29	.B "\-o ospec"
30	][
31	.B "\-i{f\|d}
32	][
33	.B "\-o{f\|d}
34	]
35	.B Vspec
36	.B Tbsdf
37	.B Dmat.dat
38	[
39	.B skyf
40	]
41	.SH DESCRIPTION
42	.I Dctimestep
43	has two invocation forms.
44	In the first form,
45	.I dctimestep
46	is given a daylight coefficient specification and an optional sky
47	vector or matrix, which may be read from the standard input if unspecified.
48	The daylight coefficients are multiplied against these sky values
49	and the results are written to the standard output.
50	This may be a list of color values or a combined Radiance image,
51	as explained below.
52	.PP
53	In the second form,
54	.I dctimestep
55	takes four input files, forming a matrix expression.
56	The first argument is the View matrix file that specifies how window output
57	directions are related to some set of measured values, such as an array of
58	illuminance points or images.
59	This matrix is usually computed by
60	.I rfluxmtx(1)
61	or
62	.I rcontrib(1)
63	for a particular set of windows or skylight openings.
64	The second argument is the window transmission matrix, or BSDF, given as
65	a matrix or a standard XML description.
66	The third argument is the Daylight matrix file that defines how sky patches
67	relate to input directions on the same opening.
68	This is usually computed using
69	.I rfluxmtx
70	with separate runs for each window or skylight orientation.
71	The last file is the sky contribution vector or matrix,
72	typically computed by
73	.I genskyvec(1)
74	or
75	.I gendaymtx(1),
76	and may be passed on the standard input.
77	.PP
78	If the input sky data lacks a header, the
79	.I \-n
80	option may be used to indicate the number of time steps, which
81	will be 1 for a sky vector.
82	The sky input file must otherwise contain the number of
83	columns (time steps) specified in each sky patch row,
84	whether it is read from the standard input or from a file.
85	Input starts from the first patch at the first time step, then the
86	first patch at the second time step, and so on.
87	Note that all matrix elements are RGB triplets, so the actual size
88	of the sky vector or matrix is three times the number of steps times
89	the number of sky patches.
90	The
91	.I \-if
92	or
93	.I \-id
94	option may be used to specify that sky data is in float or double
95	format, respectively, which is more efficient for large matrices.
96	These options are unnecessary when the sky input includes a header.
97	.PP
98	Any of the matrix or vector files may be read from a command
99	instead of a file by
100	using quotes and a beginning exclamation point ('!').
101	.PP
102	The standard output of
103	.I dctimestep
104	is either a color vector with as many RGB triplets
105	as there are rows in the View matrix, or a combined
106	.I Radiance
107	picture.
108	Which output is produced depends on the first argument.
109	A regular file name will be loaded and interpreted as a matrix to
110	generate a color results vector.
111	A file specification containing a '%d' format string will be
112	interpreted as a list of
113	.I Radiance
114	component pictures, which will be summed according to the computed
115	vector.
116	.PP
117	The
118	.I \-o
119	option may be used to specify a file or a set of output files
120	to use rather than the standard output.
121	If the given specification contains a '%d' format string, this
122	will be replaced by the time step index, starting from 0.
123	In this way, multiple output pictures may be produced,
124	or separate result vectors (one per time step).
125	.PP
126	A header will normally be produced on the output, unless the
127	.I \-h
128	option is specified.
129	The
130	.I \-of,
131	.I \-od,
132	or
133	.I \-oc
134	option may be used to specify IEEE float, double, or RGBE (picture) output
135	data, respectively.
136	.SH EXAMPLES
137	To compute workplane illuminances at 3:30pm on Feb 10th:
138	.IP "" .2i
139	gensky 2 10 15:30 \| genskyvec \| dctimestep workplaneDC.dmx > Ill_02-10-1530.dat
140	.PP
141	To compute an image at 10am on the equinox from a set of component images:
142	.IP "" .2i
143	gensky 3 21 10 \| genskyvec \| dctimestep dcomp%03d.hdr > view_03-21-10.hdr
144	.PP
145	To compute a set of illuminance contributions for Window 1 on
146	the Winter solstice at 2pm:
147	.IP "" .2i
148	gensky 12 21 14 \| genskyvec \| dctimestep IllPts.vmx Blinds20.xml Window1.dmx > Ill_12-21-14.dat
149	.PP
150	To compute Window2's contribution to an interior view at 12 noon on the Summer solstice:
151	.IP "" .2i
152	gensky 6 21 12 \| genskyvec \| dctimestep view%03d.hdr Blinds30.xml
153	Window2.dmx > view_6-21-12.hdr
154	.PP
155	To generate an hourly matrix of sensor value contributions from Skylight3
156	using a 3-phase calculation, where output columns are time steps:
157	.IP "" .2i
158	gendaymtx -of Tampa.wea \| dctimestep WPpts.vmx
159	shade3.xml Skylight3.dmx > wp_win3.dat
160	.PP
161	Generate a series of pictures corresponding to timesteps
162	in an annual simulation:
163	.IP "" .2i
164	gendaymtx NYCity.wea \| dctimestep -o tstep%04d.hdr dcomp%03d.hdr
165	.PP
166	To multiply an irradiance view matrix through a pair of XML window layers using
167	a given exterior daylight matrix and sky vector:
168	.IP "" .2i
169	dctimestep Illum.vmx "!rmtxop -ff Blinds1.xml Windo1.xml" Exter.dmx Jan20.sky
170	.PP
171	To multiply two matrices into a IEEE-float result with header:
172	.IP "" .2i
173	dctimestep -of Inp1.fmx Inp2.fmx > Inp1xInp2.fmx
174	.SH AUTHOR
175	Greg Ward
176	.SH "SEE ALSO"
177	gendaymtx(1), genskyvec(1), getinfo(1),
178	mkillum(1), rcollate(1), rcontrib(1),
179	rfluxmtx(1), rmtxop(1), rtrace(1), vwrays(1)