| 1 |
|
.\" RCSid $Id$" |
| 2 |
|
.TH DCTIMESTEP 1 12/09/09 RADIANCE |
| 3 |
|
.SH NAME |
| 4 |
< |
dctimestep - compute annual simulation time-step via matrix multiplication |
| 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 "\-o ospec" |
| 11 |
+ |
][ |
| 12 |
+ |
.B "\-i{f|d} |
| 13 |
+ |
][ |
| 14 |
+ |
.B "\-o{f|d} |
| 15 |
+ |
] |
| 16 |
|
.B DCspec |
| 17 |
|
[ |
| 18 |
< |
.B skyvec |
| 18 |
> |
.B skyf |
| 19 |
|
] |
| 20 |
|
.br |
| 21 |
|
.B dctimestep |
| 22 |
+ |
[ |
| 23 |
+ |
.B "\-n nsteps" |
| 24 |
+ |
][ |
| 25 |
+ |
.B "\-o ospec" |
| 26 |
+ |
][ |
| 27 |
+ |
.B "\-i{f|d} |
| 28 |
+ |
][ |
| 29 |
+ |
.B "\-o{f|d} |
| 30 |
+ |
] |
| 31 |
|
.B Vspec |
| 32 |
|
.B Tbsdf.xml |
| 33 |
|
.B Dmat.dat |
| 34 |
|
[ |
| 35 |
< |
.B skyvec |
| 35 |
> |
.B skyf |
| 36 |
|
] |
| 37 |
|
.SH DESCRIPTION |
| 38 |
|
.I Dctimestep |
| 40 |
|
In the first form, |
| 41 |
|
.I dctimestep |
| 42 |
|
is given a daylight coefficient specification and an optional sky |
| 43 |
< |
vector, which may be read from the standard input if unspecified. |
| 44 |
< |
The daylight coefficients are multiplied against this vector and the results |
| 45 |
< |
are written to the standard output. |
| 43 |
> |
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 |
|
This may be a list of color values or a combined Radiance image, |
| 47 |
|
as explained below. |
| 48 |
|
.PP |
| 64 |
|
with |
| 65 |
|
.I rcontrib |
| 66 |
|
in a separate run for each window or skylight orientation. |
| 67 |
< |
The final input is the sky contribution vector, |
| 68 |
< |
usually computed by |
| 69 |
< |
.I genskyvec(1), |
| 70 |
< |
which may be passed on the standard input. |
| 71 |
< |
This data must be in ASCII format, whereas the View and Daylight matrices |
| 72 |
< |
are more efficiently represented as binary float data if machine |
| 73 |
< |
byte-order is not an issue. |
| 67 |
> |
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 |
> |
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 |
> |
format, respectively, which is more efficient for large matrices. |
| 82 |
> |
(Note that binary double data may not be read from stdin.)\0 |
| 83 |
|
.PP |
| 84 |
|
Sent to the standard output of |
| 85 |
|
.I dctimestep |
| 86 |
< |
is either an ASCII color vector with as many RGB triplets |
| 86 |
> |
is either a color vector with as many RGB triplets |
| 87 |
|
as there are rows in the View matrix, or a combined |
| 88 |
|
.I Radiance |
| 89 |
|
picture. |
| 95 |
|
.I Radiance |
| 96 |
|
component pictures, which will be summed according to the computed |
| 97 |
|
vector. |
| 98 |
+ |
.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 |
+ |
from the standard input or from a file. |
| 106 |
+ |
The columns do not need to be given on the same |
| 107 |
+ |
line, so long as the number of values totals 3*Nsteps*Npatches. |
| 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 |
+ |
or separate result vectors (one per time step). |
| 119 |
+ |
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 |
|
.SH EXAMPLES |
| 138 |
|
To compute workplane illuminances at 3:30pm on Feb 10th: |
| 139 |
|
.IP "" .2i |
| 141 |
|
.PP |
| 142 |
|
To compute an image at 10am on the equinox from a set of component images: |
| 143 |
|
.IP "" .2i |
| 144 |
< |
gensky 3 21 10 | genskyvec | dctimestep viewc%03d.hdr > view_03-21-10.hdr |
| 144 |
> |
gensky 3 21 10 | genskyvec | dctimestep dcomp%03d.hdr > view_03-21-10.hdr |
| 145 |
|
.PP |
| 146 |
|
To compute a set of illuminance contributions for Window 1 on |
| 147 |
|
the Winter solstice at 2pm: |
| 150 |
|
.PP |
| 151 |
|
To compute Window2's contribution to an interior view at 12 noon on the Summer solstice: |
| 152 |
|
.IP "" .2i |
| 153 |
< |
gensky 6 21 12 | genskyvec | dctimestep view%03d.hdr Blinds30.xml Window2.dmx > view_6-21-12.hdr |
| 153 |
> |
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 |
> |
.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 |
|
.SH AUTHOR |
| 173 |
|
Greg Ward |
| 174 |
|
.SH "SEE ALSO" |
| 175 |
< |
genklemsamp(1), genskyvec(1), mkillum(1), rcontrib(1), rtrace(1), vwrays(1) |
| 175 |
> |
gendaymtx(1), genklemsamp(1), genskyvec(1), getinfo(1), |
| 176 |
> |
mkillum(1), rcollate(1), rcontrib(1), rtrace(1), vwrays(1) |
