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Comparing ray/doc/man/man1/gendaymtx.1 (file contents):
Revision 1.11 by greg, Tue Jan 7 01:42:30 2020 UTC vs.
Revision 1.19 by greg, Wed Feb 26 20:39:28 2025 UTC

# Line 13 | Line 13 | gendaymtx - generate an annual Perez sky matrix from a
13   ][
14   .B "\-d|\-s|\-n"
15   ][
16 < .B "\-D sunfile"
16 > .B "\-u"
17   ][
18 + .B "\-D sunfile"
19 + [
20 + .B "\-M sunmods"
21 + ]][
22   .B "\-r deg"
23   ][
24   .B "\-m N"
# Line 25 | Line 29 | gendaymtx - generate an annual Perez sky matrix from a
29   ][
30   .B "-o{f|d}"
31   ][
32 < .B "-O{0|1}"
32 > .B "\-O{0|1}"
33 > ][
34 > .B "\-i intvl"
35   ]
36   [
37   .B "tape.wea"
38 + or
39 + .B "tape.epw"
40   ]
41   .SH DESCRIPTION
42   .I Gendaymtx
43   takes a weather tape as input and produces a matrix of sky patch
44   values using the Perez all-weather model.
45 < The weather tape is assumed to be in the simple ASCII format understood
45 > The weather tape may be in the simple ASCII format understood
46   by DAYSIM, which contains a short header with the site parameters followed
47   by the month, day, standard time, direct normal and diffuse horizontal
48   irradiance values, one time step per line.
49 + Alternatively, a standard EPW (Energy Plus Weather) input may be provided,
50 + in which case additional information such as the dew point temperature may
51 + be used in the calculation.
52   Each time step line is used to compute a column in the output matrix,
53   where rows correspond to sky patch positions, starting with 0 for
54   the ground and continuing to 145 for the zenith using the default
# Line 77 | Line 88 | The default value is
88   .I "\-g 0.2 0.2 0.2"
89   corresponding to a 20% gray.
90   .PP
91 + If there is a sun in the description,
92 + .I gendaymtx
93 + will include its contribution in the four nearest sky patches,
94 + distributing energy according to centroid proximity.
95   The
96   .I \-d
97   option may be used to produce a sun-only matrix, with no sky contributions,
# Line 84 | Line 99 | and the ground patch also set to zero.
99   Alternatively, the
100   .I \-s
101   option may be used to exclude any direct solar component from the output,
102 < with the rest of the sky and ground patch unaffected.
88 < If there is a sun in the description,
89 < .I gendaymtx
90 < will include its contribution in the four nearest sky patches,
91 < distributing energy according to centroid proximity.
102 > with the other sky and ground patches unaffected.
103   .PP
104   The
105 + .I \-u
106 + option ignores input times when the sun is below the horizon.
107 + This is a convenient way to average daylight hours only with the
108 + .I \-A
109 + option or to ensure that matrix entries correspond to solar positions
110 + produced with the
111 + .I \-D
112 + option, described below.
113 + .PP
114 + The
115   .I \-n
116 < option may be used if no matrix output is desired.
116 > option may be used if no matrix output is desired at all.
117   This may be used to merely check the input, or in combination with the
118   .I \-D
119   option, below.
# Line 101 | Line 122 | The
122   .I \-D
123   option may be used to specify an output file to contain a list of
124   solar positions and intensities corresponding to time steps in the
125 < weather tape where the sun is visible above the horizion.
125 > weather tape where the sun has any portion above the horizon.
126 > Sun radiance values may be zero if the direct amount is zero on the input.
127 > Sun modifiers and names will be indexed by the minute, numbered from
128 > midnight, January 1st.
129 > If a hyphen ('-') is given as the argument to
130 > .I \-D,
131 > then the sun descriptions  will be directed to the standard output.
132 > This implies the
133 > .I \-n
134 > option just described.
135 > If the
136 > .I \-M
137 > option is given as well, it will be used to record the modifier
138 > names used in the
139 > .I \-D
140 > output, for convenient input to
141 > .I rcontrib(1)
142 > and
143 > .I rfluxmtx(1).
144   .PP
145   By default,
146   .I gendaymtx
# Line 123 | Line 162 | through
162   using a similar transform.
163   .PP
164   The
165 + .I \-i
166 + option specifies the actual capture interval in minutes of the original
167 + weather data.
168 + Please see the man page for
169 + .I gendaylit
170 + to understand this correction, which is applied only near sunrise and
171 + sunset.
172 + .PP
173 + The
174   .I \-of
175   or
176   .I \-od
# Line 158 | Line 206 | Ian Ashdown wrote most of the code,
206   based on Jean-Jacques Delaunay's original gendaylit(1) implementation.
207   Greg Ward wrote the final parameter parsing and weather tape conversion.
208   .SH "SEE ALSO"
209 < dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1),
210 < rcollate(1), rcontrib(1), xform(1)
209 > dctimestep(1), genBSDF(1), gendaylit(1), gensdaymtx(1), gensky(1),
210 > genskyvec(1), genssky(1),
211 > rcollate(1), rcontrib(1), rfluxmtx(1), rmtxop(1), xform(1)

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