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Comparing ray/doc/man/man1/gendaymtx.1 (file contents):
Revision 1.10 by greg, Tue Jun 25 00:09:45 2019 UTC vs.
Revision 1.13 by greg, Sat Aug 15 03:28:56 2020 UTC

# Line 11 | Line 11 | gendaymtx - generate an annual Perez sky matrix from a
11   ][
12   .B "\-A"
13   ][
14 < .B "\-d|\-s"
14 > .B "\-d|\-s|\-n"
15   ][
16 + .B "\-D sunfile"
17 + [
18 + .B "\-M sunmods"
19 + ]][
20   .B "\-r deg"
21   ][
22   .B "\-m N"
# Line 44 | Line 48 | parameter setting.
48   .PP
49   Increasing the
50   .I \-m
51 < parameter, typically by factors of two, yields a higher resolution
51 > parameter yields a higher resolution
52   sky using the Reinhart patch subdivision.
53   For example, setting
54   .I "\-m 4"
# Line 88 | Line 92 | If there is a sun in the description,
92   will include its contribution in the four nearest sky patches,
93   distributing energy according to centroid proximity.
94   .PP
95 + The
96 + .I \-u
97 + option ignores input times when the sun is below the horizon.
98 + This is a convenient way to average daylight hours only with the
99 + .I \-A
100 + option or to ensure that matrix entries correspond to solar positions
101 + produced with the
102 + .I \-D
103 + option, described below.
104 + .PP
105 + The
106 + .I \-n
107 + option may be used if no matrix output is desired at all.
108 + This may be used to merely check the input, or in combination with the
109 + .I \-D
110 + option, below.
111 + .PP
112 + The
113 + .I \-D
114 + option may be used to specify an output file to contain a list of
115 + solar positions and intensities corresponding to time steps in the
116 + weather tape where the sun has any portion above the horizion.
117 + Sun radiance values may be zero if the direct amount is zero on the input.
118 + Sun modifiers and names will be indexed by the minute, numbered from
119 + midnight, January 1st.
120 + If a hyphen ('-') is given as the argument to
121 + .I \-D,
122 + then the sun descriptions  will be directed to the standard output.
123 + This implies the
124 + .I \-n
125 + option just described.
126 + If the
127 + .I \-M
128 + option is given as well, it will be used to record the modifier
129 + names used in the
130 + .I \-D
131 + output, for convenient input to
132 + .I rcontrib(1)
133 + and
134 + .I rfluxmtx(1).
135 + .PP
136   By default,
137   .I gendaymtx
138   assumes the positive Y-axis points north such that the first sky patch
# Line 144 | Line 189 | based on Jean-Jacques Delaunay's original gendaylit(1)
189   Greg Ward wrote the final parameter parsing and weather tape conversion.
190   .SH "SEE ALSO"
191   dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1),
192 < rcollate(1), rcontrib(1), xform(1)
192 > rcollate(1), rcontrib(1), rfluxmtx(1), xform(1)

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