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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 1.15 by greg, Wed Feb 17 02:30:08 2021 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 "\-u"
17 + ][
18 + .B "\-D sunfile"
19 + [
20 + .B "\-M sunmods"
21 + ]][
22   .B "\-r deg"
23   ][
24   .B "\-m N"
# Line 44 | Line 50 | parameter setting.
50   .PP
51   Increasing the
52   .I \-m
53 < parameter, typically by factors of two, yields a higher resolution
53 > parameter yields a higher resolution
54   sky using the Reinhart patch subdivision.
55   For example, setting
56   .I "\-m 4"
# Line 88 | Line 94 | If there is a sun in the description,
94   will include its contribution in the four nearest sky patches,
95   distributing energy according to centroid proximity.
96   .PP
97 + The
98 + .I \-u
99 + option ignores input times when the sun is below the horizon.
100 + This is a convenient way to average daylight hours only with the
101 + .I \-A
102 + option or to ensure that matrix entries correspond to solar positions
103 + produced with the
104 + .I \-D
105 + option, described below.
106 + .PP
107 + The
108 + .I \-n
109 + option may be used if no matrix output is desired at all.
110 + This may be used to merely check the input, or in combination with the
111 + .I \-D
112 + option, below.
113 + .PP
114 + The
115 + .I \-D
116 + option may be used to specify an output file to contain a list of
117 + solar positions and intensities corresponding to time steps in the
118 + weather tape where the sun has any portion above the horizon.
119 + Sun radiance values may be zero if the direct amount is zero on the input.
120 + Sun modifiers and names will be indexed by the minute, numbered from
121 + midnight, January 1st.
122 + If a hyphen ('-') is given as the argument to
123 + .I \-D,
124 + then the sun descriptions  will be directed to the standard output.
125 + This implies the
126 + .I \-n
127 + option just described.
128 + If the
129 + .I \-M
130 + option is given as well, it will be used to record the modifier
131 + names used in the
132 + .I \-D
133 + output, for convenient input to
134 + .I rcontrib(1)
135 + and
136 + .I rfluxmtx(1).
137 + .PP
138   By default,
139   .I gendaymtx
140   assumes the positive Y-axis points north such that the first sky patch
# Line 144 | Line 191 | based on Jean-Jacques Delaunay's original gendaylit(1)
191   Greg Ward wrote the final parameter parsing and weather tape conversion.
192   .SH "SEE ALSO"
193   dctimestep(1), genBSDF(1), gendaylit(1), gensky(1), genskyvec(1),
194 < rcollate(1), rcontrib(1), xform(1)
194 > rcollate(1), rcontrib(1), rfluxmtx(1), xform(1)

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