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Comparing ray/doc/man/man1/gendaymtx.1 (file contents):
Revision 1.12 by greg, Mon Apr 13 17:12:19 2020 UTC vs.
Revision 1.14 by greg, Fri Sep 11 16:53:57 2020 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 < ][
21 > ]][
22   .B "\-r deg"
23   ][
24   .B "\-m N"
# Line 93 | Line 95 | will include its contribution in the four nearest sky
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.
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.

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