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Comparing ray/doc/man/man1/pabopto2bsdf.1 (file contents):
Revision 1.4 by greg, Fri Mar 26 19:48:22 2021 UTC vs.
Revision 1.6 by greg, Mon Apr 5 20:08:41 2021 UTC

# Line 10 | Line 10 | pabopto2bsdf - convert BSDF measurements to a scatteri
10   .B "\-n nproc"
11   ][
12   .B "\-s symmetry"
13 + ][
14 + .B "\-g angle | 'A'"
15   ]
16   .B "meas1 meas2 .."
17   .SH DESCRIPTION
# Line 95 | Line 97 | Note that only the "up" and "bilateral" symmetry optio
97   identical input coverage, so this is the only time the
98   .I \-s
99   option must be specified if the default mirroring is not appropriate.
100 + .PP
101 + If a
102 + .I \-g
103 + option is present, it will cull scattered measurements that are nearer
104 + to grazing than the given angle in degrees.
105 + If the word "auto" (which can be abbreviated as 'a' or 'A') is given
106 + instead of an angle, then the near-grazing angle will be determined
107 + by the lowest incident angle measurement present in the input data.
108 + This is sometimes necessary to eliminate noise and edge effects that
109 + some measurements exhibit near grazing.
110   .PP
111   The
112   .I Mountain

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