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Comparing ray/doc/man/man1/vwrays.1 (file contents):
Revision 1.6 by greg, Mon Nov 10 19:08:17 2008 UTC vs.
Revision 1.12 by greg, Sat Dec 4 16:29:29 2021 UTC

# Line 4 | Line 4
4   vwrays - compute rays for a given picture or view
5   .SH SYNOPSIS
6   .B vwrays
7 < .B "[ -i -f{a|f|d} | -d ]"
7 > .B "[ -i -u -f{a|f|d} -c rept | -d ]"
8   {
9   .B "view opts .."
10   |
# Line 25 | Line 25 | The
25   .I \-i
26   option may be used to specify desired pixel positions on the standard
27   input rather than generating all the pixels for a given view.
28 + If the
29 + .I \-u
30 + option is also given, output will be unbuffered.
31   .PP
32   The
33   .I \-f
# Line 34 | Line 37 | Using raw float or double records for example can redu
37   requirements of transferring and interpreting information in
38   .I rtrace.
39   .PP
40 + The
41 + .I \-c
42 + option repeats each pixel the given number of times (default is 1).
43 + This is most useful when sending rays to
44 + .I rcontrib(1)
45 + with the same
46 + .I \-c
47 + setting, providing a much faster way to average pixels over image sets.
48 + The
49 + .I \-pj
50 + and/or
51 + .I \-pd
52 + options should be used to jitter sample postions in most cases.
53 + .PP
54   View options may be any combination of standard view parameters described
55   in the
56   .I rpict(1)
# Line 55 | Line 72 | aspect ratio, unless this ratio is set to zero.
72   The
73   .I \-pj
74   option may be used to jitter samples.
75 < The default value of 0 turns off ray jittering.
75 > The
76 > .I \-pd
77 > option specifies a world-diameter aperture for depth-of-field jittering.
78 > The default value of 0 for both options turns off all ray jittering.
79   .PP
80   If the
81   .I \-d
# Line 90 | Line 110 | otherwise, which would produce a uniform clipping dist
110   .PP
111   If a picture is given on the command line rather than a set of view options,
112   then the view and image dimensions are taken from the picture file, and
113 < the reported ray origins and directions will exactly match the center of each
114 < pixel in the picture.
113 > the reported ray origins and directions will match the center of each
114 > pixel in the picture (plus optional jitter).
115   .PP
116   If a depth buffer file is given as well, then
117   .I vwrays
# Line 129 | Line 149 | can reproduce any pixel ordering (i.e., any image orie
149   a rendered picture, it will only produce standard scanline-ordered rays when
150   given a set of view parameters.
151   .SH "SEE ALSO"
152 < rcalc(1), rpict(1), rtcontrib(1), rtrace(1)
152 > rcalc(1), rcode_depth(1), rcontrib(1), rpict(1), rtpict(1), rtrace(1)

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