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Comparing ray/doc/man/man1/vwrays.1 (file contents):
Revision 1.8 by greg, Sat Aug 20 20:57:51 2011 UTC vs.
Revision 1.9 by greg, Thu Jun 14 05:19:05 2012 UTC

#	Line 4 | Line 4
4		vwrays - compute rays for a given picture or view
5		.SH SYNOPSIS
6		.B vwrays
7	<	.B "[ -i -u -f{a|f|d} | -d ]"
7	>	.B "[ -i -u -f{a|f|d} -c rept | -d ]"
8		{
9		.B "view opts .."
10		|
#	Line 36 | Line 36 | default ASCII.
36		Using raw float or double records for example can reduce the time
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 rtcontrib(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	+	option should be used to jitter sample postions in most cases.
51		.PP
52		View options may be any combination of standard view parameters described
53		in the

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