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Comparing ray/doc/man/man1/rvu.1 (file contents):
Revision 1.1 by greg, Thu Jan 1 19:31:45 2004 UTC vs.
Revision 1.2 by greg, Fri Jan 21 00:52:59 2005 UTC

#	Line 147 | Line 147 | is absent, or an '@' is followed by nothing, then
147		the cursor is used to pick a specific image
148		location for normalization.
149		.TP
150	+	.BI focus " [distance]"
151	+	Set focus distance for depth-of-field sampling.
152	+	If a distance in world coordinates is absent, then the cursor
153	+	is used to choose a point in the scene on which to focus.
154	+	(The focus distance setting does not affect rendering in
155	+	.I rview,
156	+	but can be used in
157	+	.I rpict
158	+	with the
159	+	.I \-pd
160	+	option to simulate depth-of-field on views saved from
161	+	.I rview.)
162	+	.TP
163		.BI frame " [ xmin ymin xmax ymax ]"
164		Set frame for refinement.
165		If coordinates are absent, the cursor is used to

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