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Comparing ray/doc/man/man1/rvu.1 (file contents):
Revision 1.7 by greg, Fri Oct 18 17:20:55 2013 UTC vs.
Revision 1.8 by greg, Sat Oct 19 18:40:26 2013 UTC

#	Line 246 | Line 246 | may be changed if the new direction coincides.
246		Similar to the "move" command, but pivots the view about a selected point.
247		The
248		.I angle
249	<	is measured in degrees around the view up vector using the right hand rule.
249	>	is measured in degrees around the view up vector using the right hand rule,
250	>	so a positive value pivots the viewer to the right of the selected point.
251		The optional
252		.I elev
253		is the elevation in degrees from the pivot point; positive raises the view point
#	Line 265 | Line 266 | color table selection.
266		.BI rotate " angle [ elev [ mag ] ]"
267		Rotate the camera horizontally by
268		.I angle
269	<	degrees.
269	>	degrees using the right-hand rule.
270	>	A positive value rotates the view towards the left, and a negative value
271	>	looks to the right.
272		If an elevation is specified, the camera looks upward
273		.I elev
274		degrees.

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