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Comparing ray/doc/man/man1/rtrace.1 (file contents):
Revision 1.11 by greg, Tue May 31 18:01:08 2005 UTC vs.
Revision 1.13 by greg, Tue Jun 14 03:34:14 2005 UTC

#	Line 178 | Line 178 | option (below) may be used to override this.
178		This option is especially useful in
179		conjunction with ximage(1) for computing illuminance at scene points.
180		.TP
181	+	.BR \-u
182	+	Boolean switch to control uncorrelated random sampling.
183	+	When "off", a low-discrepancy sequence is used, which reduces
184	+	variance but can result in a brushed appearance in specular highlights.
185	+	When "on", pure Monte Carlo sampling is used in all calculations.
186	+	.TP
187		.BR \-I
188		Boolean switch to compute irradiance rather than radiance,
189		with the input origin and direction interpreted instead

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