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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 1.14 by greg, Sun Feb 5 22:22:20 2006 UTC

#	Line 87 | Line 87 | d      direction (normalized)
87		.IP
88		v       value (radiance)
89		.IP
90	+	V       contribution (radiance)
91	+	.IP
92		w       weight
93		.IP
94		W       color coefficient
#	Line 177 | Line 179 | though the
179		option (below) may be used to override this.
180		This option is especially useful in
181		conjunction with ximage(1) for computing illuminance at scene points.
182	+	.TP
183	+	.BR \-u
184	+	Boolean switch to control uncorrelated random sampling.
185	+	When "off", a low-discrepancy sequence is used, which reduces
186	+	variance but can result in a brushed appearance in specular highlights.
187	+	When "on", pure Monte Carlo sampling is used in all calculations.
188		.TP
189		.BR \-I
190		Boolean switch to compute irradiance rather than radiance,

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