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Comparing ray/doc/ray.html (file contents):
Revision 1.7 by greg, Tue Oct 17 21:52:43 2006 UTC vs.
Revision 1.8 by greg, Fri Mar 12 18:34:43 2010 UTC

#	Line 659 | Line 659 | a perfectly scattering medium (no absorption).
659		The scattering eccentricity parameter will likewise override the global
660		setting if it is present.
661		Scattering eccentricity indicates how much scattered light favors the
662	<	forward direction, as fit by the Heyney-Greenstein function:
662	>	forward direction, as fit by the Henyey-Greenstein function:
663
664		<pre>
665		P(theta) = (1 - g*g) / (1 + g*g - 2*g*cos(theta))^1.5

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