[Bf-cycles] SSS falloff scale compatibility

[Greg Zaal]

Greetings guys

Just a quick observation from an artist's point of view, the new SSS
falloff function scales are vastly different, making it hard for anyone to
see the difference it makes without trying to find the same sort of scale.
Comparison: http://i.imgur.com/iI4yl5O.png
I understand the math is vastly different, and that there's probably some
scale convention that's being conformed to, but it makes sense to me if the
Scale units are at least consistent. I like the idea of it being measured
in Blender Units, but of course the cubic function is an infinite curve (if
my high-school math is remembered correctly) so just a visually similar
scale is fine.

And of course, thanks Brecht for all these awesome SSS additions :D
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