To do on/off of caustics and a soft shadow every light.
This plug in has on/off of caustics and a soft shadow every light in "Affect Caustics" in a property of a light.
Can use caustics and a soft shadow by all lights type, but when does this setting in "Distant Light", change it in other lights type once, and set "caustics availability", and please return a light type to "Distant Light" again.

About a parameter of surface of inside looking.
Transparency of inside looking surface decides ray permeability of the object inside.
A refractive index when set surface in "Inside" is a refractive index of the inside of an object (a direction of a normal).
Set a refractive index of air to inside looking surface by technique of regular LW.
Please use "No define" when wants to use a setting method the same as it.

About a gap of "Outside" surface and "Inside" surface.
When does not use an sub-patch, there is not need to leave a gap between surface.
But when uses an sub-patch, a gap of 10um-20um becomes necessary.
(add displacement plug in to make a gap of surface on a layout in few days.)

About comparison with "BSSRDF paper" of Stanford.
If you want to compare speed of this plug in with a rendering sample of "BSSRDF paper", use cache by all means.
A function of cache of this plug in is almost the same as a function called "Photon map" in "BSSRDF paper".
Because I choose a thing of good quality, I do cache in off in a state of a default.
But please use cache when you think that "this is slow".

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