I am looking for some clarity on what the 'samples' setting actually controls
for subsurface in global settings.

version 3.7 RC7

The documentation (3.4.6.3.3.4 Subsurface Light Transport) states the setting
controls "the number of samples for the diffuse scattering and single-scattering
approximation". What is the difference in diffuse scattering and single
scattering??

Now according to what I have read on the theory behind subsurface light
scattering there are so many bounces going on that regardless of the material
you will always get an isotropic scattering effect. So this would account for
the diffuse setting. I would assume this would be a similar setting to
scattering media type 1 and increasing samples will control how evenly light is
distributed.

 So I am puzzled at what is meant for single scattering and what that setting
will effect/control.

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