>>   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.
>>
>>
>
> Single scattering is for rays that only scatters once in the material.
> Enter, scatter, exit.
> A low value for that can create some star shapes around highlights, at
> least, that's what I got in my experiments.
>
> Diffuse scattering is for rays that scatters many times.
>
> The best thing to do, is to make a test scene with only a single simple
> shape, like a plain white sphere, a single light_source and the camera.
>
> Now, play around with the parameters.
>
>
>
> Alain
That "star" shape can be elusive and seem to be very scene dependent.

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