Just a quick link with some informations regarding the workings behind sub surface scattering. I would also recommend having a look at the book ShadersX³

http://www.neilblevins.com/cg_education/translucency/translucency.htm

Greetings
Sven

"Feathers shall raise men even as they do birds, toward heaven; that is by letter written with their quills." - Leonardo da Vinci

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