Well I love a good book, but inbuilt PDF  is easier because you hit F! in vue and ip pops help, type in search string, and bingo! answer :)

ok useful termms

SSS, TRANSLUCENCY
all the same thing, SSS - sub surface scattering
many real world materials let light bounce aorund inside them to an extent, like flesh, milk etc, they are not truly transparent, not totally opaque.
it's why you a person's ear is so lit up when a light is behind them, the light boucnes aorund form back to front
this means people's skins aren't as dark as they should be, almost slightly  luminous

FE
Function Edtior, usually in the material editor. can also be for terrains.

MAPPING
how materials are mapped onto a 3D object

REFRACTION
transparent objects, even air, bend light slightly. so each has a refraction index,,diamond has such a huge refraction that makes i tlook so interesting
water - 1.3
glass 1.5
sapphire 1.7
diamond 2.8

:)

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