Most emissive shaders in CG make hot metal glow the same way: you type a temperature in Kelvin, a blackbody function turns it into a colour, and that colour is added on top of the material. Gold, iron...

There's an intuitive move every render artist reaches for when a subsurface material looks too dense: turn up SSS scale. Dense SSS with MFP:1 Bigger mean free path (SSS radius).

When subsurface scattering (SSS) is driven by a blue-noise distribution, classical light transport breaks down. Light no longer decays exponentially according to the traditional Beer-Lambert law.

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