Reposted by Alex Tardif
Emissive shaders.
Type a temperature in K and get a blackbody colour – that's how most shaders do it, and it's wrong for practically every real material. Kirchhoff's law fixes it.
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Thermal light emission from hot objects
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...