Blackbody

Keywords: Blackbody ramp,Blackbody radiation

Blackbody radiation defines what colors are emitted at different temperatures on a blackbody object.

Practically, it generates a color ramp that can be used for things like fire and explosions. Its input is a temperature in kelvin and the output is a colorvalue. Combined with gradient mapping, it's a useful tool for coloring effects.

Examples of temperatures and corresponding values can be found here:

https://renderman.pixar.com/resources/RenderMan_20/PxrBlackbody.html