http://blog.mmacklin.com/tags/volume-rendering/ Recent content in Volume Rendering on Miles Macklin Hugo -- gohugo.io en-us © 2019 Miles Macklin Wed, 29 Dec 2010 08:21:08 +0000 http://blog.mmacklin.com/2010/12/29/blackbody-rendering/ Wed, 29 Dec 2010 08:21:08 +0000 http://blog.mmacklin.com/2010/12/29/blackbody-rendering/ In between bouts of festive over-eating I added support for blackbody emission to my fluid simulator and thought I'd describe what was involved. Briefly, a blackbody is an idealised substance that gives off light when heated. Planck's formula describes the intensity of light per-wavelength with units W·sr-1·m-2·m-1 for a given temperature in Kelvins. Radiance has units W·sr-1·m-2 so we need a way to convert the wavelength dependent power distribution given by Planck's formula to a radiance value in RGB that we can use in our shader / ray-tracer.