Here I’ll show you a quick video of how I used light functions in UDK to bring simple fire to life in my Gothic Cathedral demo.
Below you’ll find a still image of the material I built for this light function. You may also be interested to know that I used this same technique to achieve the stained glass lighting for the Gothic Cathedral. For stained glass, it was as simple as creating a new light function material that added the stained glass texture to an emissive node. Nothing fancy about it like the one below, just texture to emissive. Though you’ll also need to make the static mesh with an emissive material to achieve the proper effect.