Light functions allow lighters in Unreal to animate otherwise stationary lights, as well as project textures from them. Tom Sirdevan, look developer and lighting artist, walks through the steps necessary to create your own light functions for both stationary or moveable lights that project textures that move over time.
- [Voiceover] Let's move on to light functions.…Lights can be customized further with light functions.…They're essentially materials that control…the light intensity.…If I go back into the courtyard area,…and create a point light,…and go to lit mode, increase the intensity…just a little bit.…I'm now going to go to light function.…
By default there is no light function.…You're gonna see none, so what we're gonna do…is go to materials in the content browser,…right-click and create a material.…I'm gonna call it lightmat, and then I'm gonna…drag that lightmat over to the light function…material parameter for the light.…Then I'm gonna double-click on the gray ball,…and it's gonna open the material editor.…
The first thing I need to do…is select the root node if it's not already selected,…and go over to material domain,…and change that from surface to light function.…Now you'll notice that the only input parameter…is emissive color.…If I right-click and…ask for a Constant3Vector,…and plug that into the emissive color,…and give it something like a .65 value,…
Author
Tom Sirdevan
Released
7/6/2016- Direct lighting
- Indirect lighting
- Creating a sky with Blueprint
- Deferred shading
- Dynamic sky and sun
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Video: Light functions