Lino Thomas writes:
Sometimes volumetrics are too slow for the result you are going for, in this tutorial i show you how to create fake volumetric light cones for a much quicker rendering.
Important: In the "light paths" tab you can find the "max bounces" settings. Do increase the "max bounces" number if any black areas appear when using many light cones.
Pro tip: These light cones render noise free with only one sample.
You can render them on a separate render layer and add them in the compositor to save even more render time ;)