Don’t quote me on what I’m saying as I’m not completely sure of the situation, but I believe that the volumetric lighting displayed in the video wasn’t technically a feature of the future is bright version shown. (1.0 v15 I believe)
In that version of the future is bright a feature was added that allowed shadows and light to be cast on both billboard GUIs and particles. The volumetric lighting in the video was likely achieved by having hundreds of almost invisible, blank billboard guis with a light influence of 1 offset tiny increments in front of the camera.
This means that the GUIs would only show where there was light being cast. In addition to this if the GUIs are blank and white, the areas where the billboard guis are visible would also be coloured according to the light being cast on them, essentially giving an extremely good volumetric lighting effect.
Unfortunately the feature of having proper shadows displayed on particles and billboard GUIs was removed in v16, making it impossible to replicate the effect with this method.
While the effect of having volumetric lighting wasn’t an official feature, I’m really hoping that the ability to have shadows casted on particles and billboard GUIs returns in a future update mainly for the purpose of having volumetric lighting in-game.
EDIT:corrected the version numbers