@djd711 you dont need to use mesh distance fields. It was just experimentation to somehow, at least partially, block the light shaft. If you dont need it then check out the light shaft material, disconnect distance field stuff, plug depthfade instead and thats it. Volumetric fog is unusable for this kind of thing unfortunately as vol. fog leaves traces behind for a couple of frames when you have fast moving/intensity changing light sources, and you’ll have blocky results with thin light cones, all limitations of volumetric fog.
So, you can easily achieve the system in the video you shared with my project without distance fields. Light shaft updates its color with light source color so you’ll need to animate the spot head(with a target actor), light intensity and light color, which makes 3 tracks per spotlight in sequencer(4 if you want to play with angle too.)
@moianminh2 lasers are in my to-do list. Off the top of my head i’d start with niagara beams. The other day i got an idea with procedural meshes too, both for normal light shafts and lasers, still havent tried it though.