I’m currently building a decor for a sci-fi setting, and one of its elements is that laser signalisation is used to mark temporary “streets” for coming emergency vehicles, danger areas, directions, etc.
I managed to make something that gave the desired effect; a particle system of red spotlights near the floor looks enough like laser dots for satisfaction, but render time wise this is grossly inefficient. Even with shadow-less lamps, this is still 66 light sources, and it only forms a short segment, I’d need several times that to make an actual street.
I tried making it with a shadow box instead, a single light inside a “shadow only” cube with holes in the bottom, but it needed to be close to the floor to look good, and if it’s possible to make an object cast a shadow from only one light and ignore the others, I don’t know it. So this method didn’t work with what I know to do.
I could also use a halo object to generate red dots, but they would only look shiny as long as the background isn’t too light, they’d be red, not red light.
I can’t make the dots part of the floor texture because I want to move the thing around. I could however create a transparent plane to place such a texture right over the floor. This would however take more work time than I’d save in render time, and I’m not sure the effect would be better than with the “halo” option.
Does anyone have suggestions on how to best make it?
Picture: what I currently have.