Many of my interactive projection ideas look like light on a black background, but I often want to incorporate blob tracking. The problem is how do I project white/light lines when light is needed to illuminate the things that become blobs?
Voila! UV light can illuminate objects in the almost-dark. I tested play-doh on a satin-like (shiny) cheap party table cloth. The flashlight stands in for a projected light. It’s visible on the black and can be keyed out to avoid blob detection.
I also found some interesting things can be done with making blobs appear and disappear with the additional white light, so that’s a possibility for experiments.
The last two images show what it looks like without UV lighting.
