Nice! Thanks for sharing! Didn't realize 3M was working in this space (but then again, whenever I ask or check if 3M is working on $randomThing, it turns out they do; it's a real-world ACME).

> but there was no takers in the end due to the IR requirement and such cameras not being everywhere yet

I wonder why that's the case. What kind of IR camera it required? I was under the impression that turning a regular camera into an IR one was just a matter of digging out its IR filter and replacing it with a visible light filter. Or did it require the kind of cameras that are used in thermal imaging? Unfortunately, I don't really know what the technical and business challenges are for ubiquitous IR. Could you share some information about it?