IIRC they did this is that movie with Vin Deisel. It was handled realistically in that he had to wear sunglasses in normal daylight since humans don't have cat pupils that can squeeze down to a tiny slit. It's probably doable with micosurgery but you would have to be way precise in injecting the reflective substance.[/quote]Sockmonkey wrote:Do you think surgery to give humans cat-like eyes would ever be possible? 'Cause I really want cats eye vision.
If whatever you're hiding from has IR goggles, no invisibility will work since a living body radiates heat and those pesky laws of themodynamics are real sticklers.
Granted you could wear a tank of liquid nitrogen on your back to cool the outside of your insulated invisibility suit but that's heavy and won't last long. Also, you could still be picked up on sonar.
Hmm, I want me some sonar goggles. Do they make them?
You could pump the heat from the outside surface into something in a different compartment of the suit and get it really really hot, and then shield it from emitting IR and visible light, and have it radiate all the heat away as UV. Although that doesn't help you much since then anyone with UV goggles could see you. Sonar, you could use the same sort of tricks with metamaterials to bend sound waves around you that you do with light. I remember seeing something where there were ideas to use that to acoustically hide pillars in concert halls and such, or use it to redirect waves around structures in the ocean.