I have a setup where an infrared depth camera is being used to do some (very basic) motion tracking in realtime. This is now generally working very well, but if a performer sits down on a sofa for example, they end up at both a similar depth to the sofa as they are sitting on it and the sofa's fabric deforms enough that the motion capture software starts to consider it an animate object, usually part of the performer who sat down, throwing the whole capture off.
I've noticed that certain objects (shiny, black plastic usually) don't appear to reflect much infrared light at all and come through as being at an infinite depth which got me thinking - is it possible that I could get a throw or something which either absorbs or scatters the vast majority of incoming infrared light to hide the object(s) beneath from the depth camera?
The hard thing with this is, if I'm looking at fabrics online, they unsurprisingly rarely if ever include any details regarding their properties in the infrared spectrum.
Is a material like this a thing? And if anyone is aware of a more appropriate stack exchange for this question I will gladly move it.