First I'd like to say I'm impressed with the number of people skilled in various fields in this forum, I more commonly get an answer here than in a specialized community. Thank you.
I'm back again with a non-laser question.
I'm looking for this retro-reflective foldable material used for high gain, low angle (sometimes passive 3d stereo) video projectors.
https://www.youtube.com/watch?v=3sQ-ZcMvtg0
https://www.youtube.com/watch?v=IJrXf6waoUI
https://www.youtube.com/watch?v=4FhdqMpTgSk
Sadly this company and it's community is dead so I can't ask what they were using for the retroreflective sheets. All I could find was it's cheap.
It may be some kind of retro-reflective tarp probably sold in rolls and used for outdoor items such as tents, but I swear anywhere I ask for such a high gain projection sheet some video projector screen seller jumps out of the bushes and tries to sell me his High Gain Super-Bright TripleX Silver™ projection screen or cloth with patented secret technology or something along those lines, costing hundreds of dollars. I need like 1 meter wide 40 meter long roll for a project so I can't afford to use a premium home cinema product here.