Re: 3d dots in space...
But your dot matrix will have to be infrared to start with and will be different for every single person, and therefore would need significant time with the owner's phone to try repeated attempts of millions of patterns etc.
This isn't trying to use AI to decide what a 2d image looks like and you can try over and over. This is deciding whether a biometric input matches the one that is stored on the encrypted pattern on the phone. You aren't even trying to fool it into thinking that it is looking at a 3d face from a 2d image. You are asking it to match it up with a single 3d face. Millions of times more complex.
Therefore massively different from your proposal. If it really is that easy then the Apple face-id would have been hacked using that method a long time ago.