Is it possible to create holograms with three.js or p5.js etc?
Yep we do have a three.js library called HoloPlay.js, and that will work with the Looking Glass Portrait. You can find more about that here: https://docs.lookingglassfactory.com/Holoplayjs/
However, you'll see that it's currently marked as Legacy software, meaning we won't be making updates to it. We've got a lot of exciting stuff planned for our 2021 roadmap and couldn't commit to regularly updating the tool. If we get a lot of feedback from our community that this is an important software product for their needs, we'll reassess!