relevant links:
https://www.cgtrader.com/free-3d-models?file_types%5B%5D=117
https://jeromeetienne.github.io/AR.js/aframe/build/aframe-ar.js
https://aframe.io/releases/1.0.4/aframe.min.js
https://jeromeetienne.github.io/AR.js/three.js/examples/marker-training/examples/generator.html