Comment by esperent
I work in the web 3d space, but unfortunately I know nothing about working with Babylon.js. What made you choose this engine? Did you evaluate cesium.js or three.js? Three.js would get you probably a couple of orders of magnitude more potential contributors, while cesium.js is designed for exactly this kind of project - at least that's my understanding, I haven't personally used it either.
EDIT: btw this sounds like a complaint but I didn't mean it that way. You might have really good reasons for your choice and I'm curious to hear them if you're willing to share.
All good, it's a valid question.
I'm actually using cesium.js for the replay mode (https://cubetrek.com/replay/6638) using Google Earth data.
For the 3D mode I was evaluating both Three.js and Babylon.js, and back when I started Babylon.js seemed a bit more exciting as I could set everything up a bit faster, so it was not an objective choice. But perhaps it was the wrong decision in hindsight...