There was a time when I did not know what a derailleur is. And while I can probably still not spell it (or pronounce it with an honest-to-God French accent), I can now tell you that it is a part of a bicycle. Eventually, I did have to learn the word and that is how I got the idea: if I ever open a bike shop (i.e. probably never), I would like it to be as handholding as it gets.

The 3D model was designed by Semyon Filippov and is available for free on CGTrader. It took a little bit of tweaking (with Blender) to group the parts and give them identifiers, so that they would be accessible through Javascript. For the final embedding I ended up using Babylon JS, which was shockingly easy to use (so kudos to the developers).