Distance scale indicator

CesiumJS
3

I believe you can now find the code here
github.com/TerriaJS/terriajs/blob/2a395fe45ca239c8d2110f4c0f0474a3efcf8b9e/lib/ReactViews/Map/Legend/DistanceLegend.jsx

There was another thread about this(5 years ago)
2d scale implementation for Legend?