@pixelpshr There isn’t an out-of-the-box way to do this, but it should be possible - it will just need some work on the Unity side. First, you’ll want to edit the tileset material to overlay a hex grid - I would suggest making a texture for the hexagon grid and setting it up in the material to repeat using world coordinates, which will make sure it repeats perfectly across terrain tiles and across levels of detail. Then you’ll need to be able to map long/lat coordinates to hex grid coordinates and back again - this will require some tweaking based on the way you set up your texture, but once you’ve figured out the proper scaling and offsetting, and algorithm like this one should help you convert from geo coordinates to hex grid coordinates (and, if you scroll up on that page to “Hex to pixel”, it’ll give you an algorithm for converting back from hex grid coordinates to geo coordinates).
I don’t have any examples of this at hand, as I’m not aware of anyone trying this before. But let me know if you run into any issues on the Cesium side with giving this a try.