Earlier versions of the now abandoned Seed of Andromeda [0] [1] had planet-scale voxels with physics! I remember causing huge avalanches with explosions, or watching many pools of water flowing downhill [2] myself, it had so much potential..

There was a dev blog or two I couldn't find in Wayback except a YouTube video [3] on how they mapped the sphere to voxels. Not that one would notice much local effects at these scales (Flat Earth illusion), but Blocky Planet showcases the other end of the extremes, where Distant Horizons' curvature option or some other rounded world shaders out there could never achieve! (+Outer Wilds vibes)

[0]: https://github.com/RegrowthStudios

[1]: https://web.archive.org/web/20210416224527/https://www.seedo...

[2]: https://youtu.be/qCoyNH6y7CU?t=529 + at 9:23

[3]: https://youtu.be/bJr4QlDxEME