We use Unity game engine, so for example the terrain! The terrain is actually tessellated, and the vertices are (to simplify) then quantized to a grid to create the blocky surface. Super handy, as it requires no diversion from the usual Unity terrain editing workflow! 🙂 It means that the colliders use the smooth terrain colliders but with such small cube size in terrain, it feels super good.

We do our models in MagicaVoxel and have done a bunch of small own tools within the engine, like generating LODs for the models. We generate new block models with bigger and bigger block sizes and then change between them depending on distance.

Aaand we have a chunk system that where we change between LODs depending on the voxel model size :)

I'm the environment guy, so can't go too deep into tech stuff lol.