how much tiles in a chunk ?

[fierce junco]

the map grid is not made of squares, while the world is 870x870 voxels, (vertical it's 296 voxels).
The map is 26 high and 31 wide, so a rectangle of the grid is around 33.5 voxels wide and 28 voxels high

one power floor is 1x1x1 voxel