[DGD] Using r-trees to subdivide a world

[Shentino]

I've been pondering making my main world a continuous world (possibly
using spherical coordinates, possibly using cartesian, have not yet
decided), and one thing I took a keen interest in looking at is the
r-tree and x-tree and other spatially specialized b-trees.

Does anyone have practical experience in dealing with these?

I'm gunning for three dimensions.