That was a good explanation to calculating the index of a point on the Hilbert curve - I had been wondering how that was done myself. I'm going to have to sit d

That was a good explanation to calculating the index of a point on the Hilbert curve - I had been wondering how that was done myself. I'm going to have to sit down and implement one of these someday. Other than the quadtree, the Hilbert curve can be used to optimize the r-tree as well: http://en.wikipedia.org/wiki/Hilbert_R-tree http://en.wikipedia.org/wiki/Hilbert_R-tree .