Add more informative link in pointtree comments.
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How this works:
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Points are sorted by their Morton numbers, which are interleaved x and y coordinate bits.
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See: http://en.wikipedia.org/wiki/Morton_number_(number_theory)
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See: http://en.wikipedia.org/wiki/Z-order_(curve)
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See also: http://en.wikipedia.org/wiki/Morton_number_(number_theory)
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When looking for points in a particular area, a search square is split up into 4 rectangles
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of varying sizes, and a quick binary search for point in those ranges is performed. The ranges
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