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Z-order curve — how to query all nearest neighbors?

TLDR: How to query all nearest neighbors with the least effort? (Iterating over a bigger neighboring area that's continuous and filtering out elements that are not immediate neighbors?) Suppose the ...
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Overlap detection, nearest neighbors

I'm trying to get something similar to the Nearest Neightbor Problem, except I only want neighbors with radius overlapping a radius, and all of them. I'll explain my problem before explaining what I ...