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Quadtree - Constraining nodes to within 1 level.

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I need to modify my quadtree class to be able to constrain each node to within one level of any neighbour. I have NO idea how to do this. Help please? I know It can be done, I've heard of numerous people doing it, but I haven't heard anything in terms of the how.

Edit: And could anyone tell me of a elegant way of finding neighbours for nodes? I plan to just test whether the AABB corners are equal to the AABB corners of other nodes, by some sort of recursive function with an epsilon for floating point error.

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