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Love bug deep dives like these. Along a similar line is the "foxes lead users to treasure" behavior in Skyrim: https://twitter.com/JoelBurgess/status/1428008041887281157

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I don't quite get the bug, that is what exactly makes the fox follow regions of denser triangles?

Basic probability - randomly walking a graph will tend to have you in regions of higher vertex density. Same reason why randomly picking a road intersection will tend to put you in cities - cities just have most of the intersections.

(the walk isn't exactly random but it still works - the pathing heuristic is real-coordinate agnostic).

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