Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
Additional reporting by Jonathan Fagg, Patrick Hughes and James Pearson
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"Numbers have plummeted due to a myriad of different factors including over-abstraction, habitat degradation, pollution, impacts on redds, in-stream barriers, climate change, and pressures associated within the marine environment."