The tree is rebuilt every frame. For scenes of this scale, quadtree construction is fast enough to rebuild from scratch each frame, though larger simulations may benefit from incremental updates. Each particle queries its neighborhood for potential collisions, typically checking only 5 to 15 candidates instead of all 40. Red highlights indicate colliding pairs.
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It's kitted out with CCTV cameras, allowing the team to monitor the animal's behaviour.
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Both countries blamed the other for not engaging seriously in diplomacy.