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.
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
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BBC事實查核（BBC Verify） 對這些說法進行了核實。
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The Pentagon Feuding With an AI Company Is a Very Bad Sign
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