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.
萨吉德·阿克拉姆拾起了另一支枪，并与儿子一起再次朝光明节活动方向射击。
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方法一：iOS 主工程处理转换