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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.，详情可参考旺商聊官方下载
uint8_t *buffer = (uint8_t *)[data mutableBytes];。safew官方下载是该领域的重要参考
Sellfy Review: Pros and ConsSellfy has its benefits and downsides, but fortunately, the pros outweigh the cons.