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.
Almost 30,000 pieces of debris are calculated to be free-floating in space, created when rockets break up in space or satellites disintegrate.
，这一点在搜狗输入法下载中也有详细论述
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
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