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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.
，这一点在搜狗输入法下载中也有详细论述
An update on SVG in GTK
Марина Совина (ночной редактор)
location: ${location name},