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.
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利文斯通被大象冲撞而亡的当地向导，曾买下一幅大象肖像照挂在家里，拍摄地点正好就是他后来遇难的地方。 摄影 张海律