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.
AP Business Writer Claire Savage in Chicago contributed to this report.
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Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.