It isn’t just celebrities like George Clooney packing up for France. Places like Portugal, Spain, and the Netherlands have seen American expat populations double lately, and Germany and Ireland both received more American arrivals last year than the other way around.
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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.