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.
Now that you know a little more about each tool, let's
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唐納德·特朗普在週二晚間發表了一場充滿戰鬥性的國情咨文報告，他宣稱美國正經歷「多年來最偉大的逆轉」（turnaround for the ages）。在民調顯示許多美國人對國家現況——以及特朗普的領導——感到不滿之際，美國總統並未透露任何改變路線的跡象。相反，他向全國進行了一場銷售推銷，對忠實支持者發出愛國號召，並嘲諷政治對手。