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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Responding to questions as to why costs were allowed to spiral for so long, an NHS spokesperson said the length of time it takes public sector organisations to procure contracts "can vary", and the nature of the contract was "complex".
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