BPatterns provide a fluent, Smalltalk-native API on top of the rewrite engine, using ordinary Smalltalk blocks as patterns.
Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
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题目要求与弹出条件的对应关系：
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