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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Number (2): Everything in this space must add up to 2. The answer is 2-1, placed horizontally; 1-6, placed vertically.，这一点在新收录的资料中也有详细论述
I sometimes changed the ground texture and was too lazy to rerender all the images, so please excuse this inconsistency in the images.，详情可参考新收录的资料
Source: Computational Materials Science, Volume 266
'relpages', 123513::integer,，这一点在新收录的资料中也有详细论述