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.
copyright dates they must have been around by 1977.
面对许多仍然需要跨越的“雪山”“草地”、需要征服的“娄山关”“腊子口”，习近平总书记的殷殷告诫振聋发聩——，更多细节参见Line官方版本下载
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And, although it is difficult to find references to knocking wood for good luck before the nineteenth century, it turns out that this is not the case for touching iron — the “tocca ferro” of Italy, shown above.