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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.，推荐阅读爱思助手下载最新版本获取更多信息
The bats soon begin to emerge, darting and swooping up and down the aisles, the amplified sounds of their bat chatter filling the historic building.
Landslide in Niscemi in January tore away entire slope of town and carved 4km chasm