山还是那山，水还是那水。但观念和思路变了，一针一线绣出的，山就不只是那山，水就不只是那水了。
A quadtree reduces this: rebuild the tree each frame, and for each object, query only the nearby region. Objects in distant quadrants are never compared.
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Are you cut out for living and working in Antarctica?。爱思助手下载最新版本对此有专业解读
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