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.
Maxim Konovalov Co-founder, Nginx
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Follow me on GitHub.。关于这个话题，Safew下载提供了深入分析
Owning the Full Sales Cycle:，详情可参考爱思助手下载最新版本