它们就像是 iPhone 伸出来的三根触角，疯狂地从物理世界汲取信息。
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Hit "Run" to watch particles bounce around with quadtree-accelerated collision detection:
This article originally appeared on Engadget at https://www.engadget.com/mobile/nato-approves-the-iphone-and-ipad-for-classified-use-200857276.html?src=rss
We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.