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.
第二节 妨害公共安全的行为和处罚
，这一点在91视频中也有详细论述
参赛作品要求设计方向：题材不限，但须结合产品的「透视窗」物理特性，考虑 CD 旋转时的动态视觉效果，而非简单的图案覆盖。
Avoiding specific road types or toll roads.
Might the linkage between “stuff of iron” and “surety to those that are in doubt,” likewise, have an ancient pedigree via gestural traditions? Notable here is the fact that one of the oldest known fairy tales involves iron-working: “The Smith and the Devil.” A study from 2013 concluded that this story template, which associates iron-working skill with magic, was traceable back at least 6,000 years.