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.
"It's incredibly energy-intensive and the birds use up to 50% of their body mass," he says.
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他在地上挣扎扭动，随后再也没有起身，袭击就此结束。
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，更多细节参见91视频
相机：观众的眼睛。这里用的是 PerspectiveCamera（透视相机）。
The writer has a simple interface: write(), writev() for batched writes, end() to signal completion, and abort() for errors. That's essentially it.，更多细节参见一键获取谷歌浏览器下载