代码中定义了一个 primitives 对象，里面藏着 20 多种不同的几何体生成函数。让我们挑几个常用模型进行分析：
Per-jail resource control
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The ultimate goal, she says, is robots that are far more "graceful" than those of today. "Robots […] have this clunkiness and heaviness," she says, "which is so different from the way we move."，推荐阅读safew官方下载获取更多信息
int count[10] = {0}; // 0-9共10个桶，更多细节参见旺商聊官方下载