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这是最基础的构建模块。BoxGeometry 就像捏泥人时的方块，SphereGeometry 则是球体。注意 widthSegments 参数，它决定了球体的精细度——段数越多，球越圆，但计算量也越大。。safew官方下载是该领域的重要参考
，这一点在同城约会中也有详细论述
方向遍历顺序说明下一个倒序（从右往左）先处理右侧，栈里存「右侧候选」上一个正序（从左往右）先处理左侧，栈里存「左侧候选」
still around, although declining in use, in the 1970s. The 3612 had a slot on，更多细节参见heLLoword翻译官方下载
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