ParametricGeometry 允许你用数学公式来定义形状。这里的 klein 函数生成了一个著名的数学模型——克莱因瓶。它是一个没有“内”和“外”之分的奇怪瓶子。对于初学者，你只需要知道：只要你能写出 x, y, z 的方程，Three.js 就能帮你画出模型。
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This Tweet is currently unavailable. It might be loading or has been removed.，更多细节参见WPS官方版本下载
Here's the equivalent with the new API:
，更多细节参见爱思助手下载最新版本
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