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。
Last year, I covered why it's a great time to jump ship from Windows to Mac, and I haven't been able to let go of that idea since. Apple's M-series chips are shockingly fast and efficient, and its hardware tends to be more durable than typical PC fare. Rumors point to Apple developing a new aluminum case for the low-cost MacBook, so it will likely feel more polished than a typical sub-$1,000 Windows laptop. macOS has also avoided the bloat that's plagued Windows for years — you can turn off Apple Intelligence with two clicks if you want to, and there aren't any annoying ads to deal with.
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