我有一个 csv 文件，其中包含曲面的 $x$、$y$ 和 $z$ 值。我试图隔离所有等于零的 $z$ 值，并使用 tikzpicture 和 pgfplots 仅将它们绘制为轮廓。如何实现这一点？当查看此问题，我本想尝试更改该addplot3部分addplot，希望它只绘制二维图上列出的轮廓，但事实并非如此。如果我们使用下面该问题提供的数据，我将如何根据数据绘制单个轮廓
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