# 3.8.16: 用户等参线和流线 (User Iso-Lines and Stream-Lines)

![图3.8.16.1：用户定义的矩形壳体贴片上的等参线（红色）和流线（绿色）。](/files/-M9XuXA4MWtbWVBvKAQG)

{% hint style="info" %}
定义“User\_Iso\_Lines.gh”可在Karamba3D安装文件夹中的“..-Examples/TestExamples/”下找到。双击Karamba3D桌面图标。
{% endhint %}

**“User Iso-Lines（用户等参线）”**和**“User Stream Lines（用户流线）”**这两个运算器的工作原理分别类似于**“IsoLines（等参线）”**（请参见第[3.6.12](/chinese_1_3_3/3-in-depth-component-reference/3.6-results/3.6.12-line-results-on-shells.md#isolines-on-shells)节）和**“Principal Stress Lines on Shells（壳体上的主应力线）”**运算器（请参见第[3.6.12](/chinese_1_3_3/3-in-depth-component-reference/3.6-results/3.6.12-line-results-on-shells.md#principal-stress-lines-on-shells)）。唯一的区别在于，需要为模型的每个节点（还包括仅连接至梁的节点）提供与该流线相切的值（输入端口**“Vals”**）或量（输入端口**“TVecs”**）。


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