# 3.3.10: Cross Section Selector

The component **“CroSecSelect”** deals with selecting cross sections by name or index from a list of cross sections. Provide the name(s) or index(es) of desired cross sections in the **“Name|Ind”**-plug. Cross section names are not case sensitive. All characters coming after “#” count as remark. It is possible to use regular expressions for selection (these start with “&”). List indexes start from zero.

**“CroSecSelect**” lets you specify beams via the **“Elems|Ids”**-plug which shall be assigned a specific cross section. The **“Assemble”**-component sets the cross-sections of these elements accordingly. Alternatively, cross sections can be directly plugged into the element-creation-components.

In case one does not supply a list of cross sections at the **“CroSec”**-input-plug, the cross section table that comes with Karamba3D is used by default.

![Fig. 3.3.10.1: Cantilever with four different cross sections taken from the standard cross section table](/files/-M9XuTzAX4YKWxPG-RUQ)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://manual-1-3.karamba3d.com/3-in-depth-component-reference/3.3-cross-section/3.3.10-cross-section-selector.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.