> For the complete documentation index, see [llms.txt](https://manual-1-3.karamba3d.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual-1-3.karamba3d.com/3-in-depth-component-reference/3.1-model/3.1.5-activate-element.md).

# 3.1.5: Activate Element

The activation state of an element can be controlled with the **“Activate Element”**-component (see fig. 3.1.5.1). This component expects a model and a list of boolean values as input. The list of true/false values will be mapped to the activation status of the elements in the model. **“True”** corresponds to active, **“False”** to inactive. Section [3.5.9](/3-in-depth-component-reference/3.5-algorithms/3.5.9-beso-for-beams.md) shows, how the **“Activate Element”**-component enables one to view the solution history of the iterative **“BESO for Beams”**-algorithm.

{% hint style="info" %}
Karamba3D sets elements inactive by giving them a very weak material with zero weight.
{% endhint %}

![ Fig. 3.1.5.1: Setting the activation state of all elements of a model with a list of boolean values.](/files/-M9XuVde0v7LL3u1_5Nw)