> For the complete documentation index, see [llms.txt](https://docs.lightact.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lightact.com/projection-mapping/iris/calibrating-optitrack-cameras-with-active-or-passive-markers.md).

# Calibrating OptiTrack cameras with active or passive markers

## Required components

### Cameras

<figure><img src="/files/IA9rqJXixAyrcLyLNFJv" alt=""><figcaption></figcaption></figure>

<p align="center"><em>For illustrative purposes only.</em></p>

OptiTrack Primex13 or Slimx13 camera.

{% hint style="warning" %}
Please note, if you are using Slimx13 camera, you can only use Active markers.
{% endhint %}

{% hint style="warning" %}
Please note, you need a separate OptiTrack license per every camera to be able to use this feature.
{% endhint %}

### Passive markers

<figure><img src="/files/pEx77th4mnjpqb3hicxH" alt=""><figcaption></figcaption></figure>

<p align="center"><em>For illustrative purposes only.</em></p>

Passive OptiTrack markers (only if you are using Primex13 cameras).

### Active markers

<figure><img src="/files/X70tKRWEYGNaGVc9KLx2" alt=""><figcaption></figcaption></figure>

<p align="center"><em>For illustrative purposes only.</em></p>

OptiTrack Active Tags with LEDs.

### Active BaseStation

<div align="center"><figure><img src="/files/ooeBw3EfD9TRdQcOJSQu" alt=""><figcaption></figcaption></figure></div>

<p align="center"><em>For illustrative purposes only.</em></p>

OptiTrack Active BaseStation is required if you are using Active Tags.

{% hint style="warning" %}
Please contact us before making a purchase.
{% endhint %}

### Accessories

* PoE Switch

## Installation of markers

The images below show an example of active and passive marker installation into a 3D print of a mask.

<div align="left"><figure><img src="/files/zNK9xBjrr7P8qhZSJ3aq" alt=""><figcaption></figcaption></figure></div>

<p align="center"><em>Front side.</em></p>

<div align="left"><figure><img src="/files/JEpYfHzxmmaUHTasrZ2q" alt=""><figcaption></figcaption></figure></div>

<p align="center"><em>Back side.</em></p>

## Hardware setup process

* Sometimes the firmware needs to be updated and Active Tags re-programmed (more info soon).
* Antivirus software may interfere with Motive's communication with the Markers

## Calibration process

Coming soon...