> 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/integrations/camera-and-object-tracking/node-based-tracking-workflows/blacktrax.md).

# BlackTrax

LightAct offers 2 coordinate systems for BlackTrax, one is **Stage** and the other is **Screen**. You can choose which one you would like to use in device properties, under *Data* collapsible header.

![](https://3312042618-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9sVaJpWJhPbmscipukhh%2Fuploads%2Fgit-blob-608cc39dc57bc0992504029ab77495ce017a7698%2FBlackTrax%20coordinate%20system.png?alt=media)

### BlackTrax Receiver Device Node

To start receiving BlackTrax information insert a **BlackTrax Receiver** device.

![](https://3312042618-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9sVaJpWJhPbmscipukhh%2Fuploads%2Fgit-blob-6e36e71d781e4e77ae2dffa29070b422c5b8f854%2FBlackTrax%20device%20node.png?alt=media)

On the right side, under the *Stream*, configurable properties for specific devices will be shown. After you configure them, check **Listen** checkbox inside the device node.

{% hint style="warning" %}
If you are using **Tracking Adapter** app from CAST software, please make sure that **Acceleration and Velocity** filtering is disabled. Otherwise the positions of the beacons won't be detected.
{% endhint %}

### Read BlackTrax in Layer Layouts

To use the information read by *BlackTrax Receiver* device node in LightAct, you need to create a **Read BlackTrax** node in the layouts.

Choose **BlackTrax Receiver** device in a **Device** dropdown menu, or connect **Device reference** node to this input, and you are ready to go.

![](https://3312042618-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9sVaJpWJhPbmscipukhh%2Fuploads%2Fgit-blob-9a6d5480cb2c1534c52e87a0d4218379ab7b9b89%2FBlackTrax%20receiver%20layer%20node.png?alt=media)

BlackTrax provides:

* **Vec3s**: Position, Orientation, Acceleration and Velocity
* **Vec3 vectors**: LED Position, LED Acceleration and LEC Velocity