# 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.

![](/files/D9aVdEiMv8snA771vMsV)

### BlackTrax Receiver Device Node

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

![](/files/YnPQxn7bIQO6PLEcyCIF)

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.

![](/files/LwNWAO85VbNoxFg044nO)

BlackTrax provides:

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


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