# OptiTrack (NatNet)

LightAct offers 2 ways of connection with the OptiTrack server. The first type is **Auto-detect** where LightAct will find OptiTrack servers on the network so you can choose one of them in **Discovered servers** dropdown menu. The second option is to manually set the server parameters if **Auto-detect** is unchecked.

{% hint style="info" %}
**Good to know**: OptiTrack integration relies on NatNet SDK, which is created and maintained by OptiTrack.
{% endhint %}

### OptiTrack Receiver Device Node

To start receiving OptiTrack data stream insert a **OptiTrack** **Receiver** device.

![Auto-detect OptiTrack servers](/files/qpHf8vpssKCvZghwZln5)

![Manually added OptiTrack server parameters](/files/uX7WOk4RxPZfH4bt0NrZ)

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.

### Read **OptiTrack** in Layer Layouts

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

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

![](/files/a1N7udO2XPj252DdVnaW)

Read Optitrack node provides **Rigid body position**, **Rigid body orientation** and **Marker position**.


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