# Unity SDK — Markerless Mocap for Unity

The AR 51 Unity SDK connects a Unity project to the AR 51 system to receive live skeleton and object-tracking data, drive humanoid characters in real time, and build desktop, VR, and interactive motion-capture experiences. This page covers installing the plugin and configuring the connection; the rest of this section covers adding characters, VR platforms, object detection, and the service API.

After completing this guide, your Unity project will be connected to a running AR 51 service and ready to receive live skeleton and object-tracking streams.

![An AR 51 motion-capture skeleton driving a 3D character live inside the Unity editor](./img/unity-mocap-dark.webp)

## AR 51 Unity SDK Helper GPT

Need help writing Unity C# code with the AR 51 SDK or debugging your setup?

[Open the AR 51 Unity SDK Helper GPT](https://chatgpt.com/g/g-6a15a27260e481919a020afcffa39ba8-ar-51-unity-sdk-helper)
[View starter prompts](./07-sdk-helper-gpt.md)

The helper can assist with Unity setup, character setup, confirmed SDK APIs, service connection, object detection, controller input, and troubleshooting.


## Next steps

- [Connect Unity to AR 51](/docs/unity-sdk/connecting)
- [Add a character](/docs/unity-sdk/add-character)
- [Use object detection](/docs/unity-sdk/object-detection)
- [Review the SDK & API reference](/docs/sdk-api/overview)
- [See what's new — Unity SDK release notes](/docs/release-notes/unity-sdk)