Example of sending Virtual Tracker data to VRChat over OSC

OscTrackerSenderExample.cs

// This code is licensed under MIT license

using UnityEngine;

public class OscTrackerSenderExample : MonoBehaviour
{
    public float UserHeightInMeters = 1.7f;
    public string OscTargetIp = "127.0.0.1";
    public int OscTargetPort = 9000;
    public Transform HeadReference;
    public Transform[] Trackers = new Transform[8];

    // You must download and add OscCore to your project: https://github.com/vrchat/osccore/tree/all-in-one
    private OscCore.OscClient oscClient;

    /// This is the height of VRChat's default robot.
    /// You must adjust this to the standing height of the avatar
    /// in your scene used to produce a pose.
    private const float SENDER_AVATAR_HEIGHT = 1.87f;

    private float scaleFactor = 0.909091f; // (UserHeightInMeters / SENDER_AVATAR_HEIGHT)

    void Start()
    {
        scaleFactor = UserHeightInMeters / SENDER_AVATAR_HEIGHT;
        oscClient = new OscCore.OscClient(OscTargetIp, OscTargetPort);
    }

    private void OnValidate()
    {
        if (Trackers.Length > 8)
            System.Array.Resize(ref Trackers, 8);
    }

    void Update()
    {
        if (oscClient == null)
            return;

        if (HeadReference)
        {
            oscClient.Send("/tracking/trackers/head/position", HeadReference.position * scaleFactor);
            oscClient.Send("/tracking/trackers/head/rotation", HeadReference.eulerAngles);
        }

        for (int i = 0; i < Trackers.Length; i++)
        {
            if (Trackers[i])
            {
                /// Valid addresses will look like the the following
                /// where "1" can be a number between 1 and 8.
                /// Note: there is no tracker 0.
                /// "/tracking/trackers/1/position"
                /// "/tracking/trackers/1/rotation"
                oscClient.Send($"/tracking/trackers/{i + 1}/position", Trackers[i].position * scaleFactor);
                oscClient.Send($"/tracking/trackers/{i + 1}/rotation", Trackers[i].eulerAngles);
            }
        }
    }
}