ARParticipantManager.cs
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using System;
using System.Collections.Generic;
using UnityEngine.XR.ARSubsystems;
namespace UnityEngine.XR.ARFoundation
{
/// <summary>
/// A manager for <see cref="ARParticipant"/>s. Creates, updates, and removes
/// <c>GameObject</c>s in response to other users in a multi-user collaborative session.
/// </summary>
[DefaultExecutionOrder(ARUpdateOrder.k_ParticipantManager)]
[DisallowMultipleComponent]
[RequireComponent(typeof(ARSessionOrigin))]
[HelpURL("https://docs.unity3d.com/Packages/com.unity.xr.arfoundation@3.0/api/UnityEngine.XR.ARFoundation.ARParticipantManager.html")]
public sealed class ARParticipantManager : ARTrackableManager<
XRParticipantSubsystem,
XRParticipantSubsystemDescriptor,
XRParticipant,
ARParticipant>
{
[SerializeField]
[Tooltip("(Optional) Instantiates this prefab for each participant.")]
GameObject m_ParticipantPrefab;
/// <summary>
/// (Optional) Instantiates this prefab for each participant. If <c>null</c>, an empty <c>GameObject</c>
/// with a <see cref="ARParticipant"/> component is instantiated instead.
/// </summary>
public GameObject participantPrefab
{
get { return m_ParticipantPrefab; }
set { m_ParticipantPrefab = value; }
}
/// <summary>
/// Invoked when participants have changed (been added, updated, or removed).
/// </summary>
public event Action<ARParticipantsChangedEventArgs> participantsChanged;
/// <summary>
/// Attempt to retrieve an existing <see cref="ARParticipant"/> by <paramref name="trackableId"/>.
/// </summary>
/// <param name="trackableId">The <see cref="TrackableId"/> of the participant to retrieve.</param>
/// <returns>The <see cref="ARParticipant"/> with <paramref name="trackableId"/>, or <c>null</c> if it does not exist.</returns>
public ARParticipant GetParticipant(TrackableId trackableId)
{
if (m_Trackables.TryGetValue(trackableId, out ARParticipant participant))
return participant;
return null;
}
protected override GameObject GetPrefab()
{
return m_ParticipantPrefab;
}
protected override void OnTrackablesChanged(
List<ARParticipant> added,
List<ARParticipant> updated,
List<ARParticipant> removed)
{
if (participantsChanged != null)
{
participantsChanged(
new ARParticipantsChangedEventArgs(
added,
updated,
removed));
}
}
/// <summary>
/// The name to be used for the <c>GameObject</c> whenever a new participant is detected.
/// </summary>
protected override string gameObjectName
{
get { return "ARParticipant"; }
}
}
}