Last reviewed 30 Apr 2026
Applies to
UdonSharp VRChat Worlds SDK
Difficulty Beginner

Instance Master Toggle

Allow only the current instance master to toggle a shared object.

Category: Networking Systems

UdonSharp Script

using UdonSharp;
using UnityEngine;
using VRC.SDKBase;
using VRC.Udon;

public class InstanceMasterToggle : UdonSharpBehaviour
{
    public GameObject targetObject;
    [UdonSynced] private bool isVisible = true;

    private void Start()
    {
        ApplyState();
    }

    public override void Interact()
    {
        VRCPlayerApi localPlayer = Networking.LocalPlayer;
        if (localPlayer == null || targetObject == null) return;
        if (!Networking.IsMaster) return;

        Networking.SetOwner(localPlayer, gameObject);
        isVisible = !isVisible;
        ApplyState();
        RequestSerialization();
    }

    public override void OnDeserialization()
    {
        ApplyState();
    }

    private void ApplyState()
    {
        targetObject.SetActive(isVisible);
    }
}

License:

Setup

  1. Add script to interactable button.
  2. Assign targetObject.
  3. Test with two users and switch master to verify behavior.

Extra Tips and Troubleshooting

Tips and Tricks

  • Use master-only controls for lightweight live operations.
  • Add visible hint text that only master can use the control.

Troubleshooting

  • If interaction fails, test with current master and verify master transfer behavior.

Related Content

Prefab Setup Notes

Import the prefab or script into a throwaway test scene before adding it to a live world. Confirm inspector references, ownership behavior, sync, triggers, UI hooks, and audio or object links before moving it into the production scene.

Testing Checklist

  • Test once as a local player and again with a second client or late joiner if the behavior can affect more than one player.
  • Confirm ownership, sync, trigger zones, UI references, and audio or object references are assigned intentionally.
  • Check desktop and VR interaction distance so players can actually use the feature in context.
  • Keep a backup of the scene before changing prefabs, UdonBehaviours, or serialized references.

Related Pages

Official References