World/Udon Bugs & Feature Requests

I would like to request support for efficiently converting byte[] data into Unity struct arrays in Udon, such as: Color[] , Color32[] , Vector2[] , Vector3[] , Vector4[] Ideally, this would be similar in spirit to System.Buffer , but extended to support Unity struct arrays. ## Background Currently, converting raw byte[] data into Unity struct arrays in Udon is not straightforward. While it is technically possible through indirect approaches, these require many Udon steps and become inefficient when handling large datasets. In an actual 3D model loader currently in use, this process may need to handle hundreds of thousands of elements, such as around 300,000 entries. ## Proposal Please add a way for Udon to convert byte[] data into Unity struct arrays, similar in spirit to System.Buffer . For example: Vector3[] vertices = new Vector3[size]; UdonBuffer.TryBlockCopy(byteData, byteIndex, vertices); This would make it possible to directly convert binary data obtained from external sources (such as data fetched from the web) into Unity struct arrays in Udon, without workarounds.

I use an Oculus Quest 3S for my VRChat, and every time I attempt to put in a URL or watch a video it doesn't work. I've tried every method I can think of to fix or solve the issue, but none have worked. If you could please have it fixed for 3S and other VR users like me, that'd be amazing. I want to be able to watch videos on VRChat, but I can't if the video/media player situation remains unfixed. Thanks, have a great day/night

I would like to request support for passing values directly from uGUI to Udon, by providing public fields or properties in Udon for types commonly used by standard uGUI events. ## Background Currently, passing values from uGUI into Udon is not always straightforward. If the UI is static and predefined, this can be handled by assigning references from Udon to specific uGUI elements in advance. However, problems arise when UI elements need to be created dynamically. In my case, when dealing with such dynamic UI, I end up using workarounds such as: keeping references from uGUI to Udon, which still requires locating the relevant UI element from the Udon side identifying the calling object indirectly via MeshRenderer.probeAnchor (since Transform can be assigned from uGUI events) These approaches are technically possible, but they do not lead to a natural or scalable implementation. They often require indirect patterns or additional setup, especially when working with dynamically instantiated UI. Another possible approach is to attach a separate Udon behaviour to each UI element. However, using Udon components only to pass UI values introduces unnecessary overhead and does not scale well. ## Proposal I propose adding public fields or properties in Udon for types supported by standard uGUI events, such as: string (Input Field) bool (Toggle, ) int (Dropdown) float (Slider, Scrollbar) Vector2 (Scroll View) UnityEngine.Object This would allow a uGUI event to: write a value directly into a Udon behaviour call a CustomEvent let Udon read the value from the assigned input field or property ## Why UnityEngine.Object should be included I would also like UnityEngine.Object to be supported. This would allow a uGUI element to pass a reference to itself, making it much easier for Udon to identify the source of the event. Compared to current indirect methods, this provides a more direct and understandable way to determine which UI element triggered the interaction. ## Example of the intended flow A typical flow would look like this: A uGUI event assigns a value to a Udon behaviour The same event calls SendCustomEvent The Udon behaviour reads the value and handles it Conceptually: using UdonSharp; using UnityEngine; public class UiReceiver : UdonSharpBehaviour { // These are assumed to be provided by Udon itself // public string InputString { get; set; } // public UnityEngine.Object InputObject { get; set; } public void _OnUiTriggered() { Debug.Log(InputString); if (InputObject != null) { Debug.Log(InputObject.name); } } }

Players and world creators would appreciate a new character controller for VRChat worlds. It should work mostly like VRChat's current character controller, but has a variety of improvements: Players can stand on moving platforms. Going upstairs and slopes is smoother. Players can get pushed around by the colliders. It's better at getting players unstuck from geometry. Udon has greater control over the character controller. ... And more!

I have encountered a problem related to Unity's DSP chain and Udon. I am planning to create an audio focused world, where I need to implement a custom DSP algorithm on audio that can respond to player behavior/controls in real-time. In the native Unity Mono framework, I can insert custom effects into the audio DSP chain by implementing the OnAudioFilterRead method in MonoBehaviour (see https://docs.unity3d.com/ScriptReference/MonoBehaviour.OnAudioFilterRead.html ). In the UdonSharp documentation, I found that there is a method stub for OnAudioFilterRead in Unity events (see https://udonsharp.docs.vrchat.com/events/ ), so I should be able to implement it. However, it does not work in my Unity setup. I also saw a post on Canny mentioning that a component called OnAudioFilterReadProxy should be automatically added to the object if OnAudioFilterRead is implemented (See: https://vrchat.canny.io/udon/p/order-of-onaudiofilterreadproxy ), but this is not happening on my end. Any idea what could be going wrong with my script or configuration? Or it is a bug? My test code is like the following: using UdonSharp; using UnityEngine; using VRC.SDKBase; using VRC.Udon; public class SimpleSineGenerator : UdonSharpBehaviour { [SerializeField, Range(0, 1)] private float amplitude = 0.5f; [SerializeField] private float frequency = 261.62f; private double phase = 0; private double sampleRate = 48000; public void Update() { // verify that the script is running transform.Rotate(Vector3.up, 90f * Time.deltaTime); } public void OnAudioFilterRead(float[] data, int channels) { // DSP code double phaseIncrement = 2 * Mathf.PI * frequency / sampleRate; for (int i = 0; i < data.Length; i += channels) { phase += phaseIncrement; if (phase > 2 * Mathf.PI) { phase -= 2 * Mathf.PI; } float value = amplitude * Mathf.Sin((float)phase); for (int j = 0; j < channels; j++) { data[i + j] = value; } } } }

gets if local player is has moderation perms (ie: world creator, instance creator, group moderator). I want my moderator room to available to members of any group that visits my world, as opposed to a static whitelist which unfairly favors my group's moderators (for clarification: by "moderator room" I mean "a small private meeting room used by moderators to have private conversations without having to leave the instance")

A simple few bools that would add IsDesktop, IsPCVR & IsQuest to the VRCPlayerApi class. This would make life a lot better for world creators.

VRChat is working on an improvement to Udon, VRChat's scripting system. Currently, World creators can write code in two different ways: Udon Graph UdonSharp VRChat is introducing a third way: Soba Creators can write Soba scripts in C#, similar to UdonSharp. Soba scripts are compiled to Microsoft's Common Intermediate Language (CIL). This allows Soba to use a variety of features that are not available in the Udon Graph or UdonSharp.

Calling GetComponent on a GameObject that has a child with a VRCStation component attached throws the following error: [UdonSharp] Packages/com.vrchat.worlds/Integrations/UdonSharp/Runtime/Libraries/CompilerInternal/GetComponentShim.cs(25,30): Udon runtime exception detected! An exception occurred during EXTERN to 'VRCUdonCommonInterfacesIUdonEventReceiver.__GetProgramVariableType__SystemString__SystemType'. Object reference not set to an instance of an object

The DataDictionary.GetKeys function allocates a new DataList to contain the list of keys; as this is the only way to iterate a DataDictionary, this forces allocation pressure to occur every time a DataDictionary is iterated. Please provide a way to avoid this allocation - perhaps have an overload where you can pass in a DataList?