World/Udon Bugs & Feature Requests

If U# scripts with BehaviorSyncMode.Manual (or Continuous) and None set exist in the same object, an error will occur as shown in the attached image. (When SC2 Input Manager is None and SC2 Seat Adjuster is Manual) When combining Manual (or Continuous) and None, it would be nice if U# scripts behaved as synchronization objects without displaying any error-like messages. In fact, this combination works as Manual Sync. Looking at the archive logs below, it seems that this implementation is already in place, and the error message is just being displayed extra. https://feedback.vrchat.com/udon/p/syncmode-none-should-be-weaker-than-other-sync-modes

## Problem Media files can contain multiple audio tracks (for example Spanish, English and Japanese), but worlds using VRCAVProVideoPlayer cannot enumerate or select those tracks from Udon. The player chooses one track and world authors have no supported way to change it. This prevents proper multilingual cinema, anime, karaoke, event and accessibility experiences. Current workarounds require duplicating the full video, transcoding variants on a server, or running a second audio player and fighting synchronization. AVPro itself has audio-track APIs, but the VRChat wrapper does not expose equivalent functionality to Udon: https://www.renderheads.com/content/docs/AVProVideo-v3/api/RenderHeads.Media.AVProVideo.VideoPlayer_AVPro.html VRChat video-player documentation: https://creators.vrchat.com/worlds/udon/video-players/ ## Requested API Please expose a small, local API on VRCAVProVideoPlayer, with names similar to: int GetAudioTrackCount() string GetAudioTrackLanguage(int trackIndex) string GetAudioTrackName(int trackIndex) int GetSelectedAudioTrack() bool SetAudioTrack(int trackIndex) An event indicating that track metadata is available would also be useful. The exact API names are not important. The important requirements are that Udon can enumerate the available tracks, show their language/name, and select one. ## Behaviour Audio-track selection should be local by default, so different users in the same instance can listen to different languages while watching the same synchronized video. Changing track should not change the shared URL, playback state or time for other users. Switching during playback should preserve the current playback position. If the backend must pause or reopen the media, the SDK could handle that internally or document the required sequence. A capability check is acceptable when a platform or media backend does not support track switching. PC-only support initially would still be useful if cross-platform parity is not immediately possible. ## Acceptance example A world plays one media URL containing Spanish, English and Japanese audio tracks. Two users watch the same synchronized video at the same timestamp. User A selects Spanish locally. User B selects Japanese locally. The video remains synchronized and neither user's choice changes the other user's audio. This would enable true multilingual playback without storing or streaming duplicate copies of the video.

At the moment Udon doesn't have this library exposed to Udon. Considering how easy is to tamper with String Loading (DNS poisoning and you are gucci), having this exposed to validate response signatures is required.

When pointing at a canvas, a little arrow appears. It would be nice if we could get the 2D coordinates of that arrow within the canvas, without having to worry about determining what input/raycast method generated it. In theory Unity has plenty of ways of doing this, but I don't know of any of them that are exposed to UdonBehaviour. (The closest that I've gotten is to cover the canvas in a giant slider, which at least gives you the X coordinate of any clicks on the canvas, but trying to add a second rotated slider to get the Y coordinate just covers up the X one...)

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.

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!

Greetings, I'd like to have write access to UnityEngine.BoneWeight data structures from Udon. https://docs.unity3d.com/ScriptReference/BoneWeight.html The reaons is that : I'm currently making a 3D Model Loader using Udon#. https://github.com/vr-voyage/vrchat-glb-loader So far, I've been able to reproduce 3D models included in GLB and VRM files (GLTF) correctly. However, I cannot recreate the armature due to Udon not being able to access the members of the BoneWeight structure. While this is not a showstopper, as I can always try to do GPU skinning using solutions like ShaderMotion ( https://gitlab.com/lox9973/ShaderMotion ), I'd like to avoid any workaround as much as possible and have direct access to that data structure.

Log the bool "value" argument for InputUse. Click your mouse and release. Expected: receive "True" once, receive "False" once Actual:

Adding an empty animation event to an animation causes build & test to crash It would be nice to show a warning under Review any alerts in the SDK builder when any animations events are not valid

% operator (Remainder operator) is not exposed to Udon. This makes some operations impossible! I can't believe that this has been neglected since 2020. (I know https://feedback.vrchat.com/udon/p/long-remainder but it has been neglected since 2020 so I created new issue.)