World/Udon Bugs & Feature Requests

Ever since I went ahead to update my world with the latest update in mind (SDK 3.9.1-beta.1], anyone trying to join it will receive an "Unusual Client Behavior" and be kicked out of the world immediately. I tried to delete any changes done in the world in the hope to pinpoint the problem but the problem still occurred and even after downgrading to SDK 3.9.0 it still gives the error. If it helps to solve the issue, I noticed that messing with my PlayerObject pool (despite the fact I have not touched it once for the update) and removing then adding back some object prevented the error from showing up. Alas when I decided to arrange it after I noticed some script were broken with the newer PlayerObject setup in the world that fixed the error, the error showed up again, even when I used the backup scene I saved that worked before, that one ALSO DIDN'T WORK. This is the world currently being affected by this issue : https://vrchat.com/home/world/wrld_37abea33-f34c-4706-8e6b-2f69e414fc5d/info I have tried everything to see if the problem came from my world but the problem feels way too random for it to be the case.

I tried this both with udon graph and udon sharp. Both times, when calling the Respawn function, the udon script throws an error and halts. It says that the reference is not set to an instance of an object, even though every time, I check, and there is an object with a VRCObjectSync attached to it that Respawn() is called from. And Respawn() is called from the VRCObjectSync, and not the GameObject. This is the error I get from udon graph: [UdonBehaviour] An exception occurred during Udon execution, this UdonBehaviour will be halted. VRC.Udon.VM.UdonVMException: The VM encountered an error! Exception Message: An exception occurred during EXTERN to 'VRCSDK3ComponentsVRCObjectSync.__Respawn__SystemVoid'. Parameter Addresses: 0x00000000 Object reference not set to an instance of an object ---------------------- Program Counter was at: 28 ---------------------- Stack Dump: ---------------------- Heap Dump: 0x00000000: Microphone (VRC.SDK3.Components.VRCObjectSync) 0x00000001: Microphone (VRC.SDK3.Components.VRCObjectSync) 0x00000002: VRCSDK3ComponentsVRCObjectSync.__Respawn__SystemVoid ---------------------- Inner Exception: ---> VRC.Udon.VM.UdonVMException: An exception occurred during EXTERN to 'VRCSDK3ComponentsVRCObjectSync.__Respawn__SystemVoid'. Parameter Addresses: 0x00000000 ---> System.NullReferenceException: Object reference not set to an instance of an object at VRC.SDK3.ClientSim.ClientSimObjectSyncHelper.RespawnObject (VRC.SDK3.Components.VRCObjectSync sync) [0x00000] in .\Packages\com.vrchat.worlds\Integrations\ClientSim\Runtime\Helpers\ClientSimObjectSyncHelper.cs:18 at VRC.SDK3.Components.VRCObjectSync.Respawn () [0x00009] in <6ff4ff48394b436282bb70dc0ff277c2>:0 at VRC.Udon.Wrapper.Modules.ExternVRCSDK3ComponentsVRCObjectSync.__Respawn__SystemVoid (VRC.Udon.Common.Interfaces.IUdonHeap heap, System.Span`1[T] parameterAddresses) [0x0001d] in <b001fa9908f1453c979dae8b67f4c4f7>:0 at VRC.Udon.VM.UdonVM.Interpret () [0x00273] in <62e4a0d35446446b8fa1f8e5755bcfaa>:0 --- End of inner exception stack trace --- at VRC.Udon.VM.UdonVM.Interpret () [0x0033c] in <62e4a0d35446446b8fa1f8e5755bcfaa>:0 --- End of inner exception stack trace --- at VRC.Udon.VM.UdonVM.Interpret () [0x00436] in <62e4a0d35446446b8fa1f8e5755bcfaa>:0 at VRC.Udon.UdonBehaviour.RunProgram (System.UInt32 entryPoint) [0x00063] in .\Packages\com.vrchat.worlds\Runtime\Udon\UdonBehaviour.cs:1098 UnityEngine.Debug:LogError (object,UnityEngine.Object) VRC.Core.Logger:LogError (string,string,UnityEngine.Object) VRC.Udon.UdonBehaviour:RunProgram (uint) (at ./Packages/com.vrchat.worlds/Runtime/Udon/UdonBehaviour.cs:1112) VRC.Udon.UdonBehaviour:RunEvent (string) (at ./Packages/com.vrchat.worlds/Runtime/Udon/UdonBehaviour.cs:1306) VRC.Udon.UdonBehaviour:ManagedUpdate () (at ./Packages/com.vrchat.worlds/Runtime/Udon/UdonBehaviour.cs:551) VRC.Udon.UdonManager:Update () (at ./Packages/com.vrchat.worlds/Runtime/Udon/UdonManager.cs:354)

There are issues with trolls loading into a world with an avatar that VRChat's logs report like this: Error - [AssetBundleDownloadManager] Avatar 'avtr_becb0302-64b5-47b3-ab0d-2a0dcbdef294' did not pass initial checks and won't be downloaded: AssetBundleBadPerformance The users are in the world able to listen in on conversations and manipulate objects like the image loader, but have no physical presence in the userlist for any active moderation. VRChat should not permit any user in a world with an invalid avatar like this. At the moment since their names and avatars are getting logged, I'm seeing if there are anti-troll measures that can be taken against such users and logging/reporting more verbose information. But to prevent them from actually causing harm in the world, I'd need to work with world creators to develop our own anti-troll systems to ensure such malicious hackers do not interrupt events. In this case, they disrespected people sharing stories about their loved ones who passed away during Dia de Muertos. That was disrespectful to the highest degree and they have been banned from the group. I've already reported the user and sent all my info to VRChat's ToS team for investigation so they do not cause harm to anyone else. This isn't just a bug, this is a signficant security risk.

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!

Over the past few days, I’ve received multiple reports from Quest 2 players saying that VRChat crashes while loading my world Jetski Rush ( https://vrchat.com/home/world/wrld_2ad5bb30-adf7-4de1-ba50-ae9b6b4689fe/info ). There’s no error message, the client just closes during the loading screen. I haven’t updated the world recently, and it was working fine before. I tried to reproduce the issue myself but wasn’t able to. The world loads and runs normally for me and several other players. We don’t have access to the logs from affected users, so it’s difficult to pinpoint the cause. It might be related to a recent VRChat update, since the crashes only started happening recently without any changes on our side.

What I'm going to describe is a very niche bug, that won't bother a lot of people, but it's been preventing me from porting some cool worlds like "Thad Recursive Room" to Quest, because it relies on some render tricks with multiple cameras. If you have a camera without a render target, it will render on screen. And if you set the "depth" parameter greater than 0, it will render after the main camera, effectivly acting like an overlay camera. So far, everything works. But doing that with more than 1 camera does not work. So if you use a second camera with an even higher depth value, it's content won't show up on the screen as long as the first overlay camera is still on (That is, if the content of the second overlay camera is actually performing a z test). But it gets stranger from here: if I open and close the menu a few times and also click on some of the menu tabs like the world menu. Every now and then it causes a glitch that will make the content of the second overlay camera sort of appear from there on out. What I can see then, is that when I move my head, it moves away an invisible shape that was blocking the content of the second overlay camera. And that shape fits perfectly the object it is supposed to render. It is as if the z values of the second overlay camera are already written to the depth buffer before the actual rendering of the second overlay camera begins and then the z test fails against its own values. But after the menu glitch, the occluding depth image seems to be frozen in place and I can partly move it out of the way by changing my view. Also: one time I tried something similar with cameras rendering before the main camera (depth parameter is set to a negative value, and main camera is set to clear nothing). Results were similar, and after I managed to get something visible with the menu glitch, it appeared as if the cameras that render earlier than the main camera were very pixelated, which was also surprising. I've been also experimenting with manually calling render() on multiple cameras that are supposed to render on screen during several render related events (for example in OnPostRender of the first overlay camera), but no luck getting their content to show in any way.

There is a component named "OnAudioFilterReadProxy" which will be added automatically when I expose OnAudioFilterRead in my UDON code. Currently, this component is added at the end of the components, but I would like this order to be after UdonBehaviour.

Adding vrchat.com or api.vrchat.cloud to the whitelist would allows world creators to access vrchats api. People could access things like the online user count, or total occupancy of the current world. we can already access assets.vrchat.com for loading images so why not string.

With the Remote string loading and image loading, we should be able to dynamically construct endpoint url's to cater to different scenarios and offer more flexibility. I know other posts about this do exist, but I feel like VRChat won't really pay attention without there being more volume and input from the end users. Please upvote relevant requests and share your thoughts. I'm using this post to potentially share my feedback and idea, and offer a starting point for us to discuss on. I want to be able to kickoff my project in VRChat and the string loading with dynamic URL's will play a major role in making it a reality. I am assuming this was not possible because of "security" concerns, but let's face it that we offer users to block untrusted URL's as is and give them warnings. VRChat is not only a social platform, but a sandbox for creators in terms of avatar, world, and scripting content. I've developed essential tools on Garry's Mod and other sandbox games, and they had no problem letting scripts make API calls, despite the community having a dangerous and toxic userbase. This allowed me to let my clients configure "roles" and preferences from an external web portal. Are you afraid of data exfiltration? There are ways to do that already. Malicious URL calls? Anything on the internet can be malicious as is. We can't keep having this "Carebear" security mindset and keep it locked tight that severely limits our creativity, but look for accountability and flexibility. The security concern is admired, but now its necessary to send dynamic URL's for search queries when we deal with remote strings or images, otherwise we have no choice but to dump the entire dataset. I will just have to create hundreds of VRCURL's and just do a bunch of if/else's and download the entire "database" instead of feeding search queries to get specific datasets to save bandwidth and filter through the data set on the server side. Maybe to meet in the middle, we can be transparent of the requests to be made. Add a prompt to the end user stating that "This World is requesting permission to let your game send/receive content to and from http://xyz.com " and it would be whitelisted to that user individually. Any new URL's not on the list will prompt another permission request. It would Only apply to the domain name, and Subdomain only. Maybe prevent changing the domain/subdomain of the URL entirely. This can also allow the user to feel more confidence knowing that their "Untrusted URLs" is no longer a wildcard, but can consult a list to see which untrusted URL's they're permitting on their client. With your upcoming "Udon" menu implementation, it could be considered to have VRChat built-in user preferences specific to the worlds, and include the whitelist there of URLs the World has requested to communicate with.