OSC

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OSC is a way to get different devices and applications to talk to each other. VRChat announced on February 16th 2022 OSC for avatars. Most commonly used to have body-, eye- and face trackers communicate with VRChat.

OSCQuery

OSCQuery is a protocol to connect OSC applications together easier. Information on how to connect with VRChat with OSCQuery is available on the VRChat OSCQuery GitHub Wiki. VRChat also provides a C# library on GitHub.

Some of the community made OSCQuery libraries:

• TypeScript with example scripts on GitHub by Jangxx - node-oscquery.
• Python with examples on the GitHub readme.md - vrchat_oscquery. An older variant that's more descriptive - tinyoscquery.
• Rust implementation with baseline functionality - oscquery.

OSC feature set

OSC can control a multitude of things within VRChat. While primarily focused around avatars OSC has the ability to modify/control some features such as control of the Camera Dolly check out the implementation on the Dolly's OSC Integration page.

Parameters such as "input/Voice" can be controlled by sending "True" switches the current state of your microphone (Muted to Unmuted), Sending "False" has no action.

Chatbox input can be accessed under "/chatbox/input".

OSC ports

VRChat uses two UDP ports for OSC communication on localhost (127.0.0.1):

Port	Direction	Purpose
9000	Send → VRChat	Your application sends messages to VRChat
9001	Receive ← VRChat	Your application receives messages from VRChat

Resources

• OSC Overview on the VRChat Documentation
• Full OSCQuery proposal and how it functions while including example code