Udon
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Udon is a C# derived high level object-oriented programming editor for the VRChat World SDK, created by the VRChat Development Team and released in 2018 for SDK2, then eventually SDK3. You can code traditionally using UdonSharp (U#) which allows the use of limited C# syntax, or utilize the Udon Node Graph UI for visual scripting using 'noodles' to connect nodes together. Udon also compiles to its own bytecode known as Udon Assembly which can be interpreted by the VRChat platform.
Udon is primarily used as a replacement for MonoBehaviors in Unity. Udon is designed to securely interface with the VRChat platform in a sandboxed environment with a select set of approved operations to perform various actions that can optionally be synced across the network. Udon covers a wide range of native C# and Unity operations as well as VRChat specific operations that can be used to build advanced worlds and experiences in VRChat.
History
Udon Toolkit was originally announced on a blog post[1] on June 20, 2018 and introduced as the "VRChat Node Graph", and was additionally discussed during a Developer Update video[2] on June 26, 2018 to replace the 'Playmaker' toolkit on early versions of the World SDK.
Udon officially launched on April 1, 2020 in Open Alpha. Users could upload worlds to VRChat using Udon Scripts. [3]
Official resources
What is Udon? on creators.vrchat.com- UdonSharp Docs on creators.vrchat.com
- World/Udon Bugs & Feature Requests on feedback.vrchat.com
Community resources
A list of community resources can be found in its main article: Community: Udon Guides
