Udon

Udon allows players to interact with your world in interesting ways! Use scripts written by other creators, or create your own games, prefabs, and other experiences.

What is Udon?

Udon is a programming language¹ for VRChat worlds. Scripts can interact with scene objects, players, synced networked variables, and more. Udon makes your world come to life!

Udon runs in both VRChat and the Unity Editor. You can test and debug your scripts without needing to build and upload your VRChat world. You can also use Udon's debugging features.

After you create your VRChat world, there are two main ways to create Udon scripts:

• The Udon Node Graph is a visual programming interface that uses nodes and wires to connect flow, inputs, and outputs.
  • The Graph is similar to Unity animators, Blender shaders, geometry nodes, or Unreal blueprints.
  • The Graph is unique to the VRChat SDK does not require any third-party tools.
  • Use the Graph if you're very new to programming or only want to create very simple scripts.
• UdonSharp allows you to use C# to create scripts.
  • UdonSharp is similar to Unity's built-in C# scripting system.
  • Most UdonSharp users use an IDE like Visual Studio or Rider.
  • Use UdonSharp if you're already familiar with programming or want to create powerful scripts.

And if you're an expert user:

• You can write your own compiler to generate Udon Assembly code.
  • VRChat Udon is technically a virtual machine running bytecode compiled from Udon Assembly.
  • You can write Udon Assembly code manually, though this is extremely uncommon.

Bug Reports and Feature Requests

To submit bug reports or feature requests, use VRChat's Canny feedback board.

Footnotes

1. For the more technically inclined: VRChat Udon is a VM running bytecode compiled from Udon Assembly. You can generate Udon Assembly using the built-in VRChat Udon Node Graph UI, writing your own Udon Assembly, or even by writing your own compiler to generate Udon Assembly or bytecode programs directly. ↩