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AudioLink

A repository of audio reactive prefabs for Unity, written in CSharp and HLSL, compatible with VRChat and ChilloutVR

AudioLink is a system that analyzes and processes in-world audio into many different highly reactive data streams and exposes the data to Scripts and Shaders.

The per-frequency audio amplitude data is first read briefly into Udon using Unity's GetOutputData. It is then sent to the GPU for signal processing and buffered into a CustomRenderTexture. Then, the CustomRenderTexture is broadcast globally (called _AudioTexture) which can be picked up by shaders both in-world and across all avatars.

Public example world

Frequently Asked Questions

Documentation for shader creators

2.0.0 - September 8th, 2024

New features

Changes

Bugfixes

Updating projects from version 0.2.8 or lower? (...first time setup? please see next section)

  1. Before upgrading your project, MAKE A BACKUP! The latest version of AudioLink changes many things - better safe than sorry.
  2. Take note of which AudioSource you are using to feed AudioLink, this reference may be lost during upgrade.
  3. If you haven't ever used VRChat Creator Companion (VCC) with your project, follow the steps below. Otherwise, skip to step 4:
    • Download and install the VRChat Creator Companion, open it up.
    • Use the "Add" option in the "Projects" tab and follow the steps shown to add your project to the VCC.
    • Open the Projects tab, select your project, press the "Migrate" button and follow the steps shown.
  4. Open the Projects tab and select your project.
  5. On the right side, find the AudioLink package and add it. If it doesn't show up, make sure you have the "Curated" toggle enabled in the top-right drop-down.
  6. In a file browser, without Unity open, navigate to your projects Assets folder and delete the "AudioLink" folder and "AudioLink.meta" file.
  7. Open the Project in Unity.
  8. You may be prompted by the AudioLink shader upgrader to upgrade old shaders. You should do so if your project uses any custom AudioLink-enabled shaders.
  9. If you were using assets from the AudioLink example scene, you'll have to import it, as it isn't imported by default. To do so, use the "AudioLink -> Open AudioLink Example Scene" in top menu of the editor.
  10. If you were using AudioReactiveObject or AudioReactiveLight components, you may need to manually re-enable the "Audio Data" under AudioLink "experimental" settings. This feature is now considered experimental until VRChat maybe gives us native asynchronous readback.
  11. In scene(s) containing old versions of AudioLink:

Upgrading avatar projects

  1. In a file browser, delete the "Assets/AudioLink" folder and the "AudioLink.meta" file.
  2. Follow the "First time setup" steps for avatar projects described below.

Installation

VRC

Looking to test out an avatar? See the "For VRC Avatar Testing" section. Otherwise, see the "For VRC Worlds and other usecases" section after installation.

VCC (Windows Only)

  1. Download and install the VRChat Creator Companion (VCC), open it up.
  2. Add your project to the VCC:
    • If you want to create a new project, use the "New" option in the "Projects" tab and follow the steps there.
    • If you want to use an existing project, use the "Add" option in the "Projects" tab and follow the steps there.
  3. Open the Projects tab and select your project. If you have never used the VCC with the project, use the "Migrate" button to upgrade it.
  4. On the right side, find the AudioLink package and add it. If it doesn't show up, make sure you have the "Curated" toggle enabled in the top-right drop-down.
  5. At this point, the installation is done. To open your project, you can use the "Open Project" button in the VCC.

Commandline (Linux/macOs/Windows)

For installing on Linux and macOS, and for Windows users who prefer the command line, we recommend using vrc-get. This is because it is open-source and, at the time of writing, vpm has unresolved bug(s) that might stop it from working on some systems.

vrc-get
  1. Install vrc-get
  2. Open a console and cd /path/to/your/project
  3. Run vrc-get i audiolink
vpm
  1. Install vpm and follow their setup instructions
  2. Run vpm add package com.llealloo.audiolink -p /path/to/your/unity/project

General (non VRC, including CVR)

  1. Download and Import the latest UnityPackage AudioLink Release at https://github.com/llealloo/vrc-udon-audio-link/releases.
  2. Use the "Tools/AudioLink/Add AudioLink Prefab to Scene" menu item. It should work out of the box.

Getting started

After installation, to use AudioLink:

  1. If you want to view the example scene, use the "AudioLink/Open AudioLink Example Scene" button in the top menu of the editor or use the "Tools/AudioLink/Add AudioLink Prefab to Scene" menu item.

For VRC Avatar Testing

  1. Under AudioLinkAvatar/AudioLinkInput, add a music track to the AudioClip in the AudioSource.
  2. Enter playmode to test your avatar.

For VRC Worlds and other usecases

  1. Click the "Link all sound reactive objects..." button on the AudioLink MonoBehaviour to link everything up.

Compatible tools / assets

Thank you