lvra.gitlab.io/content/docs/vrchat/unity.md

weight	title
900	Unity

Unity

For the best experience, we found that running Unity from Flatpak is usually preferred.

Setting up a VRChat avatar/world project

First, take a look at this page from the official VRChat docs about the Unity 2022 upgrade. We'll do something similar.

1. Install Unity Hub from Flatpak.
2. Install the 3rd party VRChat package manager vrc-get.
   • you can install via cargo install vrc-get
   • An AUR package is also available here: vrc-get AUR.
3. Open Unity Hub and sign in with your Unity account.
4. Install 2022.3.6f1 (the current supported Unity version, at the time of writing) by running xdg-open unityhub://2022.3.6f1/b9e6e7e9fa2d.
5. When prompted, select Android Build Support and Windows Build Support (Mono).
6. Create a new project with the 3D Core template, making sure to name it and give it a better location than $HOME.
7. If it opens a window partially offscreen like it did for me (KWin Wayland), press ALT+F3 -> More Actions -> Move.
8. Close the Unity project (will probably crash later if you don't, no big deal but still).
9. Open terminal and cd to the project dir.
10. Run either vrc-get install com.vrchat.avatars or vrc-get install com.vrchat.worlds depending on what you will be making.
11. Reopen the Unity project and it will import the new packages.
12. Go to VRChat SDK -> Show Control Panel and dock it to the main window.

Now you should be able to create and upload avatars and worlds like you normally would.

If you're having issues, consult the Troubleshooting section.

Troubleshooting

AssetBundle was not built

When building and uploading, this error message may appear. It's caused by VRCSDK building an AssetBundle whose filename has mixed caps, when Unity AssetBundles are really only supposed to have lowercase filenames.

The solution is to import this unitypackage: https://github.com/thegu5/VRCSDKonLinux/releases

Importing this will mod the appropriate VRCSDK methods to be case-sensitive-aware.

NullReferenceException when uploading

This is an SDK bug. Vote for this Canny!

To patch it temporarily, run this command:

cd ~/YourProject
git apply << EOF
diff --git a/Packages/com.vrchat.base/Editor/VRCSDK/Dependencies/VRChat/API/VRCTools.cs b/Packages/com.vrchat.base/Editor/VRCSDK/Dependencies/VRChat/API/VRCTools.cs
index 5104edb..5820d61 100644
--- a/Packages/com.vrchat.base/Editor/VRCSDK/Dependencies/VRChat/API/VRCTools.cs
+++ b/Packages/com.vrchat.base/Editor/VRCSDK/Dependencies/VRChat/API/VRCTools.cs
@@ -108,7 +108,13 @@ namespace VRC.SDKBase.Editor.Api
                 {
                     continue;
                 }
-                var groups = (IEnumerable)groupsList?.GetValue(servicePointGroups.GetValue(scheduler));
+                // var groups = (IEnumerable)groupsList?.GetValue(servicePointGroups.GetValue(scheduler));
+                var servicePointGroup = servicePointGroups?.GetValue(scheduler);
+                if (servicePointGroup == null)
+                {
+                    continue;
+                }
+                var groups = (IEnumerable)groupsList?.GetValue(servicePointGroup);
 
                 // we're going to retry finding the active service point
                 if (groups == null)
EOF

Using VCC instead?

If you prefer GUIs, it is now possible to use VRChat Creator Companion (VCC) on Linux.

The official VRChat Creator Companion uses Webview2 (Microsoft Edge). This component is difficult to install, and doesn't run natively. Instead, you can use LinuxCreatorCompanion.

GitHub repo for LinuxCreatorCompanion

It works by using wine to extract the necessary bits to re-embed into a native client application.

Build and installation instructions are in the README.

While experimental, you can enjoy much easier avatar, world, and asset creation in this utility, should everything operate as expected. Again, this is experimental, and we discourage you from trying this on important projects. Remember to make frequent project backups. Please leave any feedback about bugs or ideas on the GitHub issues tab.