Currently, there is a significant compatibility issue between this Decimater tool and VRCSDK3-AVATAR. The following symptoms have been observed:

1. Abnormal Behavior During Upload:

   • When attempting to upload an avatar with Decimater imported into the project, VRCSDK exhibits unexpected behavior.
   • Specifically, instead of referencing the prefab in the Hierarchy, VRCSDK generates a new Prefab in the Assets folder named after the Blueprint ID, and attempts to use this for the upload.

2. Error Occurrence:

   • As a result of the above behavior, a FileNotFoundException occurs, causing the upload to fail.

• This issue occurs simply by importing the Decimater tool into the project.
• The problem is reproducible even without executing any Decimating operations.
• While the cause is believed to be related to interactions with VRCSDK, addressing the issue is challenging due to inability to access the internal implementations of VRCSDK's VRCAvatarBuilder class and the VRC.SDK3.Builder.VRCAvatarBuilder.ExportCurrentAvatarResource method.

How to Install

1. Download the file from here and extract it into your Assets folder.

2. Next, download the latest release file (Unitypackage) from here and import it to complete the setup.

File Tree Structure

tree have to looks like this

Assets
├─MeshDecimater_Unity
│  ├─Material
│  ├─Shader
│  └─src
└─UnityMeshSimplifier
    ├─.circleci
    │  ├─ProjectSettings
    │  └─scripts
    ├─.github
    │  ├─ISSUE_TEMPLATE
    │  └─workflows
    ├─Editor
    ├─Runtime
    │  ├─Components
    │  ├─Exceptions
    │  ├─Internal
    │  ├─Math
    │  └─Utility
    └─Tests
        └─Editor

Select an object with a mesh from the Hierarchy or choose it from the ObjectField to use the plugin.

Similar to Blender, adjust the Decimate Level and press Apply Decimation to execute the decimation.

Clicking Revert will restore the original file.

Please note that Revert will not work after clicking on a different object (the original mesh will remain, so you can replace it to restore).

work confirmed in

・Unity 2022.3.22f1

・Unity 2019.4.31f1