Basic usage example:
Facial expressions do not work after conversion, blend shapes appear distorted, or the exported file size is abnormally small.
Ensure your avatar is facing the (front view should show the back of the avatar in standard Blender coordinates, or press Numpad 1 for front orthographic view to confirm it faces you). Step 2: Fix the Humanoid Rig (Armature)
Converting a GLB to a VRM is rarely a one-click process. Without proper adjustments, your converted avatar will likely suffer from broken textures, rigid hair, lifeless eyes, or completely broken animations. convert glb to vrm fixed
# Extract mesh data meshes = self._extract_meshes(scene)
This can happen due to missing metadata, incorrect object selection, or plugin version conflicts.
In Unity, look for the VRM BlendShape Proxy . You will need to manually click through "Blink," "A," "I," "U," "E," and "O" and move the sliders on your mesh to define those shapes. This "fixes" the avatar so it can talk and blink. 4. Normal Map "Inversion" Sometimes the lighting looks "inside out." Basic usage example: Facial expressions do not work
Beyond Blender and npm-based solutions, several other tools exist:
The most robust way to convert GLB to VRM is through using the free VRM Add-on . This method gives you full control to inspect, fix, and optimize your model before export.
Ensure left and right limbs use exact matching suffixes (e.g., Arm.L and Arm.R ) to allow proper mirroring. 3. Recalculate Normals If parts of the model appear transparent or hollow: Select the mesh objects and enter . Select all vertices by pressing A . Press Mesh > Normals > Recalculate Outside (or Shift + N ). 4. Export the Preliminary VRM You will need to manually click through "Blink,"
How to Convert GLB to VRM (Fixed and Rigged for Vtubing) Converting a 3D model from GLB (Binary glTF) to VRM is a crucial step for aspiring Vtubers, game developers, and metaverse creators. While GLB is excellent for general 3D scenes, VRM is specifically optimized for humanoid avatars, embedding bone structures, blend shapes, and spring bone physics directly into the file.
This is often what users mean by a "fixed" solution because it automates the rigging and metadata steps that usually break during manual conversion.
VRM requires a specific set of humanoid bones. If your GLB model uses non-standard naming or missing bones, export will fail. Some users have reported that certain GLB imports break the mesh due to bone count issues. Additionally, if a SkinnedMeshRenderer contains null bones in its bones array, the VRM export will produce invalid bone references.
Users who want a clean, browser-based mapping interface. Pros: No installation; supports VRM 1.0 and 0.x.