Convert Glb To Vrm (ORIGINAL × WORKFLOW)

The conversion of GLB to VRM is a common requirement for adapting generic 3D models into specialized humanoid avatars used in VTubing and social VR platforms. While both formats are based on the glTF 2.0 standard, VRM adds specific humanoid constraints and metadata that require a deliberate "re-authoring" process. Core Conversion Methods 1. The Professional Workflow (Unity + UniVRM)

This is the industry-standard method for creating feature-complete VRM avatars with physics (spring bones) and complex expressions. Tools Required: Unity Engine and the UniVRM plugin. Process: Import your GLB file into a Unity project. Configure the Rig Type to "Humanoid" and map the bones.

Set up materials using VRM-specific shaders like MToon for the anime look.

Configure Spring Bones for hair/clothing physics and BlendShapes for facial expressions. Export using the VRM Exporter menu. 2. The Blender Workflow (Without Unity)

Ideal for artists who prefer staying within a 3D modeling environment. Convert GLB into VRM | Avaturn | Developer Docs

Converting a (glTF Binary) file to is a common task for VTubers and social VR users who want to use custom 3D models in platforms like VRChat or Luppet. Since VRM is based on the glTF standard, the conversion is relatively straightforward but requires specific tools to add "humanoid" avatar data. Here are the two best ways to handle the conversion: Option 1: Using the VRM Add-on for Blender (Easiest)

This method is ideal if you want to stay within one program and avoid setting up a Unity project. Install the Add-on : Download and install the VRM Add-on for Blender . It supports Blender versions 2.93 through 5.1. Import your GLB File > Import > glTF 2.0 (.glb/.gltf) and select your model. Prepare the Model

: Ensure your model is rigged with a humanoid armature. Use the VRM panel in the sidebar (press ) to map your bones to the VRM humanoid standard. File > Export > VRM (.vrm)

. Fill in the metadata (title, author, license) in the export dialog and click Option 2: Using Unity & UniVRM (Professional/Advanced)

This is the standard industry workflow and provides the most control over "spring bones" (hair/clothing physics) and facial expressions. Setup Unity : Create a new Unity project and import the UniVRM package Import Model : Drag your GLB file into the Unity Assets folder. Set as Humanoid : Select the imported model, go to the tab in the Inspector, change "Animation Type" to , and click Configure VRM

: Drag the model into your Scene. Select it and go to the top menu: VRM0 > Export to VRM Final Polish : You may need to re-import the resulting VRM to adjust VRM-specific settings

like the First Person view position or BlendShape (expression) proxies. Quick Tips for a Clean Conversion

: If your textures are missing after export, ensure they are "embedded" in the original GLB or properly mapped in your project folder before exporting. Bone Naming : VRM requires a specific hierarchy. If using Blender, the VRM Add-on can often auto-detect and map these for you.

: Always check your model scale (1 unit = 1 meter) before exporting to avoid your avatar being giant or tiny in-game. Which platform are you planning to use your VRM model on?

Knowing the destination can help determine which physics settings you'll need.

Converting a GLB (binary glTF) file to VRM is a common task for creators wanting to use custom 3D models as avatars in Vtubing software or social VR platforms. Since VRM is essentially a specialized extension of glTF designed for humanoid avatars, the process involves "adding" avatar-specific data (like bone mapping and facial expressions) to your existing 3D model. Key Conversion Methods

Unity with UniVRM (Professional Standard): This is the most robust method. You import your GLB model into a Unity project, install the UniVRM plugin, and use it to map the humanoid bones, set up "Spring Bones" for hair/clothing physics, and define "Blend Shapes" for facial expressions before exporting as a .vrm file.

Blender with VRM Add-ons: For those who prefer a 3D modeling environment, you can use the VRM Add-on for Blender. This allows you to import your GLB, rig it to a humanoid skeleton if it isn't already, and export directly to VRM without leaving Blender.

Vesta (Web-Based Tools): There are emerging web-based converters like Vesta or V-Sekai tools that attempt to automate the process for standard GLB models, though they may offer less control over expressive details than Unity or Blender.

VRoid Studio (Limited): While VRoid Studio is primarily for creating avatars from scratch, its "Dress-Up" feature can sometimes be used to import compatible assets and export them in the VRM format. Why Convert to VRM?

Unlike a standard GLB, which is a general-purpose 3D container, a VRM file includes:

Humanoid Bone Mapping: Ensures the model moves correctly with motion capture.

Eye Look & Lip Sync: Metadata that tells apps how the avatar should blink or speak. convert glb to vrm

License Information: Embedded permissions regarding who can use the avatar and for what purpose.

For a deep dive into the technical requirements, the vrm.dev documentation is the authoritative source for the standard. What is GLB file format and how to open it - CAD Exchanger

To convert a GLB to a VRM, you essentially need to add humanoid avatar metadata (like bone mapping and expressions) to a standard 3D file. Since VRM is based on the glTF 2.0 format (of which GLB is the binary version), the conversion process focuses on "normalizing" the model for VR applications. 🛠️ Method 1: The Blender Way (Recommended)

This is the most common method for creators. It gives you full control over materials and rigging.

Install the Add-on: Download and install the VRM Add-on for Blender. Import GLB: Go to File > Import > glTF 2.0 (.glb). Map Humanoid Bones: Select your armature.

In the VRM tab, assign your model's bones to the corresponding VRM standard bones (Head, Spine, Hips, etc.).

Set Up Materials: Use the MToon shader for an anime-style look. Export: Go to File > Export > VRM. 🎮 Method 2: The Unity Way

Use this if you need advanced features like Spring Bones (for hair/clothing physics) or specific VRChat compatibility.

Converting a GLB to VRM is a common requirement for using 3D avatars in VTubing and social VR applications. Because the VRM format is technically a GLB file with custom extensions added to define humanoid bone structures and expressions, you cannot simply rename the file; you must map the humanoid bones to the VRM standard. Top Tools & Methods

VRM Add-on for Blender: This is the most professional and flexible method. It allows you to import your GLB, rig it as a humanoid, and define VRM-specific data (like spring bones and blend shapes). Available at: VRM Add-on for Blender Official Site

Best for: Customizing bone physics, eye movement, and facial expressions.

UniVRM (Unity): The official SDK for creating VRM files. You can import your GLB into Unity, use UniVRM to "Humanoid-ize" the skeleton, and export the final .vrm. Available at: UniVRM GitHub Repository

Best for: Setting up license information and advanced avatar behaviors.

VRoid Studio (Dress-Up Feature): A simpler, more automated path for users who don't want to use heavy 3D software. You can use the Dress-Up feature to import 3D assets and export them as VRM.

V-Connect / Web-Based Converters: There are various browser-based tools that offer "drag and drop" conversion from GLB to VRM by automatically attempting to map standard bone names (Mixamo, etc.) to the VRM specification. Key Conversion Requirements

Humanoid Skeleton: The GLB must have a standard humanoid rig (hips, spine, neck, head, and limbs).

T-Pose: For the best results in applications like VRChat or VSeeFace, the model should be in a "T-Pose" rather than an "A-Pose" before exporting.

Metadata: VRM files require specific metadata, including the avatar's name, version, and usage permissions (e.g., commercial vs. non-commercial).

Converting a (glTF Binary) to (the standard for 3D human-like avatars) is a common workflow for users of VRChat, VTubing software, and the metaverse. Because VRM is an extension of glTF, the conversion focuses on adding humanoid metadata and bone constraints.

Below is a "cheat sheet" or summary paper on how to perform this conversion. 1. The Standard Workflow (Unity + UniVRM)

This is the most reliable method, as VRM was originally designed for the Unity ecosystem. Tools Needed: UniVRM plugin Step 1: Setup: Import the UniVRM package into a new Unity project. Step 2: Import GLB: file into the Unity Assets folder. Ensure the model is in a bone structure. Step 3: Rigging:

Select the model in Unity, go to the "Rig" tab in the Inspector, and set the Animation Type to The conversion of GLB to VRM is a

. Click "Configure" to map the bones (head, chest, arms, legs). Step 4: Export: Select the model in your Hierarchy, go to the top menu VRM0 -> Export to VRM . Fill in the required metadata (Title, Author, License). バーチャルマーケット 2. The Blender Workflow (VRM Add-on)

Ideal for 3D artists who want to stay within a single modeling suite. Tools Needed: VRM Add-on for Blender Step 1: Import GLB: Open Blender and go to File > Import > glTF 2.0 (.glb) Step 2: Assign VRM Data:

Once the add-on is installed, a "VRM" tab appears in the Sidebar (

-panel). You must link your armature's bones to the VRM humanoid bone list. Step 3: Export: File > Export > VRM (.vrm)

. The add-on will validate the model for common errors (like missing eyes or incorrect scaling) before saving. 3. Key Conversion Requirements

A standard GLB will not work as a VRM unless it meets these "avatar-ready" criteria: Bone Naming:

Must follow the humanoid standard (e.g., Hips, Spine, Head, LeftUpperArm). Materials: VRM specifically supports

(for anime styles) and standard PBR materials. You may need to swap your GLB materials to VRM-compatible shaders for the best look.

VRM files require license info (e.g., "Is commercial use allowed?") embedded in the file. 4. Comparison of Formats GLB (glTF) Primary Use General 3D (Web, AR) 3D Avatars (VTubing, Social VR) Optional / Generic (Humanoid Rig) Expressions Shape keys only Standardized "BlendShapeProxy" None (static) "Spring Bones" (hair/cloth physics) How to make VRM file

Converting a GLB file to VRM is the essential first step for anyone looking to bring their 3D models into the world of VTubing and social VR. While GLB is the industry standard for efficient 3D delivery, VRM is the specialized language of digital identity, carrying the data needed for facial expressions, bone physics, and meta-information.

In this guide, you will learn exactly how to bridge the gap between these two formats, the tools required for a seamless transition, and how to troubleshoot common issues like "broken" textures or stiff hair. What is GLB and Why Convert to VRM?

GLB is a binary version of the glTF (Graphics Library Transmission Format). It is widely used because it packs everything—geometry, textures, and animations—into a single, compact file. It is the "JPEG of 3D."

VRM, built on top of glTF, adds a layer of "humanoid" data. A standard GLB file doesn't know which part of the mesh is a blinking eye or a flowing skirt. Converting to VRM allows you to:

✨ Map Humanoid Bones: Ensure your avatar moves naturally with motion capture.

🎭 Define Blend Shapes: Set up expressions like "Joy," "Angry," or "Blink."

💃 Apply Spring Bones: Add physics to hair, clothing, and accessories.

🔒 Set License Permissions: Embed usage rights directly into the file.

Method 1: Using Unity and UniVRM (The Professional Standard)

This is the most robust method. It gives you total control over shaders and physics. 1. Set Up Your Environment Download and install Unity Hub.

Install the specific Unity version recommended by the UniVRM documentation (usually a stable LTS version).

Download the latest UniVRM package (.unitypackage) from GitHub. 2. Import Your Assets Open a new Unity project. Drag the UniVRM package into your project to install it. Drag your GLB file into the Assets folder. 3. Rigging Check Select your model in the Assets folder. In the Inspector, go to the Rig tab. Ensure "Animation Type" is set to Humanoid.

Click Configure to verify that Unity has correctly mapped the head, arms, and legs. 4. Export to VRM Drag your model into the Scene hierarchy. Go to the top menu: VRM0 -> Export to VRM. Fill in the Title, Version, and Author (required fields). Click Export. Method 2: Using Blender (The Open-Source Way) Blender 3

If you are a 3D modeler, you can handle the conversion without ever leaving Blender using the VRM Add-on for Blender.

Step 1: Install the "VRM Add-on for Blender" (available on GitHub). Step 2: Import your GLB file.

Step 3: Ensure your armature (skeleton) follows the VRM bone naming conventions. Step 4: Go to File > Export > VRM (.vrm).

Note: This method is faster but can sometimes lead to shader issues if you aren't familiar with Blender’s node system. Method 3: Online Converters (The Quickest Fix)

For those who don't want to install heavy software, web-based tools like V-Hub or specific specialized GLB-to-VRM web converters exist. Pros: Instant results; no technical setup.

Cons: Very limited customization. You cannot easily fix "weight painting" errors or fine-tune hair physics. Common Troubleshooting Tips ❌ My textures look different!

GLB often uses PBR (Physically Based Rendering), while VRM frequently uses MToon shaders for a stylized anime look. In Unity, select your materials and change the Shader dropdown to VRM/MToon to get that classic VTuber aesthetic. ❌ The model is too small or facing the wrong way. VRM files require a specific orientation. Scale: 1 unit in Unity = 1 meter. Direction: The model must face the Positive Z-axis. ❌ The "Export" button is greyed out.

This usually happens if you missed the Meta data. Ensure you have entered a name and author in the export settings. Where can I use my new VRM file? Once your conversion is complete, your file is ready for: VSeeFace / Luppet: For high-quality face tracking.

VRChat: (Requires a conversion back to FBX/Unity prefab, but the VRM structure helps). Warudo: For complex 3D streaming setups. Helios / Cluster: For social VR exploration.

What software did you use to create the original GLB? (e.g., Blockbench, Blender, Nomad Sculpt) Are you seeing any specific error messages during export?

2. Use Blender + VRM Add-on (Most Reliable)

Blender acts as the bridge.

What you need:

Process:

  1. Import your .glb (File → Import → glTF 2.0)
  2. In Object Mode, select the armature (skeleton)
  3. Go to Scene Properties → VRM tab
  4. Check “Humanoid” – if bones are named wrong, use the “Auto Setup” or manually map them (hips, spine, neck, etc.)
  5. Add blendshapes (visemes, expressions) – can be skipped for a basic avatar but eyes won’t blink
  6. Export as .vrm (File → Export → VRM)

⏱️ Takes 10–30 minutes for a clean GLB with rig.

3. Physics Stress Test

Swing the head around. Does the hair clip through the shoulders? If so, return to the source file and adjust the Collider Capsules in the Spring Bone settings.

Method B: The Unity Pipeline (VRChat/VRM Converter)

Best for: High-end production, testing shaders, and complex physics.

  1. Setup: Import the GLB into a Unity project with the UniVRM package installed.
  2. Humanoid Rig: In the Import Settings (Rig tab), change Animation Type to "Humanoid." Click Apply.
    • Troubleshoot: If Unity says "Bone mapping mismatch," you must fix the rig in Blender first.
  3. Conversion: Drag the model into the scene. Unity will auto-convert it. Use the VRM > Export to VRM menu.
  4. Meta Data: Fill in the required metadata (Title, Author, Version, License). This is a legal requirement of the VRM standard.
  5. Configuration:
    • First Person Layer: Set the "Head" bone to "Self Only" so the camera doesn't clip inside the avatar's face.
    • Spring Bone: Adjust stiffness, gravity, and drag for hair movement.
  6. Export: Generate the .vrm file.

Cons ❌

Step-by-Step Guide

Phase 1: Import and Convert

  1. Create a new Unity Project (use the 3D Core template).
  2. Install UniVRM: Go to Window -> Package Manager -> Add package by name -> Enter com.vrmc.vrm.
  3. Drag your .glb file into the Assets folder. Unity will extract the model and textures automatically.
  4. Click on the imported model. In the Inspector, go to the Rig tab. Change "Animation Type" from Generic to Humanoid. Click "Apply". This forces Unity to map your GLB's bones to the standard humanoid skeleton (Hips, Spine, Chest, Neck, LeftArm, etc.).
    • Troubleshooting: If Unity shows a "Mapping" error, your GLB is missing required bones (like Upper Chest). You must fix this in Blender first.

Phase 2: Set Up the VRM Meta Data

  1. In the Hierarchy, right-click -> Create Empty. Name it "MyAvatar".
  2. Add a component to this empty GameObject: VRM Meta Object.
  3. Add another component: VRM Look At Head (controls eye tracking).
  4. Add the final component: VRM First Person (controls how the avatar renders for the wearer).
  5. Drag your Humanoid GLB model from the Project view into the "MyAvatar" GameObject in the Hierarchy (make it a child).
  6. Select "MyAvatar" and click VRM0 -> Export to VRM at the top of the Inspector.

Phase 3: Export

  1. Fill out the mandatory metadata: Title, Author, Version, and License. (If you forget the license, the export fails).
  2. Click Export. Save as .vrm.

Result: A fully functional VRM file with proper eye tracking and humanoid animation.

Method A: The Blender Pipeline (Vrm Add-on for Blender)

Best for: Artists who prefer staying in Blender and need a quick, free conversion.

  1. Install Add-on: Install the "VRM Add-on for Blender" (by saturday06).
  2. Import GLB: Import your GLB file into Blender.
  3. Bone Mapping: Go to the VRM tab. You must manually verify that Blender has mapped the bones correctly (e.g., did it find the "LeftFoot"?).
  4. Spring Bones (Physics): Define "Colliders" (capsules on the head/chest that hair cannot pass through) and set bone groups to "Spring Bone" for hair and skirts.
  5. Expressions: Map your Shape Keys to the VRM Expression presets (e.g., map your "Wink" shape key to the VRM "Happy" preset).
  6. Export: Export as .vrm.

What is VRM?