Convert Glb To Vrm Full (5000+ CONFIRMED)

converter = GLBtoVRMConverter() converter.convert( "model.glb", "model.vrm", model_info= "title": "My Character", "version": "1.0", "author": "Your Name" )

For complete VRM export (with textures, bones, and expressions), use this more comprehensive approach:

import json
import numpy as np
from pathlib import Path
class GLBtoVRMConverter:
def init(self):
self.vrm_template = {
"specVersion": "1.0",
"title": "",
"version": "1.0",
"author": "GLB Converter",
"contactInformation": "",
"reference": "",
"texture": [],
"material": [],
"mesh": [],
"node": [],
"scene": 0,
"scenes": ["name": "default", "nodes": []],
"extensions": {
"VRM": {
"specVersion": "1.0",
"meta": 
"title": "",
"version": "1.0",
"author": "",
"contactInformation": "",
"reference": "",
"allowedUser": "OnlyAuthor",
"violentUssageName": "Disallow",
"sexualUssageName": "Disallow",
"commercialUssageName": "Disallow"
,
"humanoid": 
"humanBones": []
,
"firstPerson": {},
"lookAt": {},
"blendShapeMaster": {}
}
}
} convert glb to vrm full
def convert(self, glb_path, vrm_path, model_info=None):
    """Main conversion function"""
    print(f"Converting glb_path to vrm_path")
# Load and parse GLB
    with open(glb_path, 'rb') as f:
        glb_data = f.read()
# Parse GLB binary structure
    # This requires proper GLB parsing - see complete implementation above
# Update VRM metadata
    if model_info:
        self.vrm_template["extensions"]["VRM"]["meta"].update(model_info)
        self.vrm_template["title"] = model_info.get("title", "ConvertedModel")
# Save VRM
    with open(vrm_path, 'w', encoding='utf-8') as f:
        json.dump(self.vrm_template, f, indent=2, ensure_ascii=False)
print(f"Conversion complete: vrm_path")

Leo knew that simply changing the file extension would result in a broken file. A GLB file is often a "prop," while a VRM file must be a "humanoid." The first step was preparation.
He opened his modeling software (Blender). To convert GLB to VRM, the model must have a specific skeletal structure. converter = GLBtoVRMConverter()
converter
"The GLB file usually comes with an 'Armature' (a rig)," Leo muttered to himself, inspecting the hierarchy. "But for VRM, it needs to be mapped to the Humanoid skeleton."
The Lesson: If your GLB model is just a mesh without bones, you cannot convert it to VRM. You must "rig" it first. Since Leo’s helmet was a prop, he had to parent it to a standard human rig (often called the 'MMD Rig' or a standard Metahuman rig). For complete VRM export (with textures, bones, and
He appended a standard humanoid rig, scaled his helmet to fit the head bone, and parented the mesh to the bones with automatic weights. Now, he had the foundation.
This is the industry standard used by VRChat avatar creators. Unity (free) with the UniVRM package is the only tool that reliably converts GLB to fully functional VRM with expressions and physics.
VRM requires:


If your GLB isn’t humanoid, you must rig/rename bones manually or use Mixamo.