Convert Glb - To Vrm Full

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

For production use, consider these dedicated tools:

# Using VRM Converter (Unity-based)
# Download from: https://github.com/vrm-c/UniVRM/releases
VRM expects the model to face +Z forward and +Y up. GLB files often come facing +X or +Y.
This is where a "basic" conversion differs from a "full" conversion. Leo had a moving model, but it was a statue. To make it a full VRM, he needed to add personality. convert glb to vrm full
1. Blendshapes (Expressions):
A GLB file might have shape keys for blinking or smiling, but VRM needs to know what those keys are for.
Leo selected his model and opened the VRM export window. Under the "Blendshapes" tab, he mapped his model's morph targets to VRM standards.

2. Spring Bones (The Bounce):
One of the most defining features of a VRM file is physics baked into the file itself.
"My helmet has a antenna," Leo noted. "In GLB, it's rigid. In VRM, it should wobble."
He added VRMSpringBones. He created a bone group for the antenna, setting parameters for stiffness and gravity. Now, when the avatar turned its head, the antenna would lag behind naturally, giving it that anime "alive" feel.
3. LookAt (Eye Tracking):
He calibrated the eye bones. He defined the range of motion so that when a user looks at a camera in a VTuber app, the avatar's eyes would follow. converter = GLBtoVRMConverter()
converter
You cannot convert a static GLB to a VRM directly. You must rig it manually in Blender (using Rigify) and then weight paint. Expect to spend 2-3 hours learning this.
Automated option (command-line / batch):



For complete VRM export (with textures, bones, and expressions), use this more comprehensive approach: For production use, consider these dedicated tools: #
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": {}
}
}
}
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")



Import GLB File:



Adjust and Clean Up the Model:



Export to VRM:



VRM Export Settings: