Glossary

What is GLB?

GLB is the binary version of glTF, an open standard 3D model format often called 'the JPEG of 3D.' A single .glb file packs the 3D mesh, materials, textures, and animations together, making it a compact, widely-supported way to share 3D models across game engines, web viewers, and 3D tools.

glTF (GL Transmission Format) was designed for efficient delivery of 3D content. It comes in two flavors: a text-based .gltf (with separate asset files) and the binary .glb, which bundles everything into one file. GLB is the more convenient form for sharing because there's nothing to lose track of — the geometry and textures travel together.

GLB is supported almost everywhere 3D appears: engines like Unity and Unreal, web frameworks like three.js and model-viewer, and 3D tools like Blender. That broad support is why it's a great general-purpose export for a 3D model you might use outside of VTubing.

VRM is built on top of glTF, so a VRM is essentially a GLB with extra avatar-specific data (humanoid bones, facial blendshapes, look-at behavior). For VTubing you want the VRM; for everything else 3D, the GLB is handy. That's why every VTubeMe download includes both — the .vrm for VTuber apps and the .glb for general 3D tools.

GLB — FAQ

What is a GLB file?
A GLB file is the binary form of glTF, a standard 3D model format. It packs the mesh, materials, textures, and animations into one compact file that works across most 3D software and engines.
What's the difference between GLB and VRM?
VRM is built on top of glTF/GLB and adds avatar-specific data like humanoid bones and facial blendshapes. Use VRM for VTuber apps; use GLB for general 3D tools. VTubeMe gives you both.
What can open a GLB file?
Most 3D software and engines, including Blender, Unity, Unreal, and web viewers like three.js and Google's model-viewer.
Is GLB the same as glTF?
GLB is the binary, single-file version of glTF. Plain glTF (.gltf) is text-based and references separate asset files; GLB bundles everything into one .glb file.

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