GLTF File Format Explained

What It Stores

The format uses JSON to define scene hierarchies, nodes, cameras, and PBR material parameters. It can reference geometry data through external binary buffer files and textures through standard image formats. These assets can be stored as external files, embedded in a .gltf file, or packaged into a .glb binary container.

Primary Use Cases

• Web-based 3D model viewers and configurators.
• Augmented Reality (AR) experiences on mobile devices.
• Asset streaming for real-time engines and virtual worlds.

Strengths

• Optimized for rapid GPU uploading and minimal CPU processing.
• Extensible design supports extensions such as Draco mesh compression and KTX textures.
• Maintains consistent visual appearance via standardized PBR workflows.

Limitations

• Managing multiple external dependencies (.bin and images) can be cumbersome.
• Limited support for advanced, non-standard material nodes or complex shader graphs.

Common Software Support

Widely supported in Blender, Unity, and Unreal Engine, often through built-in features or plugins. Widely utilized in web frameworks like Three.js and Babylon.js.

Additional Notes

While .gltf often uses separate files, .glb is the binary form of glTF and can package the JSON and resources into a single file for easier distribution.