.gltf File Extension
.gltf file contains, how to open glTF JSON scenes, and how Poly supports them. File extension details for .gltf
Full Support| File type | glTF JSON 3D scene |
|---|---|
| MIME type | |
| Encoding | JSON text with referenced or embedded binary resources |
| Operating systems | Windows, macOS, Linux, iOS, Android |
| Opens with | Blender, Khronos glTF Sample Viewer |
| Poly support | Yes. Poly recognizes glTF scenes and makes supported geometry and scene metadata available. |
| Indexed by Poly | Yes. Poly indexes the filename and creates visual similarity information for supported 3D content; available scene metadata is shown in details. |
| Preview in Poly | Yes. Poly previews supported glTF geometry and scene content. |
| Poly agent | Yes. An optimized rendition of the 3D object or scene is provided to the agent, allowing compact yet information-rich multimodal interaction with 3D files. |
What kind of file is a .gltf?
A .gltf file is the JSON scene description in glTF 2.0. Its scene, nodes, meshes, materials, buffers, and images entries describe the asset. Buffers and images may be separate files or embedded as data URIs, so a .gltf usually travels with referenced resources.1
glTF can describe nodes, meshes, materials, cameras, skins, and animation. Those capabilities belong to the format; an individual asset may use only a subset.
How do I open a .gltf?
Blender imports and exports glTF 2.0 through its glTF 2.0 importer and exporter.2 The Khronos glTF Sample Viewer provides a browser view for checking sample assets.3 Use a dedicated 3D editor when you need to edit rigs, materials, or animation tracks.
Choose .glb when one binary delivery file is more convenient. Keep every referenced buffer and image with a JSON glTF file when moving it between applications.
Poly support for .gltf
Poly previews supported geometry, makes the filename searchable, and records available scene metadata in the details panel. Visual similarity helps locate related 3D content. An optimized rendition of the 3D object or scene is provided to the agent, allowing compact yet information-rich multimodal interaction with 3D files.
| Construct | Poly handling |
|---|---|
| Meshes, nodes, and materials | Supported when present and valid |
| Textures | Available when the asset supplies usable image resources |
| Cameras and lights | Scene metadata is available; point, spot, and directional lights are supported, while area-light behavior is approximate |
| Skins and animation | Supported when represented; playback and visual fidelity depend on the asset |
Keep the original files for authoring, exact resource inspection, or round-trip export.
History and alternatives
Khronos published glTF as a runtime 3D asset delivery format; the 2.0 specification defines its JSON scene and resource model.1 For a manufacturing package with print-oriented metadata, consider 3MF. For a basic triangle surface, STL is simpler but carries much less scene information.
Changing a suffix does not convert a file. Export the scene with a tool that understands glTF, then verify texture paths, coordinate conventions, scale, and animation after conversion.
Footnotes
- Khronos Group. glTF 2.0 Specification. ↩ ↩2
- Blender Manual. glTF 2.0 importer and exporter. ↩
- Khronos Group. glTF Sample Viewer. ↩