.obj File Extension
.obj file contains, which applications open it, and how Poly supports this 3D format. File extension details for .obj
Full Support| File type | Wavefront OBJ |
|---|---|
| MIME type | |
| Encoding | ASCII text |
| Operating systems | Windows, macOS, Linux |
| Opens with | Blender, MeshLab |
| Poly support | Yes. Poly recognizes valid Wavefront OBJ files and makes supported geometry available in the file experience. |
| Indexed by Poly | Yes. Poly indexes the filename and creates visual similarity information for supported 3D content; available metadata is shown in details. |
| Preview in Poly | Yes. Poly previews supported Wavefront OBJ geometry. |
| 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 .obj?
OBJ is a line-oriented Wavefront geometry format. v, vt, and vn records define positions, texture coordinates, and normals; f records define faces. Materials commonly live in a separate MTL file, and textures are separate resources. The suffix normally uses the model/obj MIME type.1
The same .obj suffix can also mean a compiled object file produced by a software toolchain. That binary meaning is distinct from Wavefront geometry and may use a platform-specific binary media type. Poly's 3D features apply when the content is a valid Wavefront model.
How do I open a .obj?
Blender and MeshLab can import Wavefront OBJ files on desktop systems; Blender is another practical choice for conversion when its importer supports the asset. Keep the .mtl file and referenced images beside an OBJ model.
Export to GLB for a scene package with richer materials and animation, or to 3MF for additive manufacturing when package metadata matters. Renaming a suffix does not convert a file.
Poly support for .obj
Poly previews supported geometry, makes the filename searchable, and provides visual similarity for supported 3D content. Available geometry metadata appears in the details panel. 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 |
|---|---|
| Geometry | Vertices, normals, texture coordinates, and polygon faces |
| Materials | Supported through accompanying MTL data when available |
| Scene features | OBJ does not standardize cameras, lights, rigs, or animation |
Keep the original source when exact topology, custom attributes, or companion-file relationships matter.
History and alternatives
Wavefront Technologies introduced OBJ with Advanced Visualizer in the early 1990s as a vendor-neutral exchange format. 1
Use glTF or GLB for interactive scenes, 3MF for manufacturing packages, and STL when a simple triangular surface is enough. Convert in a 3D application and verify the exported model rather than relying on a filename change.
Footnotes
- Library of Congress. Wavefront OBJ file format. ↩ ↩2