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| Name | Rhino OpenNURBS | 3D Studio |
| File extension | .3dm | .3ds |
| Original software | Rhinoceros 3D | 3D Studio (DOS) |
| Binary | ■ | ■ |
| ASCII | ||
| Polygonal | ■ | ■ |
| NURBS | ■ | |
| Solids | ■ | |
| Smoothing groups | ■ | ■ |
| Textures, materials | ■ | ■ |
| Developer/Owner | Robert McNeel & Associates | Autodesk |
| Description | ||
| Specification | OpenNURBS | |
| Format features | The format of the first NURBS-Modeling software for Windows. Is currently open, so there are converters from/to lots of formats | Has a limit on the number of polygons in a single file. Today is considered obsolete |
| Viewing software | Deep View (free) | GLC_Player (free), MeshLab (free) |