 
 MEDIUM
 MEDIUM |  |  | |
| Name | Rhino OpenNURBS | STEP | 
| File extension | .3dm | .stp, .step | 
| Original software | Rhinoceros 3D | |
| Binary | ■ | ■ | 
| ASCII | ■ | |
| Polygonal | ■ | |
| NURBS | ■ | ■ | 
| Solids | ■ | |
| Smoothing groups | ■ | ■ | 
| Textures, materials | ■ | |
| Developer/Owner | Robert McNeel & Associates | ISO | 
| Description | ||
| Specification | OpenNURBS | Download PDF | 
| Format features | The format of the first NURBS-Modeling software for Windows. Is currently open, so there are converters from/to lots of formats | The basic format of the transfer surfaces between CAD-systems. See also IGES | 
| Viewing software | Deep View (free) | Delcam Exchange 2012 (free), eDrawings (free) |