MEDIUM ![]()  | ![]()  | |
| Name | Parasolid Model Part File | Rhino OpenNURBS | 
| File extension | .x_t, .x_b | .3dm | 
| Original software | Rhinoceros 3D | |
| Binary | ■ | ■ | 
| ASCII | ||
| Polygonal | ■ | |
| NURBS | ■ | ■ | 
| Solids | ■ | |
| Smoothing groups | ■ | ■ | 
| Textures, materials | ■ | |
| Developer/Owner | Siemens PLM Software | Robert McNeel & Associates | 
| Description | ||
| Specification | OpenNURBS | |
| Format features | File geometric kernel Parasolid. Is used by CAD-systems such as NX, Solid Efge, SolidWorks | The format of the first NURBS-Modeling software for Windows. Is currently open, so there are converters from/to lots of formats | 
| Viewing software | Delcam Exchange 2012 (free) | Deep View (free) |