HIGH  |  | |
| Name | Silo model | Initial Graphics Exchange Specification |
| File extension | .sia | .igs, .iges |
| Original software | Silo | |
| Binary | ■ | |
| ASCII | ■ | |
| Polygonal | ■ | |
| NURBS | ■ | |
| Solids | ||
| Smoothing groups | ■ | ■ |
| Textures, materials | ||
| Developer/Owner | Nevercenter | U.S. National Bureau of Standards |
| Description | ||
| Specification | Download PDF | |
| Format features | Universal open interchange NURBS-surfaces format. Along with STEP - one of the most popular | |
| Viewing software | Silo | Delcam Exchange 2012 (free), eDrawings (free) |
