Silo Model .sib
Silo’s files. A modeller built for pure subdivision work.
What an .sib file holds
SIB is the native format of Silo, a focused subdivision modeller that found a devoted following among character and concept artists who wanted modelling tools and nothing else. It stores the control cage along with material assignments.
Commonly seen in: Silo, character modelling archives.
| Data | Stored in SIB |
|---|---|
| Geometry | Yes |
| Materials and colour | Yes |
| Texture maps | No |
| Animation and rigs | No |
| Scene hierarchy | Yes |
| Read here | Yes |
| Written here | No |
Tested against a real file
The last sweep loaded heffalump.sib from Assimp test models with its 2 sidecar files through the viewer on this site: 724 triangles across 14 meshes and 5 materials, in 2.2 seconds. Every format's result is on the test results page, run 2026-09-08.
Convert SIB to another format
Every pairing has a page saying what survives the trip.
Other things to do with an .sib file
Questions about SIB
How do I open an .sib file?
Drop it into the viewer on this site and it opens in the browser, with the scene tree, the materials and the mesh statistics. Nothing is uploaded. If you want it in another program instead, convert it to GLB, which almost everything reads.
Is SIB a good format to archive in?
SIB stores geometry, materials and colour, scene hierarchy. Anything outside that list will not be in the file at all, so archive the original alongside it if the surfacing or the rig matters.
Does converting SIB lose quality?
Geometry is copied vertex for vertex, so the shape does not degrade. What gets lost is whatever the target format has no field for: convert to STL and the materials go, convert to OBJ and the animation goes. The comparison table on each converter page says exactly which.
Formats that hold the same things
Or go back to the full format reference.