Unreal Engine 1 Mesh .uc
Unreal Engine 1 mesh data, from the UnrealScript era.
What a .uc file holds
These are the mesh definitions from the original Unreal Engine, where model data was declared alongside UnrealScript class files with .3d data files sitting beside them. Strictly historical at this point, but Unreal 1, Unreal Tournament and Deus Ex era content lives here.
Also seen as .3d.
Commonly seen in: Unreal Engine 1, Deus Ex, Unreal Tournament 99 mods.
| Data | Stored in UC |
|---|---|
| Geometry | Yes |
| Materials and colour | Yes |
| Texture maps | Yes |
| Animation and rigs | No |
| Scene hierarchy | Yes |
| Read here | Yes |
| Written here | No |
Tested against a real file
The last sweep loaded box.uc from Assimp test models with its 2 sidecar files through the viewer on this site: 12 triangles across 1 meshes and 1 materials, in 2.2 seconds. Every format's result is on the test results page, run 2026-09-08.
Convert UC to another format
Every pairing has a page saying what survives the trip.
Other things to do with a .uc file
Questions about UC
How do I open a .uc 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 UC a good format to archive in?
UC stores geometry, materials and colour, texture maps, 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 UC 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.