COB to OBJ Converter
FileFlip converts COB to OBJ entirely inside your browser, using Assimp compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a COB file to OBJ?#
- Drop your COB file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to OBJ and the conversion starts on its own. FileFlip downloads 11.2 MB of WebAssembly the first time and nothing after that, then runs Assimp on your own machine.
- Save the OBJ file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting COB to OBJ lose quality?#
Not in the sense of pixels or samples. Converting COB to OBJ rebuilds the file in OBJ's own model rather than re-encoding it, so everything OBJ can represent comes through exactly and anything it cannot has to be dropped. Expect the geometry to be exact, and anything the target has no place for, such as a rig, to be left behind.
Is it safe to convert COB files online?#
Yes, because nothing is uploaded. FileFlip converts COB files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What COB to OBJ actually does to the file#
Converting COB to OBJ runs on Assimp, downloads 11.2 MB of WebAssembly the first time and nothing after that, rebuilds the file in the target's own model, and drops skeleton and animation.
| Engine | Assimp |
|---|---|
| Conversion path | One step: COB → OBJ |
| Downloaded to your browser | 11.2 MB, once, then cached by your browser |
| Quality | Rebuilt in the target's model |
| You get back | One file, or a ZIP when the source carries separate materials or buffers |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Materials | Sometimes | Survives for some files and not others. |
| Textures | Sometimes | Survives for some files and not others. |
| Skeleton and animation | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- the result is a single file when the model has no external materials or buffers, and a ZIP when it does
- if the source carries a skeleton or animation, this target has no place to store it
What is a COB file?#
A COB file holds a single object exported from Caligari trueSpace, its mesh, materials and scene-graph data stored as a sequence of tagged chunks such as PolH for geometry and Mat1 for materials, in either an ASCII or a binary encoding.
There's little reason to author new COB files; it matters for opening objects saved by a copy of trueSpace.
Convert COB to OBJ or FBX to bring a trueSpace-era object into a modeller that's still maintained.
What is an OBJ file?#
An OBJ file is a plain-text 3D geometry format that Wavefront Technologies designed for its Advanced Visualizer software, storing vertex positions, texture coordinates and normals as human-readable lines of ASCII text.
Use OBJ when a static mesh needs to move between two different applications with the least risk of anything being misread.
Convert away from OBJ when the model needs animation, a skeleton, or to travel as a single file without a companion MTL.
COB to OBJ questions people ask#
What is a COB file?
A COB file is a Caligari trueSpace object: a mesh with its materials and scene-graph data stored as tagged chunks. It's distinct from Truevision's COB video codec and from unrelated database or COBOL files that share the same extension.
What's the difference between COB and SCN files from trueSpace?
COB holds a single object; SCN is the same chunk format holding an assembled scene of multiple objects, lights and cameras. They're read by the same parser and differ only in what they contain.
Can I still open a COB file in trueSpace?
Only if you have a working copy. Caligari trueSpace was discontinued in 2009 after Microsoft's brief ownership of the company, and it hasn't been sold or supported since, so opening a COB file today usually means a converter or a library like Assimp rather than the original application.
What is an OBJ file used for?
An OBJ file stores the geometry of a single 3D model: its vertices, faces, texture coordinates and normals, written as plain text. It's used to move a static mesh between applications, since almost every 3D tool on every platform can read it.