LWO File Format (.lwo)
An LWO file stores a single 3D object for NewTek LightWave, its points, polygons and LightWave surface (material) definitions laid out as IFF chunks, the same tagged-chunk scheme Commodore designed for the Amiga.
LWO at a glance#
| Full name | LightWave Object |
|---|---|
| File extension | .lwo |
| Category | 3D Models |
| Developer | NewTek |
| First released | 1990 |
| Compression | Uncompressed |
| FileFlip support | FileFlip reads this format but does not write it |
What a .lwo file can hold#
These are the things a LWO file either supports or does not, and they are what decides whether a conversion keeps everything or quietly drops something.
| Embedded metadata | Yes |
|---|---|
| Textures and materials | Yes |
Strengths and limitations of LWO#
What LWO does well
- IFF's chunked layout lets an application skip sections it doesn't recognize instead of failing to parse the whole file
- Surface definitions carry detailed shading data: colour, specularity, glossiness and layered texture maps
- Broadcast graphics and visual effects pipelines built on LightWave still produce and consume LWO directly
Where LWO falls short
- LWOB, used before LightWave 6.0, and LWO2, used from 6.0 onward, are different enough that an old importer can fail on a newer file
- Geometry only: the camera, lights and animation that place an LWO in a scene live in a separate LWS file
- Support outside LightWave itself depends entirely on whether an application's importer was updated for LWO2 or LWO3
Keep an object as LWO while it's staying inside a LightWave scene, since that's the format LightWave's own surfacing model round-trips without loss.
Convert LWO to OBJ or FBX once the object needs to leave LightWave for an engine or another modeller that doesn't ship an LWO importer.
How to open a .lwo file#
A .lwo file opens in the programs below, grouped by the platform you are on. If you would rather not install anything, FileFlip converts LWO into a format your machine already opens, and it does it in the browser tab rather than on a server.
| Platform | Programs that open it |
|---|---|
| Windows | LightWave 3D |
| macOS | LightWave 3D |
| Web | FileFlip |
LWO questions people ask#
What is an LWO file?
An LWO file is a LightWave Object: the points, polygons and surface (material) definitions of a single 3D object, built on the IFF chunk format NewTek carried over from its Amiga roots. LightWave scenes reference LWO files by name rather than embedding the geometry, so a scene and its objects usually travel together.
What's the difference between LWO and LWS files?
An LWO file holds one object's geometry and surfacing; an LWS file is the LightWave scene that loads one or more LWO objects and adds the camera, lights, hierarchy and animation around them. Neither file is useful alone if the other half is missing.
What opens an LWO file?
LightWave 3D, the application LWO was built for, opens it natively on Windows and macOS. A handful of other 3D applications include an LWO importer, but support varies by whether that importer was updated to handle the newer LWO2 chunk layout introduced in LightWave 6.0.
Converting LWO files#
Convert LWO to another format
FileFlip does not write .lwo files, so nothing on the site converts into this format. It works as a source only.
Every conversion runs inside your browser. The file is read from your disk, the work happens on your own machine, and nothing is uploaded. How FileFlip works names the engine behind each family and how to verify that for yourself.