LWS to USDA Converter
FileFlip converts LWS to USDA 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 an LWS file to USDA?#
- Drop your LWS 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 USDA 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 USDA file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting LWS to USDA lose quality?#
Not in the sense of pixels or samples. Converting LWS to USDA rebuilds the file in USDA's own model rather than re-encoding it, so everything USDA 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 LWS files online?#
Yes, because nothing is uploaded. FileFlip converts LWS 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 LWS to USDA actually does to the file#
Converting LWS to USDA 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.
| Engine | Assimp |
|---|---|
| Conversion path | One step: LWS → USDA |
| 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 |
| 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 | Sometimes | Survives for some files and not others. |
What is an LWS file?#
An LWS file is a NewTek LightWave scene, a plain-text list of the LWO objects it loads along with the cameras, lights, item hierarchy and keyframed animation that arrange them.
Keep a scene as LWS while it's still being lit, animated and arranged inside LightWave's Layout.
Convert LWS to FBX or glTF once the arranged scene needs to move into a game engine or another DCC tool.
What is a USDA file?#
A USDA file holds a USD scene written out as plain UTF-8 text, spelling out every prim, attribute and layer composition line by line, in the encoding Universal Scene Description calls its ASCII form.
Use USDA while authoring or debugging a layer by hand, or whenever a file needs to go through text-based diff and review.
Convert USDA to USDC once a layer is finished and only needs to load fast, not be read by a person.
LWS to USDA questions people ask#
What is an LWS file?
An LWS file is a LightWave scene: a plain-text file that lists the LWO objects it uses and adds the cameras, lights, parenting and animation that arrange them in Layout, LightWave's animation and rendering module.
Can I open an LWS file without the LWO objects it references?
Not usefully. An LWS file stores references to LWO object files by name rather than the geometry itself, so LightWave (or any other LWS reader) needs those LWO files in the expected location to reconstruct the scene.
Is LWS the same as an LWO file?
No. LWO holds a single object's geometry and surfacing, while LWS is the scene that arranges one or more LWO objects with cameras, lights and animation. The two formats are a pair: an LWS file is only complete alongside the LWO files it loads.
What does a USDA file look like inside?
A USDA file is plain text starting with a line like #usda 1.0, followed by prims declared with curly-brace blocks holding their typed attributes, much like a structured configuration file. Any text editor shows it exactly as written.