Files in the folder

You only ever need to double-click one file: the launcher for your system. The rest is the app itself, and almost all of it is inside the folder app, so the top of the folder stays short.

At the top of the folder

start.bat

The launcher for Windows. Double-click it to start the app.

start.command

The launcher for macOS.

start_hidden.vbs

Windows: starts the app like start.bat, without showing the launcher window.

start.ico

The icon for a shortcut. See Add a shortcut or an icon.

Install MeshOptimiser.bat

The installer for Windows. See Install on Windows.

README.txt, README.md, LICENSE

A short quick start in plain text, the project’s description, and the licence.

app

Everything else: the program and what it creates. The launchers at the top start the ones inside it.

Inside app: the ones you can use

step2glb.bat, step2glb.command

Convert a STEP file that you drag onto them, without opening the viewer.

Folders the app creates (inside app)

.venv

The app’s own Python environment, created on the first run. It can take up to about 2 GB. It is safe to delete: the launcher builds it again, which takes a few minutes. On macOS the folder is hidden in Finder, because its name starts with a dot.

inbox

Where STEP files are converted. The finished GLB files stay here for a day. Inside it, the folder cache keeps converted models, so opening the same STEP file with the same settings again is quick. It never holds more than 3 GB.

exports

Where the files that Claude’s tools make for you are saved: exports, saved scenes, pictures and videos.

The app itself (inside app)

serve.py

The small local server. It hands the app’s pages to your browser and starts the converter when you drop a STEP file.

step2glb.py

The converter from STEP to GLB.

gridmesh.py

A part of the converter: the even strips on curved faces.

index.html

The viewer’s page.

js

The viewer’s scripts. app.js is the program; the others are parts of it, such as holefill.js (the hole filler behind Remove holes), mesh-worker.js (a background worker so the window stays usable while Remove holes and Decimate run) and cloner.js (linear, grid and radial arrays of a part).

vendor

The libraries the viewer needs, bundled so that it starts without the internet.

assets

The app’s icons, pictures and help clips.

knowledge

The help articles and playbooks that Claude reads when it connects.

manifest.webmanifest

What lets Chrome and Edge install the page as an app.

requirements.txt

The list of Python add-ons the launcher installs: cadquery-ocp, trimesh and numpy.

version.json, updater.py

The version you have, and the program that applies updates.

ui.ps1

Draws the launcher window on Windows.

The download does not hold the project’s tests, tools, docs or changelog. They are in the repository, and the changelog is on this site.