STP Viewer

3D STEP file previewer powered by OpenCascade WASM + Three.js.
Rotate, zoom, and inspect CAD models directly in your vault.

Features

• 🧊 3D STEP/STP preview — opens .stp and .step files as interactive 3D views
• 🔄 Orbit controls — rotate, pan, zoom with mouse
• 🎨 Display modes — solid shading, wireframe, edge overlay
• 📐 Preset views — ISO, front, right, top
• 📏 1:1 scale — actual-size rendering based on screen DPI
• 📊 Scale bar + XYZ axes — visual size reference

Installation

Manual

1. Download the latest release
2. Extract to <vault>/.obsidian/plugins/stp-viewer/
3. Reload Obsidian
4. Enable "STP Viewer" in Settings → Community plugins

Build from source

npm install
npm run build
npm run install-plugin

Usage

Open any .stp or .step file in your vault — the 3D viewer opens automatically.

Controls

Action	Input
Rotate	Left-click + drag
Pan	Right-click + drag
Zoom	Scroll wheel
Fit view	Toolbar → Fit button

Supported Formats

• STEP AP203 / AP214 (.stp, .step)

Dependencies

• OpenCascade.js (WASM) — STEP parsing
• Three.js — 3D rendering
• occt-import-js — STEP → mesh conversion

License

MIT