trilium_share_gruvbox/docs/embed-3d-model.md

Embedding a 3D model (STEP / STL) in a note

The share can render .step / .stp / .stl models interactively (three.js + occt-import-js, hosted locally). The viewer fills the available screen width (full-bleed, ~100vw) with a height based on the viewport (min(70vh, 900px)), so models use the maximum available space instead of the readable content width. The caption below the model always shows <file name> · <size> · <triangle count> (e.g. Wrench.stl · 711 KB · 14.6k triangles).

There are three ways to embed a model, depending on how you store the file.

Option A – Model as its own note (file note)

1. Create (or upload) a file note and make sure its title ends in .step, .stp or .stl, e.g. bracket.step or rear_housing.stp.
2. Put it under a category in the blog and set publish=true.
3. The note's share page then shows the interactive 3D viewer automatically: drag to rotate, scroll to zoom.

Option B – Model embedded inline in a text note (attachment)

1. Upload the STEP/STL file as an attachment of the note: drag & drop it onto the note, or use the attachment dialog (paperclip icon).
2. Rename the attachment so its title ends in .step, .stp or .stl (the viewer detects a model by the file name). Example: flange.step.
3. Insert the attachment link into the note body: right-click the attachment → "Insert link", or drag the attachment into the text.
4. On the share, that link is automatically replaced by the embedded 3D viewer.

Option C – Model embedded inline from a file note (recommended for blog posts)

This lets you write blog posts that contain models inline, referencing a model that also exists as its own (published) file note — the model stays in one place.

1. Create the model as a file note (title ends in .step / .stp / .stl), publish it (see Option A). The viewer needs it in blog_data, i.e. it must be a published article reachable in the blog tree.
2. In your text note, add a link to that file note, e.g. [Wrench.stl](#root/<noteId>) (markdown) or drag the note reference into the editor.
3. On the share, the link to a model file note is replaced by the inline viewer. You can embed several models per post this way.

Tip: STL (plain triangle meshes) is rendered with three.js only; STEP (CAD B-rep) is parsed by occt-wasm (OpenCASCADE V8, WASM, MIT/Apache-2.0) in a Web Worker (module worker, non-blocking). The first STEP view downloads the ~22 MB WASM once and then caches it in the browser. STEP tessellation is set to linearDeflection: 0.4, angularDeflection: 0.2 (≈480k triangles for the ignis battery module; tuned for mobile).

Requirements

• The 3d model viewer script must be wired: ~shareHtml → 3d model viewer (inheritable) on the blog root, shareHtmlLocation=body:end.
• The five libraries must exist as notes and be referenced by the script via the placeholder tokens in scripts/3d_model_viewer.js: __THREE_ID__, __THREE_ORBIT_ID__, __THREE_STL_ID__, __OCCT_JS_ID__ (the occt-wasm bundle), __OCCT_WASM_ID__ (occt-wasm.wasm) – see the README installation for the note titles. The STEP worker is a module worker (type: "module"), so the browser must support ES modules in workers (all modern browsers).
• Mobile compatibility: the mesh is split into chunks of ≤65000 vertices (chunkGeometry, Uint16 indices) so it renders on GPUs without OES_element_index_uint; the camera near/far is tightened after fit() for 16-bit depth buffers. The caption always shows a small debug line with the current step (loading / parsing / done / error) – useful while diagnosing.
• For inline embedding from a file note (Option C) the blog_data note must be present and the target model must be a published article (the viewer resolves ./<alias> links against window.blogData).

Trilium app widget (independent of the share)

The same viewer is also available inside Trilium itself (independent of the blog): a note-detail-pane widget (app/3d-model-viewer-app.jsx + app/3d-worker.js) renders the viewer whenever you open a file note whose title ends in .step / .stp / .stl. The worker is loaded from a code note (not a Blob) so it works under the app's CSP. Wire it by giving the JSX note the label #widget=3dModelViewer and reload the app.