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matthewtrahan
2aa86a4b70
The pen holder (195 KB SolidWorks STEP) tessellates in 0.3 s; the rest of a 1.7-3.4 s cold import was the ~2.9 MB kernel download. Start the worker when Import is clicked or a file is dragged over, so the download overlaps with the file dialog. The vendor folder now carries the version (occt-import-js-0.0.23) and web/_headers marks it immutable for a year. A failed read drops the worker so the next attempt starts clean.
34 lines
1.3 KiB
JavaScript
34 lines
1.3 KiB
JavaScript
/**
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* STEP tessellation worker (classic, not a module: the OpenCascade build is an
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* Emscripten script loaded with importScripts). Receives { bytes, params },
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* returns the kernel's result with typed arrays transferred back rather than
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* cloning big plain arrays. A { warm: true } message only loads the kernel, so
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* the download can start while the user is still picking a file. See step.js.
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*
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* The vendor folder carries the version so it can be cached for a year
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* (web/_headers): bumping the version is what busts the cache.
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*/
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const OCCT = './vendor/occt-import-js-0.0.23/';
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importScripts(`${OCCT}occt-import-js.js`);
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const kernel = occtimportjs({ locateFile: (f) => `${OCCT}${f}` });
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onmessage = async (e) => {
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try {
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const occt = await kernel;
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if (e.data.warm) return;
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const r = occt.ReadStepFile(e.data.bytes, e.data.params);
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const transfer = [];
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for (const m of r.meshes ?? []) {
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m.attributes.position.array = new Float32Array(m.attributes.position.array);
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m.index.array = new Uint32Array(m.index.array);
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delete m.attributes.normal; // the app computes its own
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delete m.brep_faces;
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transfer.push(m.attributes.position.array.buffer, m.index.array.buffer);
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}
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postMessage(r, transfer);
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} catch (err) {
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if (!e.data.warm) postMessage({ error: String(err?.message ?? err) });
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}
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};
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