502eefdec2
trimesh's 3MF loader re-reads a whole production-extension part file for every component that points into it. A Bambu Studio project with 884 components across four ~50 MB part files grew past 3 GB within seconds and failed both the preview conversion and the geometry fingerprint. - Add tools/threemf_stream.py: parses each part once with lxml iterparse, resolves each component to the single object it names, and returns each mesh once plus its placements. The same project now converts in ~8 s at ~380 MB peak (fingerprinting ~190 MB). - convert_3mf.py and fingerprint.py use it; the GLB stores each object once and instances repeats. Stats are computed per placement (mirrored placements keep a positive volume), without concatenating meshes. - Run sidecar scripts through one queue (lib/python.js) so a preview and background fingerprinting never load big meshes at the same time; previews go first, and 3MFs are fingerprinted one per run. - Surface the converter's JSON error / timeout instead of "Command failed". - Tests with a Bambu-style component fixture (shared part, mirrored placement, decoy object) and STL/3MF fingerprint parity. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
22 lines
941 B
JavaScript
22 lines
941 B
JavaScript
// Converts 3MF files to GLB via the Python/trimesh sidecar, so the browser can
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// render Bambu/MakerWorld production-extension 3MFs (which the JS 3MFLoader can't).
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const { runScript } = require('./python');
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// Returns { glb, volume_cm3, bbox, faces } or throws.
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async function convert3mfToGlb(inputPath, outputPath) {
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const { err, stdout, stderr } = await runScript('convert_3mf.py', [inputPath, outputPath], { timeout: 120000 });
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let result = null;
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try {
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result = JSON.parse(stdout.trim().split('\n').pop());
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} catch { /* handled below */ }
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if (result && result.error) throw new Error(result.error);
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if (err) {
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if (err.killed) throw new Error('Timed out converting this 3MF for preview.');
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throw new Error(stderr ? stderr.trim().split('\n').slice(-3).join(' ') : err.message);
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}
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if (!result) throw new Error('Converter returned unparseable output.');
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return result;
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}
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module.exports = { convert3mfToGlb };
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