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>
42 lines
1.3 KiB
JavaScript
42 lines
1.3 KiB
JavaScript
// Runs the Python/trimesh sidecar scripts one at a time. Loading a large mesh
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// can take hundreds of MB, so a preview conversion and background
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// fingerprinting never run at once. Jobs someone is waiting on (previews) go
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// ahead of queued background work.
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const path = require('path');
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const { execFile } = require('child_process');
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const PYTHON = process.env.PYTHON_BIN || path.join(__dirname, '..', 'tools', 'venv', 'bin', 'python');
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const TOOLS = path.join(__dirname, '..', 'tools');
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const urgent = [];
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const background = [];
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let busy = false;
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// Resolves { err, stdout, stderr } — never rejects, so callers can use partial
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// output from a run that failed part-way.
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function runScript(script, args, { timeout = 120000, isBackground = false } = {}) {
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return new Promise((resolve) => {
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(isBackground ? background : urgent).push({ script, args, timeout, resolve });
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next();
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});
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}
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function next() {
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if (busy) return;
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const job = urgent.shift() || background.shift();
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if (!job) return;
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busy = true;
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execFile(
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PYTHON,
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[path.join(TOOLS, job.script), ...job.args],
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{ maxBuffer: 16 * 1024 * 1024, timeout: job.timeout },
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(err, stdout, stderr) => {
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busy = false;
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job.resolve({ err, stdout: String(stdout || ''), stderr: String(stderr || '') });
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next();
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}
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);
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}
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module.exports = { PYTHON, runScript };
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