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>
49 lines
1.3 KiB
Python
49 lines
1.3 KiB
Python
#!/usr/bin/env python3
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"""Measure mesh files for geometry fingerprints (duplicate detection).
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Usage: fingerprint.py <file> [<file> ...]
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Prints one JSON line per file: {path, fp: {faces, area, volume, extents}} or {path, error}.
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Multi-object files (e.g. 3MF projects) are measured as one combined mesh.
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"""
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import sys
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import json
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import trimesh
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import threemf_stream
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def measure(path):
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if path.lower().endswith(".3mf"):
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stats = threemf_stream.measure(*threemf_stream.load(path))
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if not stats["faces"]:
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raise ValueError("no geometry found")
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return stats
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mesh = trimesh.load(path, force="mesh")
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if mesh is None or len(mesh.faces) == 0:
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raise ValueError("no geometry found")
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try:
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volume = abs(float(mesh.volume))
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except Exception:
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volume = 0.0
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return {
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"faces": int(len(mesh.faces)),
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"area": float(mesh.area),
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"volume": volume,
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"extents": [float(x) for x in mesh.extents],
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}
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def main():
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for path in sys.argv[1:]:
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try:
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out = {"path": path, "fp": measure(path)}
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except Exception as exc:
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out = {"path": path, "error": str(exc)[:200]}
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print(json.dumps(out), flush=True)
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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