59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
"""Import a browser-produced binary STL in pinned Blender 5.2."""
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import hashlib
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import json
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import sys
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from pathlib import Path
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import bpy
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def sha256_file(path):
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digest = hashlib.sha256()
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with open(path, "rb") as handle:
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for chunk in iter(lambda: handle.read(1024 * 1024), b""):
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digest.update(chunk)
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return digest.hexdigest()
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def main(stl_path, report_path):
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stl_path = Path(stl_path).resolve()
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report_path = Path(report_path).resolve()
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bpy.ops.wm.read_factory_settings(use_empty=True)
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result = bpy.ops.wm.stl_import(
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filepath=str(stl_path),
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directory=str(stl_path.parent),
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forward_axis="NEGATIVE_Z",
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up_axis="Y",
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global_scale=1.0,
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use_scene_unit=False,
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use_facet_normal=True,
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use_mesh_validate=True,
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)
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objects = [obj for obj in bpy.context.scene.objects if obj.type == "MESH"]
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if "FINISHED" not in result or not objects:
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raise RuntimeError("Blender Web STL import did not produce a mesh")
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mesh = objects[0].data
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mesh.calc_loop_triangles()
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report = {
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"schemaVersion": 1,
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"operation": "DESKTOP_IMPORT_WEB_STL",
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"sourceSha256": sha256_file(stl_path),
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"sourceBytes": stl_path.stat().st_size,
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"objectCount": len(objects),
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"vertexCount": len(mesh.vertices),
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"polygonCount": len(mesh.polygons),
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"triangleCount": len(mesh.loop_triangles),
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"polygonNormals": [[float(value) for value in polygon.normal] for polygon in mesh.polygons],
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}
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report_path.parent.mkdir(parents=True, exist_ok=True)
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report_path.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
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print("stl-web-roundtrip-desktop-imported triangles=%s" % report["triangleCount"])
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if __name__ == "__main__":
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args = sys.argv[sys.argv.index("--") + 1 :] if "--" in sys.argv else []
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if len(args) != 2:
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raise SystemExit("usage: blender --background --python check-stl-web-roundtrip.py -- STL REPORT")
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main(args[0], args[1])
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