Checkpoint web parity through Chromium input tasks

tools/web/check-ply-web-roundtrip.py

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+"""Import a browser-produced PLY in pinned Blender 5.2 and emit mapped fields."""
+
+import hashlib
+import json
+import sys
+from pathlib import Path
+
+import bpy
+
+
+def sha256_file(path):
+    digest = hashlib.sha256()
+    with open(path, "rb") as handle:
+        for chunk in iter(lambda: handle.read(1024 * 1024), b""):
+            digest.update(chunk)
+    return digest.hexdigest()
+
+
+def attr_values(attribute):
+    values = []
+    for item in attribute.data:
+        if attribute.data_type == "FLOAT_COLOR": values.append([float(value) for value in item.color])
+        elif attribute.data_type == "FLOAT_VECTOR": values.append([float(value) for value in item.vector])
+        elif attribute.data_type == "FLOAT": values.append(float(item.value))
+        elif attribute.data_type == "INT": values.append(int(item.value))
+    return values
+
+
+def main(ply_path, report_path):
+    ply_path = Path(ply_path).resolve(); report_path = Path(report_path).resolve()
+    bpy.ops.wm.read_factory_settings(use_empty=True)
+    result = bpy.ops.wm.ply_import(filepath=str(ply_path), import_colors="SRGB", import_attributes=True, forward_axis="NEGATIVE_Z", up_axis="Y", global_scale=1.0)
+    objects = [obj for obj in bpy.context.scene.objects if obj.type == "MESH"]
+    if "FINISHED" not in result or not objects: raise RuntimeError("Blender PLY import did not produce a mesh")
+    obj = objects[0]; mesh = obj.data; mesh.calc_loop_triangles()
+    wanted = [attribute for attribute in mesh.attributes if attribute.name in {"Col", "temperature", "label"}]
+    report = {
+        "schemaVersion": 1,
+        "operation": "DESKTOP_IMPORT_WEB_PLY",
+        "sourceSha256": sha256_file(ply_path),
+        "sourceBytes": ply_path.stat().st_size,
+        "objectCount": len(objects),
+        "vertexCount": len(mesh.vertices),
+        "polygonCount": len(mesh.polygons),
+        "triangleCount": len(mesh.loop_triangles),
+        "positions": [[float(value) for value in vertex.co] for vertex in mesh.vertices],
+        "attributes": [{"name": attribute.name, "dataType": attribute.data_type, "domain": attribute.domain, "values": attr_values(attribute)} for attribute in wanted],
+    }
+    report_path.parent.mkdir(parents=True, exist_ok=True); report_path.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
+    print("ply-web-roundtrip-desktop-imported vertices=%s faces=%s attrs=%s" % (report["vertexCount"], report["triangleCount"], len(report["attributes"])))
+
+
+if __name__ == "__main__":
+    args = sys.argv[sys.argv.index("--") + 1 :] if "--" in sys.argv else []
+    if len(args) != 2: raise SystemExit("usage: blender --background --python check-ply-web-roundtrip.py -- PLY REPORT")
+    main(args[0], args[1])