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SimpleCADAPI-master/examples/19_four_planet_planetary_reducer/main.py

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+"""Build, solve, and export the four-planet planetary reducer gearset."""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+import simplecadapi as scad
+
+from assembly import make_four_planet_planetary_reducer_rassembly
+
+
+OUT_DIR = Path("examples/out/19_four_planet_planetary_reducer")
+
+
+def _build_four_planet_reducer():
+    with scad.GraphSession(graph_id="four_planet_planetary_reducer") as session:
+        assembly = make_four_planet_planetary_reducer_rassembly()
+        preview = scad.make_compound_from_assembly_rcompound(assembly=assembly)
+        session_json = scad.export_session_json(session=session)
+        model_json = scad.export_model_json(session=session)
+    return assembly, preview, model_json, session_json
+
+
+def main() -> None:
+    OUT_DIR.mkdir(parents=True, exist_ok=True)
+    model_path = OUT_DIR / "four_planet_planetary_reducer.model.json"
+    session_path = OUT_DIR / "four_planet_planetary_reducer.session.json"
+    step_path = OUT_DIR / "four_planet_planetary_reducer.step"
+    fcstd_path = OUT_DIR / "four_planet_planetary_reducer.FCStd"
+    if fcstd_path.exists():
+        fcstd_path.unlink()
+
+    assembly, preview, model_json, session_json = _build_four_planet_reducer()
+    model_path.write_text(model_json, encoding="utf-8")
+    session_path.write_text(session_json, encoding="utf-8")
+    scad.export_step(shapes=preview, filename=str(step_path))
+
+    imported = scad.import_model_json(json_str=model_json)
+    replayed = scad.replay_model_json(json_str=model_json)
+    payload = json.loads(model_json)
+
+    fcstd_status = "not attempted"
+    try:
+        scad.translator.freecad_translator.translate_model_json_to_fcstd(
+            json_str=model_json,
+            output_path=str(fcstd_path.resolve()),
+            document_name="FourPlanetPlanetaryReducer",
+            freecad_cmd=None,
+        )
+        fcstd_status = f"{fcstd_path} ({fcstd_path.stat().st_size} bytes)"
+    except Exception as exc:  # pragma: no cover - depends on local FreeCAD install
+        fcstd_status = f"skipped ({exc.__class__.__name__}: {exc})"
+
+    print(f"assembly={assembly.assembly_id}")
+    print("components=" + ",".join(assembly.component_ids()))
+    print("constraints=" + ",".join(assembly.constraint_ids()))
+    print(f"preview_solids={len(preview.get_solids())}")
+    print(f"preview_volume={preview.get_volume():.3f}")
+    print(f"imported_keys={','.join(sorted(imported.keys()))}")
+    print(f"replay_outputs={len(replayed)}")
+    print("replay_types=" + ",".join(type(item).__name__ for item in replayed))
+    print(f"graph_nodes={len(payload['graph']['nodes'])}")
+    print(f"model={model_path}")
+    print(f"session={session_path}")
+    print(f"step={step_path}")
+    print(f"fcstd={fcstd_status}")
+
+
+if __name__ == "__main__":
+    main()