from pathlib import Path
import FreeCAD as App, FreeCADGui as Gui
import os, traceback
R=Path(r'C:\projects\wheel')
out=R/'models'/'washer_panel_4x4'
try:
    p=next(out.glob('*.FCStd'))
    doc=App.openDocument(str(p));doc.recompute()
    for obj in doc.Objects:
        if obj.ViewObject: obj.ViewObject.Visibility=False
    panel=doc.getObject('WasherPanel');panel.ViewObject.Visibility=True
    panel.ViewObject.ShapeColor=(0.65,0.74,0.86)
    Gui.activeDocument().activeView().viewAxonometric();Gui.activeDocument().activeView().fitAll()
    doc.recompute();doc.save()
    App.closeDocument(doc.Name)
    (out/'gui_ready.txt').write_text('OK',encoding='utf-8')
    os._exit(0)
except Exception:
    (out/'gui_error.txt').write_text(traceback.format_exc(),encoding='utf-8')
    os._exit(1)