def demo_shellFeatures_add(rootComp: adsk.fusion.Component): face = _ui.selectEntity('Select a face to open as part of a shell feature.', 'Faces').entity bodiesAndFaces = adsk.core.ObjectCollection.create() bodiesAndFaces.add(face) shellFeatures = rootComp.features.shellFeatures input: adsk.fusion.ShellFeatureInput = shellFeatures.createInput(bodiesAndFaces, True) input.insideThickness = adsk.core.ValueInput.createByReal(0.25) shellFeature = shellFeatures.add(input)