OptionalclippingAn existing scene ClippingController to drive (preferred when the app already has one).
OptionallayersConvenience: 3D layers to clip — a controller is created over them when clipping is omitted.
The MapLibre map (hosts the plane visual; repaints on change).
OptionalplaneInitial slice-volume size in metres (default 300): the half-WIDTH either side of the plane;
the cut DEPTH behind it is twice this. Resize live with the widget's edge handles or a
setSize action.
OptionalshowShow the semi-transparent plane visual (default true).
Configuration for createSliceController.