/**
 * Keeps the ground window (viewer `lib/ground-window`) matched to the eye: a few throttled
 * CPU sight lines decide whether sculpted ground stands between the camera and the shown
 * box at all — that word opens the window (`Ground: Auto` permitting) and is what the view
 * bar reports — while the window's shape is drawn per fragment in TSL. Re-asked when the
 * eye moves, the scene or the box changes, or the person flips the ground mode.
 */
export declare function GroundWindowSystem(): null;
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