import * as THREE from "three";
/**
 * Studio floor — shadow-catching ground plane for Studio mode.
 *
 * Uses ShadowMaterial which is fully transparent except where shadows
 * are cast, providing a natural grounding effect without obscuring
 * the background (like KeyShot's Ground material or Fusion 360's
 * ground plane).
 *
 * The floor is added to the scene via its `group` property.
 * Shadow plane visibility is toggled via `setShadowsEnabled()`.
 */
declare class StudioFloor {
    /** The Group to add to the scene. Contains the shadow plane. */
    readonly group: THREE.Group;
    /** Shadow-receiving plane (ShadowMaterial) */
    private _shadowPlane;
    /** Whether shadows are currently enabled */
    private _shadowsEnabled;
    constructor();
    /**
     * Create or recreate the floor for the given scene bounds.
     *
     * Call this when the bounding box changes (new shapes loaded).
     *
     * @param zPosition - Z coordinate for the floor (typically bbox.min.z)
     * @param sceneSize - Approximate scene size (max extent) for sizing the floor
     */
    configure(zPosition: number, sceneSize: number): void;
    /**
     * Toggle shadow plane visibility.
     *
     * @param enabled - Whether to show the shadow plane
     */
    setShadowsEnabled(enabled: boolean): void;
    /**
     * Set the ground shadow opacity (how dark the shadow appears on the floor).
     * This supplements `light.shadow.intensity` which controls shadow darkness
     * on lit materials; the ground plane ShadowMaterial needs its own opacity.
     *
     * @param intensity - Shadow intensity 0-1
     */
    setShadowIntensity(intensity: number): void;
    /** Dispose all GPU resources. */
    dispose(): void;
    /**
     * Create a shadow-receiving plane at the floor position.
     */
    private _createShadowPlane;
    /** Remove and dispose the current shadow plane. */
    private _clearCurrent;
}
export { StudioFloor };