import { THREE, BaseViewer, Plugin, PluginConfig } from "@x-viewer/core";
/**
 * Ground grid plugin.
 */
export interface GroundGridPluginConfig extends Partial<PluginConfig> {
    /** If ground grid is visible. It is visible by default. */
    visible?: boolean;
    /** World-space Y height of the grid plane. Default 0. */
    height?: number;
}
/**
 * Infinite anti-aliased ground grid rendered on a horizontal plane at configurable world Y.
 * Uses a shader-based approach (Fyrestar/THREE.InfiniteGridHelper technique)
 * so the grid always follows the camera and fades with distance.
 * Can be used by Viewer3d.
 */
export declare class GroundGridPlugin extends Plugin {
    static readonly DEFAULT_ID = "GroundGridPlugin";
    protected readonly NAME = "GROUND_GRID";
    protected cfg: GroundGridPluginConfig;
    protected gridMesh?: THREE.Mesh;
    constructor(viewer: BaseViewer, cfg?: GroundGridPluginConfig);
    protected init(): void;
    /** World-space Y of the grid plane. */
    getHeight(): number;
    setHeight(height: number): void;
    protected applyGridHeight(): void;
    setVisible(visible: boolean): void;
    isVisible(): boolean;
    protected onModelLoaded: () => void;
    /**
     * Creates an infinite grid mesh using a shader-based approach.
     * A unit PlaneGeometry is scaled in the vertex shader to fill the visible
     * area, always centred on the camera, so no finite boundary is ever visible.
     */
    protected createInfiniteGrid(): THREE.Mesh;
    destroy(): void;
}