/**
 * TerrainLOD.ts
 *
 * Quadtree-based terrain LOD: distance-based chunking,
 * seamless stitching, morph factors, and streaming.
 *
 * @module terrain
 */
export interface TerrainChunk {
    id: string;
    level: number;
    x: number;
    z: number;
    size: number;
    resolution: number;
    heightData: Float32Array;
    morphFactor: number;
    active: boolean;
    children: string[];
}
export interface TerrainLODConfig {
    totalSize: number;
    maxLOD: number;
    baseResolution: number;
    lodDistances: number[];
    morphRange: number;
}
export declare class TerrainLOD {
    private config;
    private chunks;
    private activeChunks;
    constructor(config?: Partial<TerrainLODConfig>);
    generateQuadtree(heightSampler: (x: number, z: number) => number): void;
    private subdivide;
    selectLOD(cameraX: number, cameraZ: number): void;
    getStitchEdges(chunkId: string): {
        north: boolean;
        south: boolean;
        east: boolean;
        west: boolean;
    };
    private overlapsX;
    private overlapsZ;
    getChunk(id: string): TerrainChunk | undefined;
    getActiveChunks(): TerrainChunk[];
    getActiveChunkCount(): number;
    getTotalChunkCount(): number;
    sampleHeight(x: number, z: number): number;
}
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