/**
 * LODStreamer.ts
 *
 * Distance-based LOD streaming: load/unload queues,
 * budget management, priority ordering, and hysteresis.
 *
 * @module lod
 */
export interface StreamableAsset {
    id: string;
    /** World-space position of the asset for distance-based LOD selection. */
    position: [number, number, number];
    lodLevels: number[];
    currentLOD: number;
    priority: number;
    memoryCost: number[];
}
export interface StreamRequest {
    assetId: string;
    targetLOD: number;
    type: 'load' | 'unload';
}
export declare class LODStreamer {
    private assets;
    private loadQueue;
    private unloadQueue;
    private memoryBudget;
    private memoryUsed;
    private hysteresis;
    constructor(memoryBudget: number);
    registerAsset(asset: StreamableAsset): void;
    update(cameraX: number, cameraY: number, cameraZ: number): void;
    evaluateDistance(assetId: string, distance: number): number;
    private selectLOD;
    processQueue(maxItems?: number): StreamRequest[];
    getMemoryUsed(): number;
    getMemoryBudget(): number;
    getLoadQueueSize(): number;
    getUnloadQueueSize(): number;
    getCurrentLOD(id: string): number;
}
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