/**
 * ImpostorSystem.ts
 *
 * Billboard impostors: capture snapshots, angle-based selection,
 * atlas packing, and distance threshold management.
 *
 * @module lod
 */
export interface ImpostorConfig {
    entityId: string;
    angleCount: number;
    atlasIndex: number;
    switchDistance: number;
    size: {
        width: number;
        height: number;
    };
}
export interface ImpostorFrame {
    angleIndex: number;
    uvX: number;
    uvY: number;
    uvW: number;
    uvH: number;
}
export declare class ImpostorSystem {
    private impostors;
    private atlasColumns;
    private atlasRows;
    constructor(atlasColumns?: number, atlasRows?: number);
    registerImpostor(config: ImpostorConfig): void;
    removeImpostor(entityId: string): void;
    selectAngle(entityId: string, cameraAngle: number): ImpostorFrame | null;
    private getFrame;
    shouldUseImpostor(entityId: string, distance: number): boolean;
    getImpostorCount(): number;
    getConfig(entityId: string): ImpostorConfig | undefined;
}
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