import { IFragment } from "./base-types";
/**
 * Contains the logic to get, create and delete geometric subsets of an IFC model. For example,
 * this can extract all the items in a specific IfcBuildingStorey and create a new Mesh.
 */
export declare class Blocks {
    private fragment;
    readonly ids: Set<number>;
    readonly visibleIds: Set<number>;
    get count(): number;
    private blocksMap;
    private tempIndex;
    constructor(fragment: IFragment);
    reset(): void;
    add(ids: number[], removePrevious?: boolean): void;
    remove(ids: number[]): void;
    dispose(): void;
    private initializeSubsetGroups;
    private filterIndices;
    private constructSubsetByMaterial;
    private insertNewIndices;
    private insertIndicesAtGroup;
    private getCurrentGroup;
    private resetGroups;
    private getAllIndicesOfGroup;
    private getIndexChunk;
}