import { Loader } from 'three/webgpu';
import { Model, type Viewer, BaseGroup } from 'u-space';
import { SceneInstancedLayer } from './SceneInstancedLayer';
import { SceneEditableBatchLayer, type SceneEditableBatchOptions } from './SceneEditableBatchLayer';
import type { ITreeData } from '../types';
export declare class SceneGroup extends BaseGroup {
    isSceneGroup: boolean;
    type: string;
    sceneLayer: SceneInstancedLayer | SceneEditableBatchLayer | null;
    constructor();
    setSceneLayer(layer: SceneInstancedLayer | SceneEditableBatchLayer | null): this;
    getDefaultSceneLayer(): SceneInstancedLayer | SceneEditableBatchLayer | null;
}
export declare class SceneLoader extends Loader {
    #private;
    viewer: Viewer;
    key: string;
    cachedIds: Set<string>;
    editableBatchOptions: SceneEditableBatchOptions | null;
    protected _resourceData: any;
    protected _treeData: ITreeData[];
    constructor(viewer: Viewer);
    setKey(key: string): this;
    /**
     * Merge mostly-static scene models into editable GPU batches. Logical scene
     * objects remain addressable; transform or opacity edits materialize only the
     * edited object back into an ordinary model.
     */
    setEditableBatching(options?: boolean | SceneEditableBatchOptions): this;
    protected loadModel(url: string): Promise<Model>;
    protected _preareTreeData(): Promise<void>;
    protected _prepareSemanticIds(): Promise<ReadonlySet<string>>;
    /**
     * 加载场景
     * @param options
     * @returns
     */
    loadAsync(): Promise<SceneGroup>;
    clearCache(): void;
    dispose(): void;
}