import { CacheOptions, ContextManager, Event, Observable, Stream } from '@zcomponent/core';
import * as THREE from 'three';
import { Object3D } from '../Object3D';
interface GLTFConstructorProps {
    /** @zprop
     * @zvalues files *.+(glb|gltf)
     */
    source: string;
    /**
     * @zprop
     * @zdefault false
     */
    frustumCulled?: boolean;
    /**
     * If true, this component will store the downloaded GLTF model in IndexedDB, with a key held in session storage
     * to allow rapid reloading without relying on the browser cache.
     * @zignore
     */
    sessionCache?: boolean;
    /**
     * Provides options for caching the downloaded GLTF model in page load, session or persistent storage.
     * @zignore
     */
    cache?: CacheOptions;
}
/**
 * Loads a 3D model of the GLTF format (.glb or .gltf).
 *
 * Supports Draco compressed files.
 *
 * To override the materials of the model, place Material components as children of this component and set the `attachTo` property to the name of the material in the GLTF file.
 *
 * Other components can be attached to the model by using the `AttachmentPoint` component. Add `AttachmentPoint` components as children of this component and set the `attachTo` property to the name of the node in the GLTF file.
 *
 * Root element: [THREE.Group](https://threejs.org/docs/index.html?q=Grou#api/en/objects/Group)
 *
 * @zcomponent
 * @zgroup 3D Models
 * @zicon deployed_code
 * @ztag three/Object3D/GLTF
 * @ztag three/Object3D/AttachmentSource/GLTF
 * @ztag three/MaterialHost/GLTF
 * @zparents three/Object3D/Group/**
 */
export declare class GLTF extends Object3D {
    protected constructorProps: GLTFConstructorProps;
    onAnimationUpdate: Event<[]>;
    loaded: Promise<void>;
    private _gltf;
    private _meshes;
    morphTargetMeshes: Observable<Map<string, Set<THREE.Mesh<THREE.BufferGeometry, THREE.Material | THREE.Material[]>>>, never>;
    mixer: Observable<THREE.AnimationMixer | undefined, never>;
    animationClips: Observable<Map<string, THREE.AnimationClip>, never>;
    nodesByName: Observable<Map<string, THREE.Object3D<any>>, never>;
    materials: Observable<Map<string, Set<THREE.Material>>, never>;
    private _defaultMaterialsByMesh;
    /**
     * @zstreams animations
     */
    streams: {
        [id: string]: Stream;
    };
    constructor(contextManager: ContextManager, constructorProps: GLTFConstructorProps);
    private _updateAttachments;
    private _updateAttachmentPoints;
    private _load;
    /**
     * @zprop
     * @zgroup Appearance
     * @zgrouppriority 11
     * @zdefault true
     */
    castShadow: Observable<boolean, never>;
    /**
     * @zprop
     * @zgroup Appearance
     * @zgrouppriority 11
     * @zdefault true
     */
    receiveShadow: Observable<boolean, never>;
    dispose(): never;
    private _updateFrame;
}
export {};