/**
 * Billboard
 *
 * A 2D billboard element that always faces the camera.
 * Used for sprites, UI elements, and always-visible markers.
 */
import { OutlinerElement, OutlinerElementData } from './outliner_element';
import { BillboardFace, BillboardFaceData } from './billboard_face';
import { Vector3 } from '../modeling/transform';
export interface BillboardData extends OutlinerElementData {
    position?: Vector3;
    size?: [number, number];
    offset?: [number, number];
    color?: number;
    visibility?: boolean;
    shade?: boolean;
    autouv?: number;
    facing_mode?: 'lookat' | 'lookat_y' | 'rotate' | 'rotate_y';
    faces?: {
        front?: BillboardFaceData;
    };
}
export declare class Billboard extends OutlinerElement {
    position: Vector3;
    size: [number, number];
    offset: [number, number];
    color: number;
    shade: boolean;
    autouv: number;
    facing_mode: 'lookat' | 'lookat_y' | 'rotate' | 'rotate_y';
    private _faces;
    constructor(data?: BillboardData, uuid?: string);
    get origin(): Vector3;
    get faces(): {
        front: BillboardFace;
    };
    extend(object: BillboardData): this;
    getUndoCopy(aspects?: number): BillboardData;
    getSaveCopy(): BillboardData;
    /**
     * Flip billboard along axis
     */
    flip(axis: 0 | 1 | 2): this;
    /**
     * Get world center position
     * Framework adapters should override this for their coordinate system
     */
    getWorldCenter(): Vector3;
    /**
     * Set color index
     */
    setColor(index: number): this;
    /**
     * Apply texture to billboard
     */
    applyTexture(texture: any): void;
    /**
     * Move billboard by vector
     */
    moveVector(arr: Vector3 | number, axis?: number, update?: boolean): this;
    /**
     * Resize billboard
     */
    resize(val: number | ((n: number) => number), axis: 0 | 1, negative?: boolean): this;
    /**
     * Map auto UV based on size
     * Framework adapters should override this for texture size handling
     */
    mapAutoUV(): void;
    static behavior: {
        select_faces: boolean;
        cube_faces: boolean;
        movable: boolean;
        resizable: boolean;
        unique_name: boolean;
    };
}
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