/**
 * BillboardFace
 *
 * Represents a single face of a Billboard element.
 * Billboards are 2D elements that always face the camera.
 */
import { CubeFace } from './cube_face';
import { Billboard } from './billboard';
import { Vector3 } from '../modeling/transform';
export interface BillboardFaceData {
    uv?: [number, number, number, number];
    texture?: string | false | null;
    rotation?: number;
}
export declare class BillboardFace extends CubeFace {
    billboard: Billboard;
    rotation: number;
    constructor(data: BillboardFaceData | null, billboard: Billboard);
    get uv_size(): [number, number];
    set uv_size(arr: [number, number]);
    extend(data: BillboardFaceData): this;
    getUndoCopy(): BillboardFaceData;
    reset(): this;
    getVertexIndices(): number[];
    /**
     * Convert UV point to local space coordinates
     * Framework adapters should override this for their coordinate system
     */
    UVToLocal(point: [number, number]): Vector3;
}
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