import * as THREE from "three";
export declare function fullScreenListenner(container: HTMLDivElement | HTMLCanvasElement): void;
export declare function isIOS(): boolean;
export declare function traverseMaterials(object: THREE.Group, callback: (material: any) => void): void;
export declare function loading(loadingGif?: string): {
    loadingContainer: HTMLDivElement;
    progress: HTMLDivElement;
};
export declare function switchPencilIcon(icon: string, urls?: string[]): string;
export declare function throttle(callback: (event: MouseEvent) => void, wait: number): (event: MouseEvent) => void;
/**
 * Cubic-Lagrange basis function
 * @param x
 * @returns
 */
export declare function L3(x: number): number[];
/**
 * Cubic-Hermite basis function.
 * @param x
 * @returns
 */
export declare function H3(x: number): number[];
/**
 * To calculate the weights for each element of Xi using the cubic Lagrange basis functions.
 * @param Xi
 * @returns
 */
export declare function getWightsL3L3L3(Xi: number[]): number[];
export declare function getWightsH3H3H3(Xi: number[][]): number[][];
/**
 * Euclidean distance n dimensions
 * @param x0
 * @param x1
 * @returns
 */
export declare function calcDistance(x0: number[], x1: number[]): number;
export declare function perturbRandom(x: number[], dx: number): number[];