/*!
 * Copyright (c) Microsoft Corporation.
 * Licensed under the MIT License.
 */
import { vec2, vec3 } from "gl-matrix";
export declare class AngleHelper {
    private static _vec3;
    static degreesToRadians(degrees: number): number;
    static radiansToDegrees(radians: number): number;
    static wrapAngle(angle: number): number;
    static sphericalToCartesian(altitude: number, longitude: number, latitude: number, result: vec3): void;
    static cartesianToSpherical(x: number, y: number, z: number, result: vec2): void;
    static angleBetweenVectors(from: vec3, to: vec3): number;
    static signedAngleBetweenVectors(from: vec3, to: vec3, up: vec3): number;
}