export declare const EARTH_RADIUS = 100;
export declare const EARTH_SEGMENTS = 36;
export declare const EARTH_RADIUS_OUTER = 40;
/**
 * 经纬度转xyz
 * @param longitude 经度
 * @param latitude 纬度
 * @param radius 半径
 */
export declare function lglt2xyz(lnglat: [number, number]): number[];
/**
 * 构建地球球体网格
 * @param radius
 * @param opt
 * @returns
 */
export declare function primitiveSphere(radius: number, opt: {
    segments: number;
}): {
    cells: number[][];
    positions: number[][];
    uvs: number[][];
    positionsArr: number[];
    indicesArr: number[];
    normalArr: number[];
};