/**
 * @fileOverview
 * Defines various geometry related helper functions
 */
/**
 * computes centroid given a set of points
 * @param points
 * @returns centroid of 'points'
 */
export declare function getCentroid(points: number[][]): number[];
/**
 * Matrix denotes the basis vectors of the linear space. The orientation of the
 * basis vector should not change after rotating. So after computing rotation
 * matrix, we should check if the orientation is the same as before. Sign of
 * determinant of the matrix gives the orientation of the basis vectors.
 * Therefore, if the sign of the determinant is negative, we multiply the third
 * column of rotation matrix by -1, so that the orientation changes and sign of
 * determinant becomes positive again.
 * @param rotationalMatrix
 * @returns 3x3 matrix
 */
export declare function checkOrientation(rotationalMatrix: number[][]): number[][];