import { Vector3 } from 'three';

/**
 * Calculate the signed angle between two vectors. Only works when the vectors are on the same plane.
 * @param vecB Start Vector
 * @param vecA Target Vector
 * @param planeNormal The vector's plane normal
 * @returns Signed angle in radians
 */

export default function signedAngleTo(
    vecA: Vector3,
    vecB: Vector3,
    planeNormal: Vector3,
): number {
    return Math.atan2(
        vecA.clone().cross(vecB).dot(planeNormal),
        vecB.clone().dot(vecA),
    );
}