public static Quaternion AverageQuaternion(this Quaternion q1, Quaternion q2) => CGMath.AverageQuaternion(q1, q2);
 public static Quaternion AverageQuaternion(this List <Quaternion> quaternions) => CGMath.AverageQuaternion(quaternions: quaternions);
 public static Quaternion AverageQuaternion(this Quaternion[] quaternions) => CGMath.AverageQuaternion(quaternions: quaternions);