code: public Quaternionf toQuaternion(float x, float y, float z) {
          return Quaternionf.fromAngleRadAxis(getAngleRad(), x, y, z);
      }
docs: Converts this complex to a quaternion by
  using the provided float components vector
  as a rotation axis.
  
  @param x The x component of the axis vector
  @param y The y component of the axis vector
  @param z The z component of the axis vector
  @return A quaternion of this rotation around the given axis