code: public Vector3d positiveX(Vector3d dir) {
          dir.x = m11 * m22 - m12 * m21;
          dir.y = m02 * m21 - m01 * m22;
          dir.z = m01 * m12 - m02 * m11;
          return dir.normalize(dir);
      }
docs: /* (non-Javadoc)
  @see org.joml.Matrix3dc#positiveX(org.joml.Vector3d)