code: private Vector3d getNonColinearVector(Vector3d ab) {
          Vector3d cr = new Vector3d();
          cr.cross(ab, XV);
          if (cr.length() > 0.00001) {
              return XV;
          } else {
              return YV;
          }
      }
docs: Gets the nonColinearVector attribute of the AtomLigandPlacer3D class
  
  @param  ab  Description of the Parameter
  @return     The nonColinearVector value