In time-dependent calculations, it is sometimes necessary to calculate the trajectory of material points. Ansys Polyflow is not a Lagrangian code (that is, it does not use a description and formulation following the particles), and nodes do not correspond, in general, to material particles. Therefore, a postprocessor is provided to track these material points. Typically this is useful in blow molding simulations, when remeshing is not of the Lagrangian type, although it can be very useful in many other situations also.