All, I am new on this list and testing the functionality of the library. The purpose of the python script attached is to visualize the output of SPH simulations. There seems to be a special interpolation type for SPH to mesh interpolation, but how should the script be modified to allow this to be done in the function yt_plot ? A second question is if it is possible to add magnetic fields for SPH particle data, so that magnetic field directions, magnetic field strength etc. can be visualized. dr. Siegfried Vanaverbeke