Hi @Kenichiro-Yoshimi, thanks for the help. I am trying to do a similar thing but I am still a beginner in Paraview. Is it possible for you to outline the steps to do this? Starting from loading the ParaView.foam file. I have tried to do it myself, somehow I get the interface curvature but I do not see the normal vertor as I see here in your image.
@mwestphal can you also help with the steps? I just need the steps and a short explanation. I can figure out the rest by myself.