[Paraview] potential mapped on isosurface

[Stefan Ringe]

Hi!

I have datafiles of type:

x y z f(x,y,z)

so 4 columns with datapoints. The grid is not regular. Until now I load 
the files as VTK particle files and plotting works fine. Now I have two 
files, a density file (x y z rho(x,y,z)) and a potential file (x y z 
phi(x,y,z)). I want to plot a contour map of phi on an isodensity 
surface of rho. How can I do this?

thanks!

Stefan Ringe