boolian operation of two files

Hi all,

It might be easy, but I did not succeed … I have two vtk files loaded. One is a 3D volume mesh, CFD data from openfoam. The second one is a Isosurface that I computed with matlab and exported that one into vtk. Both files are accepted by paraview without any errors.
But how can I use the isosurface to intersect it with the 3D mesh from openfoam. I tried clipping using the scalar entry, however I can not access the data from the volume. Append data did also not help. Basically, I want a boolean operation of the openfoam mesh. Thank you sooo much for any help

Not easy and not trivial with ParaView I’m afraid.

ok thank you anyway