I have obtained the electric current **density** (flux density) from an Elmer 3D finite-element model. My objective is to calculate the current through a plane defined in the model. Here is what I tried:

- In Paraview, I opened the vtu results file from the 3D solution.
- Selected the current density data variable of interest from the vtu file.
- Defined a plane in the 3D model by applying the
**slice filter**to (2). - Applied the
**surface flow filter**to (3).

The problem is that the bounds for the surface integration, as shown in the **surface flow** output, on the defined plane has **zero range**. Explicitly selecting cells in the plane produced the same zero range.

Any help/suggestions/comments regarding calculation of flux through a surface would be greatly appreciated.