Using python ifm extension to export the Zero isosurface from a Flow Model

Hello, Guys from DHI I have a question.
How FEFLOW GUI calculates on a 3D view the  Zero isosurface from the Fluid Flow Pressure? It's by interpolating the closest negative and positive node near zero [kPa]?
I have tried to replicate the result from the GUI exports using the ifm getResultsFlowPressureValue(node) and filtering the nodes closest to Zero but seems that the export from FEFLOW  gets some points around that node and I don't know what that point means or how to add them.
The image below has the red points from the FEFLOW export and in blue the nodes filtered by ifm.

Hello Tiago,
I also have interest on this topic. A couple months ago I was working on something similar and found the same problem as you.