Hello,
I want to export the constant electric field lines in a .txt file. For that, I was thinking to create a 3D curve (2Dgrid) and then exporte this curve. I created this 2D grid that has 3 regions (image below left): Air, C: conductor and I: insulation, but I only want the data of the constant electic field lines of Air region (image below rigth).


However, when I tried to generate the 3D curve (as in the image below), I got this error message where it says that as there are points outside the selected region, it can not create the 3D curve (image below, error).


Is there any option to generate the 3D curve only in the region I want? Is there any other alternative to obtain the constant electric field lines in the air and export them in a .txt/.csv file?
Thank you in advanced!