Infinite Shape Equivalent for the Field System?

Hi,

I’m trying to follow this tutorial.
The provided file here works as expected but I was thinking how it works with the new field system.

The scene ultimate breaks through the infinite shape fall off.
You can see an illustration here:
https://www.dropbox.com/s/neqz37unryhyp2x/c4d172_infinite_shape_equivalent_for_fields.jpg?dl=0

I understand it can be done with the native effectors but the essence of the tutorial is getting around with the Python Mograph API.  In addition, the problem above is not the Python Mograph API, its the fields part which I can’t find an equivalent.

Thank you for looking at my problem