By Henryk Szubinski
this is a 3 D surface for shure
but the force field that is known of as enveloping a object is surround by all vector approaches
This does not
it is a
Plot of a two-dimensional slice of the gravitational potential in and around a uniform spherical body. The inflection points of the cross-section are at the surface of the body.
the developments of force fields has problems related to the total envelopements as the developement basis beyond it by my work above
the image below is courtesy of Wikipedia