SOLVED Formula Effector Spherical Effect U and V Interpretation

I'm struggling to understand exactly what U and V are in the Formula Effector. The documentation states:

d(uvxyzt)

This is where you enter the formula for all effects apart from Manual. u and v are parameters that run from 0 to 1 along the horizontal and vertical axes respectively.

But this definition doesn't make it clear how that's different than the y or x axis. If I apply a formula effector to a sphere, here are some results I get:

When I just use "U" in the formula:
95412164-38c4-4cd9-9d78-c12a527f581b-image.png

When I just use "V" in the formula:
43b66306-015d-49d9-a48f-34c42df96d3b-image.png

I don't see the relationship between "the horizontal and vertical axes" in this case.

Does somebody have a more precise definition of what u and v represent, specifically in "spherical" mode? What do they range from (is it 0 to 1)?

Hello @johntravolski,

thank you for reaching out to us. Please note that the Forum Guidelines state that the scope of Plugin café support requests is "bound to the scope of Cinema 4D public API support". So, your question is unfortunately out of scope for this forum. Please contact user support for questions about Cinema 4D itself.

Thank you for your understanding,
Ferdinand