I’ve been looking at this all day.

it’s not floating point errors. what it is, is large countries, and the extrusion formula creates a triangle that crosses it in a large distance. such that it is below the sphere surface far enough, that after extrusion, it is still below the sphere.

and yea, kicking up depth fixes it, but i really dislike the depth I end up, because it is way too tall.

i have been wracking my brain on how to solve this, but i’ve been unsuccessful.

i dont know the best way to describe this, but what if I defined a set of points inside the polygon, so that instead of an outline, i have more of a “backing” if I can draw curves through the non-border points, i could make like a ribbon type shape or something, and extrude that?

while I can generate points, I don’t know how to order them in the plane. I’ve also had issues making ribbons, a 1 path ribbon doesn’t seem to work here. but maybe if I make a “filled in” curved plane, I can extrude that with math, and that gives me my 2nd ribbon path?

no idea if this makes sense.