I have built two concentric hemispherical shells from two spheres centered at (x,y,z) = (0,0,0), and added a thickness to the outside shell to fill the gap between the two shells. However, I have found that -- despite the shells being of the same proportionality (height = 1/2 diameter) -- I do not get a perfect intersection of the inner wall of the green shell and the wall of the blue shell, as illustrated below.
Am I misinterpreting what I'm seeing? How can I make the inner wall of the thickened green shell exactly match the boundary of the (smaller) blue shell? Thank you in advance.