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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.

enter image description here 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.

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  • $\begingroup$ Its not a good idea to have two different visible surfaces (faces) in the same exact position. The results are not acceptable to most people. $\endgroup$
    – atomicbezierslinger
    Sep 14 '15 at 15:37
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You can join the two meshes in object mode. Then in edit mode you you can select the two edge and perform a Bridge Edge Loop. That will also serve as a check to make sure you have the same number of vertices.

If you want two separate objects. You could start with one hemisphere, [solidify modifier], apply the modifier, The select the inner portion and menu [separate] to form two separate meshes.

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  • $\begingroup$ Thank you! Your last suggestion is exactly what I was looking for. $\endgroup$
    – AaronJPung
    Sep 14 '15 at 16:01

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