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I have created three spheres (that together should make up the earth). I first created the inner sphere (the earth surface). Then I duplicated that and set the x,y,z scales at 1.012 (this sphere is for the clouds).

After that I created the third sphere (atmosphere) and set the scales at 1.017. No - a few weeks later - I have a look at the file and see that the x,y,z dimensions of these spheres are wrong. I expect the x,y,z dimensions to be the same for one sphere. How is this possible ?

By the way ... when I created these spheres I was doing this Blenderguru tutorial and as far as I know his dimensions were "perfect" for all three spheres.

The earth enter image description here

Cloud sphere enter image description here Atmosphere enter image description here

I am not that familiar with Apply Scale ... but should I have done that ? What could have happened ?

And is there a way to get the dimensions and scaling right (next to create the spheres from scratch) ?

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This is because it is not a perfect sphere, it is constructed of flat faces and it is not perfectly symmetrical. ( could have a vertex at the top and a flat face at the bottom), to get it close to the dimensions you want increase the resolution of the sphere (segments and rings ).

just consider a simple case of a circle since it is made of finite straight lines its dimension wouldn't be as expected depending on its resolution :

enter image description here

you can clearly see why X differ from Y for this circle.

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  • $\begingroup$ I guess when you apply a sub surf modifier it does not improve the symmetry of the sphere ? Can you "repair" the symmetry with a Cast Modifier ? $\endgroup$
    – user13877
    Commented Feb 16, 2016 at 17:59
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    $\begingroup$ @Jan not sure it would do , if you haven't done so much on the spheres just create one with a good number of rings and segments $\endgroup$
    – Chebhou
    Commented Feb 16, 2016 at 18:09

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