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Yes, this is the same poster. I am very surprised by the fact that nobody has suggested an answer on either forum. Perplexed even!

I have a 3-dimensional compound figure that I would like to create using TikZ. The figure is in the form of a cube sitting inside a sphere, within which is exactly fits, that is, s, the side length of the cube is given by

s = 2*r/sqrt(3), where r is the radius of the sphere.

I would like to ...